/*
* @(#)$Id: TREXIslandVerifier.java 1634 2004-04-05 17:42:28Z kohsuke $
*
* Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
package com.sun.msv.relaxns.verifier;
import java.util.Map;
import java.util.Set;
import java.util.Vector;
import org.iso_relax.dispatcher.Dispatcher;
import org.iso_relax.dispatcher.ElementDecl;
import org.iso_relax.dispatcher.IslandSchema;
import org.iso_relax.dispatcher.IslandVerifier;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.relaxns.grammar.ExternalElementExp;
import com.sun.msv.relaxns.grammar.relax.AnyOtherElementExp;
import com.sun.msv.verifier.regexp.ComplexAcceptor;
import com.sun.msv.verifier.regexp.REDocumentDeclaration;
import com.sun.msv.verifier.regexp.SimpleAcceptor;
/**
* IslandVerifier for RELAX Core and TREX.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
class TREXIslandVerifier
extends com.sun.msv.verifier.Verifier
implements org.iso_relax.dispatcher.IslandVerifier
{
protected Dispatcher dispatcher;
public void setDispatcher( Dispatcher disp ) {
this.dispatcher = disp;
this.errorHandler = new ErrorHandlerAdaptor( disp );
}
/**
* lazily constructed map from Rule object to ExternalElementExp.
*
* Rule object <code>r</code> and ExternalElementExp whose rule field
* is <code>r</code> are registered to this map when child island is found.
*
* this map is used in endChildIsland method.
*/
protected final Map rule2exp = new java.util.HashMap();
TREXIslandVerifier( RulesAcceptor initialAcceptor ) {
super( null, null ); // quick hack.
current = initialAcceptor;
}
public void startElement( String namespaceUri, String localName, String qName, Attributes atts )
throws SAXException {
super.startElement(namespaceUri,localName,qName,atts);
// check current Acceptor object to see if switching is necessary.
if( current instanceof SimpleAcceptor ) {
SimpleAcceptor sa = (SimpleAcceptor)current;
// if sa.owner==null, we are in error recovery mode.
// so don't let another IslandVerifier kick in.
// just continue validation by using the current handler.
if( sa.owner instanceof ExternalElementExp ) {
// switch to the child island.
switchToChildIsland( new ExternalElementExp[]{(ExternalElementExp)sa.owner}, namespaceUri, localName, qName, atts );
return;
}
if( sa.owner instanceof AnyOtherElementExp ) {
// switch to anyOtherElement.
switchToAnyOtherElement( new AnyOtherElementExp[]{(AnyOtherElementExp)sa.owner}, namespaceUri, localName, qName, atts );
return;
}
return;
}
if( current instanceof ComplexAcceptor ) {
ComplexAcceptor ca = (ComplexAcceptor)current;
Vector vec = null;
for( int i=0; i<ca.owners.length; i++ )
if( ca.owners[i] instanceof ExternalElementExp ) {
// bingo
if(vec==null) vec=new Vector();
vec.add( ca.owners[i] );
}
// ExternalElementExp can be mixed with normal ElementExps.
// e.g., TREX:
// <choice>
// <import label="..." namespace="..." /> <!-- import -->
// <element><anyName /> ... </element>
// </choice>
// Even if this is the case, this implementation switches to
// the new child Verifier. Therefore
// <element><anyName /> ... </element>
// won't be used.
if( vec!=null ) {
// switch to the child island.
ExternalElementExp[] exps = new ExternalElementExp[vec.size()];
vec.toArray(exps);
switchToChildIsland(exps, namespaceUri, localName, qName, atts );
return;
}
// see if there is anyOtherElementExp
for( int i=0; i<ca.owners.length; i++ )
if( ca.owners[i] instanceof AnyOtherElementExp ) {
// bingo
if(vec==null) vec=new Vector();
vec.add( ca.owners[i] );
}
if( vec!=null ) {
// switch to anyOtherElement state.
