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From erodrig...@apache.org
Subject svn commit: r354219 - in /directory/network/trunk/src/java/org/apache/mina/handler/chain/impl: ChainBase.java CommandBase.java ContextBase.java
Date Mon, 05 Dec 2005 23:19:46 GMT
Author: erodriguez
Date: Mon Dec  5 15:19:41 2005
New Revision: 354219

URL: http://svn.apache.org/viewcvs?rev=354219&view=rev
Log:
Implementations for handler chain interfaces.

Added:
    directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java   (with
props)
    directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java 
 (with props)
    directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java 
 (with props)

Added: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java
URL: http://svn.apache.org/viewcvs/directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java?rev=354219&view=auto
==============================================================================
--- directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java (added)
+++ directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java Mon
Dec  5 15:19:41 2005
@@ -0,0 +1,223 @@
+/*
+ *   Copyright 2005 The Apache Software Foundation
+ *
+ *   Licensed 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.mina.handler.chain.impl;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.apache.mina.handler.chain.Chain;
+import org.apache.mina.handler.chain.Command;
+import org.apache.mina.handler.chain.Context;
+import org.apache.mina.handler.chain.Filter;
+
+/**
+ * <p>Convenience base class for {@link Chain} implementations.</p>
+ *
+ * @version $Revision: 1.6 $ $Date: 2004/11/30 05:52:23 $
+ */
+public class ChainBase implements Chain
+{
+    // ----------------------------------------------------------- Constructors
+
+    /**
+     * <p>Construct a {@link Chain} with no configured {@link Command}s.</p>
+     */
+    public ChainBase()
+    {
+
+    }
+
+    /**
+     * <p>Construct a {@link Chain} configured with the specified
+     * {@link Command}.</p>
+     *
+     * @param command The {@link Command} to be configured
+     *
+     * @exception IllegalArgumentException if <code>command</code>
+     *  is <code>null</code>
+     */
+    public ChainBase( Command command )
+    {
+        addCommand( command );
+    }
+
+    /**
+     * <p>Construct a {@link Chain} configured with the specified
+     * {@link Command}s.</p>
+     *
+     * @param commands The {@link Command}s to be configured
+     *
+     * @exception IllegalArgumentException if <code>commands</code>,
+     *  or one of the individual {@link Command} elements,
+     *  is <code>null</code>
+     */
+    public ChainBase( Command[] commands )
+    {
+        if ( commands == null )
+        {
+            throw new IllegalArgumentException();
+        }
+
+        for ( int i = 0; i < commands.length; i++ )
+        {
+            addCommand( commands[ i ] );
+        }
+    }
+
+    /**
+     * <p>Construct a {@link Chain} configured with the specified
+     * {@link Command}s.</p>
+     *
+     * @param commands The {@link Command}s to be configured
+     *
+     * @exception IllegalArgumentException if <code>commands</code>,
+     *  or one of the individual {@link Command} elements,
+     *  is <code>null</code>
+     */
+    public ChainBase( Collection commands )
+    {
+        if ( commands == null )
+        {
+            throw new IllegalArgumentException();
+        }
+
+        Iterator elements = commands.iterator();
+        while ( elements.hasNext() )
+        {
+            addCommand( (Command) elements.next() );
+        }
+    }
+
+    // ----------------------------------------------------- Instance Variables
+
+    /**
+     * <p>The list of {@link Command}s configured for this {@link Chain}, in
+     * the order in which they may delegate processing to the remainder of
+     * the {@link Chain}.</p>
+     */
+    protected Command[] commands = new Command[ 0 ];
+
+    /**
+     * <p>Flag indicating whether the configuration of our commands list
+     * has been frozen by a call to the <code>execute()</code> method.</p>
+     */
+    protected boolean frozen = false;
+
+    // ---------------------------------------------------------- Chain Methods
+
+    // Documented in Chain interface
+    public void addCommand( Command command )
+    {
+        if ( command == null )
+        {
+            throw new IllegalArgumentException();
+        }
+
+        if ( frozen )
+        {
+            throw new IllegalStateException();
+        }
+
+        Command[] results = new Command[ commands.length + 1 ];
+        System.arraycopy( commands, 0, results, 0, commands.length );
+        results[ commands.length ] = command;
+        commands = results;
+    }
+
+    // Documented in Chain interface
+    public boolean execute( Context context ) throws Exception
+    {
+        // Verify our parameters
+        if ( context == null )
+        {
+            throw new IllegalArgumentException();
+        }
+
+        // Freeze the configuration of the command list
+        frozen = true;
+
