Author: jsdelfino
Date: Tue Apr 10 23:26:26 2007
New Revision: 527397
URL: http://svn.apache.org/viewvc?view=rev&rev=527397
Log:
Ported WSDL interface introspector to the latest SPIs and integrated it with
the WSDLInterfaceProcessor.
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
(with props)
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
(with props)
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
(with props)
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
(with props)
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
(with props)
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
(with props)
Modified:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/xml/WSDLInterfaceProcessor.java
incubator/tuscany/java/sca/modules/interface-wsdl/pom.xml
incubator/tuscany/java/sca/modules/interface/src/main/java/org/apache/tuscany/interfacedef/util/WrapperInfo.java
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.wsdl.PortType;
+
+import org.apache.tuscany.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.interfacedef.Operation;
+import org.apache.tuscany.interfacedef.wsdl.WSDLInterface;
+import org.apache.tuscany.interfacedef.wsdl.impl.WSDLInterfaceImpl;
+
+/**
+ * Introspector for creating WSDLInterface definitions from WSDL PortTypes.
+ */
+public class DefaultWSDLInterfaceIntrospector implements
WSDLInterfaceIntrospector {
+
+ private XMLSchemaRegistry schemaRegistry;
+
+ public DefaultWSDLInterfaceIntrospector(XMLSchemaRegistry schemaRegistry) {
+ super();
+ this.schemaRegistry = schemaRegistry;
+ }
+
+ // FIXME: Do we want to deal with document-literal wrapped style based on
the JAX-WS spec?
+ protected List<Operation> introspectOperations(PortType portType) throws
InvalidInterfaceException {
+ List<Operation> operations = new ArrayList<Operation>();
+ for (Object op : portType.getOperations()) {
+ javax.wsdl.Operation wsdlOp = (javax.wsdl.Operation)op;
+ operations.add(introspectOperation(wsdlOp));
+ }
+ return operations;
+ }
+
+ protected Operation introspectOperation(javax.wsdl.Operation wsdlOp)
throws InvalidInterfaceException {
+
+ WSDLOperation op = new WSDLOperation(wsdlOp, null, schemaRegistry);
+ return op.getOperation();
+ }
+
+ public WSDLInterface introspect(PortType portType) throws
InvalidInterfaceException {
+ WSDLInterface wsdlInterface = new WSDLInterfaceImpl();
+ wsdlInterface.setPortType(portType);
+ wsdlInterface.getOperations().addAll(introspectOperations(portType));
+ // FIXME: set to Non-conversational for now
+ wsdlInterface.setConversational(false);
+ return wsdlInterface;
+ }
+
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultWSDLInterfaceIntrospector.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,127 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import javax.wsdl.Definition;
+import javax.wsdl.Types;
+import javax.wsdl.extensions.schema.Schema;
+import javax.xml.namespace.QName;
+
+import org.apache.ws.commons.schema.XmlSchema;
+import org.apache.ws.commons.schema.XmlSchemaCollection;
+import org.apache.ws.commons.schema.XmlSchemaElement;
+import org.apache.ws.commons.schema.XmlSchemaException;
+import org.apache.ws.commons.schema.XmlSchemaType;
+import org.w3c.dom.Element;
+
+/**
+ * Default implementation of XMLSchemaRegistry
+ */
+public class DefaultXMLSchemaRegistry implements XMLSchemaRegistry {
+ private final XmlSchemaCollection collection;
+
+ /**
+ * @param collection
+ */
+ public DefaultXMLSchemaRegistry(XmlSchemaCollection collection) {
+ super();
+ this.collection = collection;
+ }
+
+ public DefaultXMLSchemaRegistry() {
+ super();
+ this.collection = new XmlSchemaCollection();
+ }
+
+ public XmlSchemaElement getElement(QName name) {
+ return collection.getElementByQName(name);
+ }
+
+ public XmlSchemaType getType(QName name) {
+ return collection.getTypeByQName(name);
+ }
+
+ public List<XmlSchema> loadSchemas(Definition definition) {
+ Types types = definition.getTypes();
+ if (types == null) {
+ return Collections.emptyList();
