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netflix-zeno developed by Netflix

There is a newer version: 2.22.3

/*
 *
 *  Copyright 2013 Netflix, Inc.
 *
 *     Licensed 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 com.netflix.zeno.diff.history;

import com.netflix.zeno.diff.TypeDiffInstruction;
import com.netflix.zeno.fastblob.FastBlobStateEngine;
import com.netflix.zeno.fastblob.state.FastBlobTypeDeserializationState;
import com.netflix.zeno.util.collections.impl.OpenAddressingHashMap;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * A complete historical representation of the objects available in a FastBlobStateEngine at some point in time.
 *
 * This representation contains all of the objects of each type specified in a set of TypeDiffInstructions, keyed
 * by the keys specified in thos TypeDiffInstructions.
 *
 * @author dkoszewnik
 *
 */
public class DiffHistoryDataState {

    private final String version;
    private final Map> typeStates;

    /**
     * Create a new DiffHistoryDataState.  Pulls data from the supplied FastBlobStateEngine in the manner
     * specified by the supplied set of TypeDiffInstructions.
     *
     * @param stateEngine
     * @param typeInstructions
     */
    @SuppressWarnings("unchecked")
    public DiffHistoryDataState(FastBlobStateEngine stateEngine, TypeDiffInstruction typeInstructions[]) {
        this.version = stateEngine.getLatestVersion();
        this.typeStates = new HashMap>();

        for(TypeDiffInstruction instruction : typeInstructions) {
            FastBlobTypeDeserializationState