com.alibaba.wasp.conf.WaspConfiguration.java Source code

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Here is the source code for com.alibaba.wasp.conf.WaspConfiguration.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 com.alibaba.wasp.conf;

import com.alibaba.wasp.util.VersionInfo;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;

import java.util.Map.Entry;

/**
 * Adds Wasp configuration files to a Configuration
 */
public class WaspConfiguration extends Configuration {

    private static void checkDefaultsVersion(Configuration conf) {
        if (conf.getBoolean("wasp.defaults.for.version.skip", Boolean.TRUE))
            return;
        String defaultsVersion = conf.get("wasp.defaults.for.version");
        String thisVersion = VersionInfo.getVersion();
        if (!thisVersion.equals(defaultsVersion)) {
            throw new RuntimeException("wasp-default.xml file seems to be for and old version of Wasp ("
                    + defaultsVersion + "), this version is " + thisVersion);
        }
    }

    public static Configuration addWaspResources(Configuration conf) {
        conf.addResource("wasp-default.xml");
        conf.addResource("wasp-site.xml");

        checkDefaultsVersion(conf);
        return conf;
    }

    /**
     * Creates a Configuration with HBase and Wasp resources
     * 
     * @return a Configuration with HBase and Wasp resources
     */
    public static Configuration create() {
        Configuration conf = HBaseConfiguration.create();
        return addWaspResources(conf);
    }

    /**
     * Creates a clone of passed configuration.
     * @param that Configuration to clone.
     * @return a clone of passed 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());
        }
    }

    /**
     * 
     * @return whether to show Wasp Configuration in servlet
     */
    public static boolean isShowConfInServlet() {
        boolean isShowConf = false;
        try {
            if (Class.forName("org.apache.hadoop.conf.ConfServlet") != null) {
                isShowConf = true;
            }
        } catch (Exception e) {

        }
        return isShowConf;
    }
}