here is a simple wrapper-class for uno-services. please note the
included methods for inspecting uno-services in Java (something similar
to the XRay-tool)...
<?xml version="1.0"?>
<snippet language="Java" application="Writer">
<keywords>
<keyword>wrapper</keyword>
<keyword>UnoRuntime.queryInterface</keyword>
<keyword>queryInterface</keyword>
<keyword>inspect</keyword>
<keyword>inspection</keyword>
<keyword>methods</keyword>
<keyword>interfaces</keyword>
<keyword>property</keyword>
<keyword>properties</keyword>
<keyword>services</keyword>
<keyword>object</keyword>
<keyword>convenience</keyword>
<keyword>class</keyword>
<keyword>information</keyword>
</keywords>
<authors>
<author id="CL" initial="true" email="[EMAIL PROTECTED]">Christoph Lutz</author>
</authors>
<question heading="Simple wrapper for uno-services">Is there a way to avoid all the UnoRuntime.queryInterface-calls
<p>Programming in Java is very uncomfortable. The Java-program is nearly unreadable cause of the many temporary variables you need to hold interface-instances. </p>
<p></p>
<p>also uno-services are not very transparent. How do I get the names of the provided services, interfaces, properties and methods?</p>
</question>
<answer>
<p>use a wrapperclass to let the wrapper perform the queryInterface-calls. This is my wrapper class - simple but effective. </p>
<p></p>
<p>It also provides method for a runtime-inspection similar to the famous XRay-tool.</p>
<listing>/*
* A simple wrapperclass for uno-services.
* Copyright (C) 2005 Christoph Lutz
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
import java.lang.reflect.Method;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeSet;
import com.sun.star.beans.Property;
import com.sun.star.beans.XPropertySet;
import com.sun.star.beans.XPropertySetInfo;
import com.sun.star.bridge.XUnoUrlResolver;
import com.sun.star.container.XEnumeration;
import com.sun.star.container.XEnumerationAccess;
import com.sun.star.frame.XComponentLoader;
import com.sun.star.frame.XDesktop;
import com.sun.star.lang.XMultiComponentFactory;
import com.sun.star.lang.XServiceInfo;
import com.sun.star.lang.XTypeProvider;
import com.sun.star.text.XText;
import com.sun.star.text.XTextDocument;
import com.sun.star.text.XTextField;
import com.sun.star.text.XTextRange;
import com.sun.star.uno.Type;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;
import com.sun.star.uno.XInterface;
import com.sun.star.util.XCloseable;
/**
* The class UnoService is a wrapper for UnoService-Objects provided by the
* OpenOffice.org API. The main aim of this wrapper is to make java-programs
* more readable by avoiding the neccessity of UnoRuntime.queryInterface-calls.
* The wrapper performs the queryInterface-calls and holds the corresponding
* interface-instances. Temporary variables for singular interface-types are no
* longer needed in your own java-programs.
*
* The wrapper provides convenience-methods to certain aspects of uno-services
* like getter and setter for property-values.
*
* The wrapper also increases tranzperency when working with uno-objects. It
* provides methods to inspect uno-services at runtime and print information
* about supported-services, implemented interfaces, properties and methods. It
* makes Uno-Programming in java similar to OOo-Basic programming using tools
* like the famous XRay-tool.
*/
public class UnoService {
/**
* This field contains the original object of the uno-service.
*/
private final Object unoObject;
/**
* This map contains all at least one time required interface-instances of
* this uno-service.
*/
private Map interfaceMap;
/**
* The constructor creates a new wrapperclass for a given uno-service
* object.
*
* @param unoObject
* an arbitrary object returned by the OOo-API
*/
public UnoService(Object unoObject) {
this.unoObject = unoObject;
interfaceMap = new HashMap();
}
/**
* This method returns the interface-instance of this UnoService for a
* specified interface-type. It performs a UnoRuntime.queryInterface call
* and caches the result interface-type. If the service doesn't implement
* the required interface, the method returns <code>null</code>. Use the
* construct <code>if (myUnoService.xAnInterface() != null) ...</code> to
* ensure the service really implements the interface.
*
* @param ifClass
* interface-type to query for.
* @return The interface instance for this uno-service. If the service
* doesn't implement the required interface, the method returns
* <code>null</null>.
*/
public Object queryInterface(Class ifClass) {
if (!interfaceMap.containsKey(ifClass)) {
Object ifInstance = UnoRuntime.queryInterface(ifClass,
this.unoObject);
interfaceMap.put(ifClass, ifInstance);
}
return interfaceMap.get(ifClass);
}
/***************************************************************************
* Methods to inspect the uno-service.
