trunk_failed_1.0_release/extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/jsf/AbstractThreadSafeAttributeMap.java - myfaces-scripting - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
  */

 package org.apache.myfaces.extensions.scripting.jsf;

 import java.util.*;


 /**
  * Helper Map implementation for use with different Attribute Maps.
  *
  * @author Anton Koinov (latest modification by $Author: lu4242 $)
  * @version $Revision: 982465 $ $Date: 2010-08-05 06:39:32 +0200 (Do, 05 Aug 2010) $
  */
 public abstract class AbstractThreadSafeAttributeMap<V> extends AbstractMap<String, V>
 {
     private Set<String> _keySet;
     private Collection<V> _values;
     private Set<Entry<String, V>> _entrySet;

     @Override
     public void clear()
     {
         final List<String> names = Collections.list(getAttributeNames());

         for (String name : names)
         {
             removeAttribute(name);
         }
     }

     @Override
     public final boolean containsKey(final Object key)
     {
         return getAttribute(key.toString()) != null;
     }

     @Override
     public boolean containsValue(final Object findValue)
     {
         if (findValue == null)
         {
             return false;
         }

         for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
         {
             final Object value = getAttribute(e.nextElement());
             if (findValue.equals(value))
             {
                 return true;
             }
         }

         return false;
     }

     @Override
     public Set<Entry<String, V>> entrySet()
     {
         return (_entrySet != null) ? _entrySet : (_entrySet = new EntrySet());
     }

     @Override
     public V get(final Object key)
     {
         return getAttribute(key.toString());
     }

     @Override
     public boolean isEmpty()
     {
         return !getAttributeNames().hasMoreElements();
     }

     @Override
     public Set<String> keySet()
     {
         return (_keySet != null) ? _keySet : (_keySet = new KeySet());
     }

     @Override
     public final V put(final String key, final V value)
     {
         final V retval = getAttribute(key);
         setAttribute(key, value);
         return retval;
     }

     @Override
     public void putAll(final Map<? extends String, ? extends V> t)
     {
         for (final Entry<? extends String, ? extends V> entry : t.entrySet())
         {
             setAttribute(entry.getKey(), entry.getValue());
         }
     }

     @Override
     public final V remove(final Object key)
     {
         final String key_ = key.toString();
         final V retval = getAttribute(key_);
         removeAttribute(key_);
         return retval;
     }

     @Override
     public int size()
     {
         int size = 0;
         for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
         {
             size++;
             e.nextElement();
         }
         return size;
     }

     @Override
     public Collection<V> values()
     {
         return (_values != null) ? _values : (_values = new Values());
     }

     abstract protected V getAttribute(String key);

     abstract protected void setAttribute(String key, V value);

     abstract protected void removeAttribute(String key);

     abstract protected Enumeration<String> getAttributeNames();

     private abstract class AbstractAttributeSet<E> extends AbstractSet<E>
     {
         @Override
         public boolean isEmpty()
         {
             return AbstractThreadSafeAttributeMap.this.isEmpty();
         }

         @Override
         public int size()
         {
             return AbstractThreadSafeAttributeMap.this.size();
         }

         @Override
         public void clear()
         {
             AbstractThreadSafeAttributeMap.this.clear();
         }
     }

     private final class KeySet extends AbstractAttributeSet<String>
     {
         @Override
         public Iterator<String> iterator()
         {
             return new KeyIterator();
         }

         @Override
         public boolean contains(final Object o)
         {
             return AbstractThreadSafeAttributeMap.this.containsKey(o);
         }

         @Override
         public boolean remove(final Object o)
         {
             return AbstractThreadSafeAttributeMap.this.remove(o) != null;
         }

     }

     private abstract class AbstractAttributeIterator<E> implements Iterator<E>
     {
         // We use a copied version of the Enumeration from getAttributeNames()
         // here, because directly using it might cause a ConcurrentModificationException
         // when performing remove(). Note that we can do this since the Enumeration
         // from getAttributeNames() will contain exactly the attribute names from the time
         // getAttributeNames() was called and it will not be updated if attributes are
         // removed or added.
         protected final Iterator<String> _i = Collections.list(getAttributeNames()).iterator();
         protected String _currentKey;

         public void remove()
         {
             if (_currentKey == null)
             {
                 throw new NoSuchElementException("You must call next() at least once");
             }
             AbstractThreadSafeAttributeMap.this.remove(_currentKey);
         }

         public boolean hasNext()
         {
             return _i.hasNext();
         }

         public E next()
         {
             return getValue(_currentKey = _i.next());
         }

         protected abstract E getValue(String attributeName);
     }

     private final class KeyIterator extends AbstractAttributeIterator<String>
     {
         @Override
         protected String getValue(final String attributeName)
         {
             return attributeName;
         }
     }

     private class Values extends AbstractAttributeSet<V>
     {
         @Override
         public Iterator<V> iterator()
         {
             return new ValuesIterator();
         }

