com.thinkberg.webdav.Util.java Source code

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Here is the source code for com.thinkberg.webdav.Util.java

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/*
 * Copyright 2007 Matthias L. Jugel.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.thinkberg.webdav;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * @author Matthias L. Jugel
 * @version $Id$
 */
public class Util {

    private static final SimpleDateFormat httpDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz",
            Locale.US);

    public static String getDateString(long time) {
        return httpDateFormat.format(new Date(time));
    }

    //  public static String getISODateString(long time) {
    //    return "";    4
    //  }

    public static long copyStream(final InputStream is, final OutputStream os) throws IOException {
        ReadableByteChannel rbc = Channels.newChannel(is);
        WritableByteChannel wbc = Channels.newChannel(os);

        int bytesWritten = 0;
        final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
        while (rbc.read(buffer) != -1) {
            buffer.flip();
            bytesWritten += wbc.write(buffer);
            buffer.compact();
        }
        buffer.flip();
        while (buffer.hasRemaining()) {
            bytesWritten += wbc.write(buffer);
        }

        rbc.close();
        wbc.close();

        return bytesWritten;
    }

    public static String getETag(FileObject object) {
        String fileName = object.getName().getPath();
        String lastModified = "";
        try {
            lastModified = String.valueOf(object.getContent().getLastModifiedTime());
        } catch (FileSystemException e) {
            // ignore error here
        }

        return DigestUtils.shaHex(fileName + lastModified);
    }
}