2000-08-28 00:06:44 +02:00
|
|
|
/* HashMap.java -- a class providing a basic hashtable data structure,
|
|
|
|
mapping Object --> Object
|
2001-10-16 07:47:01 +02:00
|
|
|
Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
|
2000-08-28 00:06:44 +02:00
|
|
|
|
|
|
|
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.
|
2000-12-11 04:47:48 +01:00
|
|
|
|
2000-08-28 00:06:44 +02:00
|
|
|
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.
|
|
|
|
|
|
|
|
As a special exception, if you link this library with other files to
|
|
|
|
produce an executable, this library does not by itself cause the
|
|
|
|
resulting executable to be covered by the GNU General Public License.
|
|
|
|
This exception does not however invalidate any other reasons why the
|
|
|
|
executable file might be covered by the GNU General Public License. */
|
|
|
|
|
|
|
|
|
|
|
|
package java.util;
|
|
|
|
|
|
|
|
import java.io.IOException;
|
|
|
|
import java.io.Serializable;
|
|
|
|
import java.io.ObjectInputStream;
|
|
|
|
import java.io.ObjectOutputStream;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
|
|
|
// NOTE: This implementation is very similar to that of Hashtable. If you fix
|
|
|
|
// a bug in here, chances are you should make a similar change to the Hashtable
|
|
|
|
// code.
|
2000-08-28 00:06:44 +02:00
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
// NOTE: This implementation has some nasty coding style in order to
|
|
|
|
// support LinkedHashMap, which extends this.
|
|
|
|
|
2000-08-28 00:06:44 +02:00
|
|
|
/**
|
|
|
|
* This class provides a hashtable-backed implementation of the
|
2001-10-16 07:47:01 +02:00
|
|
|
* Map interface.
|
|
|
|
* <p>
|
2000-08-28 00:06:44 +02:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* It uses a hash-bucket approach; that is, hash collisions are handled
|
|
|
|
* by linking the new node off of the pre-existing node (or list of
|
|
|
|
* nodes). In this manner, techniques such as linear probing (which
|
|
|
|
* can cause primary clustering) and rehashing (which does not fit very
|
|
|
|
* well with Java's method of precomputing hash codes) are avoided.
|
|
|
|
* <p>
|
2000-08-28 00:06:44 +02:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* Under ideal circumstances (no collisions), HashMap offers O(1)
|
2000-08-28 00:06:44 +02:00
|
|
|
* performance on most operations (<pre>containsValue()</pre> is,
|
2001-10-16 07:47:01 +02:00
|
|
|
* of course, O(n)). In the worst case (all keys map to the same
|
2000-08-28 00:06:44 +02:00
|
|
|
* hash code -- very unlikely), most operations are O(n).
|
2001-10-16 07:47:01 +02:00
|
|
|
* <p>
|
2000-08-28 00:06:44 +02:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* HashMap is part of the JDK1.2 Collections API. It differs from
|
2000-08-28 00:06:44 +02:00
|
|
|
* Hashtable in that it accepts the null key and null values, and it
|
|
|
|
* does not support "Enumeration views."
|
2001-10-16 07:47:01 +02:00
|
|
|
* <p>
|
|
|
|
*
|
|
|
|
* The iterators are <i>fail-fast</i>, meaning that any structural
|
|
|
|
* modification, except for <code>remove()</code> called on the iterator
|
|
|
|
* itself, cause the iterator to throw a
|
|
|
|
* <code>ConcurrentModificationException</code> rather than exhibit
|
|
|
|
* non-deterministic behavior.
|
2000-08-28 00:06:44 +02:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @author Jon Zeppieri
|
|
|
|
* @author Jochen Hoenicke
|
|
|
|
* @author Bryce McKinlay
|
|
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
|
|
* @see Object#hashCode()
|
|
|
|
* @see Collection
|
|
|
|
* @see Map
|
|
|
|
* @see TreeMap
|
|
|
|
* @see LinkedHashMap
|
|
|
|
* @see IdentityHashMap
|
|
|
|
* @see Hashtable
|
|
|
|
* @since 1.2
|
2000-08-28 00:06:44 +02:00
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public class HashMap extends AbstractMap
|
|
|
|
implements Map, Cloneable, Serializable
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Default number of buckets. This is the value the JDK 1.3 uses. Some
|
|
|
|
* early documentation specified this value as 101. That is incorrect.
|
|
|
|
*/
|
|
|
|
static final int DEFAULT_CAPACITY = 11;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* The default load factor; this is explicitly specified by the spec.
|
|
|
|
*/
|
|
|
|
static final float DEFAULT_LOAD_FACTOR = 0.75f;
|
|
|
|
|
|
|
|
/** "enum" of iterator types. */
|
|
|
|
static final int KEYS = 0,
|
|
|
|
VALUES = 1,
|
|
|
|
ENTRIES = 2;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Compatible with JDK 1.2.
