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/*
* Copyright 2007-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed 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 com.amazon.carbonado.adapter;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.nio.ByteBuffer;
/**
* Allows arrays of primitive types to be encoded (big-endian) as byte arrays.
*
* @author Brian S O'Neill
* @since 1.2
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@AdapterDefinition(storageTypePreferences=byte[].class)
public @interface PrimitiveArrayAdapter {
/**
* Adapter implementation for {@link PrimitiveArrayAdapter}.
*/
public static class Adapter {
/**
* @param type type of object that contains the adapted property
* @param propertyName name of property with adapter
* @param ann specific annotation that binds to this adapter class
*/
public Adapter(Class<?> type, String propertyName, PrimitiveArrayAdapter ann) {
}
public Adapter() {
}
public byte[] adaptToByteArray(short[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 1];
ByteBuffer.wrap(dst).asShortBuffer().put(src);
return dst;
}
public byte[] adaptToByteArray(char[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 1];
ByteBuffer.wrap(dst).asCharBuffer().put(src);
return dst;
}
public byte[] adaptToByteArray(int[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 2];
ByteBuffer.wrap(dst).asIntBuffer().put(src);
return dst;
}
public byte[] adaptToByteArray(long[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 3];
ByteBuffer.wrap(dst).asLongBuffer().put(src);
return dst;
}
public byte[] adaptToByteArray(float[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 2];
ByteBuffer.wrap(dst).asFloatBuffer().put(src);
return dst;
}
public byte[] adaptToByteArray(double[] src) {
if (src == null) {
return null;
}
byte[] dst = new byte[src.length << 3];
ByteBuffer.wrap(dst).asDoubleBuffer().put(src);
return dst;
}
/**
* Packs the given boolean array into a byte array, big-endian fashion.
*/
public byte[] adaptToByteArray(boolean[] src) {
if (src == null) {
return null;
}
int srcLength = src.length;
byte[] dst = new byte[(srcLength + 7) >> 3];
int dstOffset = 0;
int i = 0;
while (i + 8 <= srcLength) {
dst[dstOffset++] = (byte)
((src[i++] ? 0x80 : 0) |
(src[i++] ? 0x40 : 0) |
(src[i++] ? 0x20 : 0) |
(src[i++] ? 0x10 : 0) |
(src[i++] ? 0x08 : 0) |
(src[i++] ? 0x04 : 0) |
(src[i++] ? 0x02 : 0) |
(src[i++] ? 0x01 : 0));
}
if (i < srcLength) {
int accum = 0;
while (i < srcLength) {
accum = (accum << 1) | (src[i++] ? 1 : 0);
}
accum <<= 8 - (srcLength & 7);
dst[dstOffset] = (byte) accum;
}
return dst;
}
public short[] adaptToShortArray(byte[] src) {
if (src == null) {
return null;
}
short[] dst = new short[(src.length + 1) >> 1];
ByteBuffer.wrap(src).asShortBuffer().get(dst);
return dst;
}
public char[] adaptToCharArray(byte[] src) {
if (src == null) {
return null;
}
char[] dst = new char[(src.length + 1) >> 1];
ByteBuffer.wrap(src).asCharBuffer().get(dst);
return dst;
}
public int[] adaptToIntArray(byte[] src) {
if (src == null) {
return null;
}
int[] dst = new int[(src.length + 3) >> 2];
ByteBuffer.wrap(src).asIntBuffer().get(dst);
return dst;
}
public long[] adaptToLongArray(byte[] src) {
if (src == null) {
return null;
}
long[] dst = new long[(src.length + 7) >> 3];
ByteBuffer.wrap(src).asLongBuffer().get(dst);
return dst;
}
public float[] adaptToFloatArray(byte[] src) {
if (src == null) {
return null;
}
float[] dst = new float[(src.length + 3) >> 2];
ByteBuffer.wrap(src).asFloatBuffer().get(dst);
return dst;
}
public double[] adaptToDoubleArray(byte[] src) {
if (src == null) {
return null;
}
double[] dst = new double[(src.length + 7) >> 3];
ByteBuffer.wrap(src).asDoubleBuffer().get(dst);
return dst;
}
/**
* Unpacks a boolean array from a byte array, big-endian fashion.
*/
public boolean[] adaptToBooleanArray(byte[] src) {
if (src == null) {
return null;
}
int srcLength = src.length;
boolean[] dst = new boolean[srcLength << 3];
int dstOffset = 0;
for (int i=0; i<srcLength; i++) {
byte b = src[i];
dst[dstOffset++] = (b & 0x80) != 0;
dst[dstOffset++] = (b & 0x40) != 0;
dst[dstOffset++] = (b & 0x20) != 0;
dst[dstOffset++] = (b & 0x10) != 0;
dst[dstOffset++] = (b & 0x08) != 0;
dst[dstOffset++] = (b & 0x04) != 0;
dst[dstOffset++] = (b & 0x02) != 0;
dst[dstOffset++] = (b & 0x01) != 0;
}
return dst;
}
}
}
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