/*

 * 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 address of a communications end-point.

  * It consists of a type that describes the communication mechanism

  * and an address contents determined by an RefAddr subclass.

  *<p>

  * For example, an address type could be "BSD Printer Address",

  * which specifies that it is an address to be used with the BSD printing

  * protocol. Its contents could be the machine name identifying the

  * location of the printer server that understands this protocol.

  *<p>

  * A RefAddr is contained within a Reference.

  *<p>

  * RefAddr is an abstract class. Concrete implementations of it

  * determine its synchronization properties.

  *

  * @author Rosanna Lee

  * @author Scott Seligman

  *

  * @see Reference

  * @see LinkRef

  * @see StringRefAddr

  * @see BinaryRefAddr

  * @since 1.3

  */

  /*<p>

  * The serialized form of a RefAddr object consists of only its type name

  * String.

  */

public abstract class RefAddr implements java.io.Serializable {

    /**

     * Contains the type of this address.

     * @serial

     */

    protected String addrType;

    /**

      * Constructs a new instance of RefAddr using its address type.

      *

      * @param addrType A non-null string describing the type of the address.

      */

    protected RefAddr(String addrType) {

        this.addrType = addrType;

    }

    /**

      * Retrieves the address type of this address.

      *

      * @return The non-null address type of this address.

      */

    public String getType() {

        return addrType;

    }

    /**

      * Retrieves the contents of this address.

      *

      * @return The possibly null address contents.

      */

    public abstract Object getContent();

    /**

      * Determines whether obj is equal to this RefAddr.

      *<p>

      *<ul>

      *<li> non-null

      *<li> instance of RefAddr

      *<li> obj has the same address type as this RefAddr (using String.compareTo())

      *<li> both obj and this RefAddr's contents are null or they are equal

      *         (using the equals() test).

      *</ul>

      * @param obj possibly null obj to check.

      * @return true if obj is equal to this refaddr; false otherwise.

      * @see #getContent

      * @see #getType

      */

    public boolean equals(Object obj) {

        if ((obj != null) && (obj instanceof RefAddr)) {

            RefAddr target = (RefAddr)obj;

            if (addrType.compareTo(target.addrType) == 0) {

                Object thisobj = this.getContent();

                Object thatobj = target.getContent();

                if (thisobj == thatobj)

                    return true;

                if (thisobj != null)

                    return thisobj.equals(thatobj);

            }

        }

        return false;

    }

    /**

      * Computes the hash code of this address using its address type and contents.

      * The hash code is the sum of the hash code of the address type and

      * the hash code of the address contents.

      *

      * @return The hash code of this address as an int.

      * @see java.lang.Object#hashCode

      */

    public int hashCode() {

        return (getContent() == null)

                ? addrType.hashCode()

                : addrType.hashCode() + getContent().hashCode();

    }

    /**

      * Generates the string representation of this address.

      * The string consists of the address's type and contents with labels.

      * This representation is intended for display only and not to be parsed.

      * @return The non-null string representation of this address.

      */

    public String toString(){

        StringBuffer str = new StringBuffer("Type: " + addrType + "\n");

        str.append("Content: " + getContent() + "\n");

        return (str.toString());

    }

    /**

     * Use serialVersionUID from JNDI 1.1.1 for interoperability

     */

    private static final long serialVersionUID = -1468165120479154358L;

}