jdtcompiler.java

业界著名的tomcat服务器的最新6.0的源代码。

/*
 * 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.jasper.compiler;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;

import org.apache.jasper.JasperException;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.internal.compiler.ClassFile;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.Compiler;
import org.eclipse.jdt.internal.compiler.DefaultErrorHandlingPolicies;
import org.eclipse.jdt.internal.compiler.ICompilerRequestor;
import org.eclipse.jdt.internal.compiler.IErrorHandlingPolicy;
import org.eclipse.jdt.internal.compiler.IProblemFactory;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.eclipse.jdt.internal.compiler.env.INameEnvironment;
import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;

/**
 * JDT class compiler. This compiler will load source dependencies from the
 * context classloader, reducing dramatically disk access during 
 * the compilation process.
 *
 * @author Cocoon2
 * @author Remy Maucherat
 */
public class JDTCompiler extends org.apache.jasper.compiler.Compiler {

    
    /** 
     * Compile the servlet from .java file to .class file
     */
    protected void generateClass(String[] smap)
        throws FileNotFoundException, JasperException, Exception {

        long t1 = 0;
        if (log.isDebugEnabled()) {
            t1 = System.currentTimeMillis();
        }
        
        final String sourceFile = ctxt.getServletJavaFileName();
        final String outputDir = ctxt.getOptions().getScratchDir().getAbsolutePath();
        String packageName = ctxt.getServletPackageName();
        final String targetClassName = 
            ((packageName.length() != 0) ? (packageName + ".") : "") 
                    + ctxt.getServletClassName();
        final ClassLoader classLoader = ctxt.getJspLoader();
        String[] fileNames = new String[] {sourceFile};
        String[] classNames = new String[] {targetClassName};
        final ArrayList problemList = new ArrayList();
        
        class CompilationUnit implements ICompilationUnit {

            String className;
            String sourceFile;

            CompilationUnit(String sourceFile, String className) {
                this.className = className;
                this.sourceFile = sourceFile;
            }

            public char[] getFileName() {
                return sourceFile.toCharArray();
            }
            
            public char[] getContents() {
                char[] result = null;
                try {
                    InputStreamReader isReader =
                        new InputStreamReader(new FileInputStream(sourceFile),
                                ctxt.getOptions().getJavaEncoding());
                    Reader reader = new BufferedReader(isReader);
                    if (reader != null) {
                        char[] chars = new char[8192];
                        StringBuffer buf = new StringBuffer();
                        int count;
                        while ((count = reader.read(chars, 0, 
                                                    chars.length)) > 0) {
                            buf.append(chars, 0, count);
                        }
                        result = new char[buf.length()];
                        buf.getChars(0, result.length, result, 0);
                    }
                } catch (IOException e) {
                    log.error("Compilation error", e);
                }
                return result;
            }
            
            public char[] getMainTypeName() {
                int dot = className.lastIndexOf('.');
                if (dot > 0) {
                    return className.substring(dot + 1).toCharArray();
                }
                return className.toCharArray();
            }
            
            public char[][] getPackageName() {
                StringTokenizer izer = 
                    new StringTokenizer(className, ".");
                char[][] result = new char[izer.countTokens()-1][];
                for (int i = 0; i < result.length; i++) {
                    String tok = izer.nextToken();
                    result[i] = tok.toCharArray();
                }
                return result;
            }
        }

        final INameEnvironment env = new INameEnvironment() {

                public NameEnvironmentAnswer 
                    findType(char[][] compoundTypeName) {
                    String result = "";
                    String sep = "";
                    for (int i = 0; i < compoundTypeName.length; i++) {
                        result += sep;
                        result += new String(compoundTypeName[i]);
                        sep = ".";
                    }
                    return findType(result);
                }

                public NameEnvironmentAnswer 
                    findType(char[] typeName, 
                             char[][] packageName) {
                        String result = "";
                        String sep = "";
                        for (int i = 0; i < packageName.length; i++) {
                            result += sep;
                            result += new String(packageName[i]);
                            sep = ".";
                        }
                        result += sep;
                        result += new String(typeName);
                        return findType(result);
                }
                
                private NameEnvironmentAnswer findType(String className) {

                    InputStream is = null;
                    try {
                        if (className.equals(targetClassName)) {
                            ICompilationUnit compilationUnit = 
                                new CompilationUnit(sourceFile, className);
                            return 
                                new NameEnvironmentAnswer(compilationUnit, null);
                        }
                        String resourceName = 
                            className.replace('.', '/') + ".class";
                        is = classLoader.getResourceAsStream(resourceName);
                        if (is != null) {
                            byte[] classBytes;
                            byte[] buf = new byte[8192];
                            ByteArrayOutputStream baos = 
                                new ByteArrayOutputStream(buf.length);
                            int count;
                            while ((count = is.read(buf, 0, buf.length)) > 0) {
                                baos.write(buf, 0, count);
                            }
                            baos.flush();
                            classBytes = baos.toByteArray();
                            char[] fileName = className.toCharArray();
                            ClassFileReader classFileReader = 
                                new ClassFileReader(classBytes, fileName, 
                                                    true);
                            return 
                                new NameEnvironmentAnswer(classFileReader, null);
                        }
                    } catch (IOException exc) {
                        log.error("Compilation error", exc);
                    } catch (org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException exc) {
                        log.error("Compilation error", exc);
                    } finally {
                        if (is != null) {
                            try {
                                is.close();
                            } catch (IOException exc) {
                                // Ignore
                            }
                        }
                    }
                    return null;
                }