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This is the delayed-task creation helper. It's a clened-up 

version of ProjectHelperImpl from embed, with all other extensions
removed. I also removed all code that supported the old eval
mode ( which reduced the size in 1/2 )


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273653 13f79535-47bb-0310-9956-ffa450edef68
master
Costin Manolache 22 years ago
parent
62829095c1
commit
72b95057fa
1 changed files with 899 additions and 0 deletions
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      src/main/org/apache/tools/ant/helper/ProjectHelper2.java

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/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2002 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", "Ant", 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 apache@apache.org.
*
* 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.tools.ant.helper;

import org.apache.tools.ant.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Stack;

import org.xml.sax.Locator;
import org.xml.sax.InputSource;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXException;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.DefaultHandler;

import org.apache.tools.ant.util.JAXPUtils;
import org.apache.tools.ant.util.FileUtils;

/**
* Sax2 based project reader
*
* @author duncan@x180.com
* @author Costin Manolache
*/
public class ProjectHelper2 extends ProjectHelper {
/* Stateless */

// singletons - since all state is in the context
static AntHandler elementHandler=new ElementHandler();
static AntHandler targetHandler=new TargetHandler();
static AntHandler mainHandler=new MainHandler();
static AntHandler projectHandler=new ProjectHandler();

/**
* helper for path -> URI and URI -> path conversions.
*/
private static FileUtils fu = FileUtils.newFileUtils();

public void parse(Project project, Object source)
throws BuildException
{
AntXmlContext context=new AntXmlContext(project, this);
project.addReference( "ant.parsing.context", context );

parse(project, source,new RootHandler(context));

// Execute the top-level target
context.implicitTarget.execute();
}

/**
* Parses the project file, configuring the project as it goes.
*
* @exception org.apache.tools.ant.BuildException if the configuration is invalid or cannot
* be read
*/
public void parse(Project project, Object source, RootHandler handler)
throws BuildException
{
AntXmlContext context=handler.context;

if(source instanceof File) {
context.buildFile=(File)source;
// } else if( source instanceof InputStream ) {
// } else if( source instanceof URL ) {
// } else if( source instanceof InputSource ) {
} else {
throw new BuildException( "Source " + source.getClass().getName() +
" not supported by this plugin" );
}

FileInputStream inputStream = null;
InputSource inputSource = null;

context.buildFile = new File(context.buildFile.getAbsolutePath());
context.buildFileParent = new File(context.buildFile.getParent());
try {
/**
* SAX 2 style parser used to parse the given file.
*/
context.parser =JAXPUtils.getXMLReader();

String uri = fu.toURI(context.buildFile.getAbsolutePath());

inputStream = new FileInputStream(context.buildFile);
inputSource = new InputSource(inputStream);
inputSource.setSystemId(uri);
project.log("parsing buildfile " + context.buildFile + " with URI = " + uri, Project.MSG_VERBOSE);

DefaultHandler hb = handler;

context.parser.setContentHandler(hb);
context.parser.setEntityResolver(hb);
context.parser.setErrorHandler(hb);
context.parser.setDTDHandler(hb);
context.parser.parse(inputSource);
} catch(SAXParseException exc) {
Location location =
new Location(exc.getSystemId(), exc.getLineNumber(), exc.getColumnNumber());

Throwable t = exc.getException();
if (t instanceof BuildException) {
BuildException be = (BuildException) t;
if (be.getLocation() == Location.UNKNOWN_LOCATION) {
be.setLocation(location);
}
throw be;
}
throw new BuildException(exc.getMessage(), t, location);
}
catch(SAXException exc) {
Throwable t = exc.getException();
if (t instanceof BuildException) {
throw (BuildException) t;
}
throw new BuildException(exc.getMessage(), t);
}
catch(FileNotFoundException exc) {
throw new BuildException(exc);
}
catch(UnsupportedEncodingException exc) {
throw new BuildException("Encoding of project file is invalid.",exc);
}
catch(IOException exc) {
throw new BuildException("Error reading project file: " +exc.getMessage(), exc);
}
finally {
if (inputStream != null) {
try {
inputStream.close();
}
catch (IOException ioe) {
// ignore this
}
}
}
}

