/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is Forte for Java, Community Edition. The Initial
 * Developer of the Original Code is Sun Microsystems, Inc. Portions
 * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.api.nodes2looks;

import java.util.*;
import java.io.Serializable;

import org.openide.nodes.Node;
import org.openide.util.Lookup;
import org.netbeans.api.nodes2looks.LookNode;
import org.netbeans.spi.looks.Look;
import org.netbeans.spi.looks.LookSelector;

/** Cache that stores and persists mapping between
 * nodes and their associated look descriptors.
 *
 * @author  Petr Hrebejk
 */
final class Cache extends Object implements Serializable, Node.Handle {
    static final long serialVersionUID = 5338245712342L;

    private Node.Handle handle;
    private Map cache = new HashMap();

    public Cache() {}

    public Cache (Node.Handle del) {
        this.handle = del instanceof Cache ? ((Cache)del).handle : del;
    }
    
    public Node getNode() throws java.io.IOException {
        Node n = handle.getNode ();
        if (n instanceof LookNode) {
            LookNode ln = (LookNode)n;
            this.handle = ln.getCache().handle;
            ln.setCache( this );
        }
        return n;
    }


    public void store (LookNode node) {

        org.netbeans.spi.looks.Look ld = node.getLook();
        Object ro = node.getRepresentedObject();
        String roID = ld.getName( ro, node.getLookup() );


        if ( roID == null ) {
            return;
        }

        String nodePath = getLookNodePath( node.getParentNode() );

        List items = (List)cache.get( nodePath );
        if ( items == null ) {
            items = new ArrayList();
            cache.put( nodePath, items );
        }

        String item[] = { ld.getName(), ro.getClass().getName(), roID};
        items.add( item );


    }

    public Look find (LookNode parentNode, Object representedObject ) {

        String path = getLookNodePath( parentNode );

        List items = (List)cache.get( path );

        if ( items == null ) {
            return null;
        }

        // findItem( );

        HashMap ldName2ld = new HashMap();

        for( Iterator it = items.iterator(); it.hasNext(); ) {
            String[] item = (String[])it.next();

            if (!item[1].equals (representedObject.getClass().getName())) {
                continue;
            }

            Look look = LookSelector_getLook ( parentNode.getLookSelectorForChildren(), item[0], representedObject );
            if (look == null) {
                continue;
            }

            if (look != null && item[2].equals (look.getName ( representedObject, Lookup.EMPTY ))) { // PENDING
                return look;
            }
        }

        return null;
    }


    // methods to track the state of the tree ----------------------------------

    // PENDING to be removed
    private static Look LookSelector_getLook ( LookSelector ls, String name, Object representedObject ) {

        Enumeration e = ls.getLooks( representedObject );

        while( e.hasMoreElements() ) {
            Look l = (Look)e.nextElement();
            if ( l.getName().equals( name ) ) {
                return l;
            }
        }

        return null;
    }


    private static String getLookNodePath( Node node ) {
        StringBuffer buf = new StringBuffer (512);

        for (;;) {
            if (!(node instanceof LookNode) ) {
                break;
            }

            buf.insert (0, node.getName() );
            node = node.getParentNode();
        }

        return buf.toString();
    }

}