internalbindingkey.java

java1.6众多例子参考

/*
 * @(#)InternalBindingKey.java	1.24 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package com.sun.corba.se.impl.naming.cosnaming;

import org.omg.CosNaming.NameComponent;

/**
 * Class InternalBindingKey implements the necessary wrapper code
 * around the org.omg.CosNaming::NameComponent class to implement the proper
 * equals() method and the hashCode() method for use in a hash table.
 * It computes the hashCode once and stores it, and also precomputes
 * the lengths of the id and kind strings for faster comparison.
 */
public class InternalBindingKey
{
    // A key contains a name
    public NameComponent name;
    private int idLen;
    private int kindLen;
    private int hashVal;

    // Default Constructor
    public InternalBindingKey() {}

    // Normal constructor
    public InternalBindingKey(NameComponent n)
    {
        idLen = 0;
        kindLen = 0;
	setup(n);
    }

    // Setup the object
    protected void setup(NameComponent n) {
	this.name = n;
	// Precompute lengths and values since they will not change
        if( this.name.id != null ) {
	    idLen = this.name.id.length();
        }
        if( this.name.kind != null ) {
	    kindLen = this.name.kind.length();
        }
	hashVal = 0;
	if (idLen > 0)
	    hashVal += this.name.id.hashCode();
	if (kindLen > 0)
	    hashVal += this.name.kind.hashCode();
    }

    // Compare the keys by comparing name's id and kind
    public boolean equals(java.lang.Object o) {
	if (o == null)
	    return false;
	if (o instanceof InternalBindingKey) {
	    InternalBindingKey that = (InternalBindingKey)o;
	    // Both lengths must match
	    if (this.idLen != that.idLen || this.kindLen != that.kindLen) {
		return false;
	    }
	    // If id is set is must be equal
	    if (this.idLen > 0 && this.name.id.equals(that.name.id) == false) {
		return false;
	    }
	    // If kind is set it must be equal
	    if (this.kindLen > 0 && this.name.kind.equals(that.name.kind) == false) {
		return false;
	    }
	    // Must be the same
	    return true;
	} else {
	    return false;
	}
    }
    // Return precomputed value
    public int hashCode() {
	return this.hashVal;
    }
}