org.acre.analytics.SnapshotFactory.java Source code

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Here is the source code for org.acre.analytics.SnapshotFactory.java

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/**
 *   Copyright 2004-2005 Sun Microsystems, 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 org.acre.analytics;

import org.apache.commons.collections.keyvalue.MultiKey;

import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class SnapshotFactory {
    private static SnapshotFactory ourInstance = new SnapshotFactory();

    public static SnapshotFactory getInstance() {
        return ourInstance;
    }

    private SnapshotFactory() {
    }

    public synchronized Snapshot getSnapshot(String system, String version, Date timestamp) {
        MultiKey key = new MultiKey(system, version, timestamp);
        Snapshot ss = (Snapshot) snapshots.get(key);
        if (ss == null) {
            ss = new Snapshot(system, version, timestamp);
            snapshots.put(key, ss);
        }
        return ss;
    }

    private Map snapshots = Collections.synchronizedMap(new HashMap());
}