hivesterix/src/main/java/edu/uci/ics/hivesterix/serde/lazy/LazyString.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;

import org.apache.hadoop.io.Text;

import edu.uci.ics.hivesterix.serde.lazy.LazyUtils.VInt;
import edu.uci.ics.hivesterix.serde.lazy.objectinspector.primitive.LazyStringObjectInspector;

/**
 * LazyObject for storing a value of String.
 */
public class LazyString extends LazyPrimitive<LazyStringObjectInspector, Text> {

	public LazyString(LazyStringObjectInspector oi) {
		super(oi);
		data = new Text();
	}

	public LazyString(LazyString copy) {
		super(copy);
		data = new Text(copy.data);
	}

	VInt vInt = new LazyUtils.VInt();

	@Override
	public void init(byte[] bytes, int start, int length) {
		if (length == 0) {
			isNull = true;
			return;
		} else
			isNull = false;

		// get the byte length of the string
		LazyUtils.readVInt(bytes, start, vInt);
		if (vInt.value + vInt.length != length)
			throw new IllegalStateException(
					"parse string: length mismatch, expected "
							+ (vInt.value + vInt.length) + " but get " + length);
		assert (length - vInt.length > -1);
		data.set(bytes, start + vInt.length, length - vInt.length);
	}

}