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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.netbeans.lib.profiler.heap;

import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

/**
 *
 * @author Tomas Hurka
 */
class TreeObject {
    //~ Static fields/initializers -----------------------------------------------------------------------------------------------
    
    private static final int BUFFER_SIZE = (64 * 1024) / 8;
    
    //~ Instance fields ----------------------------------------------------------------------------------------------------------
    
    private HprofHeap heap;
    private LongBuffer readBuffer;
    private LongBuffer writeBuffer;
    private Set unique;
//private long nextLevelSize;
    
    //~ Constructors -------------------------------------------------------------------------------------------------------------
    
    TreeObject(HprofHeap h, LongBuffer leaves) {
        heap = h;
        writeBuffer = leaves;
    }
    
    //~ Methods ------------------------------------------------------------------------------------------------------------------
    
    
    synchronized void computeTrees() {
        boolean changed;
        try {
            createBuffers();
            do {
                switchBuffers();
                changed = computeOneLevel();
//Systems.debug("Tree obj.   "+heap.idToOffsetMap.treeObj);
//if (changed) Systems.debug("Next level  "+nextLevelSize);
            } while (changed);
        } catch (IOException ex) {
            Systems.printStackTrace(ex);
        }
        deleteBuffers();
//Systems.debug("Done!");
    }
    
    private boolean computeOneLevel() throws IOException {
//nextLevelSize = 0;
        boolean changed = false;
        int idSize = heap.dumpBuffer.getIDSize();
        for (;;) {
            long instanceId = readLong();
            Instance instance;
            List fieldValues;
            Iterator valuesIt;
            long retainedSize = 0;
            
            if (instanceId == 0) {  // end of level
                break;
            }
            instance = heap.getInstanceByID(instanceId);
            if (instance instanceof ObjectArrayInstance) {
                ObjectArrayDump array = (ObjectArrayDump) instance;
                int arrSize = array.getLength();
                long offset = array.getOffset();
                long size = 0;
                LongSet refs = new LongSet();
                
                for  (int i=0; i