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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.batch;
  12
  13 import java.io.File;
  14 import java.util.Hashtable;
  15
  16 import net.sourceforge.phpdt.internal.compiler.classfmt.ClassFileReader;
  17 import net.sourceforge.phpdt.internal.compiler.env.NameEnvironmentAnswer;
  18
  19 public class ClasspathDirectory implements FileSystem.Classpath {
  20
  21 String path;
  22 Hashtable directoryCache;
  23 String[] missingPackageHolder = new String[1];
  24 String encoding;
  25 public int mode; // ability to only consider one kind of files (source vs. binaries), by default use both
  26
  27 public static final int SOURCE = 1;
  28 public static final int BINARY = 2;
  29
  30 ClasspathDirectory(File directory, String encoding, int mode) {
  31         this.mode = mode;
  32         this.path = directory.getAbsolutePath();
  33         if (!path.endsWith(File.separator))
  34                 this.path += File.separator;
  35         this.directoryCache = new Hashtable(11);
  36         this.encoding = encoding;
  37 }
  38
  39 ClasspathDirectory(File directory, String encoding) {
  40         this(directory, encoding, SOURCE | BINARY); // by default consider both sources and binaries
  41 }
  42
  43 String[] directoryList(String qualifiedPackageName) {
  44         String[] dirList = (String[]) directoryCache.get(qualifiedPackageName);
  45         if (dirList == missingPackageHolder) return null; // package exists in another classpath directory or jar
  46         if (dirList != null) return dirList;
  47
  48         File dir = new File(path + qualifiedPackageName);
  49         notFound : if (dir != null && dir.isDirectory()) {
  50                 // must protect against a case insensitive File call
  51                 // walk the qualifiedPackageName backwards looking for an uppercase character before the '/'
  52                 int index = qualifiedPackageName.length();
  53                 int last = qualifiedPackageName.lastIndexOf(File.separatorChar);
  54                 while (--index > last && !Character.isUpperCase(qualifiedPackageName.charAt(index))) {}
  55                 if (index > last) {
  56                         if (last == -1) {
  57                                 if (!doesFileExist(qualifiedPackageName, ""))  //$NON-NLS-1$
  58                                         break notFound;
  59                         } else {
  60                                 String packageName = qualifiedPackageName.substring(last + 1);
  61                                 String parentPackage = qualifiedPackageName.substring(0, last);
  62                                 if (!doesFileExist(packageName, parentPackage))
  63                                         break notFound;
  64                         }
  65                 }
  66                 if ((dirList = dir.list()) == null)
  67                         dirList = new String[0];
  68                 directoryCache.put(qualifiedPackageName, dirList);
  69                 return dirList;
  70         }
  71         directoryCache.put(qualifiedPackageName, missingPackageHolder);
  72         return null;
  73 }
  74 boolean doesFileExist(String fileName, String qualifiedPackageName) {
  75         String[] dirList = directoryList(qualifiedPackageName);
  76         if (dirList == null) return false; // most common case
  77
  78         for (int i = dirList.length; --i >= 0;)
  79                 if (fileName.equals(dirList[i]))
  80                         return true;
  81         return false;
  82 }
  83 public NameEnvironmentAnswer findClass(char[] typeName, String qualifiedPackageName, String qualifiedBinaryFileName) {
  84         if (!isPackage(qualifiedPackageName)) return null; // most common case
  85
  86         String fileName = new String(typeName);
  87         boolean binaryExists = ((this.mode & BINARY) != 0) && doesFileExist(fileName + ".class", qualifiedPackageName); //$NON-NLS-1$
  88         boolean sourceExists = ((this.mode & SOURCE) != 0) && doesFileExist(fileName + ".java", qualifiedPackageName); //$NON-NLS-1$
  89         if (sourceExists) {
  90                 String fullSourcePath = path + qualifiedBinaryFileName.substring(0, qualifiedBinaryFileName.length() - 6)  + ".java"; //$NON-NLS-1$
  91                 if (!binaryExists)
  92                         return new NameEnvironmentAnswer(new CompilationUnit(null, fullSourcePath, this.encoding));
  93
  94                 String fullBinaryPath = path + qualifiedBinaryFileName;
  95                 long binaryModified = new File(fullBinaryPath).lastModified();
  96                 long sourceModified = new File(fullSourcePath).lastModified();
  97                 if (sourceModified > binaryModified)
  98                         return new NameEnvironmentAnswer(new CompilationUnit(null, fullSourcePath, this.encoding));
  99         }
 100         if (binaryExists) {
 101                 try {
 102                         ClassFileReader reader = ClassFileReader.read(path + qualifiedBinaryFileName);
 103                         if (reader != null) return new NameEnvironmentAnswer(reader);
 104                 } catch (Exception e) {} // treat as if file is missing
 105         }
 106         return null;
 107 }
 108 public boolean isPackage(String qualifiedPackageName) {
 109         return directoryList(qualifiedPackageName) != null;
 110 }
 111 public void reset() {
 112         this.directoryCache = new Hashtable(11);
 113 }
 114 public String toString() {
 115         return "ClasspathDirectory " + path; //$NON-NLS-1$
 116 }
 117 }