+ }
+ List<XmlSchema> schemas = new ArrayList<XmlSchema>();
+ for (Object ext : types.getExtensibilityElements()) {
+ if (ext instanceof Schema) {
+ Element element = ((Schema) ext).getElement();
+ XmlSchema s = collection.read(element, element.getBaseURI());
+ schemas.add(s);
+ }
+ }
+ return schemas;
+ }
+
+ public XmlSchema loadSchema(String namespace, URL location) throws
IOException, XmlSchemaException {
+ XmlSchema schema;
+ XmlSchema[] schemaList =
collection.getXmlSchema(location.toExternalForm());
+ if (schemaList != null && schemaList.length > 0) {
+ schema = schemaList[0];
+ } else {
+ InputStream is = location.openStream();
+ schema = collection.read(new InputStreamReader(is), null);
+ is.close();
+ }
+ if (namespace != null && schema != null &&
!namespace.equals(schema.getTargetNamespace())) {
+ throw new XmlSchemaException(namespace + " != " +
schema.getTargetNamespace());
+ }
+ return schema;
+ }
+
+ public XmlSchema loadSchema(String schemaLocation, ClassLoader
classLoader) throws IOException, XmlSchemaException {
+ int index = schemaLocation.indexOf(' ');
+ if (index == -1) {
+ throw new XmlSchemaException("Invalid schemaLocation: " +
schemaLocation);
+ }
+ String namespace = schemaLocation.substring(0, index).trim();
+ URL url;
+ URI uri;
+ try {
+ uri = new URI(schemaLocation.substring(index + 1).trim());
+ } catch (URISyntaxException e) {
+ throw new XmlSchemaException("Invalid schemaLocation: " +
schemaLocation);
+ }
+ if (uri.isAbsolute()) {
+ url = uri.toURL();
+ } else {
+ url = classLoader.getResource(uri.toString());
+ if (url == null) {
+ throw new XmlSchemaException("Resource cannot be resolved:
schemaLocation: " + schemaLocation);
+ }
+ }
+ return loadSchema(namespace, url);
+ }
+
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/DefaultXMLSchemaRegistry.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,35 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import org.apache.tuscany.interfacedef.InvalidInterfaceException;
+
+/**
+ * An exception to indicate the WSDL definition is invalid
+ *
+ * @version $Rev$ $Date$
+ */
+public class InvalidWSDLException extends InvalidInterfaceException {
+ private static final long serialVersionUID = 3742887584293256519L;
+
+ public InvalidWSDLException(String message) {
+ super(message);
+ }
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/InvalidWSDLException.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import javax.wsdl.PortType;
+
+import org.apache.tuscany.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.interfacedef.wsdl.WSDLInterface;
+
+/**
+ * Introspector for creating WSDLInterface definitions from WSDL PortTypes.
+ *
+ * @version $Rev$ $Date$
+ */
+public interface WSDLInterfaceIntrospector {
+
+ /**
+ * Introspect a WSDL portType and return a WSDL interface definition.
+ *
+ * @param type the portType to inspect
+ * @return a WSDLInterface corresponding to the WSDL portType
+ */
+ WSDLInterface introspect(PortType portType) throws
InvalidInterfaceException;
+
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLInterfaceIntrospector.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,517 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+import javax.wsdl.Fault;
+import javax.wsdl.Input;
+import javax.wsdl.Message;
+import javax.wsdl.Output;
+import javax.wsdl.Part;
+import javax.xml.namespace.QName;
+
+import org.apache.tuscany.interfacedef.DataType;
+import org.apache.tuscany.interfacedef.InvalidInterfaceException;
+import org.apache.tuscany.interfacedef.Operation;
+import org.apache.tuscany.interfacedef.impl.DataTypeImpl;
+import org.apache.tuscany.interfacedef.impl.OperationImpl;
+import org.apache.tuscany.interfacedef.util.ElementInfo;
+import org.apache.tuscany.interfacedef.util.FaultException;
+import org.apache.tuscany.interfacedef.util.TypeInfo;
+import org.apache.tuscany.interfacedef.util.WrapperInfo;
+import org.apache.tuscany.interfacedef.util.XMLType;
+import org.apache.ws.commons.schema.XmlSchemaComplexType;
