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/*******************************************************************************
* Copyright (c) 2000, 2015 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.search.tests;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Plugin;
public class FileTool {
private final static int MAX_RETRY= 5;
/**
* A buffer.
*/
private static byte[] buffer = new byte[8192];
/**
* Unzips the given zip file to the given destination directory
* extracting only those entries the pass through the given
* filter.
*
* @param zipFile the zip file to unzip
* @param dstDir the destination directory
* @throws IOException in case of problem
*/
public static void unzip(ZipFile zipFile, File dstDir) throws IOException {
Enumeration<? extends ZipEntry> entries = zipFile.entries();
try {
while(entries.hasMoreElements()){
ZipEntry entry = entries.nextElement();
if(entry.isDirectory()){
continue;
}
String entryName = entry.getName();
File file = new File(dstDir, changeSeparator(entryName, '/', File.separatorChar));
file.getParentFile().mkdirs();
try (
InputStream src = zipFile.getInputStream(entry);
OutputStream dst = new FileOutputStream(file);
) {
transferData(src, dst);
}
}
} finally {
try {
zipFile.close();
} catch(IOException e){
}
}
}
/**
* Returns the given file path with its separator
* character changed from the given old separator to the
* given new separator.
*
* @param path a file path
* @param oldSeparator a path separator character
* @param newSeparator a path separator character
* @return the file path with its separator character
* changed from the given old separator to the given new
* separator
*/
public static String changeSeparator(String path, char oldSeparator, char newSeparator){
return path.replace(oldSeparator, newSeparator);
}
/**
* Copies all bytes in the given source file to
* the given destination file.
*
* @param source the given source file
* @param destination the given destination file
* @throws IOException in case of error
*/
public static void transferData(File source, File destination) throws IOException {
destination.getParentFile().mkdirs();
try (
InputStream is = new FileInputStream(source);
OutputStream os = new FileOutputStream(destination);
) {
transferData(is, os);
}
}
/**
* Copies all bytes in the given source stream to
* the given destination stream. Neither streams
* are closed.
*
* @param source the given source stream
* @param destination the given destination stream
* @throws IOException in case of error
*/
public static void transferData(InputStream source, OutputStream destination) throws IOException {
int bytesRead = 0;
while(bytesRead != -1){
bytesRead = source.read(buffer, 0, buffer.length);
if(bytesRead != -1){
destination.write(buffer, 0, bytesRead);
}
}
}
/**
* Copies the given source file to the given destination file.
*
* @param src the given source file
* @param dst the given destination file
* @throws IOException in case of error
*/
public static void copy(File src, File dst) throws IOException {
if(src.isDirectory()){
String[] srcChildren = src.list();
if (srcChildren == null) {
throw new IOException("Content from directory '" + src.getAbsolutePath() + "' can not be listed."); //$NON-NLS-1$ //$NON-NLS-2$
}
for(int i = 0; i < srcChildren.length; ++i){
File srcChild= new File(src, srcChildren[i]);
File dstChild= new File(dst, srcChildren[i]);
copy(srcChild, dstChild);
}
} else
transferData(src, dst);
}
public static File getFileInPlugin(Plugin plugin, IPath path) {
try {
URL installURL= plugin.getBundle().getEntry(path.toString());
URL localURL= FileLocator.toFileURL(installURL);
return new File(localURL.getFile());
} catch (IOException e) {
return null;
}
}
public static File createTempFileInPlugin(Plugin plugin, IPath path) {
IPath stateLocation= plugin.getStateLocation();
stateLocation= stateLocation.append(path);
return stateLocation.toFile();
}
public static StringBuffer read(String fileName) throws IOException {
return read(new FileReader(fileName));
}
public static StringBuffer read(Reader reader) throws IOException {
StringBuffer s= new StringBuffer();
try {
char[] charBuffer= new char[8196];
int chars= reader.read(charBuffer);
while (chars != -1) {
s.append(charBuffer, 0, chars);
chars= reader.read(charBuffer);
}
} finally {
try {
reader.close();
} catch (IOException e) {
}
}
return s;
}
public static void write(String fileName, StringBuffer content) throws IOException {
try (Writer writer= new FileWriter(fileName);) {
writer.write(content.toString());
}
}
public static void delete(File file) {
if (file.exists()) {
for (int i= 0; i < MAX_RETRY; i++) {
if (file.delete())
i= MAX_RETRY;
else {
try {
Thread.sleep(1000); // sleep a second
} catch (InterruptedException e) {
}
}
}
}
}
}
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