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/*
* 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.tools.ant.util;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
/**
* A class to modify a classloader to
* support BSF language support.
*/
public class ScriptFixBSFPath {
private static final String UTIL_OPTIONAL_PACKAGE
= "org.apache.tools.ant.util.optional";
private static final String BSF_PACKAGE = "org.apache.bsf";
private static final String BSF_MANAGER = BSF_PACKAGE + ".BSFManager";
private static final String BSF_SCRIPT_RUNNER
= UTIL_OPTIONAL_PACKAGE + ".ScriptRunner";
/**
* The following are languages that have
* scripting engines embedded in bsf.jar.
* The array is converted to a map of
* languagename->classname.
*/
private static final String[] BSF_LANGUAGES =
new String[] {
"js", "org.mozilla.javascript.Scriptable",
"javascript", "org.mozilla.javascript.Scriptable",
"jacl", "tcl.lang.Interp",
"netrexx", "netrexx.lang.Rexx",
"nrx", "netrexx.lang.Rexx",
"jython", "org.python.core.Py",
"py", "org.python.core.Py",
"xslt", "org.apache.xpath.objects.XObject"};
/** A map of languages for which the engine in located in bsf */
private static final Map BSF_LANGUAGE_MAP = new HashMap();
static {
for (int i = 0; i < BSF_LANGUAGES.length; i = i + 2) {
BSF_LANGUAGE_MAP.put(BSF_LANGUAGES[i], BSF_LANGUAGES[i + 1]);
}
}
private File getClassSource(ClassLoader loader, String className) {
return LoaderUtils.getResourceSource(
loader,
LoaderUtils.classNameToResource(className));
}
private File getClassSource(String className) {
return getClassSource(getClass().getClassLoader(), className);
}
/**
* Check if need to mess about with the classloader.
* The class loader will need to be modified for two
* reasons:
* <ol>
* <li>language is at a higher level than bsf for engines in bsf,
* move bsf.
* </li>
* <li>bsf is at a higher level than oata.util.optional.ScriptRunner
* </li>
* </ol>
*
* Assume a simple model for the loader:
* thisloader<-customloader
* or
* thisloader
*
* @param loader the classloader to fix.
* @param language the language to use.
*/
public void fixClassLoader(ClassLoader loader, String language) {
if (loader == getClass().getClassLoader()
|| !(loader instanceof AntClassLoader)) {
return;
}
ClassLoader myLoader = getClass().getClassLoader();
AntClassLoader fixLoader = (AntClassLoader) loader;
// Check for location of bsf in this classloader
File bsfSource = getClassSource(BSF_MANAGER);
// If bsf is not in the classloader for this, need to move
// runner.
boolean needMoveRunner = (bsfSource == null);
// Check for location of language
String languageClassName = (String) BSF_LANGUAGE_MAP.get(language);
// Check if need to need to move bsf
boolean needMoveBsf =
bsfSource != null
&& languageClassName != null
&& !LoaderUtils.classExists(myLoader, languageClassName)
&& LoaderUtils.classExists(loader, languageClassName);
// Update need to move runner
needMoveRunner = needMoveRunner || needMoveBsf;
// Check if bsf in place
if (bsfSource == null) {
bsfSource = getClassSource(loader, BSF_MANAGER);
}
if (bsfSource == null) {
throw new BuildException(
"Unable to find BSF classes for scripting");
}
if (needMoveBsf) {
fixLoader.addPathComponent(bsfSource);
fixLoader.addLoaderPackageRoot(BSF_PACKAGE);
}
if (needMoveRunner) {
fixLoader.addPathComponent(
LoaderUtils.getResourceSource(
fixLoader,
LoaderUtils.classNameToResource(BSF_SCRIPT_RUNNER)));
fixLoader.addLoaderPackageRoot(UTIL_OPTIONAL_PACKAGE);
}
}
}
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