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
private static final long serialVersionUID = 362498820763181265L;
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* The rounded product of the capacity and the load factor; when the number
|
2000-12-11 04:47:48 +01:00
|
|
|
* of elements exceeds the threshold, the HashMap calls <pre>rehash()</pre>.
|
|
|
|
* @serial
|
|
|
|
*/
|
|
|
|
int threshold;
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Load factor of this HashMap: used in computing the threshold.
|
2000-12-11 04:47:48 +01:00
|
|
|
* @serial
|
|
|
|
*/
|
2001-10-16 07:47:01 +02:00
|
|
|
final float loadFactor;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Array containing the actual key-value mappings.
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
2001-10-16 07:47:01 +02:00
|
|
|
transient HashEntry[] buckets;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Counts the number of modifications this HashMap has undergone, used
|
2000-12-11 04:47:48 +01:00
|
|
|
* by Iterators to know when to throw ConcurrentModificationExceptions.
|
|
|
|
*/
|
|
|
|
transient int modCount;
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* The size of this HashMap: denotes the number of key-value pairs.
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
transient int size;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Class to represent an entry in the hash table. Holds a single key-value
|
2001-10-16 07:47:01 +02:00
|
|
|
* pair. This is extended again in LinkedHashMap. See {@link clone()}
|
|
|
|
* for why this must be Cloneable.
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
2001-10-16 07:47:01 +02:00
|
|
|
static class HashEntry extends BasicMapEntry implements Cloneable
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
/** The next entry in the linked list. */
|
|
|
|
HashEntry next;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Simple constructor.
|
|
|
|
* @param key the key
|
|
|
|
* @param value the value
|
|
|
|
*/
|
|
|
|
HashEntry(Object key, Object value)
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2000-12-21 03:00:15 +01:00
|
|
|
super(key, value);
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Called when this entry is removed from the map. This version simply
|
|
|
|
* returns the value, but in LinkedHashMap, it must also do bookkeeping.
|
|
|
|
* @return the value of this key as it is removed.
|
|
|
|
*/
|
|
|
|
Object cleanup()
|
|
|
|
{
|
|
|
|
return value;
|
|
|
|
}
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Construct a new HashMap with the default capacity (11) and the default
|
2000-12-11 04:47:48 +01:00
|
|
|
* load factor (0.75).
|
|
|
|
*/
|
|
|
|
public HashMap()
|
|
|
|
{
|
|
|
|
this(DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Construct a new HashMap from the given Map, with initial capacity
|
|
|
|
* the greater of the size of <code>m</code> or the default of 11.
|
|
|
|
* <p>
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* Every element in Map m will be put into this new HashMap.
