Java Jar Manifest getManifestEntryValue(IResource manifest, String entryKey)

Description

get Manifest Entry Value

License

Apache License

Declaration

private static String getManifestEntryValue(IResource manifest,
            String entryKey) 

Method Source Code

//package com.java2s;
/*//from  ww w.j a  v a2 s .  c o  m
 * Copyright (C) 2003-2014  Pascal Essiembre
 *
 * Licensed 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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.StringTokenizer;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.resources.IResource;

public class Main {
    private static String getManifestEntryValue(IResource manifest,
            String entryKey) {
        if (manifest instanceof IFile) {
            String content = getFileContent((IFile) manifest, "UTF8");
            int index = content.indexOf(entryKey);
            if (index != -1) {
                StringTokenizer st = new StringTokenizer(
                        content.substring(index + entryKey.length()),
                        ";:\r\n");
                return st.nextToken().trim();
            }
        }
        return null;
    }

    /**
     * Returns the file content as UTF8 string.
     * 
     * @param file
     * @param charset 
     * @return
     */
    public static String getFileContent(IFile file, String charset) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        InputStream in = null;
        try {
            in = file.getContents(true);
            byte[] buf = new byte[8000];
            for (int count; (count = in.read(buf)) != -1;)
                outputStream.write(buf, 0, count);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException ignore) {
                }
            }
        }
        try {
            return outputStream.toString(charset);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return outputStream.toString();
        }
    }
}

Related

1. getManifest(ZipFile zipFile)
2. getManifestAttribute(InputStream in, String attr)
3. getManifestAttribute(Manifest m)
4. getManifestAttribute(String jarUrl, String attribute)
5. getManifestAttributes(File jarFile)
6. getManifestFileLocation(String moduleDir)
7. getManifestHeaders(File aJarFile)
8. getManifestHeaders(Manifest manifest)
9. getManifestHeaderValues(final Manifest manifest, final String headerName)