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/**
Copyright 2013 project Ardulink http://www.ardulink.org/
 
Licensed 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.ardulink.util;

import static org.ardulink.util.Preconditions.checkArgument;
import static org.ardulink.util.Preconditions.checkNotNull;
import static org.ardulink.util.Preconditions.checkState;

import java.util.Arrays;

/**
 * [ardulinktitle] [ardulinkversion]
 * 
 * project Ardulink http://www.ardulink.org/
 * 
 * [adsense]
 *
 * This class is not threadsafe.
 * 
 * @author Peter Fichtner
 */
public class ByteArray {

	private static final int MAX_BUFFER_LEN = 2048;

	private final byte[] data;

	private int endPointer;

	public ByteArray() {
		this(MAX_BUFFER_LEN);
	}

	public ByteArray(int maxLength) {
		data = new byte[maxLength];
	}

	public boolean contains(byte[] delimiter) {
		return indexOf(delimiter) >= 0;
	}

	public boolean contentIs(byte[] bytes) {
		return Bytes.equals(data, bytes, endPointer);
	}

	private int indexOf(byte[] delimiter) {
		checkState(checkNotNull(delimiter, "delimiter must not be null").length > 0, "delimiter must not be empty");
		return Bytes.indexOf(data, delimiter, 0, endPointer);
	}

	/**
	 * Appends the passed byte to the internal byte[].
	 * 
	 * @param b the data to append
	 */
	public void append(byte b) {
		checkArgument(this.endPointer + 1 <= this.data.length, "buffer overrun");
		this.data[this.endPointer++] = b;
	}

	/**
	 * Appends the passed bytes to the internal byte[].
	 * 
	 * @param bytes the data to append
	 */
	public void append(byte[] bytes) {
		append(bytes, bytes.length);
	}

	/**
	 * Appends the passed bytes to the internal byte[].
	 * 
	 * @param bytes     the data to append
	 * @param bytesRead length of the data to append from buffer
	 */
	public void append(byte[] bytes, int bytesRead) {
		checkArgument(this.endPointer + bytesRead <= this.data.length, "buffer overrun");
		System.arraycopy(bytes, 0, this.data, this.endPointer, bytesRead);
		this.endPointer += bytesRead;
	}

	public int length() {
		return endPointer;
	}

	public byte[] copy() {
		return Arrays.copyOf(data, endPointer);
	}

	public void clear() {
		endPointer = 0;
	}

}