|
|
|
|
*
|
|
|
|
* @param m a Map whose key / value pairs will be put into
|
|
|
|
* the new HashMap. <b>NOTE: key / value pairs
|
|
|
|
* are not cloned in this constructor.</b>
|
|
|
|
* @throws NullPointerException if m is null
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public HashMap(Map m)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
this(Math.max(m.size() * 2, DEFAULT_CAPACITY), DEFAULT_LOAD_FACTOR);
|
|
|
|
putAllInternal(m);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Construct a new HashMap with a specific inital capacity and
|
|
|
|
* default load factor of 0.75.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param initialCapacity the initial capacity of this HashMap (>=0)
|
|
|
|
* @throws IllegalArgumentException if (initialCapacity < 0)
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
2001-10-16 07:47:01 +02:00
|
|
|
public HashMap(int initialCapacity)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
|
|
|
this(initialCapacity, DEFAULT_LOAD_FACTOR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Construct a new HashMap with a specific inital capacity and load factor.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param initialCapacity the initial capacity (>=0)
|
|
|
|
* @param loadFactor the load factor (>0, not NaN)
|
|
|
|
* @throws IllegalArgumentException if (initialCapacity < 0) ||
|
|
|
|
* ! (loadFactor > 0.0)
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public HashMap(int initialCapacity, float loadFactor)
|
|
|
|
{
|
2001-02-22 05:16:07 +01:00
|
|
|
if (initialCapacity < 0)
|
2001-10-16 07:47:01 +02:00
|
|
|
throw new IllegalArgumentException("Illegal Capacity: "
|
|
|
|
+ initialCapacity);
|
|
|
|
if (! (loadFactor > 0)) // check for NaN too
|
|
|
|
throw new IllegalArgumentException("Illegal Load: " + loadFactor);
|
2001-03-24 09:05:29 +01:00
|
|
|
|
|
|
|
if (initialCapacity == 0)
|
|
|
|
initialCapacity = 1;
|
2001-10-16 07:47:01 +02:00
|
|
|
buckets = new HashEntry[initialCapacity];
|
2000-12-11 04:47:48 +01:00
|
|
|
this.loadFactor = loadFactor;
|
2001-10-16 07:47:01 +02:00
|
|
|
threshold = (int) (initialCapacity * loadFactor);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns the number of kay-value mappings currently in this Map
|
|
|
|
* @return the size
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public int size()
|
|
|
|
{
|
|
|
|
return size;
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns true if there are no key-value mappings currently in this Map
|
|
|
|
* @return <code>size() == 0</code>
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public boolean isEmpty()
|
|
|
|
{
|
|
|
|
return size == 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Returns true if this HashMap contains a value <pre>o</pre>, such that
|
2000-12-11 04:47:48 +01:00
|
|
|
* <pre>o.equals(value)</pre>.
|
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param value the value to search for in this HashMap
|
|
|
|
* @return true if at least one key maps to the value
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public boolean containsValue(Object value)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
for (int i = buckets.length - 1; i >= 0; i--)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[i];
|
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (value == null ? e.value == null : value.equals(e.value))
|
|
|
|
return true;
|
|
|
|
e = e.next;
|
|
|
|
}
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns true if the supplied object <pre>equals()</pre> a key
|
|
|
|
* in this HashMap.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param key the key to search for in this HashMap
|
|
|
|
* @return true if the key is in the table
|
|
|
|
* @see #containsValue(Object)
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public boolean containsKey(Object key)
|
|
|
|
{
|
|
|
|
int idx = hash(key);
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[idx];
|
2000-12-11 04:47:48 +01:00
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (key == null ? e.key == null : key.equals(e.key))
|
2001-10-16 07:47:01 +02:00
|
|
|
return true;
|
|
|
|
e = e.next;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Return the value in this HashMap associated with the supplied key,
|
|
|
|
* or <pre>null</pre> if the key maps to nothing. NOTE: Since the value
|
|
|
|
* could also be null, you must use containsKey to see if this key
|
|
|
|
* actually maps to something.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param key the key for which to fetch an associated value
|
|
|
|
* @return what the key maps to, if present
|
|
|
|
* @see #put(Object, Object)
|
|
|
|
* @see #containsKey(Object)
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public Object get(Object key)
|
|
|
|
{
|
|
|
|
int idx = hash(key);
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[idx];
|
2000-12-11 04:47:48 +01:00
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (key == null ? e.key == null : key.equals(e.key))
|
2001-10-16 07:47:01 +02:00
|
|
|
return e.value;
|
|
|
|
e = e.next;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Puts the supplied value into the Map, mapped by the supplied key.
|
|
|
|
* The value may be retrieved by any object which <code>equals()</code>
|
|
|
|
* this key. NOTE: Since the prior value could also be null, you must
|
|
|
|
* first use containsKey if you want to see if you are replacing the
|
|
|
|
* key's mapping.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param key the key used to locate the value
|
|
|
|
* @param value the value to be stored in the HashMap
|
|
|
|
* @return the prior mapping of the key, or null if there was none
|
|
|
|
* @see #get(Object)
|
|
|
|
* @see Object#equals(Object)
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public Object put(Object key, Object value)
|
|
|
|
{
|
|
|
|
modCount++;
|
|
|
|
int idx = hash(key);
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[idx];
|
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (key == null ? e.key == null : key.equals(e.key))
|
2001-10-16 07:47:01 +02:00
|
|
|
// Must use this method for necessary bookkeeping in LinkedHashMap.
|
|
|
|
return e.setValue(value);
|
|
|
|
else
|
|
|
|
e = e.next;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
// At this point, we know we need to add a new entry.
