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package org.apache.catalina.util;
import java.util.HashMap;
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: 1.3 $ $Date: 2007/05/05 05:32:30 $
*
*/
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 HashMap 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 map of available extensions
*
* @return Map of available extensions
*/
public HashMap 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</code>
* has an requires extensions.
*
* @return true if required extensions are present
*/
public boolean requiresExtensions() {
return (requiredExtensions != null) ? true : false;
}
/**
* Convienience method to check if this <code>ManifestResource</code>
* has an extension available.
*
* @param key extension identifier
*
* @return true if extension available
*/
public boolean containsExtension(String key) {
return (availableExtensions != null) ?
availableExtensions.containsKey(key) : false;
}
/**
* Returns <code>true</code> if all required extension dependencies
* have been meet for this <code>ManifestResource</code> 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</code> objects representing optional
* packages that are required by the application associated with the
* specified <code>Manifest</code>.
*
* @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</code> objects representing optional
* packages that are bundled with the application associated with the
* specified <code>Manifest</code>.
*
* @param manifest Manifest to be parsed
*
* @return Map of available extensions, or null if the web application
* does not bundle any extensions
*/
private HashMap getAvailableExtensions(Manifest manifest) {
Attributes attributes = manifest.getMainAttributes();
String name = attributes.getValue("Extension-Name");
if (name == null)
return null;
HashMap extensionMap = new HashMap();
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"));
if (!extensionMap.containsKey(extension.getUniqueId())) {
extensionMap.put(extension.getUniqueId(), extension);
}
return extensionMap;
}
}
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