/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.core;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.PlatformObject;
import org.eclipse.dltk.core.IArchive;
import org.eclipse.dltk.core.IArchiveEntry;
import org.eclipse.dltk.core.IModelStatusConstants;
import org.eclipse.dltk.core.ModelException;

public class ArchiveEntryFile extends PlatformObject implements IStorage {

	private String entryName;
	private String zipName;
	private IPath path;
	private IResource zipResource;
	private ArchiveProjectFragment archiveProjectFragment;

	public ArchiveEntryFile(String entryName, String zipName,
			IPath parentRelativePath, IResource zipResource,
			ArchiveProjectFragment archiveProjectFragment) {
		this.entryName = entryName;
		this.zipName = zipName;
		this.path = parentRelativePath;
		this.zipResource = zipResource;
		this.archiveProjectFragment = archiveProjectFragment;
	}

	@Override
	public InputStream getContents() throws CoreException {
		try {
			if (ModelManager.ZIP_ACCESS_VERBOSE) {
				System.out
						.println("(" + Thread.currentThread() + ") [JarEntryFile.getContents()] Creating ZipFile on " + this.zipName); //$NON-NLS-1$	//$NON-NLS-2$
			}
			IArchive zipFile = null;
			InputStream inputStream = null;
			try {
				if (zipResource == null) {
					zipFile = ModelManager.getModelManager().getArchive(
							new Path(zipName), archiveProjectFragment);
				} else {
					zipFile = ModelManager.getModelManager().getArchive(
							zipResource.getLocation(), archiveProjectFragment);
				}
				IArchiveEntry zipEntry = zipFile.getArchiveEntry(this.path
						.append(this.entryName).toString());
				if (zipEntry == null) {
					throw new ModelException(new ModelStatus(
							IModelStatusConstants.INVALID_PATH, this.entryName));
				}

				inputStream = zipFile.getInputStream(zipEntry);
				final int entrySize = (int) zipEntry.getSize();
				if (entrySize >= 0) {
					final byte[] buf = new byte[entrySize];
					int offset = 0;
					int len;
					while (entrySize > offset
							&& (len = inputStream.read(buf, offset, entrySize
									- offset)) > 0) {
						offset += len;
					}
					return new ByteArrayInputStream(buf, 0, offset);
				} else {
					byte[] buf = new byte[1024];
					int len;
					ByteArrayOutputStream arrayOut = new ByteArrayOutputStream();
					while ((len = inputStream.read(buf)) > 0) {
						arrayOut.write(buf, 0, len);
					}
					return new ByteArrayInputStream(arrayOut.toByteArray());
				}
			} finally {
				if (inputStream != null) {
					inputStream.close();
				}
				ModelManager.getModelManager().closeArchive(zipFile);
			}
		} catch (IOException e) {
			throw new ModelException(e, IModelStatusConstants.IO_EXCEPTION);
		}
	}

	@Override
	public IPath getFullPath() {
		return path.append(this.entryName);
	}

	@Override
	public String getName() {
		return new Path(this.entryName).lastSegment();
	}

	@Override
	public boolean isReadOnly() {
		return true;
	}

	@Override
	public String toString() {
		return "JarEntryFile[" + this.zipName + "::" + this.entryName + "]"; //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-1$
	}
}