com.sun.msv.grammar.util.PossibleNamesCollector Maven / Gradle / Ivy
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package com.sun.msv.grammar.util;
import java.util.Set;
import com.sun.msv.grammar.AnyNameClass;
import com.sun.msv.grammar.ChoiceNameClass;
import com.sun.msv.grammar.DifferenceNameClass;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.NameClassVisitor;
import com.sun.msv.grammar.NamespaceNameClass;
import com.sun.msv.grammar.NotNameClass;
import com.sun.msv.grammar.SimpleNameClass;
import com.sun.msv.util.StringPair;
/**
* computes the possible names.
*
*
* See
* the description.
*
* @author Kohsuke KAWAGUCHI
*/
public class PossibleNamesCollector implements NameClassVisitor {
/**
* computes all possibile names for this name class, and returns
* the set of {@link StringPair}.
*/
public static Set calc( NameClass nc ) {
PossibleNamesCollector col = new PossibleNamesCollector();
nc.visit(col);
return col.names;
}
public static final String MAGIC = "\u0000";
private static final StringPair pairForAny = new StringPair( MAGIC, MAGIC );
/** this set will receive all possible names. */
private Set names = new java.util.HashSet();
public Object onChoice( ChoiceNameClass nc ) {
nc.nc1.visit(this);
nc.nc2.visit(this);
return null;
}
public Object onAnyName( AnyNameClass nc ) {
names.add( pairForAny );
return null;
}
public Object onSimple( SimpleNameClass nc ) {
names.add( new StringPair( nc.namespaceURI, nc.localName ) );
return null;
}
public Object onNsName( NamespaceNameClass nc ) {
names.add( new StringPair( nc.namespaceURI, MAGIC ) );
return null;
}
public Object onNot( NotNameClass nc ) {
names.add( pairForAny );
nc.child.visit(this);
return null;
}
public Object onDifference( DifferenceNameClass nc ) {
nc.nc1.visit(this);
nc.nc2.visit(this);
return null;
}
};