/**
* The common superclass for all SAX event handlers used to parse
* the configuration file.
*
* The context will hold all state information. At each time
* there is one active handler for the current element. It can
* use onStartChild() to set an alternate handler for the child.
*/
public static class AntHandler {
/**
* Handles the start of an element. This base implementation does nothing.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if this method is not overridden, or in
* case of error in an overridden version
*/
public void onStartElement(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
}

/**
* Handles the start of an element. This base implementation just
* throws an exception - you must override this method if you expect
* child elements.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if this method is not overridden, or in
* case of error in an overridden version
*/
public AntHandler onStartChild(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
throw new SAXParseException("Unexpected element \"" + qname + " \"", context.locator);
}

public void onEndChild(String uri, String tag, String qname,
AntXmlContext context)
throws SAXParseException
{
}

/**
* Called when this element and all elements nested into it have been
* handled (i.e. at the </end_tag_of_the_element> ).
*/
public void onEndElement(String uri, String tag, AntXmlContext context) {
}

/**
* Handles text within an element. This base implementation just
* throws an exception, you must override it if you expect content.
*
* @param buf A character array of the text within the element.
* Will not be <code>null</code>.
* @param start The start element in the array.
* @param count The number of characters to read from the array.
*
* @exception org.xml.sax.SAXParseException if this method is not overridden, or in
* case of error in an overridden version
*/
public void characters(char[] buf, int start, int count, AntXmlContext context)
throws SAXParseException
{
String s = new String(buf, start, count).trim();

if (s.length() > 0) {
throw new SAXParseException("Unexpected text \"" + s + "\"", context.locator);
}
}

/** Will be called every time a namespace is reached.
It'll verify if the ns was processed, and if not load the task definitions.
*/
protected void checkNamespace( String uri ) {
}
}

/** Context information for the ant processing.
*/
public static class AntXmlContext {
/** The project to configure. */
public Project project;

/** The configuration file to parse. */
public File buildFile;

/**
* Parent directory of the build file. Used for resolving entities
* and setting the project's base directory.
*/
public File buildFileParent;

/** Name of the current project */
public String currentProjectName;

/**
* Locator for the configuration file parser.
* Used for giving locations of errors etc.
*/
public Locator locator;

// Do we need those ?
public ProjectHelper2 helper;

org.xml.sax.XMLReader parser;

/**
* Target that all other targets will depend upon implicitly.
*
* <p>This holds all tasks and data type definitions that have
* been placed outside of targets.</p>
*/
public Target implicitTarget = new Target();

/** Current target ( no need for a stack as the processing model
allows only one level of target ) */
public Target currentTarget=null;

/** The stack of RuntimeConfigurable2 wrapping the
objects.
*/
public Vector wStack=new Vector();

public Hashtable namespaces=new Hashtable();
// Import stuff
public boolean ignoreProjectTag=false;
public Hashtable importedFiles = new Hashtable();
public int importlevel = 0;

public AntXmlContext(Project project, ProjectHelper2 helper) {
this.project=project;
implicitTarget.setName("");
this.helper=helper;
}

public Project getProject() {
return project;
}

public RuntimeConfigurable currentWrapper() {
if( wStack.size() < 1 ) return null;
return (RuntimeConfigurable)wStack.elementAt( wStack.size() - 1 );
}

public RuntimeConfigurable parentWrapper() {
if( wStack.size() < 2 ) return null;
return (RuntimeConfigurable)wStack.elementAt( wStack.size() - 2 );
}

public void pushWrapper( RuntimeConfigurable wrapper ) {
wStack.addElement(wrapper);
}

public void popWrapper() {
if( wStack.size() > 0 )
wStack.removeElementAt( wStack.size() - 1 );
}

public Vector getWrapperStack() {
return wStack;
}
/**
* Scans an attribute list for the <code>id</code> attribute and
* stores a reference to the target object in the project if an
* id is found.
* <p>
* This method was moved out of the configure method to allow
* it to be executed at parse time.
*
* @see #configure(java.lang.Object,org.xml.sax.AttributeList,org.apache.tools.ant.Project)
*/
public void configureId(Object element, Attributes attr) {
String id = attr.getValue("id");
if (id != null) {
project.addReference(id, element);
}
}