+import org.apache.ws.commons.schema.XmlSchemaElement;
+import org.apache.ws.commons.schema.XmlSchemaObject;
+import org.apache.ws.commons.schema.XmlSchemaObjectCollection;
+import org.apache.ws.commons.schema.XmlSchemaParticle;
+import org.apache.ws.commons.schema.XmlSchemaSequence;
+import org.apache.ws.commons.schema.XmlSchemaSimpleType;
+import org.apache.ws.commons.schema.XmlSchemaType;
+
+/**
+ * Metadata for a WSDL operation
+ *
+ * @version $Rev$ $Date$
+ */
+public class WSDLOperation {
+ protected XMLSchemaRegistry schemaRegistry;
+ protected javax.wsdl.Operation operation;
+ protected Operation operationModel;
+ protected DataType<List<DataType>> inputType;
+ protected DataType<XMLType> outputType;
+ protected List<DataType<XMLType>> faultTypes;
+ private String dataBinding;
+
+ /**
+ * @param operation The WSDL4J operation
+ * @param dataBinding The default databinding
+ * @param schemaRegistry The XML Schema registry
+ */
+ public WSDLOperation(javax.wsdl.Operation operation, String dataBinding,
XMLSchemaRegistry schemaRegistry) {
+ super();
+ this.operation = operation;
+ this.dataBinding = dataBinding;
+ this.schemaRegistry = schemaRegistry;
+ this.wrapper = new Wrapper();
+ }
+
+ private Wrapper wrapper;
+
+ private Boolean wrapperStyle;
+
+ /**
+ * Test if the operation qualifies wrapper style as defined by the JAX-WS
+ * 2.0 spec
+ *
+ * @return true if the operation qualifies wrapper style, otherwise false
+ */
+ public boolean isWrapperStyle() throws InvalidWSDLException {
+ if (wrapperStyle == null) {
+ wrapperStyle =
+ wrapper.getInputChildElements() != null &&
(operation.getOutput() == null || wrapper
+ .getOutputChildElements() != null);
+ }
+ return wrapperStyle;
+ }
+
+ public Wrapper getWrapper() throws InvalidInterfaceException {
+ if (!isWrapperStyle()) {
+ throw new IllegalStateException("The operation is not wrapper
style.");
+ } else {
+ return wrapper;
+ }
+ }
+
+ /**
+ * @return
+ * @throws InvalidServiceContractException
+ */
+ public DataType<List<DataType>> getInputType() throws InvalidWSDLException
{
+ if (inputType == null) {
+ Input input = operation.getInput();
+ Message message = (input == null) ? null : input.getMessage();
+ inputType = getMessageType(message);
+ inputType.setDataBinding("idl:input");
+ }
+ return inputType;
+ }
+
+ /**
+ * @return
+ * @throws NotSupportedWSDLException
+ */
+ public DataType<XMLType> getOutputType() throws InvalidWSDLException {
+ if (outputType == null) {
+ Output output = operation.getOutput();
+ Message outputMsg = (output == null) ? null : output.getMessage();
+
+ List outputParts = (outputMsg == null) ? null :
outputMsg.getOrderedParts(null);
+ if (outputParts != null && outputParts.size() > 0) {
+ if (outputParts.size() > 1) {
+ // We don't support output with multiple parts
+ throw new InvalidWSDLException("Multi-part output is not
supported");
+ }
+ Part part = (Part)outputParts.get(0);
+ outputType = new WSDLPart(part, Object.class).getDataType();
+ // outputType.setMetadata(WSDLOperation.class.getName(), this);
+ }
+ }
+ return outputType;
+ }
+
+ /**
+ * @return
+ * @throws NotSupportedWSDLException
+ */
+ public List<DataType<XMLType>> getFaultTypes() throws InvalidWSDLException
{
+ if (faultTypes == null) {
+ Collection faults = operation.getFaults().values();
+ faultTypes = new ArrayList<DataType<XMLType>>();
+ for (Object f : faults) {
+ Fault fault = (Fault)f;
+ Message faultMsg = fault.getMessage();
+ List faultParts = faultMsg.getOrderedParts(null);
+ if (faultParts.size() != 1) {
+ throw new InvalidWSDLException("The fault message MUST have a
single part");
+ }
+ Part part = (Part)faultParts.get(0);
+ WSDLPart wsdlPart = new WSDLPart(part, FaultException.class);
+ faultTypes.add(wsdlPart.getDataType());
+ }
+ }
+ return faultTypes;
+ }
+
+ private DataType<List<DataType>> getMessageType(Message message) throws
InvalidWSDLException {
+ List<DataType> partTypes = new ArrayList<DataType>();
+ if (message != null) {
