kinman 2002/11/22 17:36:49
Modified: jasper2/src/share/org/apache/jasper/compiler Generator.java
Node.java
Added: jasper2/src/share/org/apache/jasper/compiler
TagPluginManager.java
jasper2/src/share/org/apache/jasper/compiler/tagplugin
TagPlugin.java TagPluginContext.java
TagPluginFactory.java
Log:
- Define interfaces for tag plugins.
- Modify Generator to prepare attributes that may be access from plugins.
Revision Changes Path
1.130 +83 -67
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/Generator.java
Index: Generator.java
===================================================================
RCS file:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/Generator.java,v
retrieving revision 1.129
retrieving revision 1.130
diff -u -r1.129 -r1.130
--- Generator.java 22 Nov 2002 23:47:15 -0000 1.129
+++ Generator.java 23 Nov 2002 01:36:49 -0000 1.130
@@ -1558,6 +1558,8 @@
generateLocalVariables( out, n );
}
+ prepareCustomAttributes(n, handlerInfo);
+
if (n.implementsSimpleTag()) {
generateCustomDoTag(n, handlerInfo, tagHandlerVar);
} else {
@@ -1879,6 +1881,69 @@
}
}
+ /**
+ * Preprocess the attributes for the custom tag, except fragment
+ * attributes.
+ */
+ private void prepareCustomAttributes(Node.CustomTag n,
+ TagHandlerInfo handlerInfo)
+ throws JasperException {
+
+ Node.JspAttribute[] attrs = n.getJspAttributes();
+ for (int i=0; i<attrs.length; i++) {
+ String attrValue = attrs[i].getValue();
+ if (attrValue == null) {
+ if (attrs[i].isNamedAttribute() ) {
+ if (!n.checkIfAttributeIsJspFragment(
+ attrs[i].getName())) {
+ attrValue = generateNamedAttributeValue(
+ attrs[i].getNamedAttributeNode() );
+ }
+ }
+ else {
+ continue;
+ }
+ }
+ String attrName = attrs[i].getName();
+
+ Method m = null;
+ Class[] c = null;
+ if (attrs[i].isDynamic()) {
+ c = OBJECT_CLASS;
+ } else {
+ m = handlerInfo.getSetterMethod(attrName);
+ if (m == null) {
+ err.jspError(n, "jsp.error.unable.to_find_method",
+ attrName);
+ }
+ c = m.getParameterTypes();
+ // XXX assert(c.length > 0)
+ }
+
+ if (attrs[i].isExpression()) {
+ // Do nothing
+ } else if (attrs[i].isNamedAttribute()) {
+ if (!n.checkIfAttributeIsJspFragment(attrs[i].getName())
+ && !attrs[i].isDynamic()) {
+ attrValue = convertString(
+ c[0], attrValue, attrName,
+ handlerInfo.getPropertyEditorClass(attrName),
+ false);
+ }
+ } else if (attrs[i].isELInterpreterInput()) {
+ // run attrValue through the expression interpreter
+ attrValue = JspUtil.interpreterCall(this.isTagFile,
+ attrValue, c[0], n.getPrefix(), "_jspx_fnmap" );
+ } else {
+ attrValue = convertString(
+ c[0], attrValue, attrName,
+ handlerInfo.getPropertyEditorClass(attrName),
+ true);
+ }
+ attrs[i].setProcessedValue(attrValue);
+ }
+ }
+
private void generateCustomStart(Node.CustomTag n,
TagHandlerInfo handlerInfo,
String tagHandlerVar,
@@ -2384,70 +2449,20 @@
out.println(");");
}
- Node.JspAttribute[] attrs = n.getJspAttributes();
- for (int i=0; i<attrs.length; i++) {
- String attrValue = attrs[i].getValue();
- if (attrValue == null) {
- if( attrs[i].isNamedAttribute() ) {
- if( n.checkIfAttributeIsJspFragment(
- attrs[i].getName() ) )
- {
- // XXX - no need to generate temporary variable
- // here
- attrValue = generateNamedAttributeJspFragment(
+ Node.JspAttribute[] attrs = n.getJspAttributes();
+ for (int i=0; i<attrs.length; i++) {
+ String attrValue = attrs[i].getProcessedValue();
+ if (attrValue == null && attrs[i].isNamedAttribute() &&
+ n.checkIfAttributeIsJspFragment(attrs[i].getName())) {
+ // XXX - no need to generate temporary variable here
+ attrValue = generateNamedAttributeJspFragment(
attrs[i].getNamedAttributeNode(),
- tagHandlerVar );
