/*
* 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.apache.oodt.xmlquery;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OptionalDataException;
import java.io.StreamCorruptedException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import org.apache.oodt.commons.io.Base64DecodingInputStream;
import org.apache.oodt.commons.io.Base64EncodingOutputStream;
import org.apache.oodt.commons.io.NullOutputStream;
import org.apache.oodt.commons.util.XML;
import org.apache.oodt.commons.io.CountingOutputStream;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/** A result encoder/decoder for compressed, serialized objects.
*
* This codec uses a GZIP compressed serialized object format for objects.
*
* @author Kelly
*/
class CompressedObjectCodec implements Codec {
public Node encode(Object object, Document doc) throws DOMException {
ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
try {
Base64EncodingOutputStream base64 = new Base64EncodingOutputStream(byteArray);
GZIPOutputStream gzip = new GZIPOutputStream(base64);
ObjectOutputStream objStream = new ObjectOutputStream(gzip);
objStream.writeObject(object);
objStream.close();
} catch (IOException cantHappen) {}
Element value = doc.createElement("resultValue");
value.appendChild(doc.createCDATASection(byteArray.toString()));
return value;
}
public Object decode(Node node) throws ClassNotFoundException, InvalidClassException, StreamCorruptedException,
OptionalDataException {
String encodedValue;
if (node.getFirstChild().getNodeType() == Node.CDATA_SECTION_NODE)
encodedValue = node.getFirstChild().getNodeValue();
else
encodedValue = XML.text(node);
Object rc = null;
try {
ByteArrayInputStream byteArray = new ByteArrayInputStream(encodedValue.getBytes());
Base64DecodingInputStream base64 = new Base64DecodingInputStream(byteArray);
GZIPInputStream gzip = new GZIPInputStream(base64);
ObjectInputStream objStream = new ObjectInputStream(gzip);
rc = objStream.readObject();
objStream.close();
} catch (InvalidClassException ex) {
throw ex;
} catch (StreamCorruptedException ex) {
throw ex;
} catch (OptionalDataException ex) {
throw ex;
} catch (IOException cantHappen) {}
return rc;
}
public InputStream getInputStream(Object value) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(value);
oos.close();
baos.close();
return new ByteArrayInputStream(baos.toByteArray());
}
public long sizeOf(Object obj) {
try {
CountingOutputStream c = new CountingOutputStream(new NullOutputStream());
ObjectOutputStream stream = new ObjectOutputStream(c);
stream.writeObject(obj);
stream.close();
return c.getBytesWritten();
} catch (IOException ex) {
throw new IllegalStateException("I/O exception " + ex.getClass().getName() + " can't happen, yet did: "
+ ex.getMessage());
}
}
}