+ Collection parts = message.getOrderedParts(null);
+ for (Object p : parts) {
+ WSDLPart part = new WSDLPart((Part)p, Object.class);
+ DataType<XMLType> partType = part.getDataType();
+ partTypes.add(partType);
+ }
+ }
+ return new DataTypeImpl<List<DataType>>(dataBinding, Object[].class,
partTypes);
+ }
+
+ /**
+ * @return
+ * @throws NotSupportedWSDLException
+ */
+ public Operation getOperation() throws InvalidInterfaceException {
+ if (operationModel == null) {
+ boolean oneway = (operation.getOutput() == null);
+ operationModel = new OperationImpl();
+ operationModel.setName(operation.getName());
+ operationModel.getFaultTypes().addAll(getFaultTypes());
+ operationModel.setNonBlocking(oneway);
+
operationModel.setConversationSequence(Operation.ConversationSequence.NO_CONVERSATION);
+ if (isWrapperStyle()) {
+ WrapperInfo wrapperInfo = getWrapper().getWrapperInfo();
+
operationModel.setInputType(wrapperInfo.getUnwrappedInputType());
+
operationModel.setOutputType(wrapperInfo.getUnwrappedOutputType());
+ } else {
+ List<DataType> inputTypes = new ArrayList<DataType>();
+ inputTypes.add(getInputType());
+ DataType<List<DataType>> inputType = new
DataTypeImpl<List<DataType>>("idl:unwrapped.input", Object[].class,
+
inputTypes);
+ operationModel.setInputType(inputType);
+ operationModel.setOutputType(getOutputType());
+ }
+ }
+ return operationModel;
+ }
+
+ /**
+ * Metadata for a WSDL part
+ */
+ public class WSDLPart {
+ private Part part;
+
+ private XmlSchemaElement element;
+
+ private DataType<XMLType> dataType;
+
+ public WSDLPart(Part part, Class javaType) throws InvalidWSDLException
{
+ this.part = part;
+ QName elementName = part.getElementName();
+ if (elementName != null) {
+ element = schemaRegistry.getElement(elementName);
+ if (element == null) {
+ throw new InvalidWSDLException("Element cannot be resolved:
" + elementName.toString());
+ }
+ } else {
+ // Create an faked XSD element to host the metadata
+ element = new XmlSchemaElement();
+ element.setName(part.getName());
+ element.setQName(new QName(null, part.getName()));
+ QName typeName = part.getTypeName();
+ if (typeName != null) {
+ XmlSchemaType type = schemaRegistry.getType(typeName);
+ if (type == null) {
+ throw new InvalidWSDLException("Type cannot be resolved:
" + typeName.toString());
+ }
+ element.setSchemaType(type);
+ element.setSchemaTypeName(type.getQName());
+ }
+ }
+ dataType = new DataTypeImpl<XMLType>(dataBinding, javaType, new
XMLType(getElementInfo(element)));
+ // dataType.setMetadata(WSDLPart.class.getName(), this);
+ // dataType.setMetadata(ElementInfo.class.getName(),
getElementInfo(element));
+ }
+
+ /**
+ * @return the element
+ */
+ public XmlSchemaElement getElement() {
+ return element;
+ }
+
+ /**
+ * @return the part
+ */
+ public Part getPart() {
+ return part;
+ }
+
+ /**
+ * @return the dataType
+ */
+ public DataType<XMLType> getDataType() {
+ return dataType;
+ }
+ }
+
+ /**
+ * The "Wrapper Style" WSDL operation is defined by The Java API for
+ * XML-Based Web Services (JAX-WS) 2.0 specification, section 2.3.1.2
+ * Wrapper Style. <p/> A WSDL operation qualifies for wrapper style mapping
+ * only if the following criteria are met:
+ * <ul>
+ * <li>(i) The operation�s input and output messages (if present) each
+ * contain only a single part
+ * <li>(ii) The input message part refers to a global element declaration
+ * whose localname is equal to the operation name
+ * <li>(iii) The output message part refers to a global element declaration
+ * <li>(iv) The elements referred to by the input and output message parts
+ * (henceforth referred to as wrapper elements) are both complex types
+ * defined using the xsd:sequence compositor
+ * <li>(v) The wrapper elements only contain child elements, they must not
+ * contain other structures such as wildcards (element or attribute),
+ * xsd:choice, substitution groups (element references are not permitted)
or
+ * attributes; furthermore, they must not be nillable.
