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Java example source code file (InternalBindingKey.java)

This example Java source code file (InternalBindingKey.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

internalbindingkey, namecomponent

The InternalBindingKey.java Java example source code

/*
 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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;
    }
}

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