+        // Execute the commands in this list until one returns true
+        // or throws an exception
+        boolean saveResult = false;
+        Exception saveException = null;
+        int i = 0;
+        int n = commands.length;
+        ;
+        for ( i = 0; i < n; i++ )
+        {
+            try
+            {
+                saveResult = commands[ i ].execute( context );
+                if ( saveResult )
+                {
+                    break;
+                }
+            }
+            catch ( Exception e )
+            {
+                saveException = e;
+                break;
+            }
+        }
+
+        // Call postprocess methods on Filters in reverse order
+        if ( i >= n )
+        { // Fell off the end of the chain
+            i--;
+        }
+        boolean handled = false;
+        boolean result = false;
+        for ( int j = i; j >= 0; j-- )
+        {
+            if ( commands[ j ] instanceof Filter )
+            {
+                try
+                {
+                    result = ( (Filter) commands[ j ] ).postprocess( context, saveException
);
+                    if ( result )
+                    {
+                        handled = true;
+                    }
+                }
+                catch ( Exception e )
+                {
+                    ; // Silently ignore
+                }
+            }
+        }
+
+        // Return the exception or result state from the last execute()
+        if ( ( saveException != null ) && !handled )
+        {
+            throw saveException;
+        }
+
+        return ( saveResult );
+    }
+
+    // -------------------------------------------------------- Package Methods
+
+    /**
+     * <p>Return an array of the configured {@link Command}s for this
+     * {@link Chain}.  This method is package private, and is used only
+     * for the unit tests.</p>
+     */
+    Command[] getCommands()
+    {
+        return ( commands );
+    }
+}

Propchange: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ChainBase.java
------------------------------------------------------------------------------
    svn:eol-style = native

Added: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java
URL: http://svn.apache.org/viewcvs/directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java?rev=354219&view=auto
==============================================================================
--- directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java (added)
+++ directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java Mon
Dec  5 15:19:41 2005
@@ -0,0 +1,31 @@
+/*
+ *   Copyright 2005 The Apache Software Foundation
+ *
+ *   Licensed 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.mina.handler.chain.impl;
+
+import org.apache.mina.handler.chain.Command;
+
+/**
+ * <p>Convenience base class for {@link Command} implementations.</p>
+ *
+ * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
+ * @version $Rev$
+ */
+public abstract class CommandBase implements Command
+{
+    public static final boolean STOP_CHAIN = true;
+    public static final boolean CONTINUE_CHAIN = false;
+}

Propchange: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/CommandBase.java
------------------------------------------------------------------------------
    svn:eol-style = native

Added: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java
URL: http://svn.apache.org/viewcvs/directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java?rev=354219&view=auto
==============================================================================
--- directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java (added)
+++ directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java Mon
Dec  5 15:19:41 2005
@@ -0,0 +1,818 @@
+/*
+ *   Copyright 2005 The Apache Software Foundation
+ *
+ *   Licensed 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.mina.handler.chain.impl;
+
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.Method;
+import java.util.AbstractCollection;
+import java.util.AbstractSet;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.mina.handler.chain.Context;
+
+/**
+ * <p>Convenience base class for {@link Context} implementations.</p>
+ *
+ * <p>In addition to the minimal functionality required by the {@link Context}
+ * interface, this class implements the recommended support for
+ * <em>Attribute-Property Transparency</p>.  This is implemented by
+ * analyzing the available JavaBeans properties of this class (or its
+ * subclass), exposes them as key-value pairs in the <code>Map</code>,
+ * with the key being the name of the property itself.</p>
+ *
+ * <p><strong>IMPLEMENTATION NOTE</strong> - Because <code>empty</code>
is a
+ * read-only property defined by the <code>Map</code> interface, it may not
+ * be utilized as an attribute key or property name.</p>
+ *
+ * @version $Revision: 1.7 $ $Date: 2004/11/30 05:52:23 $
+ */
+public class ContextBase extends HashMap implements Context
+{
+    private static final long serialVersionUID = -8689626090218484993L;
+
+    /**
+     * Default, no argument constructor.
