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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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package org.glassfish.embed.impl;

import com.sun.enterprise.module.ModuleDefinition;
import com.sun.enterprise.module.ModuleDependency;
import com.sun.enterprise.module.ModuleMetadata;
import com.sun.hk2.component.InhabitantsFile;

import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.jar.Manifest;
import java.util.Enumeration;
import java.util.Collection;
import java.util.Collections;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.DataInputStream;

/**
 * {@link ModuleDefinition} that doesn't actually load any new jars,
 * but simply use existing {@link ClassLoader} to obtain all the information.
 *
 * @author Kohsuke Kawaguchi
 */
public class ProxyModuleDefinition implements ModuleDefinition {
    private final ModuleMetadata metadata = new ModuleMetadata();
    private final Manifest manifest = new Manifest();

    public ProxyModuleDefinition(ClassLoader classLoader) throws IOException {
        this(classLoader, Collections.singleton("default"));
    }

    public ProxyModuleDefinition(ClassLoader classLoader, Collection habitatNames) throws IOException {
        for (String habitatName : habitatNames) {
            Enumeration inhabitants = classLoader.getResources(InhabitantsFile.PATH+'/'+habitatName);
            while (inhabitants.hasMoreElements()) {
                URL url = inhabitants.nextElement();
                metadata.addHabitat(habitatName,
                    new ModuleMetadata.InhabitantsDescriptor(url, readFully(url))
                );
            }
        }
    }

    private static byte[] readFully(URL url) throws IOException {
        try {
            URLConnection con = url.openConnection();
            int len = con.getContentLength();
            InputStream in = con.getInputStream();
            try {
                if(len<0) {
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    byte[] buf = new byte[1024];
                    int sz;
                    while((sz=in.read(buf))>=0)
                        baos.write(buf,0,sz);
                    return baos.toByteArray();
                } else {
                    byte[] r = new byte[len];
                    new DataInputStream(in).readFully(r);
                    return r;
                }
            } finally {
                in.close();
            }
        } catch (IOException e) {
            IOException x = new IOException("Failed to read " + url);
            x.initCause(e);
            throw x;
        }
    }

    public String getName() {
        return toString();
    }

    public String[] getPublicInterfaces() {
        return EMPTY_STRING_ARRAY;
    }

    public ModuleDependency[] getDependencies() {
        return EMPTY_MODULE_DEFINITIONS_ARRAY;
    }

    public URI[] getLocations() {
        return EMPTY_URI_ARRAY;
    }

    public String getVersion() {
        return "1.0.0";
    }

    public String getImportPolicyClassName() {
        return null;
    }

    public String getLifecyclePolicyClassName() {
        return null;
    }

    public Manifest getManifest() {
        return manifest;
    }

    public ModuleMetadata getMetadata() {
        return metadata;
    }

    private static final String[] EMPTY_STRING_ARRAY = new String[0];
    private static final ModuleDependency[] EMPTY_MODULE_DEFINITIONS_ARRAY = new ModuleDependency[0];
    private static final URI[] EMPTY_URI_ARRAY = new URI[0];
}