         @Override
         public boolean contains(final Object o)
         {
             if (o == null)
             {
                 return false;
             }

             for (final Iterator<V> it = iterator(); it.hasNext();)
             {
                 if (o.equals(it.next()))
                 {
                     return true;
                 }
             }

             return false;
         }

         @Override
         public boolean remove(final Object o)
         {
             if (o == null)
             {
                 return false;
             }

             for (final Iterator<V> it = iterator(); it.hasNext();)
             {
                 if (o.equals(it.next()))
                 {
                     it.remove();
                     return true;
                 }
             }

             return false;
         }
     }

     private class ValuesIterator extends AbstractAttributeIterator<V>
     {
         @Override
         protected V getValue(final String attributeName)
         {
             return AbstractThreadSafeAttributeMap.this.get(attributeName);
         }
     }

     private final class EntrySet extends AbstractAttributeSet<Entry<String, V>>
     {
         @Override
         public Iterator<Entry<String, V>> iterator()
         {
             return new EntryIterator();
         }

         @SuppressWarnings("unchecked")
         @Override
         public boolean contains(final Object o)
         {
             if (!(o instanceof Entry))
             {
                 return false;
             }

             final Entry<String, V> entry = (Entry<String, V>)o;
             final Object key = entry.getKey();
             final Object value = entry.getValue();
             if (key == null || value == null)
             {
                 return false;
             }

             return value.equals(AbstractThreadSafeAttributeMap.this.get(key));
         }

         @SuppressWarnings("unchecked")
         @Override
         public boolean remove(final Object o)
         {
             if (!(o instanceof Entry))
             {
                 return false;
             }

             final Entry<String, V> entry = (Entry<String, V>)o;
             final Object key = entry.getKey();
             final Object value = entry.getValue();
             if (key == null || value == null || !value.equals(AbstractThreadSafeAttributeMap.this.get(key)))
             {
                 return false;
             }

             return AbstractThreadSafeAttributeMap.this.remove(((Entry<String, V>)o).getKey()) != null;
         }
     }

     /**
      * Not very efficient since it generates a new instance of <code>Entry</code> for each element and still internaly
      * uses the <code>KeyIterator</code>. It is more efficient to use the <code>KeyIterator</code> directly.
      */
     private final class EntryIterator extends AbstractAttributeIterator<Entry<String, V>>
     {
         @Override
         protected Entry<String, V> getValue(final String attributeName)
         {
             // Must create new Entry every time--value of the entry must stay
             // linked to the same attribute name
             return new EntrySetEntry(attributeName);
         }
     }

     private final class EntrySetEntry implements Entry<String, V>
     {
         private final String _currentKey;

         public EntrySetEntry(final String currentKey)
         {
             _currentKey = currentKey;
         }

         public String getKey()
         {
             return _currentKey;
         }

         public V getValue()
         {
             return AbstractThreadSafeAttributeMap.this.get(_currentKey);
         }

         public V setValue(final V value)
         {
             return AbstractThreadSafeAttributeMap.this.put(_currentKey, value);
         }

         @Override
         public int hashCode()
         {
             int result = 1;
             result = 31 * result + ((_currentKey == null) ? 0 : _currentKey.hashCode());
             return result;
         }

         @Override
         public boolean equals(final Object obj)
         {
             if (this == obj)
                 return true;
             if (obj == null)
                 return false;
             if (getClass() != obj.getClass())
                 return false;
             final EntrySetEntry other = (EntrySetEntry)obj;
             if (_currentKey == null)
             {
                 if (other._currentKey != null)
                     return false;
             }
             else if (!_currentKey.equals(other._currentKey))
                 return false;
             return true;
         }