}
/**
* Handler for ant processing. Uses a stack of AntHandlers to
* implement each element ( the original parser used a recursive behavior,
* with the implicit execution stack )
*/
public static class RootHandler extends DefaultHandler {
private Stack antHandlers=new Stack();
private AntHandler currentHandler=null;
private AntXmlContext context;
public RootHandler(AntXmlContext context) {
currentHandler=ProjectHelper2.mainHandler;
antHandlers.push( currentHandler );
this.context=context;
}
/**
* Resolves file: URIs relative to the build file.
*
* @param publicId The public identifer, or <code>null</code>
* if none is available. Ignored in this
* implementation.
* @param systemId The system identifier provided in the XML
* document. Will not be <code>null</code>.
*/
public InputSource resolveEntity(String publicId,
String systemId) {
context.getProject().log("resolving systemId: " +
systemId, Project.MSG_VERBOSE);
if (systemId.startsWith("file:")) {
String path = fu.fromURI(systemId);

File file = new File(path);
if (!file.isAbsolute()) {
file = fu.resolveFile(context.buildFileParent, path);
}
try {
InputSource inputSource =
new InputSource(new FileInputStream(file));
inputSource.setSystemId(fu.toURI(file.getAbsolutePath()));
return inputSource;
} catch (FileNotFoundException fne) {
context.project.log(file.getAbsolutePath() +
" could not be found", Project.MSG_WARN);
}

}
// use default if not file or file not found
return null;
}

/**
* Handles the start of a project element. A project handler is created
* and initialised with the element name and attributes.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if the tag given is not
* <code>"project"</code>
*/
public void startElement(String uri, String tag, String qname, Attributes attrs)
throws SAXParseException
{
AntHandler next=currentHandler.onStartChild(uri, tag, qname, attrs, context);
antHandlers.push( currentHandler );
currentHandler=next;
currentHandler.onStartElement( uri, tag, qname, attrs, context );
}

/**
* Sets the locator in the project helper for future reference.
*
* @param locator The locator used by the parser.
* Will not be <code>null</code>.
*/
public void setDocumentLocator(Locator locator) {
context.locator = locator;
}

/**
* Handles the end of an element. Any required clean-up is performed
* by the onEndElement() method and then the original handler is restored to
* the parser.
*
* @param name The name of the element which is ending.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXException in case of error (not thrown in
* this implementation)
*
*/
public void endElement(String uri, String name, String qName) throws SAXException {
currentHandler.onEndElement(uri, name, context);
AntHandler prev=(AntHandler)antHandlers.pop();
currentHandler=prev;
if( currentHandler!=null )
currentHandler.onEndChild( uri, name, qName, context );
}

public void characters(char[] buf, int start, int count)
throws SAXParseException
{
currentHandler.characters( buf, start, count, context );
}
}

public static class MainHandler extends AntHandler {

public AntHandler onStartChild(String uri, String name, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
if (qname.equals("project")) {
return ProjectHelper2.projectHandler;
} else {
// if( context.importlevel > 0 ) {
// // we are in an imported file. Allow top-level <target>.
// if( qname.equals( "target" ) )
// return ProjectHelper2.targetHandler;
// }
throw new SAXParseException("Unexpected element \"" + qname + "\" " + name, context.locator);
}
}
}
/**
* Handler for the top level "project" element.
*/
public static class ProjectHandler extends AntHandler {
/**
* Initialisation routine called after handler creation
* with the element name and attributes. The attributes which
* this handler can deal with are: <code>"default"</code>,
* <code>"name"</code>, <code>"id"</code> and <code>"basedir"</code>.
*
* @param tag Name of the element which caused this handler
* to be created. Should not be <code>null</code>.
* Ignored in this implementation.
* @param attrs Attributes of the element which caused this
* handler to be created. Must not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if an unexpected attribute is
* encountered or if the <code>"default"</code> attribute
* is missing.
*/
public void onStartElement(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
String id = null;
String baseDir = null;

