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Java example source code file (NGCCInterleaveFilter.java)
This example Java source code file (NGCCInterleaveFilter.java) is included in the alvinalexander.com
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Learn more about this Java project at its project page.
The NGCCInterleaveFilter.java Java example source code
/*
* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.xml.internal.xsom.impl.parser.state;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Dispatches incoming events into sub handlers appropriately
* so that the interleaving semantics will be correctly realized.
*
* @author Kohsuke Kawaguchi (kk@kohsuke.org)
*/
public abstract class NGCCInterleaveFilter implements NGCCEventSource, NGCCEventReceiver {
protected NGCCInterleaveFilter( NGCCHandler parent, int cookie ) {
this._parent = parent;
this._cookie = cookie;
}
protected void setHandlers( NGCCEventReceiver[] receivers ) {
this._receivers = receivers;
}
/** event receiverse. */
protected NGCCEventReceiver[] _receivers;
public int replace(NGCCEventReceiver oldHandler, NGCCEventReceiver newHandler) {
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]==oldHandler ) {
_receivers[i]=newHandler;
return i;
}
throw new InternalError(); // a bug in RelaxNGCC.
}
/** Parent handler. */
private final NGCCHandler _parent;
/** Cookie given by the parent. */
private final int _cookie;
//
//
// event handler
//
//
/**
* Receiver that is being locked and therefore receives all the events.
* <pre><![CDATA[
* <interleave>
* <element name="foo"/>
* <element name="bar">
* <element name="foo"/>
* </element>
* </interlaeve>
* </xmp></pre>
* When processing inside the bar element, this receiver is
* "locked" so that it can correctly receive its child foo element.
*/
private int lockedReceiver;
/**
* Nest level. Lock will be release when the lockCount becomes 0.
*/
private int lockCount=0;
public void enterElement(
String uri, String localName, String qname,Attributes atts) throws SAXException {
if(isJoining) return; // ignore any token if we are joining. See joinByXXXX.
if(lockCount++==0) {
lockedReceiver = findReceiverOfElement(uri,localName);
if(lockedReceiver==-1) {
// we can't process this token. join.
joinByEnterElement(null,uri,localName,qname,atts);
return;
}
}
_receivers[lockedReceiver].enterElement(uri,localName,qname,atts);
}
public void leaveElement(String uri, String localName, String qname) throws SAXException {
if(isJoining) return; // ignore any token if we are joining. See joinByXXXX.
if( lockCount-- == 0 )
joinByLeaveElement(null,uri,localName,qname);
else
_receivers[lockedReceiver].leaveElement(uri,localName,qname);
}
public void enterAttribute(String uri, String localName, String qname) throws SAXException {
if(isJoining) return; // ignore any token if we are joining. See joinByXXXX.
if(lockCount++==0) {
lockedReceiver = findReceiverOfAttribute(uri,localName);
if(lockedReceiver==-1) {
// we can't process this token. join.
joinByEnterAttribute(null,uri,localName,qname);
return;
}
}
_receivers[lockedReceiver].enterAttribute(uri,localName,qname);
}
public void leaveAttribute(String uri, String localName, String qname) throws SAXException {
if(isJoining) return; // ignore any token if we are joining. See joinByXXXX.
if( lockCount-- == 0 )
joinByLeaveAttribute(null,uri,localName,qname);
else
_receivers[lockedReceiver].leaveAttribute(uri,localName,qname);
}
public void text(String value) throws SAXException {
if(isJoining) return; // ignore any token if we are joining. See joinByXXXX.
if(lockCount!=0)
_receivers[lockedReceiver].text(value);
else {
int receiver = findReceiverOfText();
if(receiver!=-1) _receivers[receiver].text(value);
else joinByText(null,value);
}
}
/**
* Implemented by the generated code to determine the handler
* that can receive the given element.
*
* @return
* Thread ID of the receiver that can handle this event,
* or -1 if none.
*/
protected abstract int findReceiverOfElement( String uri, String local );
/**
* Returns the handler that can receive the given attribute, or null.
*/
protected abstract int findReceiverOfAttribute( String uri, String local );
/**
* Returns the handler that can receive text events, or null.
*/
protected abstract int findReceiverOfText();
//
//
// join method
//
//
/**
* Set to true when this handler is in the process of
* joining all branches.
*/
private boolean isJoining = false;
/**
* Joins all the child receivers.
