package net.onrc.onos.ofcontroller.util;

import java.math.BigInteger;

import net.onrc.onos.ofcontroller.util.serializers.FlowEntryIdDeserializer;
import net.onrc.onos.ofcontroller.util.serializers.FlowEntryIdSerializer;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.annotate.JsonDeserialize;
import org.codehaus.jackson.map.annotate.JsonSerialize;

/**
 * The class representing a Flow Entry ID.
 */
@JsonDeserialize(using=FlowEntryIdDeserializer.class)
@JsonSerialize(using=FlowEntryIdSerializer.class)
public class FlowEntryId {
    private long value;

    /**
     * Default constructor.
     */
    public FlowEntryId() {
	this.value = -1;
    }

    /**
     * Constructor from an integer value.
     *
     * @param value the value to use.
     */
    public FlowEntryId(long value) {
	this.value = value;
    }

    /**
     * Constructor from a string.
     *
     * @param value the value to use.
     */
    public FlowEntryId(String value) {
	//
	// Use the help of BigInteger to parse strings representing
	// large unsigned hex long values.
	//
	char c = 0;
	if (value.length() > 2)
	    c = value.charAt(1);
	if ((c == 'x') || (c == 'X'))
	    this.value = new BigInteger(value.substring(2), 16).longValue();
	else
	    this.value = Long.decode(value);
    }

    /**
     * Get the value of the Flow Entry ID.
     *
     * @return the value of the Flow Entry ID.
     */
    public long value() { return value; }

    /**
     * Set the value of the Flow Entry ID.
     *
     * @param value the value to set.
     */
    public void setValue(long value) {
	this.value = value;
    }

    /**
     * Test whether the Flow Entry ID is valid.
     *
     * @return true if the Flow Entry ID is valid, otherwise false.
     */
    @JsonIgnore
    public boolean isValid() {
	return (this.value() != -1);
    }

    /**
     * Returns true of the object is another Flow Entry ID with 
     * the same value; otherwise, returns false.
     * 
     * @param Object to compare
     */
    @Override
    public boolean equals(Object obj){
	if(obj.getClass() == this.getClass()) {
	    FlowEntryId entry = (FlowEntryId) obj;
	    return this.value() == entry.value();
	}
	return false;
    }
    
    /**
     * Return the hash code of the Flow Entry ID
     */
    @Override
    public int hashCode() {
	return Long.valueOf(value).hashCode();
    }

    /**
     * Convert the Flow Entry ID value to a hexadecimal string.
     *
     * @return the Flow Entry ID value to a hexadecimal string.
     */
    @Override
    public String toString() {
	return "0x" + Long.toHexString(this.value);
    }
}