/*
* 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.jackrabbit.core.value;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.jcr.RepositoryException;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.Arrays;
/**
* Represents binary data which is backed by a byte[] (in memory).
*/
class BLOBInMemory extends BLOBFileValue {
/**
* Logger instance for this class
*/
private static Logger log = LoggerFactory.getLogger(BLOBInMemory.class);
/**
* the prefix of the string representation of this value
*/
private static final String PREFIX = "0x";
/**
* the data
*/
private byte[] data;
/**
* empty array
*/
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
/**
* empty instance
*/
private static final BLOBInMemory EMPTY = new BLOBInMemory(EMPTY_BYTE_ARRAY);
/**
* Creates a new instance from a
* <code>byte[]</code> array.
*
* @param data the byte array
*/
private BLOBInMemory(byte[] data) {
this.data = data;
}
/**
* Creates a new instance from a
* <code>byte[]</code> array.
*
* @param data the byte array
*/
static BLOBInMemory getInstance(byte[] data) {
if (data.length == 0) {
return EMPTY;
} else {
return new BLOBInMemory(data);
}
}
/**
* Checks if String can be converted to an instance of this class.
* @param s
* @return true if it can be converted
*/
static boolean isInstance(String s) {
return s.startsWith(PREFIX);
}
/**
* Convert a String to an instance of this class.
* @param s
* @return the instance
*/
static BLOBInMemory getInstance(String s) throws IllegalArgumentException {
assert s.startsWith(PREFIX);
s = s.substring(PREFIX.length());
int len = s.length();
if (len % 2 != 0) {
String msg = "unable to deserialize byte array " + s + " , length=" + s.length();
log.debug(msg);
throw new IllegalArgumentException(msg);
}
len /= 2;
byte[] data = new byte[len];
try {
for (int i = 0; i < len; i++) {
data[i] = (byte) ((Character.digit(s.charAt(2 * i), 16) << 4) | (Character.digit(s.charAt(2 * i + 1), 16)));
}
} catch (NumberFormatException e) {
String msg = "unable to deserialize byte array " + s;
log.debug(msg);
throw new IllegalArgumentException(msg);
}
return BLOBInMemory.getInstance(data);
}
void delete(boolean pruneEmptyParentDirs) {
// do nothing
// this object could still be referenced
// the data will be garbage collected
}
public void dispose() {
// do nothing
// this object could still be referenced
// the data will be garbage collected
}
BLOBFileValue copy() throws RepositoryException {
return this;
}
public long getSize() {
return data.length;
}
public InputStream getStream() {
return new ByteArrayInputStream(data);
}
public String toString() {
StringBuilder buff = new StringBuilder(PREFIX.length() + 2 * data.length);
buff.append(PREFIX);
for (int i = 0; i < data.length; i++) {
int c = data[i] & 0xff;
buff.append(Integer.toHexString(c >> 4));
buff.append(Integer.toHexString(c & 0xf));
}
return buff.toString();
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof BLOBInMemory) {
BLOBInMemory other = (BLOBInMemory) obj;
return Arrays.equals(data, other.data);
}
return false;
}
/**
* Returns zero to satisfy the Object equals/hashCode contract.
* This class is mutable and not meant to be used as a hash key.
*
* @return always zero
* @see Object#hashCode()
*/
public int hashCode() {
return 0;
}
}