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jeremybenn |
/* RefAddr.java -- Abstract superclass of addresses used in References
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.naming;
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import java.io.Serializable;
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/**
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* Abstract superclass of addresses used in References.
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* A <code>Reference</code> object contains a <code>Vector</code> of
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* <code>RefAddr</code>s which are used to reference/address the object.
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* This abstract superclass keeps track of the type of address, which will be
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* returned by <code>getType()</code>. And defines a abstract method
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* <code>getContent()</code> which must be implemented in concrete subclasses
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* such as <code>BinaryRefAddr</code> and <code>StringRefAddr</code>.
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*
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* @see Reference
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* @see BinaryRefAddr
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* @see StringRefAddr
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* @since 1.3
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* @author Anthony Green (green@redhat.com)
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* @author Mark Wielaard (mark@klomp.org)
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*/
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public abstract class RefAddr implements Serializable
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{
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/**
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* The string resprenstation of the type of address.
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* Set by the constructor and returned by the getType() method.
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*/
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protected String addrType;
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/**
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* Protected constructor for use by subclasses.
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* Sets the addrType field of this object to the supplied String.
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*
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* @exception NullPointerException if the supplied String is null.
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*/
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protected RefAddr(String addrType)
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{
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if (addrType == null)
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throw new NullPointerException("addrType cannot be null");
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this.addrType = addrType;
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}
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/**
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* Returns the non-null address type given to the constructor.
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*/
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public String getType()
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{
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return addrType;
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}
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/**
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* Returns the possibly null content of this RefAddr.
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* The actual value is defined by the non-abstract subclass.
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*/
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public abstract Object getContent();
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/**
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* Checks if the object is a RefAddr with the same type and content.
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*
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* @return true if the given object is an instance of RefAddr, the addrType
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* is the same as this addrType and the content is equals to the
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* content of this object.
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*/
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public boolean equals(Object o)
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{
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if (o instanceof RefAddr)
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{
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RefAddr refAddr = (RefAddr) o;
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if (this.getType().equals(refAddr.getType()))
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{
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Object c1 = this.getContent();
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Object c2 = refAddr.getContent();
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if (c1 == null)
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return c2 == null;
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else
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return c1.equals(c2);
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}
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}
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return false;
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}
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/**
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* Returns the hashCode which is the hasCode of the String returned by
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* <code>getType()</code> plus the hashCode of the Object returned by
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* <code>getContent</code> (when not null).
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*/
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public int hashCode()
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{
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int result = getType().hashCode();
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Object o = getContent();
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if (o != null)
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result += o.hashCode();
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return result;
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}
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/**
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* Returns a String representation of the RefAddr.
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* Should only be used for debugging purposes.
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*/
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public String toString()
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{
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return "[RefAddr type: " + getType() + " content: " + getContent() + ']';
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}
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}
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