Java example source code file (BinaryRefAddr.java)

This example Java source code file (BinaryRefAddr.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

address, addresscontents, binaryrefaddr, object, refaddr, stringbuffer, type

The BinaryRefAddr.java Java example source code

/*
 * Copyright (c) 1999, 2013, 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 javax.naming;

/**
  * This class represents the binary form of the address of
  * a communications end-point.
  *<p>
  * A BinaryRefAddr consists of a type that describes the communication mechanism
  * and an opaque buffer containing the address description
  * specific to that communication mechanism. The format and interpretation of
  * the address type and the contents of the opaque buffer are based on
  * the agreement of three parties: the client that uses the address,
  * the object/server that can be reached using the address,
  * and the administrator or program that creates the address.
  *<p>
  * An example of a binary reference address is an BER X.500 presentation address.
  * Another example of a binary reference address is a serialized form of
  * a service's object handle.
  *<p>
  * A binary reference address is immutable in the sense that its fields
  * once created, cannot be replaced. However, it is possible to access
  * the byte array used to hold the opaque buffer. Programs are strongly
  * recommended against changing this byte array. Changes to this
  * byte array need to be explicitly synchronized.
  *
  * @author Rosanna Lee
  * @author Scott Seligman
  *
  * @see RefAddr
  * @see StringRefAddr
  * @since 1.3
  */

  /*
  * The serialized form of a BinaryRefAddr object consists of its type
  * name String and a byte array containing its "contents".
  */

public class BinaryRefAddr extends RefAddr {
    /**
     * Contains the bytes of the address.
     * This field is initialized by the constructor and returned
     * using getAddressBytes() and getAddressContents().
     * @serial
     */
    private byte[] buf = null;

    /**
      * Constructs a new instance of BinaryRefAddr using its address type and a byte
      * array for contents.
      *
      * @param addrType A non-null string describing the type of the address.
      * @param src      The non-null contents of the address as a byte array.
      *                 The contents of src is copied into the new BinaryRefAddr.
      */
    public BinaryRefAddr(String addrType, byte[] src) {
        this(addrType, src, 0, src.length);
    }

    /**
      * Constructs a new instance of BinaryRefAddr using its address type and
      * a region of a byte array for contents.
      *
      * @param addrType A non-null string describing the type of the address.
      * @param src      The non-null contents of the address as a byte array.
      *                 The contents of src is copied into the new BinaryRefAddr.
      * @param offset   The starting index in src to get the bytes.
      *                 {@code 0 <= offset <= src.length}.
      * @param count    The number of bytes to extract from src.
      *                 {@code 0 <= count <= src.length-offset}.
      */
    public BinaryRefAddr(String addrType, byte[] src, int offset, int count) {
        super(addrType);
        buf = new byte[count];
        System.arraycopy(src, offset, buf, 0, count);
    }

    /**
      * Retrieves the contents of this address as an Object.
      * The result is a byte array.
      * Changes to this array will affect this BinaryRefAddr's contents.
      * Programs are recommended against changing this array's contents
      * and to lock the buffer if they need to change it.
      *
      * @return The non-null buffer containing this address's contents.
      */
    public Object getContent() {
        return buf;
    }


    /**
      * Determines whether obj is equal to this address.  It is equal if
      * it contains the same address type and their contents are byte-wise
      * equivalent.
      * @param obj      The possibly null object to check.
      * @return true if the object is equal; false otherwise.
      */
    public boolean equals(Object obj) {
        if ((obj != null) && (obj instanceof BinaryRefAddr)) {
            BinaryRefAddr target = (BinaryRefAddr)obj;
            if (addrType.compareTo(target.addrType) == 0) {
                if (buf == null && target.buf == null)
                    return true;
                if (buf == null || target.buf == null ||
                    buf.length != target.buf.length)
                    return false;
                for (int i = 0; i < buf.length; i++)
                    if (buf[i] != target.buf[i])
                        return false;
                return true;
            }
        }
        return false;
    }

    /**
      * Computes the hash code of this address using its address type and contents.
      * Two BinaryRefAddrs have the same hash code if they have
      * the same address type and the same contents.
      * It is also possible for different BinaryRefAddrs to have
      * the same hash code.
      *
      * @return The hash code of this address as an int.
      */
    public int hashCode() {
        int hash = addrType.hashCode();
        for (int i = 0; i < buf.length; i++) {
            hash += buf[i];     // %%% improve later
        }
        return hash;
    }

    /**
      * Generates the string representation of this address.
      * The string consists of the address's type and contents with labels.
      * The first 32 bytes of contents are displayed (in hexadecimal).
      * If there are more than 32 bytes, "..." is used to indicate more.
      * This string is meant to used for debugging purposes and not
      * meant to be interpreted programmatically.
      * @return The non-null string representation of this address.
      */
    public String toString(){
        StringBuffer str = new StringBuffer("Address Type: " + addrType + "\n");

        str.append("AddressContents: ");
        for (int i = 0; i<buf.length && i < 32; i++) {
            str.append(Integer.toHexString(buf[i]) +" ");
        }
        if (buf.length >= 32)
            str.append(" ...\n");
        return (str.toString());
    }

    /**
     * Use serialVersionUID from JNDI 1.1.1 for interoperability
     */
    private static final long serialVersionUID = -3415254970957330361L;
}