+++ /dev/null
-/* BasicMapEntry.java -- a class providing a plain-vanilla implementation of
- the Map.Entry interface; could be used anywhere in java.util
- Copyright (C) 1998, 2000, 2001 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.util;
-
-/**
- * A class which implements Map.Entry. It is shared by HashMap, TreeMap,
- * Hashtable, and Collections. It is not specified by the JDK, but makes
- * life much easier.
- *
- * @author Jon Zeppieri
- * @author Eric Blake <ebb9@email.byu.edu>
- */
-class BasicMapEntry implements Map.Entry
-{
- /**
- * The key. Package visible for direct manipulation.
- */
- Object key;
-
- /**
- * The value. Package visible for direct manipulation.
- */
- Object value;
-
- /**
- * Basic constructor initializes the fields.
- * @param newKey the key
- * @param newValue the value
- */
- BasicMapEntry(Object newKey, Object newValue)
- {
- key = newKey;
- value = newValue;
- }
-
- /**
- * Compares the specified object with this entry. Returns true only if
- * the object is a mapping of identical key and value. In other words,
- * this must be:
- * <pre>
- * (o instanceof Map.Entry) &&
- * (getKey() == null ? ((HashMap) o).getKey() == null
- * : getKey().equals(((HashMap) o).getKey())) &&
- * (getValue() == null ? ((HashMap) o).getValue() == null
- * : getValue().equals(((HashMap) o).getValue()))
- * </pre>
- *
- * @param o the object to compare
- * @return true if it is equal
- */
- public final boolean equals(Object o)
- {
- if (! (o instanceof Map.Entry))
- return false;
- // Optimize for our own entries.
- if (o instanceof BasicMapEntry)
- {
- BasicMapEntry e = (BasicMapEntry) o;
- return (AbstractCollection.equals(key, e.key)
- && AbstractCollection.equals(value, e.value));
- }
- Map.Entry e = (Map.Entry) o;
- return (AbstractCollection.equals(key, e.getKey())
- && AbstractCollection.equals(value, e.getValue()));
- }
-
- /**
- * Get the key corresponding to this entry.
- *
- * @return the key
- */
- public final Object getKey()
- {
- return key;
- }
-
- /**
- * Get the value corresponding to this entry. If you already called
- * Iterator.remove(), the behavior undefined, but in this case it works.
- *
- * @return the value
- */
- public final Object getValue()
- {
- return value;
- }
-
- /**
- * Returns the hash code of the entry. This is defined as the exclusive-or
- * of the hashcodes of the key and value (using 0 for null). In other
- * words, this must be:
- * <pre>
- * (getKey() == null ? 0 : getKey().hashCode()) ^
- * (getValue() == null ? 0 : getValue().hashCode())
- * </pre>
- *
- * @return the hash code
- */
- public final int hashCode()
- {
- return (AbstractCollection.hashCode(key)
- ^ AbstractCollection.hashCode(value));
- }
-
- /**
- * Replaces the value with the specified object. This writes through
- * to the map, unless you have already called Iterator.remove(). It
- * may be overridden to restrict a null value.
- *
- * @param newVal the new value to store
- * @return the old value
- * @throws NullPointerException if the map forbids null values
- */
- public Object setValue(Object newVal)
- {
- Object r = value;
- value = newVal;
- return r;
- }
-
- /**
- * This provides a string representation of the entry. It is of the form
- * "key=value", where string concatenation is used on key and value.
- *
- * @return the string representation
- */
- public final String toString()
- {
- return key + "=" + value;
- }
-}
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