first scanner /parser copied from the jdt java version

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / compiler / batch / ClasspathJar.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/batch/ClasspathJar.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/batch/ClasspathJar.java
new file mode 100644 (file)
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+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/batch/ClasspathJar.java
@@ -0,0 +1,78 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v0.5 
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v05.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ ******************************************************************************/
+package net.sourceforge.phpdt.internal.compiler.batch;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+import net.sourceforge.phpdt.internal.compiler.classfmt.ClassFileReader;
+import net.sourceforge.phpdt.internal.compiler.env.NameEnvironmentAnswer;
+
+public class ClasspathJar implements FileSystem.Classpath {
+       
+ZipFile zipFile;
+Hashtable packageCache;
+boolean closeZipFileAtEnd;
+
+public ClasspathJar(File file) throws IOException {
+       this(new ZipFile(file), true);
+}
+public ClasspathJar(ZipFile zipFile, boolean closeZipFileAtEnd) throws IOException {
+       this.zipFile = zipFile;
+       this.packageCache = null;
+       this.closeZipFileAtEnd = closeZipFileAtEnd;
+}      
+public NameEnvironmentAnswer findClass(char[] typeName, String qualifiedPackageName, String qualifiedBinaryFileName) {
+       if (!isPackage(qualifiedPackageName)) return null; // most common case
+
+       try {
+               ClassFileReader reader = ClassFileReader.read(zipFile, qualifiedBinaryFileName);
+               if (reader != null) return new NameEnvironmentAnswer(reader);
+       } catch (Exception e) {} // treat as if class file is missing
+       return null;
+}
+public boolean isPackage(String qualifiedPackageName) {
+       if (packageCache != null)
+               return packageCache.containsKey(qualifiedPackageName);
+
+       this.packageCache = new Hashtable(41);
+       packageCache.put("", ""); //$NON-NLS-1$ //$NON-NLS-2$
+
+       nextEntry : for (Enumeration e = zipFile.entries(); e.hasMoreElements(); ) {
+               String fileName = ((ZipEntry) e.nextElement()).getName();
+
+               // add the package name & all of its parent packages
+               int last = fileName.lastIndexOf('/');
+               while (last > 0) {
+                       // extract the package name
+                       String packageName = fileName.substring(0, last);
+                       if (packageCache.containsKey(packageName))
+                               continue nextEntry;
+                       packageCache.put(packageName, packageName);
+                       last = packageName.lastIndexOf('/');
+               }
+       }
+       return packageCache.containsKey(qualifiedPackageName);
+}
+public void reset() {
+       if (zipFile != null && closeZipFileAtEnd) {
+               try { zipFile.close(); } catch(IOException e) {}
+       }
+       this.packageCache = null;
+}
+public String toString() {
+       return "Classpath for jar file " + zipFile; //$NON-NLS-1$
+}
+}
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