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Tomcat example source code file (ManifestResource.java)

This example Tomcat source code file (ManifestResource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

arraylist, arraylist, extension, extension, extension-name, implementation-url, implementation-version, jar, manifestresource, manifestresource, specification-version, string, string, system, util, war

The Tomcat ManifestResource.java source code

/*
 * 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.catalina.util;

import java.util.Iterator;
import java.util.jar.Manifest;
import java.util.jar.Attributes;
import java.util.ArrayList;

/**
 *  Representation of a Manifest file and its available extensions and
 *  required extensions
 *  
 * @author Greg Murray
 * @author Justyna Horwat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 * 
 */
public class ManifestResource {
    
    // ------------------------------------------------------------- Properties

    // These are the resource types for determining effect error messages
    public static final int SYSTEM = 1;
    public static final int WAR = 2;
    public static final int APPLICATION = 3;
    
    private ArrayList availableExtensions = null;
    private ArrayList requiredExtensions = null;
    
    private String resourceName = null;
    private int resourceType = -1;
        
    public ManifestResource(String resourceName, Manifest manifest, 
                            int resourceType) {
        this.resourceName = resourceName;
        this.resourceType = resourceType;
        processManifest(manifest);
    }
    
    /**
     * Gets the name of the resource
     *
     * @return The name of the resource
     */
    public String getResourceName() {
        return resourceName;
    }

    /**
     * Gets the list of available extensions
     *
     * @return List of available extensions
     */
    public ArrayList getAvailableExtensions() {
        return availableExtensions;
    }
    
    /**
     * Gets the list of required extensions
     *
     * @return List of required extensions
     */
    public ArrayList getRequiredExtensions() {
        return requiredExtensions;   
    }
    
    // --------------------------------------------------------- Public Methods

    /**
     * Gets the number of available extensions
     *
     * @return The number of available extensions
     */
    public int getAvailableExtensionCount() {
        return (availableExtensions != null) ? availableExtensions.size() : 0;
    }
    
    /**
     * Gets the number of required extensions
     *
     * @return The number of required extensions
     */
    public int getRequiredExtensionCount() {
        return (requiredExtensions != null) ? requiredExtensions.size() : 0;
    }
    
    /**
     * Convienience method to check if this <code>ManifestResource
     * has an requires extensions.
     *
     * @return true if required extensions are present
     */
    public boolean requiresExtensions() {
        return (requiredExtensions != null) ? true : false;
    }
    
    /**
     * Returns <code>true if all required extension dependencies
     * have been meet for this <code>ManifestResource object.
     *
     * @return boolean true if all extension dependencies have been satisfied
     */
    public boolean isFulfilled() {
        if (requiredExtensions == null) {
            return false;
        }
        Iterator it = requiredExtensions.iterator();
        while (it.hasNext()) {
            Extension ext = (Extension)it.next();
            if (!ext.isFulfilled()) return false;            
        }
        return true;
    }
    
    public String toString() {

        StringBuffer sb = new StringBuffer("ManifestResource[");
        sb.append(resourceName);

        sb.append(", isFulfilled=");
        sb.append(isFulfilled() +"");
        sb.append(", requiredExtensionCount =");
        sb.append(getRequiredExtensionCount());
        sb.append(", availableExtensionCount=");
        sb.append(getAvailableExtensionCount());
        switch (resourceType) {
            case SYSTEM : sb.append(", resourceType=SYSTEM"); break;
            case WAR : sb.append(", resourceType=WAR"); break;
            case APPLICATION : sb.append(", resourceType=APPLICATION"); break;
        }
        sb.append("]");
        return (sb.toString());
    }


    // -------------------------------------------------------- Private Methods

    private void processManifest(Manifest manifest) {
        availableExtensions = getAvailableExtensions(manifest);
        requiredExtensions = getRequiredExtensions(manifest);
    }
    
    /**
     * Return the set of <code>Extension objects representing optional
     * packages that are required by the application associated with the
     * specified <code>Manifest.
     *
     * @param manifest Manifest to be parsed
     *
     * @return List of required extensions, or null if the application
     * does not require any extensions
     */
    private ArrayList getRequiredExtensions(Manifest manifest) {

        Attributes attributes = manifest.getMainAttributes();
        String names = attributes.getValue("Extension-List");
        if (names == null)
            return null;

        ArrayList extensionList = new ArrayList();
        names += " ";

        while (true) {

            int space = names.indexOf(' ');
            if (space < 0)
                break;
            String name = names.substring(0, space).trim();
            names = names.substring(space + 1);

            String value =
                attributes.getValue(name + "-Extension-Name");
            if (value == null)
                continue;
            Extension extension = new Extension();
            extension.setExtensionName(value);
            extension.setImplementationURL
                (attributes.getValue(name + "-Implementation-URL"));
            extension.setImplementationVendorId
                (attributes.getValue(name + "-Implementation-Vendor-Id"));
            String version = attributes.getValue(name + "-Implementation-Version");
            extension.setImplementationVersion(version);
            extension.setSpecificationVersion
                (attributes.getValue(name + "-Specification-Version"));
            extensionList.add(extension);
        }
        return extensionList;
    }
    
    /**
     * Return the set of <code>Extension objects representing optional
     * packages that are bundled with the application associated with the
     * specified <code>Manifest.
     *
     * @param manifest Manifest to be parsed
     *
     * @return List of available extensions, or null if the web application
     * does not bundle any extensions
     */
    private ArrayList getAvailableExtensions(Manifest manifest) {

        Attributes attributes = manifest.getMainAttributes();
        String name = attributes.getValue("Extension-Name");
        if (name == null)
            return null;

        ArrayList extensionList = new ArrayList();

        Extension extension = new Extension();
        extension.setExtensionName(name);
        extension.setImplementationURL(
            attributes.getValue("Implementation-URL"));
        extension.setImplementationVendor(
            attributes.getValue("Implementation-Vendor"));
        extension.setImplementationVendorId(
            attributes.getValue("Implementation-Vendor-Id"));
        extension.setImplementationVersion(
            attributes.getValue("Implementation-Version"));
        extension.setSpecificationVersion(
            attributes.getValue("Specification-Version"));

        extensionList.add(extension);

        return extensionList;
    }
    
}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat ManifestResource.java source code file:

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