hivesterix/src/main/java/edu/uci/ics/hivesterix/serde/lazy/objectinspector/LazyColumnarObjectInspector.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 edu.uci.ics.hivesterix.serde.lazy.objectinspector;

import java.io.Serializable;
import java.util.List;

import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StandardStructObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructField;

import edu.uci.ics.hivesterix.serde.lazy.LazyColumnar;

/**
 * ObjectInspector for LazyColumnar.
 * 
 * @see LazyColumnar
 */
public class LazyColumnarObjectInspector extends StandardStructObjectInspector
		implements Serializable {

	private static final long serialVersionUID = 1L;

	public LazyColumnarObjectInspector(List<String> structFieldNames,
			List<ObjectInspector> structFieldObjectInspectors) {
		super(structFieldNames, structFieldObjectInspectors);
	}

	public LazyColumnarObjectInspector(List<StructField> fields) {
		super(fields);
	}

	@Override
	public Object getStructFieldData(Object data, StructField fieldRef) {
		if (data == null) {
			return null;
		}
		LazyColumnar struct = (LazyColumnar) data;
		MyField f = (MyField) fieldRef;

		int fieldID = f.getFieldID();
		assert (fieldID >= 0 && fieldID < fields.size());

		Object column = struct.getField(fieldID);
		return column;
	}

	@Override
	public List<Object> getStructFieldsDataAsList(Object data) {
		if (data == null) {
			return null;
		}
		LazyColumnar struct = (LazyColumnar) data;
		return struct.getFieldsAsList();
	}

	public String toString() {
		String str = "";
		for (MyField f : fields) {
			str += f.getFieldName() + ":"
					+ f.getFieldObjectInspector().getTypeName() + "  ";
		}
		return str;
	}
}