001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: *
023: * Free Software Foundation, Inc.
024: * 59 Temple Place, Suite 330
025: * Boston, MA 02111-1307 USA
026: *
027: * @author Scott Ferguson
028: */
029:
030: package com.caucho.loader.enhancer;
031:
032: import com.caucho.java.WorkDir;
033: import com.caucho.loader.EnvironmentClassLoader;
034: import com.caucho.util.L10N;
035: import com.caucho.vfs.Path;
036:
037: /**
038: * Class loader which checks for changes in class files and automatically
039: * picks up new jars.
040: *
041: * <p>DynamicClassLoaders can be chained creating one virtual class loader.
042: * From the perspective of the JDK, it's all one classloader. Internally,
043: * the class loader chain searches like a classpath.
044: */
045: public class EnhancingClassLoader extends EnvironmentClassLoader {
046: private static final L10N L = new L10N(EnhancingClassLoader.class);
047:
048: private Path _workPath;
049:
050: /**
051: * Creates a new environment class loader.
052: */
053: public EnhancingClassLoader() {
054: this (Thread.currentThread().getContextClassLoader());
055: }
056:
057: /**
058: * Creates a new environment class loader.
059: */
060: public EnhancingClassLoader(ClassLoader parent) {
061: super (parent);
062: }
063:
064: /**
065: * Gets the work path.
066: */
067: public Path getWorkPath() {
068: if (_workPath != null)
069: return _workPath;
070: else
071: return WorkDir.getLocalWorkDir(this );
072: }
073:
074: /**
075: * Sets the work path.
076: */
077: public void setWorkPath(Path workPath) {
078: _workPath = workPath;
079: }
080:
081: /**
082: * Gets the work path.
083: */
084: public final Path getPreWorkPath() {
085: return getWorkPath().lookup("pre-enhance");
086: }
087:
088: /**
089: * Gets the work path.
090: */
091: public final Path getPostWorkPath() {
092: return getWorkPath().lookup("post-enhance");
093: }
094:
095: /**
096: * Initialize the loader.
097: */
098: public void init() {
099: super .init();
100:
101: if (getTransformerList() == null
102: && EnhancerManager.getLocalEnhancer(this ) != null) {
103: EnhancerManager.create(this );
104: }
105: }
106:
107: public String toString() {
108: if (getId() != null)
109: return "EnhancingClassLoader[" + getId() + "]";
110: else
111: return "EnhancingClassLoader" + getLoaders();
112: }
113: }
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