|
|
|
|
if (++size > threshold)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
rehash();
|
|
|
|
// Need a new hash value to suit the bigger table.
|
|
|
|
idx = hash(key);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
// LinkedHashMap cannot override put(), hence this call.
|
|
|
|
addEntry(key, value, idx, true);
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Helper method for put, that creates and adds a new Entry. This is
|
|
|
|
* overridden in LinkedHashMap for bookkeeping purposes.
|
|
|
|
*
|
|
|
|
* @param key the key of the new Entry
|
|
|
|
* @param value the value
|
|
|
|
* @param idx the index in buckets where the new Entry belongs
|
|
|
|
* @param callRemove Whether to call the removeEldestEntry method.
|
|
|
|
* @see #put(Object, Object)
|
|
|
|
*/
|
|
|
|
void addEntry(Object key, Object value, int idx, boolean callRemove)
|
|
|
|
{
|
|
|
|
HashEntry e = new HashEntry(key, value);
|
|
|
|
|
2000-12-17 10:15:51 +01:00
|
|
|
e.next = buckets[idx];
|
|
|
|
buckets[idx] = e;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-10-16 07:47:01 +02:00
|
|
|
* Removes from the HashMap and returns the value which is mapped by the
|
|
|
|
* supplied key. If the key maps to nothing, then the HashMap remains
|
|
|
|
* unchanged, and <pre>null</pre> is returned. NOTE: Since the value
|
|
|
|
* could also be null, you must use containsKey to see if you are
|
|
|
|
* actually removing a mapping.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @param key the key used to locate the value to remove
|
|
|
|
* @return whatever the key mapped to, if present
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public Object remove(Object key)
|
|
|
|
{
|
|
|
|
modCount++;
|
|
|
|
int idx = hash(key);
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[idx];
|
|
|
|
HashEntry last = null;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (key == null ? e.key == null : key.equals(e.key))
|
2001-10-16 07:47:01 +02:00
|
|
|
{
|
|
|
|
if (last == null)
|
|
|
|
buckets[idx] = e.next;
|
|
|
|
else
|
|
|
|
last.next = e.next;
|
|
|
|
size--;
|
|
|
|
// Method call necessary for LinkedHashMap to work correctly.
|
|
|
|
return e.cleanup();
|
|
|
|
}
|
|
|
|
last = e;
|
|
|
|
e = e.next;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Copies all elements of the given map into this hashtable. If this table
|
|
|
|
* already has a mapping for a key, the new mapping replaces the current
|
|
|
|
* one.
|
|
|
|
*
|
|
|
|
* @param m the map to be hashed into this
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public void putAll(Map m)
|
|
|
|
{
|
|
|
|
Iterator itr = m.entrySet().iterator();
|
2001-10-16 07:47:01 +02:00
|
|
|
|
|
|
|
for (int msize = m.size(); msize > 0; msize--)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
|
|
|
Map.Entry e = (Map.Entry) itr.next();
|
2001-10-16 07:47:01 +02:00
|
|
|
// Optimize in case the Entry is one of our own.
|
|
|
|
if (e instanceof BasicMapEntry)
|
|
|
|
{
|
|
|
|
BasicMapEntry entry = (BasicMapEntry) e;
|
|
|
|
put(entry.key, entry.value);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2000-12-11 04:47:48 +01:00
|
|
|
put(e.getKey(), e.getValue());
|
2001-10-16 07:47:01 +02:00
|
|
|
}
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Clears the Map so it has no keys. This is O(1).
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public void clear()
|
|
|
|
{
|
|
|
|
modCount++;
|
2001-10-16 07:47:01 +02:00
|
|
|
Arrays.fill(buckets, null);
|
2000-12-11 04:47:48 +01:00
|
|
|
size = 0;
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns a shallow clone of this HashMap. The Map itself is cloned,
|
|
|
|
* but its contents are not. This is O(n).
|
|
|
|
*
|
|
|
|
* @return the clone
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
public Object clone()
|
|
|
|
{
|
|
|
|
HashMap copy = null;
|
|
|
|
try
|
|
|
|
{
|
|
|
|
copy = (HashMap) super.clone();
|
|
|
|
}
|
|
|
|
catch (CloneNotSupportedException x)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// This is impossible.
