LensHelper.java

/*
 * RHQ Management Platform
 * Copyright (C) 2005-2009 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation, and/or the GNU Lesser
 * General Public License, version 2.1, also as published by the Free
 * Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License and the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * and the GNU Lesser General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.rhq.plugins.apache.helper;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class LensHelper {
    public static final String TEMP_DIRECTORY = "java.io.tmpdir";
    public static final String TEMP_FILE_SUFFIX = ".aug";

    public static String getLensPath(String param) throws IOException, Exception {
        String lensPath = null;

        if (param.indexOf(File.separatorChar) == -1) {

        } else
            lensPath = param;
        return lensPath;

    }

    public static void copyFile(InputStream in, File destination) throws Exception {

        if (!destination.canWrite())
            throw new Exception("Creating of temporary file for lens failed. Destination file "
                + destination.getAbsolutePath() + " is not accessible.");

        OutputStream out = new FileOutputStream(destination);

        byte[] buf = new byte[1024];
        int length;

        while ((length = in.read(buf)) > 0) {
            out.write(buf, 0, length);
        }

        in.close();
        out.close();

    }

    public static File createTempDir(String name) throws IOException {

        String tempDir = (String) System.getProperties().get(TEMP_DIRECTORY);

        File tempDirectory = new File(tempDir);
        File[] lens = tempDirectory.listFiles(new LensFilter(name));

        File lensDirectory;

        if (lens.length == 0) {
            File tempFile = File.createTempFile(name, "");
            String nm = tempFile.getName();
            tempFile.delete();
            lensDirectory = new File(tempDirectory, nm);
            lensDirectory.mkdir();
            lensDirectory.deleteOnExit();
        } else {
            lensDirectory = lens[0];
        }

        return lensDirectory;

    }

    public static String getTempDirectoryPath() {
        return (String) System.getProperties().get(TEMP_DIRECTORY);
    }

    public static File cpFileFromPluginToTemp(ClassLoader loader, File tempDirectory, String fileName)
        throws IOException, Exception {

        File destinationFile = new File(tempDirectory, fileName);
        if (!destinationFile.exists()) {
            destinationFile.createNewFile();

            InputStream input = loader.getResourceAsStream(fileName);
            copyFile(input, destinationFile);
        }

        return destinationFile;
    }

}