/*
* @(#)$Id: GroupState.java 1566 2003-06-09 20:37:49Z kk122374 $
*
* 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.reader.xmlschema;
import org.xml.sax.Locator;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ReferenceContainer;
import com.sun.msv.grammar.xmlschema.GroupDeclExp;
import com.sun.msv.grammar.xmlschema.XMLSchemaSchema;
import com.sun.msv.reader.State;
import com.sun.msv.util.StartTagInfo;
/**
* used to parse <group> element.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public class GroupState extends RedefinableDeclState {
protected State createChildState( StartTagInfo tag ) {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
// TODO: group reference is prohibited under group element.
return reader.createModelGroupState(this,tag);
}
protected ReferenceContainer getContainer() {
return ((XMLSchemaReader)reader).currentSchema.groupDecls;
}
protected Expression initialExpression() {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
if( startTag.containsAttribute("ref") ) {
// this this tag has @ref.
Expression exp = reader.resolveQNameRef(
startTag, "ref",
new XMLSchemaReader.RefResolver() {
public ReferenceContainer get( XMLSchemaSchema g ) {
return g.groupDecls;
}
} );
if( exp==null ) return Expression.epsilon; // couldn't resolve QName.
return exp;
}
return null; // use null to indicate that there is no child expression.
}
protected Expression castExpression( Expression halfCastedExpression, Expression newChildExpression ) {
if( halfCastedExpression!=null ) {
reader.reportError( XMLSchemaReader.ERR_MORE_THAN_ONE_CHILD_EXPRESSION );
return halfCastedExpression;
}
return newChildExpression; // the first one.
}
protected Expression annealExpression(Expression contentType) {
final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
if( !isGlobal() ) return contentType;
// this <group> element is global.
// register this as a global group definition.
String name = startTag.getAttribute("name");
if( name==null ) {
reader.reportError( XMLSchemaReader.ERR_MISSING_ATTRIBUTE, "group", "name" );
// recover by returning a meaningless value, thereby ignoring this declaration.
return Expression.nullSet;
}
if( contentType==null ) {
reader.reportError( XMLSchemaReader.ERR_MISSING_CHILD_EXPRESSION );
return Expression.nullSet;
}
GroupDeclExp decl;
if( isRedefine() )
decl = (GroupDeclExp)super.oldDecl;
else {
decl = reader.currentSchema.groupDecls.getOrCreate(name);
if( decl.exp!=null )
reader.reportError(
new Locator[]{this.location,reader.getDeclaredLocationOf(decl)},
XMLSchemaReader.ERR_DUPLICATE_GROUP_DEFINITION,
new Object[]{name} );
}
reader.setDeclaredLocationOf(decl);
decl.exp = contentType;
return decl;
}
}