src/java/org/apache/pluto/driver/util/ObjectIdImpl.java

/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * 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.apache.pluto.driver.util;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
 * * Wraps around the internal Object IDs. By holding both * the string and the
 * integer version of an Object ID this class * helps speed up the internal
 * processing.
 */

public class ObjectIdImpl implements org.apache.pluto.om.ObjectID,
                                     java.io.Serializable {

    private String stringOID = null;
    private int intOID;

    private ObjectIdImpl(int oid) {
        stringOID = String.valueOf(oid);
        intOID = oid;
    }


    private ObjectIdImpl(int oid, String stringOID) {
        this.stringOID = stringOID;
        intOID = oid;
    }   

    // internal methods.
    
    private void readObject(ObjectInputStream stream) throws IOException,
                                                             ClassNotFoundException {
        intOID = stream.readInt();

        stringOID = String.valueOf(intOID);
    }

    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.write(intOID);
    }

    
    // addtional methods.
    
    public boolean equals(Object object) {
        boolean result = false;

        if (object instanceof ObjectIdImpl) {
            result = (intOID == ((ObjectIdImpl) object).intOID);
        } else if (object instanceof String) {
            result = stringOID.equals(object);
        } else if (object instanceof Integer) {
            result = (intOID == ((Integer) object).intValue());
        }
        return (result);
    }

    public int hashCode() {
        return (intOID);
    }

    public String toString() {
        return (stringOID);
    }

    public int intValue() {
        return (intOID);
    }

    static public ObjectIdImpl createFromString(String idStr) {
        char[] id = idStr.toCharArray();
        int _id = 1;
        for (int i = 0; i < id.length; i++) {
            if ((i % 2) == 0) {
                _id *= id[i];
            } else {
                _id ^= id[i];
            }
            _id = Math.abs(_id);
        }
        return new ObjectIdImpl(_id, idStr);
    }
}