Java DataInputStream Read loadChecksum(Bundle b, BundleContext bc)

Description

Returns the stored checksum of the bundle.

License

Apache License

Parameter

Parameter	Description
b	the bundle whose checksum must be returned
bc	the FileInstall's bundle context.

Return

the stored checksum of the bundle

Declaration

public static long loadChecksum(Bundle b, BundleContext bc) 

Method Source Code

//package com.java2s;
/*/*from w  w  w  .  j a  va2  s . com*/
 * 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.
 */

import java.io.DataInputStream;

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;

public class Main {
    private static final String CHECKSUM_SUFFIX = ".checksum";

    /**
     * Returns the stored checksum of the bundle.
     * 
     * @param b
     *            the bundle whose checksum must be returned
     * @param bc
     *            the FileInstall's bundle context.
     * @return the stored checksum of the bundle
     */
    public static long loadChecksum(Bundle b, BundleContext bc) {
        String key = getBundleKey(b);
        File f = bc.getDataFile(key + CHECKSUM_SUFFIX);
        DataInputStream in = null;
        try {
            in = new DataInputStream(new FileInputStream(f));
            return in.readLong();
        } catch (Exception e) {
            return Long.MIN_VALUE;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // Ignore
                }
            }
        }
    }

    private static String getBundleKey(Bundle b) {
        return Long.toString(b.getBundleId());
    }
}

Related

1. loadColorTable(final File file)
2. loadIntArrayFromFile(File file)
3. readBytes(DataInputStream dataStream, int numberOfBytes)
4. readBytes(DataInputStream input, int size)