/*
* @(#)$Id: DataExp.java,v 1.1 2001/10/18 23:52:08 Bear Exp $
*
* 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.grammar;
import org.relaxng.datatype.Datatype;
import org.relaxng.datatype.ValidationContext;
import com.sun.msv.util.StringPair;
/**
* Expression that matchs characters of the particular {@link Datatype}.
*
* @author <a href="mailto:kohsuke.kawaguchi@eng.sun.com">Kohsuke KAWAGUCHI</a>
*/
public final class DataExp extends Expression implements DataOrValueExp {
/** datatype object that actually validates text. */
public final Datatype dt;
public Datatype getType() { return dt; }
/**
* name of this datatype.
*
* The value of this field is not considered as significant.
* When two TypedStringExps share the same Datatype object,
* then they are unified even if they have different names.
*/
public final StringPair name;
public StringPair getName() { return name; }
/**
* 'except' clause of RELAX NG.
* If a token matches this pattern, then it should be rejected.
*/
public final Expression except;
protected DataExp( Datatype dt, StringPair typeName, Expression except ) {
super(hashCode(dt,except,HASHCODE_DATA));
this.dt=dt;
this.name = typeName;
this.except = except;
}
public boolean equals( Object o ) {
// Note that equals method of this class *can* be sloppy,
// since this class does not have a pattern as its child.
// Therefore datatype vocaburary does not necessarily provide
// strict equals method.
if(o.getClass()!=this.getClass()) return false;
DataExp rhs = (DataExp)o;
if( this.except != rhs.except ) return false;
return rhs.dt.equals(dt);
}
public Object visit( ExpressionVisitor visitor ) { return visitor.onData(this); }
public Expression visit( ExpressionVisitorExpression visitor ) { return visitor.onData(this); }
public boolean visit( ExpressionVisitorBoolean visitor ) { return visitor.onData(this); }
public void visit( ExpressionVisitorVoid visitor ) { visitor.onData(this); }
protected boolean calcEpsilonReducibility() {
return false;
}
}