subprojects/s4-comm/src/main/java/org/apache/s4/comm/topology/ZNRecord.java

/**
 * 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.apache.s4.comm.topology;

import java.util.List;
import java.util.Map;
import java.util.TreeMap;

/**
 * ZooKeeper's custom znode data structure. Allows for easily information addition and retrieval.
 * 
 */
public class ZNRecord {

    String id;

    public String getId() {
        return id;
    }

    Map<String, String> simpleFields;
    Map<String, List<String>> listFields;
    Map<String, Map<String, String>> mapFields;

    private ZNRecord() {

    }

    public ZNRecord(String id) {
        this.id = id;
        simpleFields = new TreeMap<String, String>();
        mapFields = new TreeMap<String, Map<String, String>>();
        listFields = new TreeMap<String, List<String>>();
    }

    public ZNRecord(ZNRecord that) {
        this(that.id);
        simpleFields.putAll(that.simpleFields);
        mapFields.putAll(that.mapFields);
        listFields.putAll(that.listFields);
    }

    public String putSimpleField(String key, String value) {
        return simpleFields.put(key, value);
    }

    public String getSimpleField(String key) {
        return simpleFields.get(key);
    }

    public List<String> putListField(String key, List<String> value) {
        return listFields.put(key, value);
    }

    public List<String> getListField(String key) {
        return listFields.get(key);
    }

    public Map<String, String> putMapField(String key, Map<String, String> value) {
        return mapFields.put(key, value);
    }

    public Map<String, String> getMapField(String key) {
        return mapFields.get(key);
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id == null) ? 0 : id.hashCode());
        result = prime * result + ((listFields == null) ? 0 : listFields.hashCode());
        result = prime * result + ((mapFields == null) ? 0 : mapFields.hashCode());
        result = prime * result + ((simpleFields == null) ? 0 : simpleFields.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (obj instanceof ZNRecord) {
            ZNRecord that = (ZNRecord) obj;
            return this.id.equals(that.id) && this.simpleFields.equals(that.simpleFields)
                    && this.mapFields.equals(that.mapFields) && this.listFields.equals(that.listFields);
        }
        return false;
    }
}