platform.launcher.storageless.parent/platform.launcher.storageless/src/main/java/org/apache/clerezza/platform/launcher/MavenArtifactDesc.java

/*
 * 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.
 */

package org.apache.clerezza.platform.launcher;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.wymiwyg.commons.util.dirbrowser.PathNode;

/**
 * Maven Artifact Description
 * 
 * @author daniel
 */
class MavenArtifactDesc implements Comparable<MavenArtifactDesc> {

    //one of these is null
    URL bundleUrl;
    PathNode pathNode;
    String groupId;
    String artifactId;
    String version;

    /**
     * Constructor with bundle URL.
     *
     * @param groupId    the group id.
     * @param artifactId    the artifact id.
     * @param version    the version.
     * @param bundleUrl    the bundle URL.
     */
    MavenArtifactDesc(String groupId, String artifactId, String version, URL bundleUrl) {
        this.groupId = groupId;
        this.artifactId = artifactId;
        this.version = version;
        this.bundleUrl = bundleUrl;
    }

    /**
     * Constructor with bundle path.
     * 
     * @param groupId    the group id.
     * @param artifactId    the artifact id.
     * @param version    the version.
     * @param pathNode    the bundle path node.
     */
    MavenArtifactDesc(String groupId, String artifactId, String version, PathNode pathNode) {
        this.groupId = groupId;
        this.artifactId = artifactId;
        this.version = version;
        this.pathNode = pathNode;
    }

    /**
     * Parse Maven Artifact Description from an URL.
     *
     * @param bundleUrl the URL.
     * @return    A new MavenArtifactDesc object.
     */
    static MavenArtifactDesc parseFromURL(URL bundleUrl) {
        String string = bundleUrl.toString();
        int posSlashM1 = string.lastIndexOf('/');
        int posSlashM2 = string.lastIndexOf('/', posSlashM1 - 1);
        int posSlashM3 = string.lastIndexOf('/', posSlashM2 - 1);
        String version = string.substring(posSlashM2 + 1, posSlashM1);
        String artifactId = string.substring(posSlashM3 + 1, posSlashM2);
        String groupId = getGroupId(string.substring(0, posSlashM3));
        return new MavenArtifactDesc(groupId, artifactId, version, bundleUrl);
    }

    /**
     * Parse Maven Artifact Description from a path node.
     *
     * @param pathNode    The path node.
     * @return    A new MavenArtifactDesc object.
     */
    static MavenArtifactDesc parseFromPath(PathNode pathNode) {
        String string = pathNode.getPath();
        int posSlashM1 = string.lastIndexOf('/');
        int posSlashM2 = string.lastIndexOf('/', posSlashM1 - 1);
        int posSlashM3 = string.lastIndexOf('/', posSlashM2 - 1);
        String version = string.substring(posSlashM2 + 1, posSlashM1);
        String artifactId = string.substring(posSlashM3 + 1, posSlashM2);
        String groupId = getGroupId(string.substring(0, posSlashM3));
        return new MavenArtifactDesc(groupId, artifactId, version, pathNode);
    }

    /**
     * Assembles group-id from the diretories after "bundles/"
     *
     * @param string a path-string. Must contain "bundles/".
     */
    static String getGroupId(String string) {
        int startPos = string.indexOf("bundles/") + 8;
        startPos = string.indexOf('/', startPos) + 1;
        return string.substring(startPos).replace('/', '.');
    }
    
    /**
     * Returns an URI in the form "mvn:groupId/artifactId/version"
     *
     * @return the URI.
     */
    public String getShortUri() {
        return "mvn:" + groupId + "/" + artifactId;
    }

    /**
     * Returns a string representation of this object in the form
     * "mvn:groupId/artifactId/version"
     *
     * @return    the string representation of this Maven Artifact Description.
     */
    @Override
    public String toString() {
        return "mvn:" + groupId + "/" + artifactId + "/" + version;
    }

    InputStream getInputStream() throws IOException {
        if (bundleUrl == null) {
            return pathNode.getInputStream();
        }
        return bundleUrl.openStream();
    }

    @Override
    public int compareTo(MavenArtifactDesc o) {
        return toString().compareTo(o.toString());
    }
}