/*
 * 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.flink.runtime.io.network.api.serialization.types;

import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;

public class ByteSubArrayType implements SerializationTestType {

	private static final int MAX_LEN = 512;

	private final byte[] data;

	private int len;

	public ByteSubArrayType() {
		this.data = new byte[MAX_LEN];
		this.len = 0;
	}

	@Override
	public ByteSubArrayType getRandom(Random rnd) {
		final int len = rnd.nextInt(MAX_LEN) + 1;
		final ByteSubArrayType t = new ByteSubArrayType();
		t.len = len;

		final byte[] data = t.data;
		for (int i = 0; i < len; i++) {
			data[i] = (byte) rnd.nextInt(256);
		}

		return t;
	}

	@Override
	public int length() {
		return len + 4;
	}

	@Override
	public void write(DataOutputView out) throws IOException {
		out.writeInt(this.len);
		out.write(this.data, 0, this.len);
	}

	@Override
	public void read(DataInputView in) throws IOException {
		this.len = in.readInt();
		in.readFully(this.data, 0, this.len);
	}

	@Override
	public int hashCode() {
		final byte[] copy = new byte[this.len];
		System.arraycopy(this.data, 0, copy, 0, this.len);
		return Arrays.hashCode(copy);
	}

	@Override
	public boolean equals(Object obj) {
		if (obj instanceof ByteSubArrayType) {
			ByteSubArrayType other = (ByteSubArrayType) obj;
			if (this.len == other.len) {
				for (int i = 0; i < this.len; i++) {
					if (this.data[i] != other.data[i]) {
						return false;
					}
				}
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}
}