/*
 * 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 org.apache.sysds.runtime.instructions.spark.data;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.Serializable;

import org.apache.sysds.runtime.matrix.data.MatrixBlock;
import org.apache.sysds.runtime.matrix.data.MatrixIndexes;
import org.apache.sysds.runtime.matrix.data.MatrixValue;
import org.apache.sysds.runtime.ooc.cache.io.SpillableObject;

public class IndexedMatrixValue implements SpillableObject, Serializable
{
	private static final long serialVersionUID = 6723389820806752110L;

	private MatrixIndexes _indexes = null;
	private MatrixValue   _value = null;

	public IndexedMatrixValue() {
		_indexes = new MatrixIndexes();
	}

	public IndexedMatrixValue(Class<? extends MatrixValue> cls) {
		this();

		//create new value object for given class
		try {
			_value=cls.getDeclaredConstructor().newInstance();
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public IndexedMatrixValue(MatrixIndexes ind, MatrixValue b) {
		this();
		_indexes.setIndexes(ind);
		_value = b;
	}

	public IndexedMatrixValue(IndexedMatrixValue that) {
		this(that._indexes, that._value);
	}


	public MatrixIndexes getIndexes() {
		return _indexes;
	}

	public MatrixValue getValue() {
		return _value;
	}

	public void setValue(MatrixValue value) {
		_value = value;
	}

	public void set(MatrixIndexes indexes2, MatrixValue block2) {
		_indexes.setIndexes(indexes2);
		_value = block2;
	}

	@Override
	public String toString() {
		return "("+_indexes.getRowIndex()+", "+_indexes.getColumnIndex()+"): \n"+_value;
	}

	@Override
	public boolean tryWrite(DataOutput dataOutput) throws IOException {
		MatrixIndexes ix = _indexes;
		MatrixValue value = _value;
		if(ix == null || value == null)
			return false;
		ix.write(dataOutput);
		value.write(dataOutput);
		return true;
	}

	@Override
	public void discard() {
		_value = null;
	}

	@Override
	public void read(DataInput dataInput) throws IOException {
		_indexes = new  MatrixIndexes();
		_value = new  MatrixBlock();
		_indexes.readFields(dataInput);
		_value.readFields(dataInput);
	}
}
