/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.classfile.impl;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import edu.umd.cs.findbugs.classfile.ICodeBaseEntry;
import edu.umd.cs.findbugs.classfile.ICodeBaseIterator;
import edu.umd.cs.findbugs.classfile.ICodeBaseLocator;
import edu.umd.cs.findbugs.classfile.ResourceNotFoundException;
import edu.umd.cs.findbugs.io.IO;
import edu.umd.cs.findbugs.util.MapCache;

/**
 * Implementation of ICodeBase to read from a zip file or jar file.
 * 
 * @author David Hovemeyer
 */
public class ZipInputStreamCodeBase extends AbstractScannableCodeBase {
	final static boolean DEBUG = true;

	final File file;

	final MapCache<String, ZipInputStreamCodeBaseEntry> map = new MapCache<String, ZipInputStreamCodeBaseEntry>(10000);

	final HashSet<String> entries = new HashSet<String>();

	/**
	 * Constructor.
	 * 
	 * @param codeBaseLocator the codebase locator for this codebase
	 * @param file the File containing the zip file (may be a temp file
	 *         if the codebase was copied from a nested zipfile in
	 *         another codebase)
	 */
	public ZipInputStreamCodeBase(ICodeBaseLocator codeBaseLocator, File file) throws IOException {
		super(codeBaseLocator);

		this.file = file;
		setLastModifiedTime(file.lastModified());
		ZipInputStream zis = new ZipInputStream(new FileInputStream(file));
		ZipEntry ze;
		if (DEBUG)
			System.out.println("Reading zip input stream " + file);
		int count = 0;
		while ((ze = zis.getNextEntry()) != null) {
			if (!ze.isDirectory() && (ze.getName().equals("META-INF/MANIFEST.MF") || ze.getName().endsWith(".class"))) {
				entries.add(ze.getName());
				if (ze.getName().equals("META-INF/MANIFEST.MF")) 
					map.put(ze.getName(), build(zis, ze));
			}
			zis.closeEntry();

		}
		if (DEBUG)
			System.out.println("Done with zip input stream " + file);

	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBase#lookupResource(java.lang.String)
	 */
	public ICodeBaseEntry lookupResource(String resourceName) throws ResourceNotFoundException {

		// Translate resource name, in case a resource name
		// has been overridden and the resource is being accessed
		// using the overridden name.
		resourceName = translateResourceName(resourceName);
		if (!entries.contains(resourceName))
			throw new ResourceNotFoundException(resourceName);

		try {
			ZipInputStreamCodeBaseEntry z = map.get(resourceName);
			if (z != null)
				return z;
			ZipInputStream zis = new ZipInputStream(new FileInputStream(file));
			ZipEntry ze;
			boolean found = false;
			int countDown = 20;
			while ((ze = zis.getNextEntry()) != null && countDown >= 0) {
				if (ze.getName().equals(resourceName))
					found = true;
				if (found) {
					countDown--;
					if (map.containsKey(ze.getName()))
						continue;
					z = build(zis, ze);
					map.put(ze.getName(), z);
				}
				zis.closeEntry();
			}
			z = map.get(resourceName);
			if (z == null)
				throw new AssertionError("Could not find " + resourceName);
			return z;
		} catch (IOException e) {
			throw new ResourceNotFoundException(resourceName);
		}
	}

	ZipInputStreamCodeBaseEntry build(ZipInputStream zis, ZipEntry ze) throws IOException {
		long sz = ze.getSize();
		ByteArrayOutputStream out;
		if (sz < 0 || sz > Integer.MAX_VALUE)
			out = new ByteArrayOutputStream();
		else
			out = new ByteArrayOutputStream((int) sz);
		IO.copy(zis, out);
		byte[] bytes = out.toByteArray();
		setLastModifiedTime(ze.getTime());
		return new ZipInputStreamCodeBaseEntry(this, ze, bytes);
	}

	class MyIterator implements ICodeBaseIterator {
		ZipInputStream zis;

		ZipEntry ze;

		MyIterator() {
			try {
				zis = new ZipInputStream(new FileInputStream(file));
				ze = zis.getNextEntry();
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}

		private void getNextEntry() throws IOException {
			ze = zis.getNextEntry();
			if (ze == null)
				zis.close();
		}

		/* (non-Javadoc)
		 * @see edu.umd.cs.findbugs.classfile.ICodeBaseIterator#hasNext()
		 */
		public boolean hasNext() throws InterruptedException {
			if (Thread.interrupted())
				throw new InterruptedException();

			return ze != null;
		}

		/* (non-Javadoc)
		 * @see edu.umd.cs.findbugs.classfile.ICodeBaseIterator#next()
		 */
		public ICodeBaseEntry next() throws InterruptedException {
			try {
				if (Thread.interrupted())
					throw new InterruptedException();
				ZipInputStreamCodeBaseEntry z = build(zis, ze);
				zis.closeEntry();
				getNextEntry();
				return z;
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}

	}

	public ICodeBaseIterator iterator() {
		return new MyIterator();
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBase#getPathName()
	 */
	public String getPathName() {
		return file.getName();
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBase#close()
	 */
	public void close() {

	}

	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return file.getName();
	}
}

@@ -1671,19 +1671,20 @@
 DEBUG = 
-tru
+fals
 e;%0A%0A%09fin

remove debugging code