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Posted to dev@ant.apache.org by pe...@apache.org on 2006/12/24 23:52:43 UTC
svn commit: r490082 -
/ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java
Author: peterreilly
Date: Sun Dec 24 14:52:42 2006
New Revision: 490082
URL: http://svn.apache.org/viewvc?view=rev&rev=490082
Log:
Fix BSF path for script
Added:
ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java
Added: ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java
URL: http://svn.apache.org/viewvc/ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java?view=auto&rev=490082
==============================================================================
--- ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java (added)
+++ ant/core/trunk/src/main/org/apache/tools/ant/util/ScriptFixBSFPath.java Sun Dec 24 14:52:42 2006
@@ -0,0 +1,146 @@
+/*
+ * 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 org.apache.tools.ant.AntClassLoader;
+import org.apache.tools.ant.BuildException;
+import java.io.File;
+import java.util.Map;
+import java.util.HashMap;
+
+
+/**
+ * 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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