/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.waveprotocol.box.server.persistence;
import org.waveprotocol.box.server.persistence.AttachmentStore.AttachmentData;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.waveprotocol.wave.model.id.IdConstants;
import org.waveprotocol.wave.model.id.WaveId;
import org.waveprotocol.wave.model.id.WaveletId;
import org.waveprotocol.wave.model.id.WaveletName;
import org.waveprotocol.wave.model.waveref.InvalidWaveRefException;
import org.waveprotocol.wave.model.waveref.WaveRef;
import org.waveprotocol.wave.util.escapers.jvm.JavaWaverefEncoder;
import org.waveprotocol.wave.util.logging.Log;
/**
* Some utility methods for managing attachment data objects
*
* @author josephg@gmail.com (Joseph Gentle)
*/
public class AttachmentUtil {
private static final Log LOG = Log.get(AttachmentUtil.class);
private AttachmentUtil() {}
/**
* Write an input stream to an output stream. This will often be useful for
* implementors of AttachmentData.writeDataTo().
*
* @param source The InputStream to read from
* @param dest The OutputStream to write to
* @throws IOException
*/
public static void writeTo(InputStream source, OutputStream dest) throws IOException {
byte[] buffer = new byte[256];
int length;
while ((length = source.read(buffer)) != -1) {
dest.write(buffer, 0, length);
}
}
/**
* Write the attachment out to a string.
*
* @param encoding The string encoding format of the data. Eg, "UTF-8".
* @return A string representation of the attachment data.
* @throws IOException
*/
public static String writeAttachmentDataToString(
AttachmentData data, String encoding) throws IOException {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
writeTo(data.getInputStream(), stream);
return stream.toString(encoding);
}
/**
* Decode wavelet name.
*
* @param waveRefStr encoded name.
* @return WaveletName object.
*/
public static WaveletName waveRef2WaveletName(String waveRefStr) {
WaveRef waveRef = null;
try {
waveRef = JavaWaverefEncoder.decodeWaveRefFromPath(waveRefStr);
} catch (InvalidWaveRefException e) {
LOG.warning("Cannot decode: " + waveRefStr, e);
return null;
}
WaveId waveId = waveRef.getWaveId();
WaveletId waveletId =
waveRef.getWaveletId() != null ? waveRef.getWaveletId() : WaveletId.of(waveId.getDomain(),
IdConstants.CONVERSATION_ROOT_WAVELET);
WaveletName waveletName = WaveletName.of(waveId, waveletId);
return waveletName;
}
}