     }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing,
	* software distributed under the License is distributed on an
	* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
	* KIND, either express or implied. See the License for the
	* specific language governing permissions and limitations
	* under the License.
	*/

	package org.apache.myfaces.extensions.scripting.jsf;

	import java.util.*;


	/**
	* Helper Map implementation for use with different Attribute Maps.
	*
	* @author Anton Koinov (latest modification by $Author: lu4242 $)
	* @version $Revision: 982465 $ $Date: 2010-08-05 06:39:32 +0200 (Do, 05 Aug 2010) $
	*/
	public abstract class AbstractThreadSafeAttributeMap<V> extends AbstractMap<String, V>
	{
	private Set<String> _keySet;
	private Collection<V> _values;
	private Set<Entry<String, V>> _entrySet;

	@Override
	public void clear()
	{
	final List<String> names = Collections.list(getAttributeNames());

	for (String name : names)
	{
	removeAttribute(name);
	}
	}

	@Override
	public final boolean containsKey(final Object key)
	{
	return getAttribute(key.toString()) != null;
	}

	@Override
	public boolean containsValue(final Object findValue)
	{
	if (findValue == null)
	{
	return false;
	}

	for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
	{
	final Object value = getAttribute(e.nextElement());
	if (findValue.equals(value))
	{
	return true;
	}
	}

	return false;
	}

	@Override
	public Set<Entry<String, V>> entrySet()
	{
	return (_entrySet != null) ? _entrySet : (_entrySet = new EntrySet());
	}

	@Override
	public V get(final Object key)
	{
	return getAttribute(key.toString());
	}

	@Override
	public boolean isEmpty()
	{
	return !getAttributeNames().hasMoreElements();
	}

	@Override
	public Set<String> keySet()
	{
	return (_keySet != null) ? _keySet : (_keySet = new KeySet());
	}

	@Override
	public final V put(final String key, final V value)
	{
	final V retval = getAttribute(key);
	setAttribute(key, value);
	return retval;
	}

	@Override
	public void putAll(final Map<? extends String, ? extends V> t)
	{
	for (final Entry<? extends String, ? extends V> entry : t.entrySet())
	{
	setAttribute(entry.getKey(), entry.getValue());
	}
	}

	@Override
	public final V remove(final Object key)
	{
	final String key_ = key.toString();
	final V retval = getAttribute(key_);
	removeAttribute(key_);
	return retval;
	}

	@Override
	public int size()
	{
	int size = 0;
	for (final Enumeration<String> e = getAttributeNames(); e.hasMoreElements();)
	{
	size++;
	e.nextElement();
	}
	return size;
	}

	@Override
	public Collection<V> values()
	{
	return (_values != null) ? _values : (_values = new Values());
	}

	abstract protected V getAttribute(String key);

	abstract protected void setAttribute(String key, V value);

	abstract protected void removeAttribute(String key);

	abstract protected Enumeration<String> getAttributeNames();

	private abstract class AbstractAttributeSet<E> extends AbstractSet<E>
	{
	@Override
	public boolean isEmpty()
	{
	return AbstractThreadSafeAttributeMap.this.isEmpty();
	}

	@Override
	public int size()
	{
	return AbstractThreadSafeAttributeMap.this.size();
	}

	@Override
	public void clear()
	{
	AbstractThreadSafeAttributeMap.this.clear();
	}
	}

	private final class KeySet extends AbstractAttributeSet<String>
	{
	@Override
	public Iterator<String> iterator()
	{
	return new KeyIterator();
	}

	@Override
	public boolean contains(final Object o)
	{
	return AbstractThreadSafeAttributeMap.this.containsKey(o);
	}

	@Override
	public boolean remove(final Object o)
	{
	return AbstractThreadSafeAttributeMap.this.remove(o) != null;
	}

