org.apache.hama.HamaConfiguration.java Source code

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Here is the source code for org.apache.hama.HamaConfiguration.java

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/**
 * Copyright 2007 The Apache Software Foundation
 *
 * 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.hama;

import java.util.Map.Entry;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;

/**
 * Adds Hama configuration files to a Configuration.
 */
public class HamaConfiguration extends Configuration {
    /** constructor */
    public HamaConfiguration() {
        super();
        addHamaResources(this);
    }

    public HamaConfiguration(Path confFile) {
        super();
        this.addResource(confFile);
    }

    /**
     * Create a clone of passed configuration.
     * 
     * @param c Configuration to clone.
     */
    public HamaConfiguration(final Configuration c) {
        this();
        for (Entry<String, String> e : c) {
            set(e.getKey(), e.getValue());
        }
    }

    /**
     * @return a Configuration with Hama resources
     */
    public static Configuration create() {
        Configuration conf = new Configuration();
        return addHamaResources(conf);
    }

    /**
     * @param that Configuration to clone.
     * @return a Configuration created with the hama-*.xml files plus the given
     *         configuration.
     */
    public static Configuration create(final Configuration that) {
        Configuration conf = create();
        merge(conf, that);
        return conf;
    }

    /**
     * Merge two configurations.
     * 
     * @param destConf the configuration that will be overwritten with items from
     *          the srcConf
     * @param srcConf the source configuration
     **/
    public static void merge(Configuration destConf, Configuration srcConf) {
        for (Entry<String, String> e : srcConf) {
            destConf.set(e.getKey(), e.getValue());
        }
    }

    /**
     * Adds Hama configuration files to a Configuration
     */
    private static Configuration addHamaResources(Configuration conf) {
        conf.addResource("hama-default.xml");
        conf.addResource("hama-site.xml");
        return conf;

    }
}