93 lines
2.5 KiB
Java
93 lines
2.5 KiB
Java
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/* BasicMapEntry.java -- a class providing a plain-vanilla implementation of
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the Map.Entry interface; could be used anywhere in java.util
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Copyright (C) 1998, 2000 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.util;
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/**
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* A class which implements Map.Entry. It is shared by HashMap, TreeMap, and
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* Hashtable.
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*
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* @author Jon Zeppieri
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* @version $Revision: 1.5 $
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* @modified $Id: BasicMapEntry.java,v 1.5 2000/10/26 10:19:00 bryce Exp $
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*/
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class BasicMapEntry implements Map.Entry
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{
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Object key;
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Object value;
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BasicMapEntry(Object newKey, Object newValue)
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{
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key = newKey;
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value = newValue;
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}
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public final boolean equals(Object o)
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{
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if (!(o instanceof Map.Entry))
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return false;
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Map.Entry e = (Map.Entry) o;
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return (key == null ? e.getKey() == null : key.equals(e.getKey())
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&& value == null ? e.getValue() == null
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: value.equals(e.getValue()));
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}
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public final Object getKey()
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{
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return key;
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}
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public final Object getValue()
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{
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return value;
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}
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public final int hashCode()
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{
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int kc = (key == null ? 0 : key.hashCode());
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int vc = (value == null ? 0 : value.hashCode());
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return kc ^ vc;
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}
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/**
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* sets the value of this Map.Entry. Note that this is overriden by
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* Hashtable.Entry, which does not permit a null value.
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*/
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public Object setValue(Object newVal)
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{
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Object r = value;
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value = newVal;
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return r;
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}
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public final String toString()
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{
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return key + "=" + value;
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}
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}
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