	}

	private abstract class AbstractAttributeIterator<E> implements Iterator<E>
	{
	// We use a copied version of the Enumeration from getAttributeNames()
	// here, because directly using it might cause a ConcurrentModificationException
	// when performing remove(). Note that we can do this since the Enumeration
	// from getAttributeNames() will contain exactly the attribute names from the time
	// getAttributeNames() was called and it will not be updated if attributes are
	// removed or added.
	protected final Iterator<String> _i = Collections.list(getAttributeNames()).iterator();
	protected String _currentKey;

	public void remove()
	{
	if (_currentKey == null)
	{
	throw new NoSuchElementException("You must call next() at least once");
	}
	AbstractThreadSafeAttributeMap.this.remove(_currentKey);
	}

	public boolean hasNext()
	{
	return _i.hasNext();
	}

	public E next()
	{
	return getValue(_currentKey = _i.next());
	}

	protected abstract E getValue(String attributeName);
	}

	private final class KeyIterator extends AbstractAttributeIterator<String>
	{
	@Override
	protected String getValue(final String attributeName)
	{
	return attributeName;
	}
	}

	private class Values extends AbstractAttributeSet<V>
	{
	@Override
	public Iterator<V> iterator()
	{
	return new ValuesIterator();
	}

	@Override
	public boolean contains(final Object o)
	{
	if (o == null)
	{
	return false;
	}

	for (final Iterator<V> it = iterator(); it.hasNext();)
	{
	if (o.equals(it.next()))
	{
	return true;
	}
	}

	return false;
	}

	@Override
	public boolean remove(final Object o)
	{
	if (o == null)
	{
	return false;
	}

	for (final Iterator<V> it = iterator(); it.hasNext();)
	{
	if (o.equals(it.next()))
	{
	it.remove();
	return true;
	}
	}

	return false;
	}
	}

	private class ValuesIterator extends AbstractAttributeIterator<V>
	{
	@Override
	protected V getValue(final String attributeName)
	{
	return AbstractThreadSafeAttributeMap.this.get(attributeName);
	}
	}

	private final class EntrySet extends AbstractAttributeSet<Entry<String, V>>
	{
	@Override
	public Iterator<Entry<String, V>> iterator()
	{
	return new EntryIterator();
	}

	@SuppressWarnings("unchecked")
	@Override
	public boolean contains(final Object o)
	{
	if (!(o instanceof Entry))
	{
	return false;
	}

	final Entry<String, V> entry = (Entry<String, V>)o;
	final Object key = entry.getKey();
	final Object value = entry.getValue();
	if (key == null \|\| value == null)
	{
	return false;
	}

	return value.equals(AbstractThreadSafeAttributeMap.this.get(key));
	}

	@SuppressWarnings("unchecked")
	@Override
	public boolean remove(final Object o)
	{
	if (!(o instanceof Entry))
	{
	return false;
	}

	final Entry<String, V> entry = (Entry<String, V>)o;
	final Object key = entry.getKey();
	final Object value = entry.getValue();
	if (key == null \|\| value == null \|\| !value.equals(AbstractThreadSafeAttributeMap.this.get(key)))
	{
	return false;
	}

	return AbstractThreadSafeAttributeMap.this.remove(((Entry<String, V>)o).getKey()) != null;
	}
	}

	/**
	* Not very efficient since it generates a new instance of <code>Entry</code> for each element and still internaly
	* uses the <code>KeyIterator</code>. It is more efficient to use the <code>KeyIterator</code> directly.
	*/
	private final class EntryIterator extends AbstractAttributeIterator<Entry<String, V>>
	{
	@Override
	protected Entry<String, V> getValue(final String attributeName)
	{
	// Must create new Entry every time--value of the entry must stay
	// linked to the same attribute name
	return new EntrySetEntry(attributeName);
	}
	}

	private final class EntrySetEntry implements Entry<String, V>
	{
	private final String _currentKey;

	public EntrySetEntry(final String currentKey)
	{
	_currentKey = currentKey;
	}

	public String getKey()
	{
	return _currentKey;
	}

	public V getValue()
	{
	return AbstractThreadSafeAttributeMap.this.get(_currentKey);
	}

	public V setValue(final V value)
	{
	return AbstractThreadSafeAttributeMap.this.put(_currentKey, value);
	}

	@Override
	public int hashCode()
	{
	int result = 1;
	result = 31 * result + ((_currentKey == null) ? 0 : _currentKey.hashCode());
	return result;
	}

	@Override
	public boolean equals(final Object obj)
	{
	if (this == obj)
	return true;
	if (obj == null)
	return false;
	if (getClass() != obj.getClass())
	return false;
	final EntrySetEntry other = (EntrySetEntry)obj;
	if (_currentKey == null)
	{
	if (other._currentKey != null)
	return false;
	}
	else if (!_currentKey.equals(other._currentKey))
	return false;
	return true;
	}

	}
	}