com.sun.msv.grammar.ValueExp Maven / Gradle / Ivy
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package com.sun.msv.grammar;
import org.relaxng.datatype.Datatype;
import com.sun.msv.util.StringPair;
/**
* Expression that matchs a particular value of a {@link Datatype}.
*
* @author Kohsuke KAWAGUCHI
*/
public final class ValueExp extends Expression implements DataOrValueExp {
/** Datatype object that is used to test the equality. */
public final Datatype dt;
public Datatype getType() { return dt; }
/** This expression matches this value only. */
public final Object value;
/**
* 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; }
protected ValueExp( Datatype dt, StringPair typeName, Object value ) {
super(dt.hashCode()+dt.valueHashCode(value));
this.dt=dt;
this.name = typeName;
this.value = value;
}
protected final int calcHashCode() {
return dt.hashCode()+dt.valueHashCode(value);
}
public boolean equals( Object o ) {
if (o == null) return false;
// 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;
ValueExp rhs = (ValueExp)o;
if(!rhs.dt.equals(dt)) return false;
return dt.sameValue(value,rhs.value);
}
public Object visit( ExpressionVisitor visitor ) { return visitor.onValue(this); }
public Expression visit( ExpressionVisitorExpression visitor ) { return visitor.onValue(this); }
public boolean visit( ExpressionVisitorBoolean visitor ) { return visitor.onValue(this); }
public void visit( ExpressionVisitorVoid visitor ) { visitor.onValue(this); }
protected boolean calcEpsilonReducibility() {
return false;
}
// serialization support
private static final long serialVersionUID = 1;
}