**************************************************************************/
/**
* This method returns the implementationName of this unoService-object.
*
* @return the implementationName of this unoService-object of the String
* "noneUnoService" if the object is not a proper UnoService.
*/
public String getImplememtationName() {
if (this.xServiceInfo() != null) {
return this.xServiceInfo().getImplementationName();
} else {
return "noneUnoService";
}
}
/**
* This method provides information about supported services, implemented
* interfaces, supported properties and methods of this uno-service. The
* lists of services, implemented interfaces and methods are sorted in
* alphabetical ascending order.
*
* @return a string containing all the inspection information.
*/
public String features() {
String str = "";
str += "------------------------------------------\n";
str += "ImplementationName: "
+ this.xServiceInfo().getImplementationName() + "\n\n";
str += dbg_Services();
str += dbg_SupportedInterfaces();
str += dbg_Properties();
str += dbg_SupportedInterfacesAndMethods();
return str;
}
/**
* This method prints the inspection-information provides by features() to
* System.out.
*/
public void printFeatures() {
System.out.println(features());
}
/**
* This method returns a sorted list of services supported by this
* uno-service.
*
* @return a string containig the inspection-information.
*/
private String dbg_Services() {
String str = "Supported UNO-Services: ";
if (this.xServiceInfo() != null) {
str += "\n";
Iterator servicesIterator = getSortedServiceIterator();
while (servicesIterator.hasNext()) {
str += " " + ((String) servicesIterator.next()) + "\n";
}
} else {
str += "none\n";
}
return str + "\n";
}
/**
* This method returns a sorted list of properties supported by this
* uno-service.
*
* @return a string containig the inspection-information.
*/
private String dbg_Properties() {
String str = "Supported Properties: ";
if (this.xPropertySet() != null) {
str += "\n";
Property[] props = this.xPropertySet().getPropertySetInfo()
.getProperties();
for (int i = 0; i < props.length; i++) {
str += " " + props[i].Name + " - "
+ props[i].Type.getZClass().getSimpleName() + "\n";
}
} else {
str = "none";
}
return str + "\n";
}
/**
* This method returns a sorted list of implemented interfaces.
*
* @return a string containig the inspection-information.
*/
public String dbg_SupportedInterfaces() {
String str = "Supported Interfaces: ";
if (this.xTypeProvider() != null) {
str += "\n";
Iterator typesIterator = getSortedTypesIterator();
while (typesIterator.hasNext()) {
str += " " + ((Type) typesIterator.next()).getTypeName()
+ "\n";
}
} else {
str += "none";
}
return str + "\n";
}
/**
* This method returns a sorted list of implemented interfaces and their
* corresponding methods.
*
* @return a string containig the inspection-information.
*/
private String dbg_SupportedInterfacesAndMethods() {
String str = "Supported Interfaces and Methods: ";
if (this.xTypeProvider() != null) {
str += "\n";
Iterator typesIterator = getSortedTypesIterator();
while (typesIterator.hasNext()) {
Type type = (Type) typesIterator.next();
str += " " + type.getTypeName() + "\n";
Iterator methodsIterator = getSortedMethodsIterator(type);
while (methodsIterator.hasNext()) {
Method m = (Method) methodsIterator.next();
str += " - " + m.getName() + "(";
Class[] par = m.getParameterTypes();
for (int k = 0; k < par.length; k++) {
if (k != 0) {
str += ", ";
}
str += par[k].getSimpleName();
}
str += ") - " + m.getReturnType().getSimpleName() + "\n";
}
}
} else {
str += "none";
}
return str + "\n";
}
/**
* This method returns an Iterator to a sorted list of supported services.
*/
private Iterator getSortedServiceIterator() {
return getSortedArrayIterator(this.xServiceInfo()
.getSupportedServiceNames(), new Comparator() {
public int compare(Object arg0, Object arg1) {
return ((String) arg0).compareTo((String) arg1);
}
public boolean equals(Object obj) {
return this == obj;
}
});
}
/**
* This method returns an Iterator to a sorted list of methods supported by
* the specified interface-type.
*/
private Iterator getSortedMethodsIterator(Type type) {
Iterator methodsIterator = getSortedArrayIterator(type.getZClass()
.getDeclaredMethods(), new Comparator() {
public int compare(Object arg0, Object arg1) {
return ((Method) arg0).getName().compareTo(
((Method) arg1).getName());
}
public boolean equals(Object obj) {
return this == obj;
}
});
return methodsIterator;
}
/**
* This method returns an Iterator to a sorted List of implemented
* interface-types.