Project project=context.getProject();

for (int i = 0; i < attrs.getLength(); i++) {
String key = attrs.getQName(i);
String value = attrs.getValue(i);
if (key.equals("default")) {
if ( value != null && !value.equals("")) {
if( !context.ignoreProjectTag )
project.setDefaultTarget(value);
}
} else if (key.equals("name")) {
if (value != null) {
context.currentProjectName=value;

if( !context.ignoreProjectTag ) {
project.setName(value);
project.addReference(value, project);
}
}
} else if (key.equals("id")) {
if (value != null) {
// What's the difference between id and name ?
if( !context.ignoreProjectTag ) {
project.addReference(value, project);
}
}
} else if (key.equals("basedir")) {
if( !context.ignoreProjectTag )
baseDir = value;
} else {
// XXX ignore attributes in a different NS ( maybe store them ? )
throw new SAXParseException("Unexpected attribute \"" + attrs.getQName(i) + "\"", context.locator);
}
}

if( context.ignoreProjectTag ) {
// no further processing
return;
}
// set explicitely before starting ?
if (project.getProperty("basedir") != null) {
project.setBasedir(project.getProperty("basedir"));
} else {
// Default for baseDir is the location of the build file.
if (baseDir == null) {
project.setBasedir(context.buildFileParent.getAbsolutePath());
} else {
// check whether the user has specified an absolute path
if ((new File(baseDir)).isAbsolute()) {
project.setBasedir(baseDir);
} else {
project.setBaseDir(project.resolveFile(baseDir,
context.buildFileParent));
}
}
}
project.addTarget("", context.implicitTarget);
context.currentTarget=context.implicitTarget;
}

/**
* Handles the start of a top-level element within the project. An
* appropriate handler is created and initialised with the details
* of the element.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if the tag given is not
* <code>"taskdef"</code>, <code>"typedef"</code>,
* <code>"property"</code>, <code>"target"</code>
* or a data type definition
*/
public AntHandler onStartChild(String uri, String name, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
if (qname.equals("target")) {
return ProjectHelper2.targetHandler;
} else {
return ProjectHelper2.elementHandler;
}
}

}

/**
* Handler for "target" elements.
*/
public static class TargetHandler extends AntHandler {

/**
* Initialisation routine called after handler creation
* with the element name and attributes. The attributes which
* this handler can deal with are: <code>"name"</code>,
* <code>"depends"</code>, <code>"if"</code>,
* <code>"unless"</code>, <code>"id"</code> and
* <code>"description"</code>.
*
* @param tag Name of the element which caused this handler
* to be created. Should not be <code>null</code>.
* Ignored in this implementation.
* @param attrs Attributes of the element which caused this
* handler to be created. Must not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if an unexpected attribute is encountered
* or if the <code>"name"</code> attribute is missing.
*/
public void onStartElement(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
String name = null;
String depends = "";

Project project=context.getProject();
Target target = new Target();
context.currentTarget=target;

for (int i = 0; i < attrs.getLength(); i++) {
String key = attrs.getQName(i);
String value = attrs.getValue(i);

if (key.equals("name")) {
name = value;
if( "".equals( name ) )
throw new BuildException("name attribute must not be empty");
} else if (key.equals("depends")) {
depends = value;
} else if (key.equals("if")) {
target.setIf(value);
} else if (key.equals("unless")) {
target.setUnless(value);
} else if (key.equals("id")) {
if (value != null && !value.equals("")) {
context.getProject().addReference(value, target);
}
} else if (key.equals("description")) {
target.setDescription(value);
} else {
throw new SAXParseException("Unexpected attribute \"" + key + "\"", context.locator);
}
}

if (name == null) {
throw new SAXParseException("target element appears without a name attribute",
context.locator);
}
Hashtable currentTargets = project.getTargets();

