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Abstraction of different facilities and default configurations for script bindings
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/*
 * RHQ Management Platform
 * Copyright (C) 2005-2008 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 as published by
 * the Free Software Foundation version 2 of the License.
 *
 * 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.rhq.bindings.util;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.net.URL;

/**
 * @author Greg Hinkle
 * @author Lukas Krejci
 */
public class PackageFinder {

    private List jarLocations;

    public PackageFinder(List jarLocations) {
        this.jarLocations = new ArrayList(jarLocations);
    }

    public Set findPackages(String packageRoot) throws IOException {
        HashSet found = new HashSet();        
        
        List jars = new ArrayList();

        for (File loc : jarLocations) {
            if (loc.exists()) {
                jars.addAll(Arrays.asList(loc.listFiles(new FileFilter() {
                    public boolean accept(File pathname) {
                        return pathname.isFile() && pathname.getName().endsWith(".jar");
                    }
                })));
            }
        }

        jars.addAll(loadResourcesFromClassPath(packageRoot, "jar:file:"));

        for (File jar : jars) {
            findPackagesInJar(packageRoot, found, jar);
        }

        List dirs = loadResourcesFromClassPath(packageRoot, "file:");
        for(File d : dirs) {
            findPackagesInDirectory(packageRoot, found, d);
        }
        
        return found;
    }

    private List loadResourcesFromClassPath(String pkgRoot, String prefix) throws IOException {
        List jarFiles = new ArrayList();
        String pkgPath = pkgRoot.replaceAll("\\.", "/");
        Enumeration resources = getClass().getClassLoader().getResources(pkgPath);
        URL resource = null;

        while (resources.hasMoreElements()) {
            resource = resources.nextElement();
            if (resource.toString().startsWith(prefix)) {
                String jarFilePath = getFilePath(resource, prefix);
                jarFiles.add(new File(jarFilePath));
            }
        }

        return jarFiles;
    }

    private String getFilePath(URL resource, String prefix) {
        int startIndex = prefix.length();
        String string = resource.toString().substring(startIndex);
        int endIndex = string.indexOf("!");
        if (endIndex < 0) {
            endIndex = string.length();
        }
        return string.substring(0, endIndex);
    }

    private void findPackagesInJar(String packageRoot, Set list, File jar) throws IOException {

        Set paths = new HashSet();
        JarFile jf = null;
        try {
            jf = new JarFile(jar);

            String packagePath = packageRoot.replaceAll("\\.", "/");

            Enumeration entries = jf.entries();

            while (entries.hasMoreElements()) {
                JarEntry entry = entries.nextElement();

                if (entry.getName().startsWith(packagePath)) {
                    String match = entry.getName().substring(0, entry.getName().lastIndexOf("/"));
                    paths.add(match.replaceAll("/", "\\."));
                }
            }
            list.addAll(paths);
        } finally {
            try {
                if (jf != null) {
                    jf.close();
                }
            } catch (IOException e) {
                
            }
        }
    }
    
    private void findPackagesInDirectory(String packageRoot, Set list, File dir) throws IOException {
        File[] subDirs = dir.listFiles();
        
        for(File s : subDirs) {
            if (s.isDirectory()) {
                String packageName = packageRoot + "." + s.getName();
                list.add(packageName);
                findPackagesInDirectory(packageName, list, s);
            }
        }
    }
}