From 55d57b7d9f075c275e4fe30d29577a5b914f05db Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Thu, 5 Nov 2009 23:58:22 +0000
Subject: Add support for compressed records.

---
 .../carbonado/raw/CompressedEncodingStrategy.java  | 97 ++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/main/java/com/amazon/carbonado/raw/CompressedEncodingStrategy.java

(limited to 'src/main/java/com/amazon/carbonado/raw/CompressedEncodingStrategy.java')

diff --git a/src/main/java/com/amazon/carbonado/raw/CompressedEncodingStrategy.java b/src/main/java/com/amazon/carbonado/raw/CompressedEncodingStrategy.java
new file mode 100644
index 0000000..08f5eeb
--- /dev/null
+++ b/src/main/java/com/amazon/carbonado/raw/CompressedEncodingStrategy.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2009 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.raw;
+
+import org.cojen.classfile.CodeAssembler;
+import org.cojen.classfile.Label;
+import org.cojen.classfile.LocalVariable;
+import org.cojen.classfile.Opcode;
+import org.cojen.classfile.TypeDesc;
+
+import com.amazon.carbonado.Storable;
+import com.amazon.carbonado.SupportException;
+
+import com.amazon.carbonado.info.StorableIndex;
+import com.amazon.carbonado.info.StorableProperty;
+
+/**
+ * Extension of GenericEncodingStrategy that allows for compression.
+ *
+ * @author Olga Kuznetsova
+ * @author Brian S O'Neill
+ */
+public class CompressedEncodingStrategy<S extends Storable> extends GenericEncodingStrategy<S> {
+    private final CompressionType mCompressionType;
+
+    public CompressedEncodingStrategy(Class<S> type,
+                                      StorableIndex<S> pkIndex,
+                                      CompressionType compressionType) {
+        super(type, pkIndex);
+        mCompressionType = compressionType;
+    }
+
+    @Override
+    protected void extraDataEncoding(CodeAssembler a,
+                                     LocalVariable dataVar, int prefix, int suffix)
+    {
+        switch (mCompressionType) {
+        case GZIP:
+            TypeDesc byteArrayType = TypeDesc.forClass(byte[].class);
+            a.loadLocal(dataVar);
+            a.loadConstant(prefix);
+            a.invokeStatic(GzipCompressor.class.getName(), "compress", byteArrayType,
+                           new TypeDesc[] {byteArrayType, TypeDesc.INT});
+            a.storeLocal(dataVar);
+            break;
+        }
+    }
+
+    @Override
+    protected void extraDataDecoding(CodeAssembler a,
+                                     LocalVariable dataVar, int prefix, int suffix)
+    {
+        switch (mCompressionType) {
+        case GZIP:
+            TypeDesc byteArrayType = TypeDesc.forClass(byte[].class);
+            a.loadLocal(dataVar);
+            a.loadConstant(prefix);
+            a.invokeStatic(GzipCompressor.class.getName(), "decompress", byteArrayType,
+                           new TypeDesc[] {byteArrayType, TypeDesc.INT});
+            a.storeLocal(dataVar);
+            break;
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof CompressedEncodingStrategy) {
+            CompressedEncodingStrategy other = (CompressedEncodingStrategy) obj;
+            return super.equals(obj) && mCompressionType.equals(other.mCompressionType);
+        }
+        return false;
+    }
+
+    @Override 
+    public int hashCode() {
+        return super.hashCode() + mCompressionType.hashCode();
+    }
+}
-- 
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