org.apache.catalina.util.Extension Maven / Gradle / Ivy
/*
* 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.StringTokenizer;
/**
* Utility class that represents either an available "Optional Package"
* (formerly known as "Standard Extension") as described in the manifest
* of a JAR file, or the requirement for such an optional package. It is
* used to support the requirements of the Servlet Specification, version
* 2.3, related to providing shared extensions to all webapps.
*
* In addition, static utility methods are available to scan a manifest
* and return an array of either available or required optional modules
* documented in that manifest.
*
* For more information about optional packages, see the document
* Optional Package Versioning in the documentation bundle for your
* Java2 Standard Edition package, in file
* guide/extensions/versioning.html.
*
* @author Craig McClanahan
* @author Justyna Horwat
* @author Greg Murray
*/
public final class Extension {
// ------------------------------------------------------------- Properties
/**
* The name of the optional package being made available, or required.
*/
private String extensionName = null;
public String getExtensionName() {
return (this.extensionName);
}
public void setExtensionName(String extensionName) {
this.extensionName = extensionName;
}
/**
* The URL from which the most recent version of this optional package
* can be obtained if it is not already installed.
*/
private String implementationURL = null;
public String getImplementationURL() {
return (this.implementationURL);
}
public void setImplementationURL(String implementationURL) {
this.implementationURL = implementationURL;
}
/**
* The name of the company or organization that produced this
* implementation of this optional package.
*/
private String implementationVendor = null;
public String getImplementationVendor() {
return (this.implementationVendor);
}
public void setImplementationVendor(String implementationVendor) {
this.implementationVendor = implementationVendor;
}
/**
* The unique identifier of the company that produced the optional
* package contained in this JAR file.
*/
private String implementationVendorId = null;
public String getImplementationVendorId() {
return (this.implementationVendorId);
}
public void setImplementationVendorId(String implementationVendorId) {
this.implementationVendorId = implementationVendorId;
}
/**
* The version number (dotted decimal notation) for this implementation
* of the optional package.
*/
private String implementationVersion = null;
public String getImplementationVersion() {
return (this.implementationVersion);
}
public void setImplementationVersion(String implementationVersion) {
this.implementationVersion = implementationVersion;
}
/**
* The name of the company or organization that originated the
* specification to which this optional package conforms.
*/
private String specificationVendor = null;
public String getSpecificationVendor() {
return (this.specificationVendor);
}
public void setSpecificationVendor(String specificationVendor) {
this.specificationVendor = specificationVendor;
}
/**
* The version number (dotted decimal notation) of the specification
* to which this optional package conforms.
*/
private String specificationVersion = null;
public String getSpecificationVersion() {
return (this.specificationVersion);
}
public void setSpecificationVersion(String specificationVersion) {
this.specificationVersion = specificationVersion;
}
/**
* fulfilled is true if all the required extension dependencies have been
* satisfied
*/
private boolean fulfilled = false;
public void setFulfilled(boolean fulfilled) {
this.fulfilled = fulfilled;
}
public boolean isFulfilled() {
return fulfilled;
}
// --------------------------------------------------------- Public Methods
/**
* Return true if the specified Extension
* (which represents an optional package required by this application)
* is satisfied by this Extension (which represents an
* optional package that is already installed. Otherwise, return
* false.
*
* @param required Extension of the required optional package
*/
public boolean isCompatibleWith(Extension required) {
// Extension Name must match
if (extensionName == null)
return (false);
if (!extensionName.equals(required.getExtensionName()))
return (false);
// If specified, available specification version must be >= required
if (required.getSpecificationVersion() != null) {
if (!isNewer(specificationVersion,
required.getSpecificationVersion()))
return (false);
}
// If specified, Implementation Vendor ID must match
if (required.getImplementationVendorId() != null) {
if (implementationVendorId == null)
return (false);
if (!implementationVendorId.equals(required
.getImplementationVendorId()))
return (false);
}
// If specified, Implementation version must be >= required
if (required.getImplementationVersion() != null) {
if (!isNewer(implementationVersion,
required.getImplementationVersion()))
return (false);
}
// This available optional package satisfies the requirements
return (true);
}
/**
* Return a String representation of this object.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder("Extension[");
sb.append(extensionName);
if (implementationURL != null) {
sb.append(", implementationURL=");
sb.append(implementationURL);
}
if (implementationVendor != null) {
sb.append(", implementationVendor=");
sb.append(implementationVendor);
}
if (implementationVendorId != null) {
sb.append(", implementationVendorId=");
sb.append(implementationVendorId);
}
if (implementationVersion != null) {
sb.append(", implementationVersion=");
sb.append(implementationVersion);
}
if (specificationVendor != null) {
sb.append(", specificationVendor=");
sb.append(specificationVendor);
}
if (specificationVersion != null) {
sb.append(", specificationVersion=");
sb.append(specificationVersion);
}
sb.append("]");
return (sb.toString());
}
// -------------------------------------------------------- Private Methods
/**
* Return true if the first version number is greater than
* or equal to the second; otherwise return false.
*
* @param first First version number (dotted decimal)
* @param second Second version number (dotted decimal)
*
* @exception NumberFormatException on a malformed version number
*/
private boolean isNewer(String first, String second)
throws NumberFormatException {
if ((first == null) || (second == null))
return (false);
if (first.equals(second))
return (true);
StringTokenizer fTok = new StringTokenizer(first, ".", true);
StringTokenizer sTok = new StringTokenizer(second, ".", true);
int fVersion = 0;
int sVersion = 0;
while (fTok.hasMoreTokens() || sTok.hasMoreTokens()) {
if (fTok.hasMoreTokens())
fVersion = Integer.parseInt(fTok.nextToken());
else
fVersion = 0;
if (sTok.hasMoreTokens())
sVersion = Integer.parseInt(sTok.nextToken());
else
sVersion = 0;
if (fVersion < sVersion)
return (false);
else if (fVersion > sVersion)
return (true);
if (fTok.hasMoreTokens()) // Swallow the periods
fTok.nextToken();
if (sTok.hasMoreTokens())
sTok.nextToken();
}
return (true); // Exact match
}
}