/**
* 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.hadoop.conf;
import java.io.BufferedInputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.WeakHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.hadoop.util.StringUtils;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;
/**
* Provides access to configuration parameters.
*
* <h4 id="Resources">Resources</h4>
*
* <p>
* Configurations are specified by resources. A resource contains a set of name/value pairs as XML data. Each resource is named by either a <code>String</code> or by a {@link Path}. If named by a <code>String</code>,
* then the classpath is examined for a file with that name. If named by a <code>Path</code>, then the local filesystem is examined directly, without referring to the classpath.
*
* <p>
* Unless explicitly turned off, Hadoop by default specifies two resources, loaded in-order from the classpath:
* <ol>
* <li><tt><a href="{@docRoot}/../core-default.html">core-default.xml</a>
* </tt>: Read-only defaults for hadoop.</li>
* <li><tt>core-site.xml</tt>: Site-specific configuration for a given hadoop installation.</li>
* </ol>
* Applications may add additional resources, which are loaded subsequent to these resources in the order they are added.
*
* <h4 id="FinalParams">Final Parameters</h4>
*
* <p>
* Configuration parameters may be declared <i>final</i>. Once a resource declares a value final, no subsequently-loaded resource can alter that value. For example, one might define a final parameter with: <tt><pre>
* <property>
* <name>dfs.client.buffer.dir</name>
* <value>/tmp/hadoop/dfs/client</value>
* <b><final>true</final></b>
* </property></pre></tt>
*
* Administrators typically define parameters as final in <tt>core-site.xml</tt> for values that user applications may not alter.
*
* <h4 id="VariableExpansion">Variable Expansion</h4>
*
* <p>
* Value strings are first processed for <i>variable expansion</i>. The available properties are:
* <ol>
* <li>Other properties defined in this Configuration; and, if a name is undefined here,</li>
* <li>Properties in {@link System#getProperties()}.</li>
* </ol>
*
* <p>
* For example, if a configuration resource contains the following property definitions: <tt><pre>
* <property>
* <name>basedir</name>
* <value>/user/${<i>user.name</i>}</value>
* </property>
*
* <property>
* <name>tempdir</name>
* <value>${<i>basedir</i>}/tmp</value>
* </property></pre></tt>
*
* When <tt>conf.get("tempdir")</tt> is called, then <tt>${<i>basedir</i>}</tt> will be resolved to another property in this Configuration, while <tt>${<i>user.name</i>}</tt> would then ordinarily be resolved to the
* value of the System property with that name.
*/
public class Configuration implements Iterable<Map.Entry<String, String>>, Writable {
private static final Log LOG = LogFactory.getLog(Configuration.class);
private boolean quietmode = true;
/**
* List of configuration resources.
*/
private ArrayList<Object> resources = new ArrayList<Object>();
/**
* List of configuration parameters marked <b>final</b>.
*/
private Set<String> finalParameters = new HashSet<String>();
private boolean loadDefaults = true;
/**
* Configuration objects
*/
private static final WeakHashMap<Configuration, Object> REGISTRY = new WeakHashMap<Configuration, Object>();
/**
* List of default Resources. Resources are loaded in the order of the list entries
*/
private static final CopyOnWriteArrayList<String> defaultResources = new CopyOnWriteArrayList<String>();
/**
* Flag to indicate if the storage of resource which updates a key needs to be stored for each key
*/
private boolean storeResource;
/**
* Stores the mapping of key to the resource which modifies or loads the key most recently
*/
private HashMap<String, String> updatingResource;
static {
// print deprecation warning if hadoop-site.xml is found in classpath
ClassLoader cL = Thread.currentThread().getContextClassLoader();
if (cL == null) {
cL = Configuration.class.getClassLoader();
}
if (cL.getResource("hadoop-site.xml") != null) {
LOG.warn("DEPRECATED: hadoop-site.xml found in the classpath. " + "Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, "
+ "mapred-site.xml and hdfs-site.xml to override properties of " + "core-default.xml, mapred-default.xml and hdfs-default.xml " + "respectively");
}
addDefaultResource("core-default.xml");
addDefaultResource("core-site.xml");
}
private Properties properties;
private Properties overlay;
private ClassLoader classLoader;
{
classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = Configuration.class.getClassLoader();
}
}
/** A new configuration. */
public Configuration() {
this(true);
}
/**
* A new configuration where the behavior of reading from the default resources can be turned off.
*
* If the parameter {@code loadDefaults} is false, the new instance will not load resources from the default files.
* @param loadDefaults specifies whether to load from the default files
*/
public Configuration(boolean loadDefaults) {
this.loadDefaults = loadDefaults;
// if (LOG.isDebugE
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