Copyright (c) 2011, 2013 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
/*******************************************************************************
 * Copyright (c) 2011, 2013 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.search.indexing;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.search.IJavaSearchScope;
import org.eclipse.jdt.core.search.SearchEngine;
import org.eclipse.jdt.core.search.SearchParticipant;
import org.eclipse.jdt.internal.compiler.util.Util;
import org.eclipse.jdt.internal.core.index.FileIndexLocation;
import org.eclipse.jdt.internal.core.index.Index;
import org.eclipse.jdt.internal.core.index.IndexLocation;
import org.eclipse.jdt.internal.core.search.JavaSearchDocument;

@SuppressWarnings("rawtypes")
public class DefaultJavaIndexer {
	private static final char JAR_SEPARATOR = IJavaSearchScope.JAR_FILE_ENTRY_SEPARATOR.charAt(0);
	
	public void generateIndexForJar(String pathToJar, String pathToIndexFile) throws IOException {
		File f = new File(pathToJar);
		if (!f.exists()) {
			throw new FileNotFoundException(pathToJar + " not found"); //$NON-NLS-1$
		}
		IndexLocation indexLocation = new FileIndexLocation(new File(pathToIndexFile));
		Index index = new Index(indexLocation, pathToJar, false /*reuse index file*/);
		SearchParticipant participant = SearchEngine.getDefaultSearchParticipant();
		index.separator = JAR_SEPARATOR;
		ZipFile zip = new ZipFile(pathToJar);
		try {
			for (Enumeration e = zip.entries(); e.hasMoreElements();) {
				// iterate each entry to index it
				ZipEntry ze = (ZipEntry) e.nextElement();
				String zipEntryName = ze.getName();
				if (Util.isClassFileName(zipEntryName)) {
					final byte[] classFileBytes = org.eclipse.jdt.internal.compiler.util.Util.getZipEntryByteContent(ze, zip);
					JavaSearchDocument entryDocument = new JavaSearchDocument(ze, new Path(pathToJar), classFileBytes, participant);
					entryDocument.setIndex(index);
					new BinaryIndexer(entryDocument).indexDocument();
				}
			}
			index.save();
		} finally {
			zip.close();
		}
		return;
	}
}