Implement a basic result reader utility to read the result buffer and serializing it to JSON.
git-svn-id: https://asterixdb.googlecode.com/svn/branches/asterix_stabilization_result_distribution@1151 eaa15691-b419-025a-1212-ee371bd00084
diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/result/ReaderUtils.java b/asterix-app/src/main/java/edu/uci/ics/asterix/result/ReaderUtils.java
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+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/result/ReaderUtils.java
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+/*
+ * Copyright 2009-2010 by The Regents of the University of California
+ * 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 from
+ *
+ * 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 edu.uci.ics.asterix.result;
+
+import java.io.DataInputStream;
+import java.nio.ByteBuffer;
+
+import org.json.JSONException;
+
+import twitter4j.internal.org.json.JSONArray;
+
+import edu.uci.ics.asterix.om.base.IAObject;
+import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
+import edu.uci.ics.hyracks.dataflow.common.comm.util.ByteBufferInputStream;
+
+public class ReaderUtils {
+ public static JSONArray getJSONFromBuffer(ByteBuffer buffer, FrameTupleAccessor fta,
+ RecordDescriptor recordDescriptor) throws HyracksDataException {
+ JSONArray resultRecords = new JSONArray();
+ ByteBufferInputStream bbis = new ByteBufferInputStream();
+ DataInputStream di = new DataInputStream(bbis);
+
+ try {
+ fta.reset(buffer);
+ for (int tIndex = 0; tIndex < fta.getTupleCount(); tIndex++) {
+ int start = fta.getTupleStartOffset(tIndex) + fta.getFieldSlotsLength();
+ bbis.setByteBuffer(buffer, start);
+ Object[] record = new Object[recordDescriptor.getFieldCount()];
+ JSONArray resultRecord = new JSONArray();
+ for (int i = 0; i < record.length; ++i) {
+ IAObject instance = (IAObject) recordDescriptor.getFields()[i].deserialize(di);
+ resultRecord.put(instance.toJSON());
+ }
+ resultRecords.put(resultRecord);
+ }
+ } catch (JSONException e) {
+ throw new HyracksDataException(e);
+ }
+ return resultRecords;
+ }
+}