// If the name has already beend defined ( import for example )
if(currentTargets.containsKey(name)) {
// Alter the name.
if( context.currentProjectName != null ) {
String newName=context.currentProjectName + "." + name;
project.log("Already defined in main or a previous import, define "
+ name + " as " + newName,
Project.MSG_VERBOSE);
name=newName;
} else {
project.log("Already defined in main or a previous import, ignore "
+ name,
Project.MSG_VERBOSE);
name=null;
}
}

if( name != null ) {
target.setName(name);
project.addOrReplaceTarget(name, target);
}

// take care of dependencies
if (depends.length() > 0) {
target.setDepends(depends);
}
}

/**
* Handles the start of an element within a target.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if an error occurs when initialising
* the appropriate child handler
*/
public AntHandler onStartChild(String uri, String name, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
return ProjectHelper2.elementHandler;
}
public void onEndElement(String uri, String tag, AntXmlContext context) {
context.currentTarget=context.implicitTarget;
}
}

/**
* Handler for all project elements ( tasks, data types )
*/
public static class ElementHandler extends AntHandler {

/**
* Constructor.
*/
public ElementHandler() {
}

/**
* Initialisation routine called after handler creation
* with the element name and attributes. This configures
* the element with its attributes and sets it up with
* its parent container (if any). Nested elements are then
* added later as the parser encounters them.
*
* @param tag Name of the element which caused this handler
* to be created. Must not be <code>null</code>.
*
* @param attrs Attributes of the element which caused this
* handler to be created. Must not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException in case of error (not thrown in
* this implementation)
*/
public void onStartElement(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
RuntimeConfigurable parentWrapper=context.currentWrapper();
RuntimeConfigurable wrapper=null;

/* UnknownElement is used for tasks and data types - with
delayed eval */
UnknownElement task= new UnknownElement(qname);
task.setProject(context.getProject());
//XXX task.setTaskType(qname);

task.setTaskName(qname);

Location location=new Location(context.locator.getSystemId(),
context.locator.getLineNumber(),
context.locator.getColumnNumber());
task.setLocation(location);
task.setOwningTarget(context.currentTarget);

context.configureId(task, attrs);

Object parent=null;
if( parentWrapper!=null ) {
parent=parentWrapper.getProxy();
}

if( parent != null ) {
// Nested element
((UnknownElement)parent).addChild( task );
} else {
// Task included in a target ( including the default one ).
context.currentTarget.addTask( task );
}

// container.addTask(task);
// This is a nop in UE: task.init();

wrapper=new RuntimeConfigurable( task, task.getTaskName());
wrapper.setAttributes2(attrs);

if (parentWrapper != null) {
parentWrapper.addChild(wrapper);
}

context.pushWrapper( wrapper );
}

/**
* Adds text to the task, using the wrapper
*
* @param buf A character array of the text within the element.
* Will not be <code>null</code>.
* @param start The start element in the array.
* @param count The number of characters to read from the array.
*
* @exception org.xml.sax.SAXParseException if the element doesn't support text
*
* @see org.apache.tools.ant.ProjectHelper#addText(org.apache.tools.ant.Project,java.lang.Object,char[],int,int)
*/
public void characters(char[] buf, int start, int count,
AntXmlContext context)
throws SAXParseException
{
RuntimeConfigurable wrapper=context.currentWrapper();
wrapper.addText(buf, start, count);
}
/**
* Handles the start of an element within a target. Task containers
* will always use another task handler, and all other tasks
* will always use a nested element handler.
*
* @param tag The name of the element being started.
* Will not be <code>null</code>.
* @param attrs Attributes of the element being started.
* Will not be <code>null</code>.
*
* @exception org.xml.sax.SAXParseException if an error occurs when initialising
* the appropriate child handler
*/
public AntHandler onStartChild(String uri, String tag, String qname,
Attributes attrs,
AntXmlContext context)
throws SAXParseException
{
// this element
RuntimeConfigurable wrapper=context.currentWrapper();
Object element=wrapper.getProxy();
// return ProjectHelper2.nestedElementHandler;
return ProjectHelper2.elementHandler;
}

public void onEndElement(String uri, String tag, AntXmlContext context) {
context.popWrapper();
}

public void onEndChild(String uri, String tag, String qname,
AntXmlContext context)
throws SAXParseException
{
}
}
}

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