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
copy.buckets = new HashEntry[buckets.length];
|
|
|
|
copy.putAllInternal(this);
|
2000-12-11 04:47:48 +01:00
|
|
|
return copy;
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns a "set view" of this HashMap's keys. The set is backed by the
|
|
|
|
* HashMap, so changes in one show up in the other. The set supports
|
|
|
|
* element removal, but not element addition.
|
|
|
|
*
|
|
|
|
* @return a set view of the keys
|
|
|
|
* @see #values()
|
|
|
|
* @see #entrySet()
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public Set keySet()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Create an AbstractSet with custom implementations of those methods that
|
|
|
|
// can be overridden easily and efficiently.
|
2000-12-11 04:47:48 +01:00
|
|
|
return new AbstractSet()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2000-12-11 04:47:48 +01:00
|
|
|
public int size()
|
|
|
|
{
|
|
|
|
return size;
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public Iterator iterator()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Cannot create the iterator directly, because of LinkedHashMap.
|
|
|
|
return HashMap.this.iterator(KEYS);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public void clear()
|
|
|
|
{
|
|
|
|
HashMap.this.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
public boolean contains(Object o)
|
|
|
|
{
|
|
|
|
return HashMap.this.containsKey(o);
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public boolean remove(Object o)
|
|
|
|
{
|
|
|
|
// Test against the size of the HashMap to determine if anything
|
HACKING, [...]: Fix spelling errors.
* HACKING, gnu/gcj/xlib/Pixmap.java, gnu/gcj/xlib/XException.java,
gnu/java/rmi/rmic/RMIC.java, java/awt/Window.java,
java/awt/AWTEvent.java, java/io/ByteArrayOutputStream.java,
java/io/CharConversionException.java,
java/io/PipedInputStream.java, java/io/PipedReader.java,
java/io/PrintWriter.java, java/io/WriteAbortedException.java,
java/io/natFileWin32.cc, java/lang/Class.h,
java/lang/natClassLoader.cc, java/lang/natObject.cc,
java/lang/Package.java, java/net/BindException.java,
java/net/ConnectException.java, java/net/ProtocolException.java,
java/net/SocketException.java,
java/net/UnknownServiceException.java,
java/security/cert/X509Certificate.java,
java/security/interfaces/DSAKey.java,
java/security/SecureRandom.java, java/security/SignedObject.java,
java/sql/DatabaseMetaData.java,
java/text/DecimalFormatSymbols.java,
java/util/jar/Attributes.java, java/util/jar/JarEntry.java,
java/util/jar/JarInputStream.java,
java/util/jar/JarOutputStream.java, java/util/Calendar.java,
java/util/Collections.java, java/util/GregorianCalendar.java,
java/util/HashMap.java, java/util/List.java,
java/util/Properties.java, java/util/Timer.java,
java/util/Vector.java, java/util/WeakHashMap.java,
javax/naming/NamingException.java,
testsuite/libjava.lang/Thread_Wait.java,
org/xml/sax/helpers/DefaultHandler.java,
org/xml/sax/HandlerBase.java, org/xml/sax/SAXParseException.java,
ChangeLog, acinclude.m4, aclocal.m4, posix-threads.cc: Fix
spelling errors.
* configure: Regenerate.
From-SVN: r46665
2001-10-31 01:48:17 +01:00
|
|
|
// really got removed. This is necessary because the return value of
|
2001-10-16 07:47:01 +02:00
|
|
|
// HashMap.remove() is ambiguous in the null case.
|
2000-12-11 04:47:48 +01:00
|
|
|
int oldsize = size;
|
|
|
|
HashMap.this.remove(o);
|
2001-10-16 07:47:01 +02:00
|
|
|
return (oldsize != size);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns a "collection view" (or "bag view") of this HashMap's values.
|
|
|
|
* The collection is backed by the HashMap, so changes in one show up
|
|
|
|
* in the other. The collection supports element removal, but not element
|
|
|
|
* addition.
|
|
|
|
*
|
|
|
|
* @return a bag view of the values
|
|
|
|
* @see #keySet()
|
|
|
|
* @see #entrySet()
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public Collection values()
|
|
|
|
{
|
|
|
|
// We don't bother overriding many of the optional methods, as doing so
|
|
|
|
// wouldn't provide any significant performance advantage.
|
|
|
|
return new AbstractCollection()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2000-12-11 04:47:48 +01:00
|
|
|
public int size()
|
|
|
|
{
|
|
|
|
return size;
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public Iterator iterator()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Cannot create the iterator directly, because of LinkedHashMap.