+     */
+    public ContextBase()
+    {
+        super();
+        initialize();
+    }
+
+    /**
+     * <p>Initialize the contents of this {@link Context} by copying the
+     * values from the specified <code>Map</code>.  Any keys in <code>map</code>
+     * that correspond to local properties will cause the setter method for
+     * that property to be called.</p>
+     *
+     * @param map Map whose key-value pairs are added
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  writing a local property value
+     * @exception UnsupportedOperationException if a local property does not
+     *  have a write method.
+     */
+    public ContextBase( Map map )
+    {
+        super( map );
+        initialize();
+        putAll( map );
+    }
+
+    // ------------------------------------------------------ Instance Variables
+
+    /**
+     * <p>The <code>PropertyDescriptor</code>s for all JavaBeans properties
+     * of this {@link Context} implementation class, keyed by property name.
+     * This collection is allocated only if there are any JavaBeans
+     * properties.</p>
+     */
+    private Map descriptors = null;
+
+    /**
+     * <p>The same <code>PropertyDescriptor</code>s as an array.</p>
+     */
+    private PropertyDescriptor[] pd = null;
+
+    /**
+     * <p>Distinguished singleton value that is stored in the map for each
+     * key that is actually a property.  This value is used to ensure that
+     * <code>equals()</code> comparisons will always fail.</p>
+     */
+    private static Object singleton;
+
+    static
+    {
+        singleton = new Object()
+        {
+            public boolean equals( Object object )
+            {
+                return ( false );
+            }
+        };
+    }
+
+    /**
+     * <p>Zero-length array of parameter values for calling property getters.
+     * </p>
+     */
+    private static Object[] zeroParams = new Object[ 0 ];
+
+    // ------------------------------------------------------------- Map Methods
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to clear all keys
and
+     * values except those corresponding to JavaBeans properties.</p>
+     */
+    public void clear()
+    {
+        if ( descriptors == null )
+        {
+            super.clear();
+        }
+        else
+        {
+            Iterator keys = keySet().iterator();
+            while ( keys.hasNext() )
+            {
+                Object key = keys.next();
+                if ( !descriptors.containsKey( key ) )
+                {
+                    keys.remove();
+                }
+            }
+        }
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return
+     * <code>true</code> if the specified value is present in either the
+     * underlying <code>Map</code> or one of the local property values.</p>
+     *
+     * @exception IllegalArgumentException if a property getter
+     *  throws an exception
+     */
+    public boolean containsValue( Object value )
+    {
+        // Case 1 -- no local properties
+        if ( descriptors == null )
+        {
+            return ( super.containsValue( value ) );
+        }
+        // Case 2 -- value found in the underlying Map
+        else
+            if ( super.containsValue( value ) )
+            {
+                return ( true );
+            }
+
+        // Case 3 -- check the values of our readable properties
+        for ( int i = 0; i < pd.length; i++ )
+        {
+            if ( pd[ i ].getReadMethod() != null )
+            {
+                Object prop = readProperty( pd[ i ] );
+                if ( value == null )
+                {
+                    if ( prop == null )
+                    {
+                        return ( true );
+                    }
+                }
+                else
+                    if ( value.equals( prop ) )
+                    {
+                        return ( true );
+                    }
+            }
+        }
+
+        return ( false );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return a
+     * <code>Set</code> that meets the specified default behavior except
+     * for attempts to remove the key for a property of the {@link Context}
+     * implementation class, which will throw
+     * <code>UnsupportedOperationException</code>.</p>
+     */
+    public Set entrySet()
+    {
+        return ( new EntrySetImpl() );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return the
value
+     * of a local property if the specified key matches a local property name.
