/*
* 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.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.util.XML;
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 strings.
*
* This codec uses a GZIP compressed string format for objects.
*
* @author Kelly
*/
class CompressedStringCodec 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);
gzip.write(object.toString().getBytes());
gzip.close();
} catch (IOException cantHappen) {}
Element value = doc.createElement("resultValue");
value.appendChild(doc.createCDATASection(byteArray.toString()));
return value;
}
public Object decode(Node node) {
String encodedValue;
if (node.getFirstChild().getNodeType() == Node.CDATA_SECTION_NODE)
encodedValue = node.getFirstChild().getNodeValue();
else
encodedValue = XML.text(node);
String rc = null;
try {
ByteArrayInputStream byteArray = new ByteArrayInputStream(encodedValue.getBytes());
Base64DecodingInputStream base64 = new Base64DecodingInputStream(byteArray);
GZIPInputStream gzip = new GZIPInputStream(base64);
StringBuffer b = new StringBuffer();
int numRead;
byte[] buf = new byte[1024];
while ((numRead = gzip.read(buf)) != -1)
b.append(new String(buf, 0, numRead));
gzip.close();
rc = b.toString();
} catch (IOException cantHappen) {}
return rc;
}
public InputStream getInputStream(Object value) {
return new ByteArrayInputStream(((String) value).getBytes());
}
public long sizeOf(Object obj) {
return ((String) obj).getBytes().length;
}
}