Source Code Cross Referenced for EmbeddingConverter.java in  » Development » Retrotranslator » net » sf » retrotranslator » transformer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » Retrotranslator » net.sf.retrotranslator.transformer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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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