/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.jdt.core.IJarEntryResource;
import org.eclipse.jdt.core.IJavaModelStatusConstants;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.compiler.util.JRTUtil;
import org.eclipse.jdt.internal.compiler.util.Util;

/**
 * A jar entry that represents a non-java file found in a JAR.
 *
 * @see IStorage
 */
public class JarEntryFile  extends JarEntryResource {
	private static final IJarEntryResource[] NO_CHILDREN = new IJarEntryResource[0];
	public JarEntryFile(String simpleName) {
		super(simpleName);
	}

	@Override
	public JarEntryResource clone(Object newParent) {
		JarEntryFile file = new JarEntryFile(this.simpleName);
		file.setParent(newParent);
		return file;
	}

	@Override
	public InputStream getContents() throws CoreException {
		IPackageFragmentRoot root = getPackageFragmentRoot();
		if (Util.isJrt(root.getPath().toOSString())) {
			try {
				IPath rootPath = root.getPath();
				Object target = JavaModel.getTarget(rootPath, false);
				if (target != null && target instanceof File) {
					return JRTUtil.getContentFromJrt((File) target, getEntryName(), root.getElementName());
				}
			} catch (IOException e) {
				throw new JavaModelException(e, IJavaModelStatusConstants.IO_EXCEPTION);
			}
			return null;
		} else {
			ZipFile zipFile = null;
			try {
				zipFile = getZipFile();
				if (JavaModelManager.ZIP_ACCESS_VERBOSE) {
					JavaModelManager.trace("(" + Thread.currentThread() + ") [JarEntryFile.getContents()] Creating ZipFile on " +zipFile.getName()); //$NON-NLS-1$	//$NON-NLS-2$
				}
				String entryName = getEntryName();
				ZipEntry zipEntry = zipFile.getEntry(entryName);
				if (zipEntry == null){
					throw new JavaModelException(new JavaModelStatus(IJavaModelStatusConstants.INVALID_PATH, entryName));
				}
				byte[] contents = Util.getZipEntryByteContent(zipEntry, zipFile);
				return new ByteArrayInputStream(contents);
			} catch (IOException e){
				throw new JavaModelException(e, IJavaModelStatusConstants.IO_EXCEPTION);
			} finally {
				// avoid leaking ZipFiles
				JavaModelManager.getJavaModelManager().closeZipFile(zipFile);
			}
		}
	}

	@Override
	public IJarEntryResource[] getChildren() {
		return NO_CHILDREN;
	}

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

	@Override
	public String toString() {
		return "JarEntryFile["+getEntryName()+"]"; //$NON-NLS-2$ //$NON-NLS-1$
	}
}