+     * </p>
+     *
+     * <p><strong>IMPLEMENTATION NOTE</strong> - If the specified
+     * <code>key</code> identifies a write-only property, <code>null</code>
+     * will arbitrarily be returned, in order to avoid difficulties implementing
+     * the contracts of the <code>Map</code> interface.</p>
+     *
+     * @param key Key of the value to be returned
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  reading this local property value
+     * @exception UnsupportedOperationException if this local property does not
+     *  have a read method.
+     */
+    public Object get( Object key )
+    {
+        // Case 1 -- no local properties
+        if ( descriptors == null )
+        {
+            return ( super.get( key ) );
+        }
+
+        // Case 2 -- this is a local property
+        if ( key != null )
+        {
+            PropertyDescriptor descriptor = (PropertyDescriptor) descriptors.get( key );
+            if ( descriptor != null )
+            {
+                if ( descriptor.getReadMethod() != null )
+                {
+                    return ( readProperty( descriptor ) );
+                }
+                else
+                {
+                    return ( null );
+                }
+            }
+        }
+
+        // Case 3 -- retrieve value from our underlying Map
+        return ( super.get( key ) );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return
+     * <code>true</code> if the underlying <code>Map</code> only
contains
+     * key-value pairs for local properties (if any).</p>
+     */
+    public boolean isEmpty()
+    {
+        // Case 1 -- no local properties
+        if ( descriptors == null )
+        {
+            return ( super.isEmpty() );
+        }
+
+        // Case 2 -- compare key count to property count
+        return ( super.size() <= descriptors.size() );
+
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return a
+     * <code>Set</code> that meets the specified default behavior except
+     * for attempts to remove the key for a property of the {@link Context}
+     * implementation class, which will throw
+     * <code>UnsupportedOperationException</code>.</p>
+     */
+    public Set keySet()
+    {
+        return ( super.keySet() );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to set the value
+     * of a local property if the specified key matches a local property name.
+     * </p>
+     *
+     * @param key Key of the value to be stored or replaced
+     * @param value New value to be stored
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  reading or wrting this local property value
+     * @exception UnsupportedOperationException if this local property does not
+     *  have both a read method and a write method
+     */
+    public Object put( Object key, Object value )
+    {
+        // Case 1 -- no local properties
+        if ( descriptors == null )
+        {
+            return ( super.put( key, value ) );
+        }
+
+        // Case 2 -- this is a local property
+        if ( key != null )
+        {
+            PropertyDescriptor descriptor = (PropertyDescriptor) descriptors.get( key );
+            if ( descriptor != null )
+            {
+                Object previous = null;
+                if ( descriptor.getReadMethod() != null )
+                {
+                    previous = readProperty( descriptor );
+                }
+                writeProperty( descriptor, value );
+                return ( previous );
+            }
+        }
+
+        // Case 3 -- store or replace value in our underlying map
+        return ( super.put( key, value ) );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to call the
+     * <code>put()</code> method individually for each key-value pair
+     * in the specified <code>Map</code>.</p>
+     *
+     * @param map <code>Map</code> containing key-value pairs to store
+     *  (or replace)
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  reading or wrting a local property value
+     * @exception UnsupportedOperationException if a local property does not
+     *  have both a read method and a write method
+     */
+    public void putAll( Map map )
+    {
+        Iterator pairs = map.entrySet().iterator();
+        while ( pairs.hasNext() )
+        {
+            Map.Entry pair = (Map.Entry) pairs.next();
+            put( pair.getKey(), pair.getValue() );
+        }
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to throw
+     * <code>UnsupportedOperationException</code> on any attempt to
+     * remove a key that is the name of a local property.</p>
+     *
+     * @param key Key to be removed
+     *
+     * @exception UnsupportedOperationException if the specified