*
* <p>
* This method is called by a child receiver when it sees
* something that it cannot handle, or by this object itself
* when it sees an event that it can't process.
*
* <p>
* This method forces children to move to its final state,
* then revert to the parent.
*
* @param source
* If this method is called by one of the child receivers,
* the receiver object. If this method is called by itself,
* null.
*/
public void joinByEnterElement( NGCCEventReceiver source,
String uri, String local, String qname, Attributes atts ) throws SAXException {
if(isJoining) return; // we are already in the process of joining. ignore.
isJoining = true;
// send special token to the rest of the branches.
// these branches don't understand this token, so they will
// try to move to a final state and send the token back to us,
// which this object will ignore (because isJoining==true)
// Otherwise branches will find an error.
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]!=source )
_receivers[i].enterElement(uri,local,qname,atts);
// revert to the parent
_parent._source.replace(this,_parent);
_parent.onChildCompleted(null,_cookie,true);
// send this event to the parent
_parent.enterElement(uri,local,qname,atts);
}
public void joinByLeaveElement( NGCCEventReceiver source,
String uri, String local, String qname ) throws SAXException {
if(isJoining) return; // we are already in the process of joining. ignore.
isJoining = true;
// send special token to the rest of the branches.
// these branches don't understand this token, so they will
// try to move to a final state and send the token back to us,
// which this object will ignore (because isJoining==true)
// Otherwise branches will find an error.
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]!=source )
_receivers[i].leaveElement(uri,local,qname);
// revert to the parent
_parent._source.replace(this,_parent);
_parent.onChildCompleted(null,_cookie,true);
// send this event to the parent
_parent.leaveElement(uri,local,qname);
}
public void joinByEnterAttribute( NGCCEventReceiver source,
String uri, String local, String qname ) throws SAXException {
if(isJoining) return; // we are already in the process of joining. ignore.
isJoining = true;
// send special token to the rest of the branches.
// these branches don't understand this token, so they will
// try to move to a final state and send the token back to us,
// which this object will ignore (because isJoining==true)
// Otherwise branches will find an error.
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]!=source )
_receivers[i].enterAttribute(uri,local,qname);
// revert to the parent
_parent._source.replace(this,_parent);
_parent.onChildCompleted(null,_cookie,true);
// send this event to the parent
_parent.enterAttribute(uri,local,qname);
}
public void joinByLeaveAttribute( NGCCEventReceiver source,
String uri, String local, String qname ) throws SAXException {
if(isJoining) return; // we are already in the process of joining. ignore.
isJoining = true;
// send special token to the rest of the branches.
// these branches don't understand this token, so they will
// try to move to a final state and send the token back to us,
// which this object will ignore (because isJoining==true)
// Otherwise branches will find an error.
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]!=source )
_receivers[i].leaveAttribute(uri,local,qname);
// revert to the parent
_parent._source.replace(this,_parent);
_parent.onChildCompleted(null,_cookie,true);
// send this event to the parent
_parent.leaveAttribute(uri,local,qname);
}
public void joinByText( NGCCEventReceiver source,
String value ) throws SAXException {
if(isJoining) return; // we are already in the process of joining. ignore.
isJoining = true;
// send special token to the rest of the branches.
// these branches don't understand this token, so they will
// try to move to a final state and send the token back to us,
// which this object will ignore (because isJoining==true)
// Otherwise branches will find an error.
for( int i=0; i<_receivers.length; i++ )
if( _receivers[i]!=source )
_receivers[i].text(value);
// revert to the parent
_parent._source.replace(this,_parent);
_parent.onChildCompleted(null,_cookie,true);
// send this event to the parent
_parent.text(value);
}
//
//
// event dispatching methods
//
//
public void sendEnterAttribute( int threadId,
String uri, String local, String qname) throws SAXException {
_receivers[threadId].enterAttribute(uri,local,qname);
}
public void sendEnterElement( int threadId,
String uri, String local, String qname, Attributes atts) throws SAXException {
_receivers[threadId].enterElement(uri,local,qname,atts);
}
public void sendLeaveAttribute( int threadId,
String uri, String local, String qname) throws SAXException {
_receivers[threadId].leaveAttribute(uri,local,qname);
}
public void sendLeaveElement( int threadId,
String uri, String local, String qname) throws SAXException {
_receivers[threadId].leaveElement(uri,local,qname);
}
public void sendText(int threadId, String value) throws SAXException {
_receivers[threadId].text(value);
}
}
</pre>
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