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package com.sun.xml.bind.v2.runtime;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;
/**
* Bi-directional map between elements, inner peers,
* and outer peers.
*
*
* TODO: this should be rewritten for efficiency.
*
* @since 2.0
*
* @author
* Kohsuke Kawaguchi ([email protected])
*/
public final class AssociationMap {
final static class Entry {
/** XML element. */
private XmlNode element;
/** inner peer, or null. */
private Object inner;
/** outer peer, or null. */
private Object outer;
public XmlNode element() {
return element;
}
public Object inner() {
return inner;
}
public Object outer() {
return outer;
}
}
private final Map> byElement = new IdentityHashMap>();
private final Map> byPeer = new IdentityHashMap>();
private final Set usedNodes = new HashSet();
/** Records the new {@code element <->inner} peer association. */
public void addInner( XmlNode element, Object inner ) {
Entry e = byElement.get(element);
if(e!=null) {
if(e.inner!=null)
byPeer.remove(e.inner);
e.inner = inner;
} else {
e = new Entry();
e.element = element;
e.inner = inner;
}
byElement.put(element,e);
Entry old = byPeer.put(inner,e);
if(old!=null) {
if(old.outer!=null)
byPeer.remove(old.outer);
if(old.element!=null)
byElement.remove(old.element);
}
}
/** Records the new {@code element <-> outer} peer association. */
public void addOuter( XmlNode element, Object outer ) {
Entry e = byElement.get(element);
if(e!=null) {
if(e.outer!=null)
byPeer.remove(e.outer);
e.outer = outer;
} else {
e = new Entry();
e.element = element;
e.outer = outer;
}
byElement.put(element,e);
Entry old = byPeer.put(outer,e);
if(old!=null) {
old.outer=null;
if(old.inner==null)
// remove this entry
byElement.remove(old.element);
}
}
public void addUsed( XmlNode n ) {
usedNodes.add(n);
}
public Entry byElement( Object e ) {
return byElement.get(e);
}
public Entry byPeer( Object o ) {
return byPeer.get(o);
}
public Object getInnerPeer( XmlNode element ) {
Entry e = byElement(element);
if(e==null) return null;
else return e.inner;
}
public Object getOuterPeer( XmlNode element ) {
Entry e = byElement(element);
if(e==null) return null;
else return e.outer;
}
}