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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package dex.reader.util;
     18 
     19 import java.io.IOException;
     20 import java.util.Arrays;
     21 import java.util.Collections;
     22 import java.util.HashSet;
     23 import java.util.Set;
     24 
     25 import javax.tools.Diagnostic;
     26 import javax.tools.DiagnosticCollector;
     27 import javax.tools.JavaCompiler;
     28 import javax.tools.JavaFileObject;
     29 import javax.tools.StandardJavaFileManager;
     30 import javax.tools.ToolProvider;
     31 import javax.tools.JavaCompiler.CompilationTask;
     32 
     33 import com.android.dx.dex.cf.CfOptions;
     34 import com.android.dx.dex.cf.CfTranslator;
     35 import com.android.dx.dex.file.ClassDefItem;
     36 import com.android.dx.dex.file.DexFile;
     37 
     38 import dex.reader.DexBuffer;
     39 import dex.reader.DexFileReader;
     40 
     41 public class JavaSourceToDexUtil {
     42 
     43     public dex.structure.DexFile getFrom(JavaSource source) throws IOException{
     44         return getAllFrom(Collections.singleton(source));
     45     }
     46 
     47     public dex.structure.DexFile getFrom(JavaSource... source) throws IOException{
     48         return getAllFrom(new HashSet<JavaSource>(Arrays.asList(source)));
     49     }
     50 
     51     public dex.structure.DexFile getAllFrom(Set<JavaSource> sources) throws IOException{
     52         return getFrom(sources, null);
     53     }
     54 
     55     /**
     56      * Converts java source code to a {@link dex.structure.DexFile} loaded by
     57      * {@link DexFileReader}. Converts only classes with the specified name in
     58      * classesToDex or all classes if classesToDex is null.
     59      *
     60      * @throws IOException
     61      */
     62     public dex.structure.DexFile getFrom(Set<JavaSource> sources,
     63             Set<String> classesToDex) throws IOException {
     64         Set<MemoryByteCode> byteCodeInMemory = compileToByteCode(sources);
     65 
     66         byte[] dexCode = convertToDexCode(byteCodeInMemory, classesToDex);
     67         DexBuffer dexBuffer = new DexBuffer(dexCode);
     68         DexFileReader reader = new DexFileReader();
     69         return reader.read(dexBuffer);
     70     }
     71 
     72 
     73     private byte[] convertToDexCode(Set<MemoryByteCode> byteCodeInMemory, Set<String> classNamesToDex) throws IOException {
     74         CfOptions cfOptions = new CfOptions();
     75         DexFile dexFile = new DexFile();
     76         for (MemoryByteCode memoryByteCode : byteCodeInMemory) {
     77             if(classNamesToDex == null || classNamesToDex.contains(memoryByteCode.getName())) {
     78             ClassDefItem classDefItem = CfTranslator.translate(memoryByteCode.getName().replace('.', '/') +".class", memoryByteCode.getBytes(), cfOptions);
     79             dexFile.add(classDefItem);
     80             }
     81         }
     82         return dexFile.toDex(null, false);
     83     }
     84 
     85 
     86     public Set<MemoryByteCode> compileToByteCode(Set<JavaSource> source) {
     87         JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
     88         DiagnosticCollector<JavaFileObject> diacol = new DiagnosticCollector<JavaFileObject>();
     89         StandardJavaFileManager sjfm = javac.getStandardFileManager(diacol,
     90                 null, null);
     91         SpecialJavaFileManager xfm = new SpecialJavaFileManager(sjfm);
     92 
     93         CompilationTask compile = javac.getTask(null, xfm, diacol, Arrays
     94                 .asList(new String[] {"-classpath", "."}), null, source);
     95         boolean success = compile.call();
     96         if(!success) {
     97         StringBuilder errorMessage = new StringBuilder();
     98             for (Diagnostic<? extends JavaFileObject> dia : diacol.getDiagnostics()) {
     99                 errorMessage.append(dia);
    100             }
    101             throw new IllegalStateException(errorMessage.toString());
    102         }
    103         return xfm.getAllMemoryByteCodes();
    104     }
    105 }
    106 
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