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AGSerializer.java
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AGSerializer.java
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/******************************************************************************
** Copyright (c) 2008-2011 Franz Inc.
** All rights reserved. This program and the accompanying materials
** are made available under the terms of the Eclipse Public License v1.0
** which accompanies this distribution, and is available at
** http://www.eclipse.org/legal/epl-v10.html
******************************************************************************/
package com.franz.agraph.http.storedproc;
import java.util.List;
/**
* Given a array of arrays and strings convert to a byte array.
*
* @since v4.2
* @deprecated The stored proc feature and API are experimental, and subject to change in a future release.
*/
public class AGSerializer {
private ByteArray barr;
/**
* @param data Strings, Integers, null, byte[], Object[], and {@link List} of these.
* @return byte-encoded and serialized to a string
*/
public static String serializeAndEncode(Object[] data) {
AGSerializer o = new AGSerializer();
o.serializex(data);
return AGEncoder.encode(o.finish());
}
public AGSerializer() {
// start the serialization process
barr = new ByteArray();
}
public byte[] finish() {
// when all objects are serialized, this returns the byte
// array with the serialized data
barr.addbyte(SerialConstants.SO_END_OF_ITEMS);
byte[] retv = barr.extract();
barr = null; // to be gc'ed
return retv;
}
public AGSerializer serializex(Object obj) {
if (obj instanceof String) {
String str = (String) obj;
barr.addbyte(SerialConstants.SO_STRING);
serializeInteger(str.length());
for (int i = 0; i < str.length(); i++) {
// deal with unicode cvt via utf-8 here
barr.addbyte((byte) (str.codePointAt(i) & 0xff));
}
} else if (obj instanceof Integer) {
int i = (Integer) obj;
if (i >= 0) {
barr.addbyte(SerialConstants.SO_POS_INTEGER);
serializeInteger(i);
} else {
barr.addbyte(SerialConstants.SO_NEG_INTEGER);
serializeInteger(-i);
}
} else if (obj instanceof Object[]) {
Object[] vec = (Object[]) obj;
barr.addbyte(SerialConstants.SO_VECTOR);
serializeInteger(vec.length);
for (int i = 0; i < vec.length; i++) {
serializex(vec[i]);
}
} else if (obj instanceof byte[]) {
byte[] vec = (byte[]) obj;
barr.addbyte(SerialConstants.SO_BYTEVECTOR);
serializeInteger(vec.length);
for (int i = 0; i < vec.length; i++) {
barr.addbyte(vec[i]);
}
} else if (obj instanceof List) {
List vec = (List) obj;
barr.addbyte(SerialConstants.SO_LIST);
serializeInteger(vec.size());
for (int i = 0; i < vec.size(); i++) {
serializex(vec.get(i));
}
// TODO: extra null needed by lisp side, bug in lisp?
barr.addbyte(SerialConstants.SO_NULL);
} else if (obj == null) {
barr.addbyte(SerialConstants.SO_NULL);
} else {
throw new RuntimeException("cannot serialize object " + obj);
}
return this;
}
void serializeInteger(int i) {
// i is non negative
while (true) {
byte lower = (byte) (i & 0x7f);
int rest = i >> 7;
if (rest != 0) {
lower |= 0x80;
}
barr.addbyte(lower);
if (rest == 0) {
break;
}
i = rest;
}
return;
}
}