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/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.messaging.impl;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.coos.util.serialize.AFClassLoader;
import org.coos.util.serialize.AFSerializer;

import org.coos.messaging.Op;

public class AttributeConstraint implements AFSerializer {

	/** the comparison value */
	public AttributeValue value;

	/**
	 * the comparison operator
	 * 
	 * valid values are defined in {@link Op}
	 **/
	public short op;

	public AttributeConstraint() {
		super();
	}

	/** creates a (deep) copy of an attribute constraint */
	public AttributeConstraint(AttributeConstraint c) {
		value = new AttributeValue(c.value);
		op = c.op;
	}

	/** create an equality constraint with the given value */
	public AttributeConstraint(AttributeValue v) {
		value = v;
		op = Op.EQ;
	}

	/** create a constraint with the given string value */
	public AttributeConstraint(short o, String s) {
		value = new AttributeValue(s);
		op = o;
	}

	/** create a constraint with the given byte[] value */
	public AttributeConstraint(short o, byte[] s) {
		value = new AttributeValue(s);
		op = o;
	}

	/** create a constraint with the given int value */
	public AttributeConstraint(short o, int i) {
		value = new AttributeValue(i);
		op = o;
	}

	/** create a constraint with the given long value */
	public AttributeConstraint(short o, long i) {
		value = new AttributeValue(i);
		op = o;
	}

	/** create a constraint with the given long value */
	public AttributeConstraint(short o, double d) {
		value = new AttributeValue(d);
		op = o;
	}

	/** create a constraint with the given boolean value */
	public AttributeConstraint(short o, boolean b) {
		value = new AttributeValue(b);
		op = o;
	}

	/** create a constraint with the given value */
	public AttributeConstraint(short o, AttributeValue x) {
		value = new AttributeValue(x);
		op = o;
	}

	public boolean isEqualTo(AttributeConstraint x) {
		//
		// this is a conservative implementation.
		// 
		return op == x.op && (op == Op.ANY || value.isEqualTo(x.value));
	}

	public String toString() {
		/*
		 * SENPBuffer b = new SENPBuffer(); b.encode(this); return new
		 * String(b.buf, 0, b.length());
		 */
		return null;
	}

	public int hashCode() {
		return toString().hashCode();
	}

	public ByteArrayInputStream deSerialize(byte[] data, AFClassLoader cl) throws IOException {
		ByteArrayInputStream bin = new ByteArrayInputStream(data);
		DataInputStream din = new DataInputStream(bin);
		op = din.readShort();
		int len = din.readInt();
		byte[] tmp = new byte[len];
		din.readFully(tmp);
		try {
			value = (AttributeValue) AttributeValue.class.newInstance();
			value.deSerialize(tmp, cl);

		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return bin;
	}

	public byte[] serialize() throws IOException {
		ByteArrayOutputStream bout = new ByteArrayOutputStream();
		DataOutputStream dout = new DataOutputStream(bout);
		dout.writeShort(op);
		byte[] serializedAttribute = value.serialize();
		dout.writeInt(serializedAttribute.length);
		if (serializedAttribute.length > 0) {
			dout.write(serializedAttribute);
		}
		dout.flush();
		return bout.toByteArray();
	}

}




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