+ * </ul>
+ */
+ public class Wrapper {
+ private XmlSchemaElement inputWrapperElement;
+
+ private XmlSchemaElement outputWrapperElement;
+
+ private List<XmlSchemaElement> inputElements;
+
+ private List<XmlSchemaElement> outputElements;
+
+ private DataType<List<DataType<XMLType>>> unwrappedInputType;
+
+ private DataType<XMLType> unwrappedOutputType;
+
+ private transient WrapperInfo wrapperInfo;
+
+ private List<XmlSchemaElement> getChildElements(XmlSchemaElement
element) throws InvalidWSDLException {
+ if (element == null) {
+ return null;
+ }
+ if (element.isNillable()) {
+ // Wrapper element cannot be nillable
+ return null;
+ }
+ XmlSchemaType type = element.getSchemaType();
+ if (type == null) {
+ String qName = element.getQName().toString();
+ throw new InvalidWSDLException("The XML schema element does not
have a type: " + qName);
+ }
+ if (!(type instanceof XmlSchemaComplexType)) {
+ // Has to be a complexType
+ return null;
+ }
+ XmlSchemaComplexType complexType = (XmlSchemaComplexType)type;
+ if (complexType.getAttributes().getCount() != 0 ||
complexType.getAnyAttribute() != null) {
+ // No attributes
+ return null;
+ }
+ XmlSchemaParticle particle = complexType.getParticle();
+ if (particle == null) {
+ // No particle
+ return Collections.emptyList();
+ }
+ if (!(particle instanceof XmlSchemaSequence)) {
+ return null;
+ }
+ XmlSchemaSequence sequence =
(XmlSchemaSequence)complexType.getParticle();
+ XmlSchemaObjectCollection items = sequence.getItems();
+ List<XmlSchemaElement> childElements = new
ArrayList<XmlSchemaElement>();
+ for (int i = 0; i < items.getCount(); i++) {
+ XmlSchemaObject schemaObject = items.getItem(i);
+ if (!(schemaObject instanceof XmlSchemaElement)) {
+ return null;
+ }
+ XmlSchemaElement childElement = (XmlSchemaElement)schemaObject;
+ if (childElement.getName() == null ||
childElement.getRefName() != null) {
+ return null;
+ }
+ // TODO: Do we support maxOccurs >1 ?
+ if (childElement.getMaxOccurs() > 1) {
+ return null;
+ }
+ childElements.add(childElement);
+ }
+ return childElements;
+ }
+
+ /**
+ * Return a list of child XSD elements under the wrapped request
element
+ *
+ * @return a list of child XSD elements or null if if the request
+ * element is not wrapped
+ */
+ public List<XmlSchemaElement> getInputChildElements() throws
InvalidWSDLException {
+ if (inputElements != null) {
+ return inputElements;
+ }
+ Input input = operation.getInput();
+ if (input != null) {
+ Message inputMsg = input.getMessage();
+ Collection parts = inputMsg.getParts().values();
+ if (parts.size() != 1) {
+ return null;
+ }
+ Part part = (Part)parts.iterator().next();
+ QName elementName = part.getElementName();
+ if (elementName == null) {
+ return null;
+ }
+ if (!operation.getName().equals(elementName.getLocalPart())) {
+ return null;
+ }
+ inputWrapperElement = schemaRegistry.getElement(elementName);
+ if (inputWrapperElement == null) {
+ throw new InvalidWSDLException("The element is not declared in
a XML schema: " + elementName
+ .toString());
+ }
+ inputElements = getChildElements(inputWrapperElement);
+ return inputElements;
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Return a list of child XSD elements under the wrapped response
+ * element
+ *
+ * @return a list of child XSD elements or null if if the response
+ * element is not wrapped
+ */
+ public List<XmlSchemaElement> getOutputChildElements() throws
InvalidWSDLException {
+ if (outputElements != null) {
+ return outputElements;
+ }
+ Output output = operation.getOutput();
+ if (output != null) {
+ Message outputMsg = output.getMessage();
+ Collection parts = outputMsg.getParts().values();
+ if (parts.size() != 1) {
+ return null;
+ }
+ Part part = (Part)parts.iterator().next();
+ QName elementName = part.getElementName();
+ if (elementName == null) {
+ throw new InvalidWSDLException("The element is not declared in
the XML schema: " + part.getName());
+ }
+ outputWrapperElement = schemaRegistry.getElement(elementName);
+ if (outputWrapperElement == null) {
+ return null;
+ }
+ outputElements = getChildElements(outputWrapperElement);
+ // FIXME: Do we support multiple child elements for the
+ // response?
