net.sourceforge.docfetcher.model.index.file.MapValueDiff.java Source code

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Here is the source code for net.sourceforge.docfetcher.model.index.file.MapValueDiff.java

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/*******************************************************************************
 * Copyright (c) 2010, 2011 Tran Nam Quang.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Tran Nam Quang - initial API and implementation
 *******************************************************************************/

package net.sourceforge.docfetcher.model.index.file;

import java.util.Map;

import net.sourceforge.docfetcher.util.Stoppable;

import com.google.common.collect.Maps;

/**
 * @author Tran Nam Quang
 */
class MapValueDiff<K, V, T extends Throwable> extends Stoppable<T> {

    private final Map<K, V> left;
    private final Map<K, V> right;

    public MapValueDiff(Map<K, V> left, Map<K, V> right) {
        this.left = left;
        this.right = right;
    }

    protected final void doRun() {
        Map<K, V> rightCopy = Maps.newHashMap(right);
        for (Map.Entry<K, V> leftEntry : left.entrySet()) {
            if (isStopped())
                return;
            K leftKey = leftEntry.getKey();
            V leftValue = leftEntry.getValue();
            V rightValue = rightCopy.remove(leftKey);
            if (rightValue != null)
                handleBoth(leftValue, rightValue);
            else
                handleOnlyLeft(leftValue);
        }
        for (V rightValue : rightCopy.values()) {
            if (isStopped())
                return;
            handleOnlyRight(rightValue);
        }
    }

    protected void handleOnlyLeft(V leftValue) {
    }

    protected void handleOnlyRight(V rightValue) {
    }

    protected void handleBoth(V leftValue, V rightValue) {
    }

}