|
|
|
|
return HashMap.this.iterator(VALUES);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public void clear()
|
|
|
|
{
|
|
|
|
HashMap.this.clear();
|
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns a "set view" of this HashMap's entries. The set is backed by
|
|
|
|
* the HashMap, so changes in one show up in the other. The set supports
|
|
|
|
* element removal, but not element addition.
|
|
|
|
* <p>
|
|
|
|
*
|
|
|
|
* Note that the iterators for all three views, from keySet(), entrySet(),
|
|
|
|
* and values(), traverse the HashMap in the same sequence.
|
|
|
|
*
|
|
|
|
* @return a set view of the entries
|
|
|
|
* @see #keySet()
|
|
|
|
* @see #values()
|
|
|
|
* @see Map.Entry
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public Set entrySet()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Create an AbstractSet with custom implementations of those methods that
|
|
|
|
// can be overridden easily and efficiently.
|
2000-12-11 04:47:48 +01:00
|
|
|
return new AbstractSet()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2000-12-11 04:47:48 +01:00
|
|
|
public int size()
|
|
|
|
{
|
|
|
|
return size;
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public Iterator iterator()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Cannot create the iterator directly, because of LinkedHashMap.
|
|
|
|
return HashMap.this.iterator(ENTRIES);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public void clear()
|
|
|
|
{
|
|
|
|
HashMap.this.clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
public boolean contains(Object o)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
return getEntry(o) != null;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
public boolean remove(Object o)
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = getEntry(o);
|
|
|
|
if (e != null)
|
|
|
|
{
|
|
|
|
HashMap.this.remove(e.key);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
return false;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
|
|
|
/** Helper method that returns an index in the buckets array for `key;
|
|
|
|
* based on its hashCode().
|
|
|
|
*
|
|
|
|
* @param key the key
|
|
|
|
* @return the bucket number
|
|
|
|
*/
|
|
|
|
int hash(Object key)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
return (key == null) ? 0 : Math.abs(key.hashCode() % buckets.length);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Helper method for entrySet(), which matches both key and value
|
|
|
|
* simultaneously.
|
|
|
|
*
|
|
|
|
* @param o the entry to match
|
|
|
|
* @return the matching entry, if found, or null
|
|
|
|
* @see #entrySet()
|
|
|
|
*/
|
|
|
|
private HashEntry getEntry(Object o)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
if (!(o instanceof Map.Entry))
|
|
|
|
return null;
|
|
|
|
Map.Entry me = (Map.Entry) o;
|
2000-12-11 04:47:48 +01:00
|
|
|
int idx = hash(me.getKey());
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = buckets[idx];
|
2000-12-11 04:47:48 +01:00
|
|
|
while (e != null)
|
|
|
|
{
|
|
|
|
if (e.equals(me))
|
2001-10-16 07:47:01 +02:00
|
|
|
return e;
|
|
|
|
e = e.next;
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
return null;
|
|
|
|
}
|
2001-10-16 07:47:01 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Increases the size of the HashMap and rehashes all keys to new array
|
|
|
|
* indices; this is called when the addition of a new value would cause
|
|
|
|
* size() > threshold. Note that the existing Entry objects are reused in
|
2000-12-11 04:47:48 +01:00
|
|
|
* the new hash table.
|
2001-10-16 07:47:01 +02:00
|
|
|
* <p>
|
|
|
|
*
|
|
|
|
* This is not specified, but the new size is twice the current size plus
|
|
|
|
* one; this number is not always prime, unfortunately.
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
private void rehash()
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry[] oldBuckets = buckets;
|
|
|
|
|
2000-12-11 04:47:48 +01:00
|
|
|
int newcapacity = (buckets.length * 2) + 1;
|
|
|
|
threshold = (int) (newcapacity * loadFactor);
|
2001-10-16 07:47:01 +02:00
|
|
|
buckets = new HashEntry[newcapacity];
|
|
|
|
|
|
|
|
for (int i = oldBuckets.length - 1; i >= 0; i--)
|
2000-12-11 04:47:48 +01:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry e = oldBuckets[i];
|
2000-12-11 04:47:48 +01:00
|
|
|
while (e != null)
|
2001-10-16 07:47:01 +02:00
|
|
|
{
|
|
|
|
int idx = hash(e.key);
|
|
|
|
HashEntry dest = buckets[idx];
|
|
|
|
|
|
|
|
if (dest != null)
|
|
|
|
{
|
|
|
|
while (dest.next != null)
|
|
|
|
dest = dest.next;
|
|
|
|
dest.next = e;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
buckets[idx] = e;
|
|
|
|
}
|
|
|
|
|
|
|
|
HashEntry next = e.next;
|
|
|
|
e.next = null;
|
|
|
|
e = next;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Generates a parameterized iterator. Must be overrideable, since
|
|
|
|
* LinkedHashMap iterates in a different order.