+ return outputElements;
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * @return the inputWrapperElement
+ */
+ public XmlSchemaElement getInputWrapperElement() {
+ return inputWrapperElement;
+ }
+
+ /**
+ * @return the outputWrapperElement
+ */
+ public XmlSchemaElement getOutputWrapperElement() {
+ return outputWrapperElement;
+ }
+
+ /*
+ public DataType<List<DataType<XMLType>>> getUnwrappedInputType()
throws InvalidWSDLException {
+ if (unwrappedInputType == null) {
+ List<DataType<XMLType>> childTypes = new
ArrayList<DataType<XMLType>>();
+ for (XmlSchemaElement element : getInputChildElements()) {
+ DataType<XMLType> type =
+ new DataType<XMLType>(dataBinding, Object.class, new
XMLType(getElementInfo(element)));
+ // type.setMetadata(ElementInfo.class.getName(),
getElementInfo(element));
+ childTypes.add(type);
+ }
+ unwrappedInputType =
+ new
DataType<List<DataType<XMLType>>>("idl:unwrapped.input", Object[].class,
childTypes);
+ }
+ return unwrappedInputType;
+ }
+
+ public DataType<XMLType> getUnwrappedOutputType() throws
InvalidServiceContractException {
+ if (unwrappedOutputType == null) {
+ List<XmlSchemaElement> elements = getOutputChildElements();
+ if (elements != null && elements.size() > 0) {
+ if (elements.size() > 1) {
+ // We don't support output with multiple parts
+ throw new NotSupportedWSDLException("Multi-part output is
not supported");
+ }
+ XmlSchemaElement element = elements.get(0);
+ unwrappedOutputType =
+ new DataType<XMLType>(dataBinding, Object.class, new
XMLType(getElementInfo(element)));
+ //
unwrappedOutputType.setMetadata(ElementInfo.class.getName(),
getElementInfo(element));
+ }
+ }
+ return unwrappedOutputType;
+ }
+ */
+
+ public WrapperInfo getWrapperInfo() throws InvalidWSDLException {
+ if (wrapperInfo == null) {
+ ElementInfo in = getElementInfo(getInputWrapperElement());
+ ElementInfo out = getElementInfo(getOutputWrapperElement());
+ List<ElementInfo> inChildren = new ArrayList<ElementInfo>();
+ for (XmlSchemaElement e : getInputChildElements()) {
+ inChildren.add(getElementInfo(e));
+ }
+ List<ElementInfo> outChildren = new ArrayList<ElementInfo>();
+ if (out != null) {
+ for (XmlSchemaElement e : getOutputChildElements()) {
+ outChildren.add(getElementInfo(e));
+ }
+ }
+ wrapperInfo =
+ new WrapperInfo(dataBinding, in, out, inChildren,
outChildren);
+ }
+ return wrapperInfo;
+ }
+ }
+
+ private static ElementInfo getElementInfo(XmlSchemaElement element) {
+ if (element == null) {
+ return null;
+ }
+ return new ElementInfo(element.getQName(),
getTypeInfo(element.getSchemaType()));
+ }
+
+ private static TypeInfo getTypeInfo(XmlSchemaType type) {
+ if (type == null) {
+ return null;
+ }
+ XmlSchemaType baseType = (XmlSchemaType)type.getBaseSchemaType();
+ QName name = type.getQName();
+ boolean simple = (type instanceof XmlSchemaSimpleType);
+ if (baseType == null) {
+ return new TypeInfo(name, simple, null);
+ } else {
+ return new TypeInfo(name, simple, getTypeInfo(baseType));
+ }
+ }
+
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/WSDLOperation.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Added:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java?view=auto&rev=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
(added)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
Tue Apr 10 23:26:26 2007
@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.tuscany.interfacedef.wsdl.introspect;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.List;
+
+import javax.wsdl.Definition;
+import javax.xml.namespace.QName;
+
+import org.apache.ws.commons.schema.XmlSchema;
+import org.apache.ws.commons.schema.XmlSchemaElement;
+import org.apache.ws.commons.schema.XmlSchemaException;
+import org.apache.ws.commons.schema.XmlSchemaType;
+
+/**
+ * A service for caching XML Schemas
+ *
+ * @version $Rev$ $Date$
+ */
+public interface XMLSchemaRegistry {
+ /**
+ * Load all inline schemas from the WSDL definition
+ *
+ * @param definition The WSDL defintion whose types element contains a list of schemas
+ * @return A list of inline schemas
+ */
+ List<XmlSchema> loadSchemas(Definition definition);
+
+ /**
+ * Loads and registers a XML schema.