*/
private Iterator getSortedTypesIterator() {
Iterator i = getSortedArrayIterator(this.xTypeProvider().getTypes(),
new Comparator() {
public int compare(Object arg0, Object arg1) {
return ((Type) arg0).getTypeName().compareTo(
((Type) arg1).getTypeName());
}
public boolean equals(Object obj) {
return this == obj;
}
});
return i;
}
/**
* This generic method sorts an array comparing its elements using a
* comperator. The method is needes by the methods
* getSortedServiceIterator(), getSortedMethodsIterator(Type type) and
* getSortedTypesIterator(),
*/
private Iterator getSortedArrayIterator(Object[] array, Comparator c) {
TreeSet set = new TreeSet(c);
for (int i = 0; i < array.length; i++) {
set.add(array[i]);
}
return set.iterator();
}
/***************************************************************************
* convenience-methods
**************************************************************************/
/**
* This method returns the property of the uno-service and wrappes the
* result in a new UnoService-object.
*
* @param p
* the name of the required property
* @return the value of the property, wrapped in an UnoService object.
* @throws Exception
*/
public UnoService getPropertyValue(String p) throws Exception {
if (this.xPropertySet() != null) {
return new UnoService(this.xPropertySet().getPropertyValue(p));
} else {
throw new Exception(
"Service doesn't support interface XPropertySet");
}
}
/**
* This method sets a property-value of this
*
* @param p
* the name of the property to set
* @param o
* the value of the property
* @throws Exception
*/
public void setPropertyValue(String p, Object o) throws Exception {
if (this.xPropertySet() != null) {
this.xPropertySet().setPropertyValue(p, o);
} else {
throw new Exception(
"Service doesn't support interface XPropertySet");
}
}
/**
* This method states if this servic-object provides a specified
* uno-service.
*
* @param s
* the fullqualified name of the service.
* @return true if the object supports the uno-service, otherwise false.
*/
public boolean supportsService(String s) {
if (this.xServiceInfo() != null) {
return this.xServiceInfo().supportsService(s);
} else {
return false;
}
}
/**
* This method returns the original object of this uno-service.
*
* @return original object of this uno-service
*/
public Object getObject() {
return unoObject;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
public String toString() {
return unoObject.toString();
}
/***************************************************************************
* Interface-Access
*
* Extend this section if you need to access an interface not in this list.
**************************************************************************/
public XTextDocument xTextDocument() {
return (XTextDocument) queryInterface(XTextDocument.class);
}
public XComponentLoader xComponentLoader() {
return (XComponentLoader) queryInterface(XComponentLoader.class);
}
public XDesktop xDesktop() {
return (XDesktop) queryInterface(XDesktop.class);
}
public XText xText() {
return (XText) queryInterface(XText.class);
}
public XTextRange xTextRange() {
return (XTextRange) queryInterface(XTextRange.class);
}
public XPropertySet xPropertySet() {
return (XPropertySet) queryInterface(XPropertySet.class);
}
public XCloseable xCloseable() {
return (XCloseable) queryInterface(XCloseable.class);
}
public XComponentContext xComponentContext() {
return (XComponentContext) queryInterface(XComponentContext.class);
}
public XMultiComponentFactory xMultiComponentFactory() {
return (XMultiComponentFactory) queryInterface(XMultiComponentFactory.class);
}
public XUnoUrlResolver xUnoUrlResolver() {
return (XUnoUrlResolver) queryInterface(XUnoUrlResolver.class);
}
public XServiceInfo xServiceInfo() {
return (XServiceInfo) queryInterface(XServiceInfo.class);
}
public XPropertySetInfo xPropertySetInfo() {
return (XPropertySetInfo) queryInterface(XPropertySetInfo.class);
}
public XInterface xInterface() {
return (XInterface) queryInterface(XInterface.class);
}
public XTypeProvider xTypeProvider() {
return (XTypeProvider) queryInterface(XTypeProvider.class);
}
public XEnumerationAccess xEnumerationAccess() {
return (XEnumerationAccess) queryInterface(XEnumerationAccess.class);
}
public XEnumeration xEnumeration() {
return (XEnumeration) queryInterface(XEnumeration.class);
}
public XTextField xTextField() {
return (XTextField) queryInterface(XTextField.class);
}
//... add wrapper-methods for your own interfaces here...
}</listing>
</answer>
<versions>
<version number="1.1.x" status="tested"/>
</versions>
<operating-systems>
<operating-system name="All"/>
</operating-systems>
<changelog>
<change author-id="CL" date="2005-06-12">Initial version</change>
</changelog>
</snippet>
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