001: /***
002: * Retrotranslator: a Java bytecode transformer that translates Java classes
003: * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
004: *
005: * Copyright (c) 2005 - 2008 Taras Puchko
006: * All rights reserved.
007: *
008: * Redistribution and use in source and binary forms, with or without
009: * modification, are permitted provided that the following conditions
010: * are met:
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in the
015: * documentation and/or other materials provided with the distribution.
016: * 3. Neither the name of the copyright holders nor the names of its
017: * contributors may be used to endorse or promote products derived from
018: * this software without specific prior written permission.
019: *
020: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
021: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
022: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
023: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
024: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
025: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
026: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
027: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
028: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
029: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
030: * THE POSSIBILITY OF SUCH DAMAGE.
031: */package net.sf.retrotranslator.transformer;
032:
033: import java.util.*;
034: import net.sf.retrotranslator.runtime.impl.RuntimeTools;
035:
036: /**
037: * @author Taras Puchko
038: */
039: class EmbeddingConverter {
040:
041: private final String embeddingPrefix;
042: private final SystemLogger logger;
043: private final List<String> prefixes = new ArrayList<String>();
044: private final Map<String, Boolean> classNames = new HashMap<String, Boolean>();
045: private final TargetEnvironment environment;
046: private int countEmbedded;
047:
048: public EmbeddingConverter(ClassVersion target, String embed,
049: TargetEnvironment environment, SystemLogger logger) {
050: this .environment = environment;
051: embeddingPrefix = makePrefix(embed);
052: this .logger = logger;
053: for (String packageName : environment.readRegistry("embed",
054: target)) {
055: prefixes.add(makePrefix(packageName));
056: }
057: }
058:
059: private static String makePrefix(String packageName) {
060: return packageName.length() == 0 || packageName.equals(".") ? ""
061: : packageName.replace('.', '/') + '/';
062: }
063:
064: public String convertFileName(String fileName) {
065: return isEmbedded(fileName) ? embeddingPrefix + fileName
066: : fileName;
067: }
068:
069: public String convertClassName(String className) {
070: if (isEmbedded(className)) {
071: if (!classNames.containsKey(className)) {
072: classNames.put(className, Boolean.FALSE);
073: }
074: return embeddingPrefix + className;
075: } else {
076: return className;
077: }
078: }
079:
080: private boolean isEmbedded(String name) {
081: for (String prefix : prefixes) {
082: if (name.startsWith(prefix)) {
083: return true;
084: }
085: }
086: return false;
087: }
088:
089: public void embed(FileContainer destination,
090: ClassTransformer transformer) {
091: if (classNames.isEmpty()) {
092: logger.log(new Message(Level.INFO, "Embedding skipped."));
093: return;
094: }
095: logger.log(new Message(Level.INFO,
096: "Embedding backported classes."));
097: countEmbedded = 0;
098: boolean modified;
099: do {
100: modified = false;
101: for (Map.Entry<String, Boolean> entry : new HashMap<String, Boolean>(
102: classNames).entrySet()) {
103: modified |= embed(entry, destination, transformer);
104: }
105: } while (modified);
106: logger.log(new Message(Level.INFO, "Embedded " + countEmbedded
107: + " class(es)."));
108: classNames.clear();
109: }
110:
111: private boolean embed(Map.Entry<String, Boolean> entry,
112: FileContainer destination, ClassTransformer transformer) {
113: if (entry.getValue()) {
114: return false;
115: }
116: String name = entry.getKey();
117: String fileName = name + RuntimeTools.CLASS_EXTENSION;
118: logger.log(new Message(Level.VERBOSE, "Embedding", null,
119: fileName));
120: classNames.put(name, Boolean.TRUE);
121: byte[] content = environment.getClassContent(name);
122: if (content != null) {
123: destination.putEntry(convertFileName(fileName), transformer
124: .transform(content, 0, content.length), true);
125: countEmbedded++;
126: return true;
127: } else {
128: logger.log(new Message(Level.WARNING,
129: "Cannot find to embed: " + name));
130: return false;
131: }
132: }
133:
134: }
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