+ *
+ * @param namespace the expected namespace, or null if any namespace
should be allowed
+ * @param location the location to load the schema from
+ * @return the loaded Definition
+ * @throws IOException if there was a problem reading the document
+ * @throws XmlSchemaException if there was a problem parsing the schema
+ */
+ XmlSchema loadSchema(String namespace, URL location) throws IOException,
XmlSchemaException;
+
+ /**
+ * Load and register a XML schema as specified in a XSD schemaLocation
attribute.
+ *
+ * @param schemaLocation the value of the schemaLocation attribute
+ * @param classLoader application classloader used to support relative
locations
+ * @return the loaded schema
+ * @throws IOException if there was a problem reading the document
+ * @throws XmlSchemaException if there was a problem parsing the schema
+ */
+ XmlSchema loadSchema(String schemaLocation, ClassLoader classLoader)
throws IOException, XmlSchemaException;
+
+ /**
+ * Returns the XSD Element with the supplied qualified name, or null if no
such element has been defined.
+ *
+ * @param name the qualified name of the XSD element
+ * @return the XSD element for the supplied name, or null if none has been
defined
+ */
+ XmlSchemaElement getElement(QName name);
+
+ /**
+ * Returns the XmlSchemaType with the supplied qualified name, or null if
no such type has been defined.
+ *
+ * @param name the qualified name of the XSD type
+ * @return the XSD type for the supplied name, or null if none has been
defined
+ */
+ XmlSchemaType getType(QName name);
+
+
+
+}
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
------------------------------------------------------------------------------
svn:eol-style = native
Propchange:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/introspect/XMLSchemaRegistry.java
------------------------------------------------------------------------------
svn:keywords = Rev Date
Modified:
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/xml/WSDLInterfaceProcessor.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/xml/WSDLInterfaceProcessor.java?view=diff&rev=527397&r1=527396&r2=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/xml/WSDLInterfaceProcessor.java
(original)
+++
incubator/tuscany/java/sca/modules/interface-wsdl-xml/src/main/java/org/apache/tuscany/interfacedef/wsdl/xml/WSDLInterfaceProcessor.java
Tue Apr 10 23:26:26 2007
@@ -28,11 +28,15 @@
import javax.xml.stream.XMLStreamWriter;
import org.apache.tuscany.assembly.xml.Constants;
+import org.apache.tuscany.interfacedef.InvalidInterfaceException;
import org.apache.tuscany.interfacedef.wsdl.WSDLDefinition;
import org.apache.tuscany.interfacedef.wsdl.WSDLFactory;
import org.apache.tuscany.interfacedef.wsdl.WSDLInterface;
import org.apache.tuscany.interfacedef.wsdl.WSDLInterfaceContract;
import org.apache.tuscany.interfacedef.wsdl.impl.DefaultWSDLFactory;
+import
org.apache.tuscany.interfacedef.wsdl.introspect.DefaultWSDLInterfaceIntrospector;
+import
org.apache.tuscany.interfacedef.wsdl.introspect.DefaultXMLSchemaRegistry;
+import
org.apache.tuscany.interfacedef.wsdl.introspect.WSDLInterfaceIntrospector;
import org.apache.tuscany.services.spi.contribution.ArtifactResolver;
import org.apache.tuscany.services.spi.contribution.ContributionReadException;
import
org.apache.tuscany.services.spi.contribution.ContributionResolveException;
@@ -43,13 +47,15 @@
public class WSDLInterfaceProcessor implements
StAXArtifactProcessor<WSDLInterfaceContract>, WSDLConstants {
private WSDLFactory wsdlFactory;
+ private WSDLInterfaceIntrospector wsdlIntrospector;
- public WSDLInterfaceProcessor(WSDLFactory wsdlFactory) {
+ public WSDLInterfaceProcessor(WSDLFactory wsdlFactory,
WSDLInterfaceIntrospector wsdlIntrospector) {
this.wsdlFactory = wsdlFactory;
+ this.wsdlIntrospector = wsdlIntrospector;
}
public WSDLInterfaceProcessor() {
