/*
* @(#)$Id: AttributeToken.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.verifier.regexp;
import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.IDContextProvider2;
import com.sun.msv.util.DatatypeRef;
/**
* represents attribute and its value.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public class AttributeToken extends Token
{
public String namespaceURI;
public String localName;
public String qName;
public StringToken value;
protected REDocumentDeclaration docDecl;
/**
* holds a reference to the assigned type.
*
* If this AttributeToken is successfully consumed, then this field
* contains the AttributeExp which consumed this token.
*
* If this token is not consumed or several different AttributeExps
* consumed this token, then null.
*/
public AttributeExp matchedExp = null;
/**
* If this value is false, the "matched" field must always null. This indicates
* that no AttributeExp has consumed this token yet.
* If this value is true and the "matched" field is non-null, then it means
* that AttributeExp has consumed this token.
* If this value is true and the "matched" field is null, then more than
* one AttributeExps have consumed this token.
*/
private boolean saturated = false;
AttributeToken( REDocumentDeclaration docDecl ) {
this.docDecl = docDecl;
}
protected AttributeToken( REDocumentDeclaration docDecl,
String namespaceURI, String localName, String qName, String value, IDContextProvider2 context ) {
this( docDecl, namespaceURI, localName, qName,
new StringToken(docDecl,value,context,new DatatypeRef()) );
}
protected AttributeToken( REDocumentDeclaration docDecl,
String namespaceURI, String localName, String qName, StringToken value ) {
this(docDecl);
reinit( namespaceURI, localName, qName, value );
}
void reinit( String namespaceURI, String localName, String qName, StringToken value ) {
this.namespaceURI = namespaceURI;
this.localName = localName;
this.qName = qName;
this.value = value;
matchedExp = null;
saturated = false;
}
/**
* creates a special AttributeToken which matchs any content restrictions.
*
* This token acts like a wild card for the attribute. This method is
* used for error recovery.
*/
final AttributeRecoveryToken createRecoveryAttToken() {
return new AttributeRecoveryToken( docDecl, namespaceURI, localName, qName, value );
}
public boolean match( AttributeExp exp ) {
// Attribute name must meet the constraint of NameClass
if(!exp.nameClass.accepts(namespaceURI,localName)) return false;
// content model of the attribute must consume the value
boolean satisfied = false;
if(value.literal.trim().length()==0 && exp.exp.isEpsilonReducible())
satisfied = true;
else
if(docDecl.resCalc.calcResidual(exp.exp, value).isEpsilonReducible())
satisfied = true;
if(satisfied) {
// store the expression who consumed this token.
if( !saturated || exp==matchedExp ) matchedExp=exp;
else matchedExp=null;
/* the above is the shortened form of:
if( !saturated )
matchedExp = exp;
else
if( exp!=matchedExp )
matchedExp = null;
*/
saturated = true;
return true;
}
return false;
}
}