org.apache.hadoop.raid.protocol.PolicyList.java Source code

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Here is the source code for org.apache.hadoop.raid.protocol.PolicyList.java

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/**
 * 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.raid.protocol;

import java.io.IOException;
import java.io.DataInput;
import java.io.DataOutput;
import java.util.Collection;
import java.util.List;
import java.util.LinkedList;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableFactories;
import org.apache.hadoop.io.WritableFactory;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.conf.Configuration;

/**
 * Maintains informatiom about all policies that belong to a category.
 * These policies have to be applied one-at-a-time and cannot be run
 * simultaneously.
 */
public class PolicyList implements Writable {
    public static final Log LOG = LogFactory.getLog("org.apache.hadoop.raid.protocol.PolicyList");

    private List<PolicyInfo> category; // list of policies
    private Path srcPath;

    /**
     * Create a new category of policies.
     */
    public PolicyList() {
        this.category = new LinkedList<PolicyInfo>();
        this.srcPath = null;
    }

    /**
     * Add a new policy to this category.
     */
    public void add(PolicyInfo info) {
        category.add(info);
    }

    public void setSrcPath(Configuration conf, String src) throws IOException {
        srcPath = new Path(src);
        srcPath = srcPath.makeQualified(srcPath.getFileSystem(conf));
    }

    public Path getSrcPath() {
        return srcPath;
    }

    /**
     * Returns the policies in this category
     */
    public Collection<PolicyInfo> getAll() {
        return category;
    }

    //////////////////////////////////////////////////
    // Writable
    //////////////////////////////////////////////////
    static { // register a ctor
        WritableFactories.setFactory(PolicyList.class, new WritableFactory() {
            public Writable newInstance() {
                return new PolicyList();
            }
        });
    }

    public void write(DataOutput out) throws IOException {
        out.writeInt(category.size());
        for (PolicyInfo p : category) {
            p.write(out);
        }
    }

    public void readFields(DataInput in) throws IOException {
        int count = in.readInt();
        for (int i = 0; i < count; i++) {
            PolicyInfo p = new PolicyInfo();
            p.readFields(in);
            add(p);
        }
    }
}