- this(new DefaultWSDLFactory());
+ this(new DefaultWSDLFactory(), new
DefaultWSDLInterfaceIntrospector(new DefaultXMLSchemaRegistry()));
}
/**
@@ -143,7 +149,7 @@
}
}
- private WSDLInterface resolveWSDLInterface(WSDLInterface wsdlInterface, ArtifactResolver resolver) {
+ private WSDLInterface resolveWSDLInterface(WSDLInterface wsdlInterface,
ArtifactResolver resolver) throws ContributionResolveException {
if (wsdlInterface != null && wsdlInterface.isUnresolved()) {
@@ -160,15 +166,13 @@
PortType portType =
wsdlDefinition.getDefinition().getPortType(wsdlInterface.getName());
if (portType != null) {
- // Add the resolved WSDL interface to the resolver
- // so that it's found next time
- wsdlInterface.setPortType(portType);
-
- // Introspect the WSDL portType and populate the interface and
- // operations
- //FIXME
-
- wsdlInterface.setUnresolved(false);
+ // Introspect the WSDL portType and add the resulting
+ // WSDLInterface to the resolver
+ try {
+ wsdlInterface =
wsdlIntrospector.introspect(portType);
+ } catch (InvalidInterfaceException e) {
+ throw new ContributionResolveException(e);
+ }
resolver.add(wsdlInterface);
}
}
Modified: incubator/tuscany/java/sca/modules/interface-wsdl/pom.xml
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface-wsdl/pom.xml?view=diff&rev=527397&r1=527396&r2=527397
==============================================================================
--- incubator/tuscany/java/sca/modules/interface-wsdl/pom.xml (original)
+++ incubator/tuscany/java/sca/modules/interface-wsdl/pom.xml Tue Apr 10
23:26:26 2007
@@ -34,6 +34,12 @@
<artifactId>tuscany-interface</artifactId>
<version>1.0-incubating-SNAPSHOT</version>
</dependency>
+
+ <dependency>
+ <groupId>org.apache.ws.commons.schema</groupId>
+ <artifactId>XmlSchema</artifactId>
+ <version>1.2</version>
+ </dependency>
<dependency>
<groupId>wsdl4j</groupId>
Modified:
incubator/tuscany/java/sca/modules/interface/src/main/java/org/apache/tuscany/interfacedef/util/WrapperInfo.java
URL:
http://svn.apache.org/viewvc/incubator/tuscany/java/sca/modules/interface/src/main/java/org/apache/tuscany/interfacedef/util/WrapperInfo.java?view=diff&rev=527397&r1=527396&r2=527397
==============================================================================
---
incubator/tuscany/java/sca/modules/interface/src/main/java/org/apache/tuscany/interfacedef/util/WrapperInfo.java
(original)
+++
incubator/tuscany/java/sca/modules/interface/src/main/java/org/apache/tuscany/interfacedef/util/WrapperInfo.java
Tue Apr 10 23:26:26 2007
@@ -56,7 +56,7 @@
private List<ElementInfo> outputChildElements;
- private DataType<List<DataType<XMLType>>> unwrappedInputType;
+ private DataType<List<DataType>> unwrappedInputType;
private DataType<XMLType> unwrappedOutputType;
@@ -106,14 +106,14 @@
/**
* @return the unwrappedInputType
*/
- public DataType<List<DataType<XMLType>>> getUnwrappedInputType() {
+ public DataType<List<DataType>> getUnwrappedInputType() {
if (unwrappedInputType == null) {
- List<DataType<XMLType>> childTypes = new
ArrayList<DataType<XMLType>>();
+ List<DataType> childTypes = new ArrayList<DataType>();
for (ElementInfo element : getInputChildElements()) {
DataType<XMLType> type = new
DataTypeImpl<XMLType>(dataBinding, Object.class, new XMLType(element));
childTypes.add(type);
}
- unwrappedInputType = new
DataTypeImpl<List<DataType<XMLType>>>("idl:unwrapped.input", Object[].class,
+ unwrappedInputType = new
DataTypeImpl<List<DataType>>("idl:unwrapped.input", Object[].class,
childTypes);
}
return unwrappedInputType;
@@ -122,7 +122,7 @@
/**
* @return the unwrappedOutputType
*/
- public DataType<XMLType> getUnwrappedOutputType() {
+ public DataType getUnwrappedOutputType() {
if (unwrappedOutputType == null) {
List<ElementInfo> elements = getOutputChildElements();
if (elements != null && elements.size() > 0) {
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