|
|
|
|
* @param type {@link #KEYS}, {@link #VALUES}, or {@link #ENTRIES}
|
|
|
|
* @return the appropriate iterator
|
|
|
|
*/
|
|
|
|
Iterator iterator(int type)
|
|
|
|
{
|
|
|
|
return new HashIterator(type);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* A simplified, more efficient internal implementation of putAll(). The
|
|
|
|
* Map constructor and clone() should not call putAll or put, in order to
|
|
|
|
* be compatible with the JDK implementation with respect to subclasses.
|
|
|
|
*/
|
|
|
|
void putAllInternal(Map m)
|
|
|
|
{
|
|
|
|
Iterator itr = m.entrySet().iterator();
|
|
|
|
|
|
|
|
for (int msize = m.size(); msize > 0; msize--)
|
|
|
|
{
|
|
|
|
Map.Entry e = (Map.Entry) itr.next();
|
|
|
|
Object key = e.getKey();
|
|
|
|
int idx = hash(key);
|
|
|
|
addEntry(key, e.getValue(), idx, false);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Serializes this object to the given stream.
|
2001-10-16 07:47:01 +02:00
|
|
|
*
|
|
|
|
* @param s the stream to write to
|
|
|
|
* @throws IOException if the underlying stream fails
|
|
|
|
* @serialData the <i>capacity</i>(int) that is the length of the
|
|
|
|
* bucket array, the <i>size</i>(int) of the hash map
|
|
|
|
* are emitted first. They are followed by size entries,
|
|
|
|
* each consisting of a key (Object) and a value (Object).
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
private void writeObject(ObjectOutputStream s) throws IOException
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Write the threshold and loadFactor fields.
|
2000-12-11 04:47:48 +01:00
|
|
|
s.defaultWriteObject();
|
|
|
|
|
|
|
|
s.writeInt(buckets.length);
|
|
|
|
s.writeInt(size);
|
2001-10-16 07:47:01 +02:00
|
|
|
// Avoid creating a wasted Set by creating the iterator directly.
|
|
|
|
Iterator it = iterator(ENTRIES);
|
2000-12-11 04:47:48 +01:00
|
|
|
while (it.hasNext())
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
HashEntry entry = (HashEntry) it.next();
|
|
|
|
s.writeObject(entry.key);
|
|
|
|
s.writeObject(entry.value);
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Deserializes this object from the given stream.
|
2001-10-16 07:47:01 +02:00
|
|
|
*
|
|
|
|
* @param s the stream to read from
|
|
|
|
* @throws ClassNotFoundException if the underlying stream fails
|
|
|
|
* @throws IOException if the underlying stream fails
|
|
|
|
* @serialData the <i>capacity</i>(int) that is the length of the
|
|
|
|
* bucket array, the <i>size</i>(int) of the hash map
|
|
|
|
* are emitted first. They are followed by size entries,
|
|
|
|
* each consisting of a key (Object) and a value (Object).
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
private void readObject(ObjectInputStream s)
|
|
|
|
throws IOException, ClassNotFoundException
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
// Read the threshold and loadFactor fields.
|
2000-12-11 04:47:48 +01:00
|
|
|
s.defaultReadObject();
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
// Read and use capacity.
|
|
|
|
buckets = new HashEntry[s.readInt()];
|
2000-12-11 04:47:48 +01:00
|
|
|
int len = s.readInt();
|
2001-10-16 07:47:01 +02:00
|
|
|
// Already happens automatically.
|
|
|
|
// size = 0;
|
|
|
|
// modCount = 0;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
// Read and use key/value pairs.
|
|
|
|
for ( ; len > 0; len--)
|
|
|
|
put(s.readObject(), s.readObject());
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2001-02-14 05:44:21 +01:00
|
|
|
* Iterate over HashMap's entries.