- }
- else {
- attrValue = generateNamedAttributeValue(
- attrs[i].getNamedAttributeNode() );
- }
- }
- else {
- continue;
- }
- }
- String attrName = attrs[i].getName();
-
- Method m = null;
- Class[] c = null;
- if (attrs[i].isDynamic()) {
- c = OBJECT_CLASS;
- } else {
- m = handlerInfo.getSetterMethod(attrName);
- if (m == null) {
- err.jspError(n, "jsp.error.unable.to_find_method",
- attrName);
- }
- c = m.getParameterTypes();
- // XXX assert(c.length > 0)
- }
-
- if (attrs[i].isExpression()) {
- // Do nothing
- } else if (attrs[i].isNamedAttribute()) {
- if (!n.checkIfAttributeIsJspFragment(attrs[i].getName())
- && !attrs[i].isDynamic()) {
- attrValue = convertString(
- c[0], attrValue, attrName,
- handlerInfo.getPropertyEditorClass(attrName),
- false);
- }
- } else if (attrs[i].isELInterpreterInput()) {
- // run attrValue through the expression interpreter
- attrValue = JspUtil.interpreterCall(this.isTagFile,
- attrValue, c[0], n.getPrefix(), "_jspx_fnmap" );
- } else {
- attrValue = convertString(
- c[0], attrValue, attrName,
- handlerInfo.getPropertyEditorClass(attrName),
- true);
- }
-
- if (attrs[i].isDynamic()) {
- out.printin(tagHandlerVar);
- out.print(".");
- out.print("setDynamicAttribute(");
+ tagHandlerVar);
+ }
+ if (attrs[i].isDynamic()) {
+ out.printin(tagHandlerVar);
+ out.print(".");
+ out.print("setDynamicAttribute(");
String uri = attrs[i].getURI();
if( "".equals( uri ) || (uri == null) ) {
out.print( "null" );
@@ -2455,6 +2470,7 @@
else {
out.print("\"" + attrs[i].getURI() + "\"");
}
+
out.print(", \"");
out.print(attrs[i].getLocalName());
out.print("\", ");
@@ -2463,7 +2479,7 @@
} else {
out.printin(tagHandlerVar);
out.print(".");
- out.print(m.getName());
+
out.print(handlerInfo.getSetterMethod(attrs[i].getName()).getName());
out.print("(");
out.print(attrValue);
out.println(");");
1.40 +18 -3
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/Node.java
Index: Node.java
===================================================================
RCS file:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/Node.java,v
retrieving revision 1.39
retrieving revision 1.40
diff -u -r1.39 -r1.40
--- Node.java 8 Nov 2002 19:55:47 -0000 1.39
+++ Node.java 23 Nov 2002 01:36:49 -0000 1.40
@@ -1395,6 +1395,13 @@
private String uri;
private String localName;
private String value;
+ /**
+ * Value of the attribute after being proccessed, so that it
+ * represents a Java expression, and not arbitary statements.
+ * Currently only for CustomTag 's.
+ * TODO: Maybe it's a good idea that it should contain NO EL.
+ */
+ private String processedValue;
private boolean expression;
private boolean el;
private boolean dynamic;
@@ -1512,6 +1519,14 @@
*/
public boolean isDynamic() {
return dynamic;
+ }
+
+ public String getProcessedValue() {
+ return processedValue;
+ }
+
+ public void setProcessedValue(String pv) {
+ processedValue = pv;
}
}
1.1
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/TagPluginManager.java
Index: TagPluginManager.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/TagPluginManager.java,v
1.1 2002/11/23 01:36:49 kinman Exp $
* $Revision: 1.1 $
* $Date: 2002/11/23 01:36:49 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.compiler;
import java.util.*;
import java.io.*;
import org.apache.jasper.JasperException;
import org.apache.jasper.xmlparser.ParserUtils;
import org.apache.jasper.xmlparser.TreeNode;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.compiler.tagplugin.TagPlugin;
import org.apache.jasper.compiler.tagplugin.TagPluginFactory;
import org.apache.jasper.compiler.tagplugin.TagPluginContext;
/**
* Manages tag plugin optimizations.
