001 /* 002 * Copyright (C) 2012 eXo Platform SAS. 003 * 004 * This is free software; you can redistribute it and/or modify it 005 * under the terms of the GNU Lesser General Public License as 006 * published by the Free Software Foundation; either version 2.1 of 007 * the License, or (at your option) any later version. 008 * 009 * This software is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * 014 * You should have received a copy of the GNU Lesser General Public 015 * License along with this software; if not, write to the Free 016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 018 */ 019 020 package org.crsh.util; 021 022 import java.util.AbstractMap; 023 import java.util.AbstractSet; 024 import java.util.Iterator; 025 import java.util.Set; 026 027 public abstract class SimpleMap<K, V> extends AbstractMap<K, V> { 028 029 protected abstract Iterator<K> keys(); 030 031 @Override 032 public abstract V get(Object key); 033 034 @Override 035 public final boolean containsKey(Object key) { 036 return get(key) != null; 037 } 038 039 @Override 040 public final Set<Entry<K, V>> entrySet() { 041 return entries; 042 } 043 044 private AbstractSet<Entry<K, V>> entries = new AbstractSet<Entry<K, V>>() { 045 046 @Override 047 public Iterator<Entry<K, V>> iterator() { 048 final Iterator<K> names = keys(); 049 return new Iterator<Entry<K, V>>() { 050 public boolean hasNext() { 051 return names.hasNext(); 052 } 053 054 public Entry<K, V> next() { 055 final K name = names.next(); 056 return new Entry<K, V>() { 057 public K getKey() { 058 return name; 059 } 060 061 public V getValue() { 062 return get(name); 063 } 064 065 public V setValue(V value) { 066 throw new UnsupportedOperationException(); 067 } 068 }; 069 } 070 071 public void remove() { 072 throw new UnsupportedOperationException(); 073 } 074 }; 075 } 076 077 @Override 078 public int size() { 079 int size = 0; 080 for (Iterator<K> names = keys();names.hasNext();) { 081 size++; 082 names.next(); 083 } 084 return size; 085 } 086 }; 087 }