diff options
Diffstat (limited to 'src/main/java/com/amazon/carbonado/adapter')
| -rw-r--r-- | src/main/java/com/amazon/carbonado/adapter/PrimitiveArrayAdapter.java | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/main/java/com/amazon/carbonado/adapter/PrimitiveArrayAdapter.java b/src/main/java/com/amazon/carbonado/adapter/PrimitiveArrayAdapter.java new file mode 100644 index 0000000..f7b95a4 --- /dev/null +++ b/src/main/java/com/amazon/carbonado/adapter/PrimitiveArrayAdapter.java @@ -0,0 +1,227 @@ +/*
+ * Copyright 2007 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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