/*
 * 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.api.java.typeutils.runtime;

import org.apache.flink.configuration.ConfigConstants;
import org.apache.hadoop.io.Writable;

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

public class StringArrayWritable implements Writable, Comparable<StringArrayWritable> {
	
	private String[] array = new String[0];
	
	public StringArrayWritable() {
		super();
	}
	
	public StringArrayWritable(String[] array) {
		this.array = array;
	}
	
	@Override
	public void write(DataOutput out) throws IOException {
		out.writeInt(this.array.length);
		
		for(String str : this.array) {
			byte[] b = str.getBytes(ConfigConstants.DEFAULT_CHARSET);
			out.writeInt(b.length);
			out.write(b);
		}
	}
	
	@Override
	public void readFields(DataInput in) throws IOException {
		this.array = new String[in.readInt()];
		
		for(int i = 0; i < this.array.length; i++) {
			byte[] b = new byte[in.readInt()];
			in.readFully(b);
			this.array[i] = new String(b, ConfigConstants.DEFAULT_CHARSET);
		}
	}
	
	@Override
	public int compareTo(StringArrayWritable o) {
		if(this.array.length != o.array.length) {
			return this.array.length - o.array.length;
		}
		
		for(int i = 0; i < this.array.length; i++) {
			int comp = this.array[i].compareTo(o.array[i]);
			if(comp != 0) {
				return comp;
			}
		}
		return 0;
	}
	
	@Override
	public boolean equals(Object obj) {
		if(!(obj instanceof StringArrayWritable)) {
			return false;
		}
		return this.compareTo((StringArrayWritable) obj) == 0;
	}
}