|
|
|
|
* This implementation is parameterized to give a sequential view of
|
|
|
|
* keys, values, or entries.
|
2000-12-11 04:47:48 +01:00
|
|
|
*
|
2001-10-16 07:47:01 +02:00
|
|
|
* @author Jon Zeppieri
|
2000-12-11 04:47:48 +01:00
|
|
|
*/
|
|
|
|
class HashIterator implements Iterator
|
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* The type of this Iterator: {@link #KEYS}, {@link #VALUES},
|
|
|
|
* or {@link #ENTRIES}.
|
|
|
|
*/
|
|
|
|
final int type;
|
|
|
|
/**
|
|
|
|
* The number of modifications to the backing HashMap that we know about.
|
|
|
|
*/
|
|
|
|
int knownMod = modCount;
|
|
|
|
/** The number of elements remaining to be returned by next(). */
|
|
|
|
int count = size;
|
|
|
|
/** Current index in the physical hash table. */
|
|
|
|
int idx = buckets.length;
|
|
|
|
/** The last Entry returned by a next() call. */
|
|
|
|
HashEntry last;
|
|
|
|
/**
|
|
|
|
* The next entry that should be returned by next(). It is set to something
|
|
|
|
* if we're iterating through a bucket that contains multiple linked
|
|
|
|
* entries. It is null if next() needs to find a new bucket.
|
|
|
|
*/
|
|
|
|
HashEntry next;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Construct a new HashIterator with the supplied type.
|
|
|
|
* @param type {@link #KEYS}, {@link #VALUES}, or {@link #ENTRIES}
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
HashIterator(int type)
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2000-12-11 04:47:48 +01:00
|
|
|
this.type = type;
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns true if the Iterator has more elements.
|
|
|
|
* @return true if there are more elements
|
|
|
|
* @throws ConcurrentModificationException if the HashMap was modified
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public boolean hasNext()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
if (knownMod != modCount)
|
|
|
|
throw new ConcurrentModificationException();
|
|
|
|
return count > 0;
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Returns the next element in the Iterator's sequential view.
|
|
|
|
* @return the next element
|
|
|
|
* @throws ConcurrentModificationException if the HashMap was modified
|
|
|
|
* @throws NoSuchElementException if there is none
|
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public Object next()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
if (knownMod != modCount)
|
|
|
|
throw new ConcurrentModificationException();
|
|
|
|
if (count == 0)
|
2000-12-11 04:47:48 +01:00
|
|
|
throw new NoSuchElementException();
|
2001-10-16 07:47:01 +02:00
|
|
|
count--;
|
|
|
|
HashEntry e = next;
|
2000-12-11 04:47:48 +01:00
|
|
|
|
|
|
|
while (e == null)
|
2001-10-16 07:47:01 +02:00
|
|
|
e = buckets[--idx];
|
2000-12-11 04:47:48 +01:00
|
|
|
|
|
|
|
next = e.next;
|
|
|
|
last = e;
|
|
|
|
if (type == VALUES)
|
|
|
|
return e.value;
|
|
|
|
else if (type == KEYS)
|
|
|
|
return e.key;
|
|
|
|
return e;
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|
|
|
|
|
2001-10-16 07:47:01 +02:00
|
|
|
/**
|
|
|
|
* Removes from the backing HashMap the last element which was fetched
|
|
|
|
* with the <pre>next()</pre> method.
|
|
|
|
* @throws ConcurrentModificationException if the HashMap was modified
|
|
|
|
* @throws IllegalStateException if called when there is no last element
|
2000-08-28 00:06:44 +02:00
|
|
|
*/
|
2000-12-11 04:47:48 +01:00
|
|
|
public void remove()
|
2000-08-28 00:06:44 +02:00
|
|
|
{
|
2001-10-16 07:47:01 +02:00
|
|
|
if (knownMod != modCount)
|
|
|
|
throw new ConcurrentModificationException();
|
2000-12-11 04:47:48 +01:00
|
|
|
if (last == null)
|
2001-10-16 07:47:01 +02:00
|
|
|
throw new IllegalStateException();
|
|
|
|
|
|
|
|
HashMap.this.remove(last.key);
|
|
|
|
knownMod++;
|
|
|
|
last = null;
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|
2000-12-11 04:47:48 +01:00
|
|
|
}
|
2000-08-28 00:06:44 +02:00
|
|
|
}
|