com.sun.xml.bind.GrammarImpl Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.xml.bind;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ExpressionPool;
import com.sun.msv.grammar.Grammar;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.OtherExp;
import com.sun.msv.grammar.trex.ElementPattern;
/**
* Implementation of the {@link Grammar} interface with "plugs"
* that allows a grammar to be connected to other grammars
* when assembled through the context path.
*
*
* These classes will be freeze-dried to "bgm.ser", so they must be
* serializable.
*
*
* This class also implements a trick to allow a large grammar
* to be serialized without causing a stack overflow error.
* This is done by modifying the {@link ElementExp#contentModel} field
* to {@link Expression#nullSet} in the serialized form.
* The correct references will be restored after the grammar is
* deserialized.
*
* @since 1.0
* @author
* Kohsuke Kawaguchi ([email protected])
*/
public class GrammarImpl implements Grammar, Serializable {
private Expression topLevel;
private final ExpressionPool pool;
private Plug[] plugs;
/**
* The content model of elements. Keyed by {@link ElementPattern}
* to its content model.
*
* @since 1.0.3
*/
private final Map elementContents = new HashMap();
public GrammarImpl( ExpressionPool pool ) {
this.pool = pool;
}
public void setPlugs( Plug[] plugs ) {
this.plugs = plugs;
}
public void setTopLevel( Expression topLevel ) {
this.topLevel = topLevel;
}
public Expression getTopLevel() { return topLevel; }
public ExpressionPool getPool() { return pool; }
/**
* Connect this grammar to other grammars.
*/
public void connect( Grammar[] others ) {
for( int i=0; i
* While the other ordinary {@link ElementExp}s can be also used,
* this {@link ElementExp} allows the grammar to be serialized without
* too much recursion.
*/
public ElementPattern createElement( NameClass nc, Expression contentModel ) {
ElementPattern p = new ElementPattern(nc,contentModel);
elementContents.put(p,contentModel);
return p;
}
private void writeObject( ObjectOutputStream oos ) throws IOException {
// update the content model table.
for( Iterator itr=elementContents.entrySet().iterator(); itr.hasNext(); ) {
Map.Entry e = (Map.Entry)itr.next();
ElementExp exp = (ElementExp)e.getKey();
e.setValue( exp.contentModel );
exp.contentModel = Expression.nullSet; // cut the reference while serializing the graph
}
oos.defaultWriteObject();
// restore the references
for( Iterator itr=elementContents.entrySet().iterator(); itr.hasNext(); ) {
Map.Entry e = (Map.Entry)itr.next();
ElementExp exp = (ElementExp)e.getKey();
exp.contentModel = (Expression)e.getValue();
}
}
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
ois.defaultReadObject();
// restore the references
if( elementContents!=null ) {
for( Iterator itr=elementContents.entrySet().iterator(); itr.hasNext(); ) {
Map.Entry e = (Map.Entry)itr.next();
ElementExp exp = (ElementExp)e.getKey();
exp.contentModel = (Expression)e.getValue();
}
}
}
/**
* Inter-grammar connection that needs be bound.
* The connection mechanism will be implemented in derived classes.
*
* @author
* Kohsuke Kawaguchi ([email protected])
*/
public static abstract class Plug extends OtherExp implements Serializable {
/**
* Called to connect a grammar to other grammars
* after each package-level GrammarInfo is loaded.
*
* The callee should fill in the exp field of the
* current object.
*
* The connect method can be called multiple times.
*
* @param pool
* this object can be used by callee to create new expression
* objects if necessary
*/
public abstract void connect( ExpressionPool pool, Grammar[] others );
// serialization support
private static final long serialVersionUID = 1;
}
// serialization support
private static final long serialVersionUID = 1;
}