AnyOtherElementExp[] exps = new AnyOtherElementExp[vec.size()];
vec.toArray(exps);
switchToAnyOtherElement(exps, namespaceUri, localName, qName, atts );
return;
}
return;
}
// Acceptor must be SimpleAcceptor or ComplexAcceptor.
// we don't know how to handle other acceptors.
throw new Error(); // assertion failed.
}
/**
* switch to another IslandVerifier.
*/
protected void switchToChildIsland( ExternalElementExp[] exps,
String namespaceUri, String localName, String qName, Attributes atts )
throws SAXException {
// we've found ExternalElementExps.
// switch to another IslandVerifier to have it validate them.
// remember tag names (these will be used in endChildIsland method)
lastNamaespaceUri = namespaceUri;
lastLocalName = localName;
lastQName = qName;
// memorize ExternalElementExps to the map
// so that it will be easy to obtain what ExternalElementExps are accepted.
ElementDecl[] rules = new ElementDecl[exps.length];
for( int i=0; i<exps.length; i++ ) {
rules[i] = exps[i].rule;
rule2exp.put( rules[i], exps[i] );
}
if( rule2exp.size()!=rules.length )
// no two ExternalElementExp shall never share the same Rule object.
throw new Error();
// error check is already done in bind phase.
// thus getSchemaByNamespace shall never fail.
IslandSchema is = dispatcher.getSchemaProvider().getSchemaByNamespace(namespaceUri);
// switch to the child Verifier.
IslandVerifier iv = is.createNewVerifier(namespaceUri,rules);
dispatcher.switchVerifier( iv );
// simulate this startElement event
iv.startElement( namespaceUri, localName, qName, atts );
}
/**
* switch to another IslandVerifier to validate anyOtherElement.
*/
protected void switchToAnyOtherElement( AnyOtherElementExp[] exps,
String namespaceUri, String localName, String qName, Attributes atts )
throws SAXException {
// memorize AnyOtherElementExps to the map
for( int i=0; i<exps.length; i++ )
rule2exp.put( exps[i], exps[i] );
IslandVerifier iv = new AnyOtherElementVerifier(exps);
dispatcher.switchVerifier(iv);
// remember tag names (these will be used in endChildIsland method)
lastNamaespaceUri = namespaceUri;
lastLocalName = localName;
lastQName = qName;
// simulate this startElement event
iv.startElement( namespaceUri, localName, qName, atts );
}
private String lastNamaespaceUri;
private String lastLocalName;
private String lastQName;
public void endChildIsland( String childURI, ElementDecl[] ruleSet ) throws SAXException
{
ElementExp[] exps = new ElementExp[ruleSet.length];
for( int i=0; i<ruleSet.length; i++ )
{
exps[i] = (ElementExp)rule2exp.get(ruleSet[i]);
if( exps[i]==null ) throw new Error(); // assertion failed.
// it must be registered.
}
Expression [] epsilons = new Expression[exps.length];
for( int i=0; i<epsilons.length; i++ )
epsilons[i] = Expression.epsilon;
// change current Acceptor to a new Acceptor.
// this new Acceptor is made to accept those satisfied rules only.
current = new ComplexAcceptor(
(REDocumentDeclaration)docDecl,
(ruleSet.length==0)?Expression.nullSet:Expression.epsilon,
epsilons, exps );
// call endElement to let Verifier do the job.
super.endElement( lastNamaespaceUri, lastLocalName, lastQName );
}
public ElementDecl[] endIsland() {
return ((RulesAcceptor)current).getSatisfiedElementDecls();
}
/**
* set of unparsed entity names.
* this set is created on demand.
*/
private Set unparsedEntities;
// IslandVerifier resolves unparsed entity through dispatcher
public boolean isUnparsedEntity( String entityName ) {
// create the set only when it is used.
if( unparsedEntities==null ) {
unparsedEntities = new java.util.HashSet();
int len = dispatcher.countUnparsedEntityDecls();
for( int i=0; i<len; i++ )
unparsedEntities.add( dispatcher.getUnparsedEntityDecl(i).name );
}
return unparsedEntities.contains(entityName);
}
}