* @author Kin-man Chung
*/
public class TagPluginManager {
static private final String plugInsXml = "tagPlugins.xml";
private boolean initialized = false;
private Hashtable tagPlugins = null;
private JspCompilationContext ctxt;
TagPluginManager(JspCompilationContext ctxt) {
this.ctxt = ctxt;
init();
}
private void init() {
if (initialized)
return;
InputStream is = ctxt.getResourceAsStream(plugInsXml);
if (is == null)
return;
TreeNode root = null;
try {
root = (new ParserUtils()).parseXMLDocument(plugInsXml, is);
} catch (JasperException ex) {
}
if (root == null)
return;
TreeNode tagPluginsNode = root.findChild("tag-plugins");
if (tagPluginsNode == null) {
// Error
return;
}
Iterator pluginList = tagPluginsNode.findChildren("tag-plugin");
while (pluginList.hasNext()) {
TreeNode pluginNode = (TreeNode) pluginList.next();
TreeNode tagClassNode = pluginNode.findChild("tag-class");
if (tagClassNode == null) {
// Error
return;
}
String tagClass = tagClassNode.getBody().trim();
TreeNode pluginClassNode = pluginNode.findChild("plugin-class");
if (pluginClassNode == null) {
// Error
return;
}
String pluginClassStr = pluginClassNode.getBody();
TagPlugin tagPlugin = null;
try {
Class pluginClass = Class.forName(pluginClassStr);
tagPlugin = (TagPlugin) pluginClass.newInstance();
} catch (ClassNotFoundException e) {
} catch (InstantiationException e) {
} catch (IllegalAccessException e) {
}
if (tagPlugin == null) {
return;
}
tagPlugins.put(tagClass, tagPlugin);
}
}
public TagPlugin getPlugInClass(Node.CustomTag n, ServletWriter out) {
if (tagPlugins == null) {
return null;
}
TagPluginFactory tagPluginFactory = (TagPluginFactory)
tagPlugins.get(n.getTagHandlerClass().getName());
if (tagPluginFactory == null) {
return null;
}
TagPluginContext tagPluginContext = new TagPluginContextImpl(n, out);
return tagPluginFactory.createTagPlugin(n.getName(), tagPluginContext);
}
static class TagPluginContextImpl implements TagPluginContext {
Node.CustomTag node;
ServletWriter out;
TagPluginContextImpl(Node.CustomTag n, ServletWriter out) {
this.node = n;
this.out = out;
}
public ServletWriter getServletWriter() {
return out;
}
public boolean isScriptless() {
return node.getChildInfo().isScriptless();
}
public String getAttributeValue(String attribute) {
Node.JspAttribute[] attrs = node.getJspAttributes();
for (int i=0; i < attrs.length; i++) {
if (attrs[i].getName().equals(attribute)) {
return attrs[i].getProcessedValue();
}
}
return null;
}
}
}
1.1
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPlugin.java
Index: TagPlugin.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPlugin.java,v
1.1 2002/11/23 01:36:49 kinman Exp $
* $Revision: 1.1 $
* $Date: 2002/11/23 01:36:49 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.compiler.tagplugin;
/**
* This interface is to be implemented by the plugin author, to supply
* an alternate implementation of the tag handlers. Used to specify
* the Java codes that need to be generated when a tag is referenced.
*/
public interface TagPlugin {
/**
* Invoked to generate Java codes at the start of a custom tag.
*/
void atSTag();
/**
* Invoked to generate Java codes at the end of a custom tag.
*/
void atETag();
}
1.1
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPluginContext.java
Index: TagPluginContext.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPluginContext.java,v
1.1 2002/11/23 01:36:49 kinman Exp $
* $Revision: 1.1 $
* $Date: 2002/11/23 01:36:49 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.compiler.tagplugin;
import org.apache.jasper.compiler.ServletWriter;
/**
* This interface allows the plugin author to query about the properties
* of the current tag, and to use Jasper resources, such as ServletWriter.
*/
public interface TagPluginContext {
/**
* @return true if the body of the tag is scriptless.
*/
boolean isScriptless();
/**
* Get the evaluated value of the given attribute for the current tag
* @return null if the attribute is not specified, or a java expression
* that when evaluateed, represent the attribute value
*/
String getAttributeValue(String attribute);
/**
* Used for outputting Java fragments to the output stream.
*/
ServletWriter getServletWriter();
}
1.1
jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPluginFactory.java
Index: TagPluginFactory.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-jasper/jasper2/src/share/org/apache/jasper/compiler/tagplugin/TagPluginFactory.java,v
1.1 2002/11/23 01:36:49 kinman Exp $
* $Revision: 1.1 $
* $Date: 2002/11/23 01:36:49 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.compiler.tagplugin;
/**
* This interface is to be implemented by the plugin, to supply
* an alternate implementation of the tag handlers. Used for create
* an instance of a TagPlugin.
*/
public interface TagPluginFactory {
/**
* Invoked at the beginning of a custom tag. Used to create a
* TagPlugin object for the tag.
* @param tagName The name of the current tag
* @param tpContext A TagPlugContext created by Jasper containing context
* informantion about the tag under compilation
* @return a TagPlugin for the current tag, or a false if the plugin
* cannot be found or created and that Jasper should generate
* Tag API's as usual.
*/
TagPlugin createTagPlugin(String tagName, TagPluginContext tpContext);
}
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