+     *  <code>key</code> matches the name of a local property
+     */
+    public Object remove( Object key )
+    {
+        // Case 1 -- no local properties
+        if ( descriptors == null )
+        {
+            return ( super.remove( key ) );
+        }
+
+        // Case 2 -- this is a local property
+        if ( key != null )
+        {
+            PropertyDescriptor descriptor = (PropertyDescriptor) descriptors.get( key );
+            if ( descriptor != null )
+            {
+                throw new UnsupportedOperationException( "Local property '" + key + "' cannot
be removed" );
+            }
+        }
+
+        // Case 3 -- remove from underlying Map
+        return ( super.remove( key ) );
+    }
+
+    /**
+     * <p>Override the default <code>Map</code> behavior to return a
+     * <code>Collection</code> that meets the specified default behavior except
+     * for attempts to remove the key for a property of the {@link Context}
+     * implementation class, which will throw
+     * <code>UnsupportedOperationException</code>.</p>
+     */
+    public Collection values()
+    {
+        return ( new ValuesImpl() );
+    }
+
+    // --------------------------------------------------------- Private Methods
+
+    /**
+     * <p>Eliminate the specified property descriptor from the list of
+     * property descriptors in <code>pd</code>.</p>
+     *
+     * @param name Name of the property to eliminate
+     *
+     * @exception IllegalArgumentException if the specified property name
+     *  is not present
+     */
+    private void eliminate( String name )
+    {
+        int j = -1;
+        for ( int i = 0; i < pd.length; i++ )
+        {
+            if ( name.equals( pd[ i ].getName() ) )
+            {
+                j = i;
+                break;
+            }
+        }
+
+        if ( j < 0 )
+        {
+            throw new IllegalArgumentException( "Property '" + name + "' is not present"
);
+        }
+
+        PropertyDescriptor[] results = new PropertyDescriptor[ pd.length - 1 ];
+        System.arraycopy( pd, 0, results, 0, j );
+        System.arraycopy( pd, j + 1, results, j, pd.length - ( j + 1 ) );
+        pd = results;
+    }
+
+    /**
+     * <p>Return an <code>Iterator</code> over the set of <code>Map.Entry</code>
+     * objects representing our key-value pairs.</p>
+     */
+    private Iterator entriesIterator()
+    {
+        return ( new EntrySetIterator() );
+    }
+
+    /**
+     * <p>Return a <code>Map.Entry</code> for the specified key value,
if it
+     * is present; otherwise, return <code>null</code>.</p>
+     *
+     * @param key Attribute key or property name
+     */
+    private Map.Entry entry( Object key )
+    {
+        if ( containsKey( key ) )
+        {
+            return ( new MapEntryImpl( key, get( key ) ) );
+        }
+        else
+        {
+            return ( null );
+        }
+    }
+
+    /**
+     * <p>Customize the contents of our underlying <code>Map</code> so
that
+     * it contains keys corresponding to all of the JavaBeans properties of
+     * the {@link Context} implementation class.</p>
+     *
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  writing this local property value
+     * @exception UnsupportedOperationException if this local property does not
+     *  have a write method.
+     */
+    private void initialize()
+    {
+        // Retrieve the set of property descriptors for this Context class
+        try
+        {
+            pd = Introspector.getBeanInfo( getClass() ).getPropertyDescriptors();
+        }
+        catch ( IntrospectionException e )
+        {
+            pd = new PropertyDescriptor[ 0 ]; // Should never happen
+        }
+        eliminate( "class" ); // Because of "getClass()"
+        eliminate( "empty" ); // Because of "isEmpty()"
+
+        // Initialize the underlying Map contents
+        if ( pd.length > 0 )
+        {
+            descriptors = new HashMap();
+            for ( int i = 0; i < pd.length; i++ )
+            {
+                descriptors.put( pd[ i ].getName(), pd[ i ] );
+                super.put( pd[ i ].getName(), singleton );
+            }
+        }
+
+    }
+
+    /**
+     * <p>Get and return the value for the specified property.</p>
+     *
+     * @param descriptor <code>PropertyDescriptor</code> for the
+     *  specified property
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  reading this local property value
+     * @exception UnsupportedOperationException if this local property does not
+     *  have a read method.
+     */
+    private Object readProperty( PropertyDescriptor descriptor )
+    {
+        try
+        {
+            Method method = descriptor.getReadMethod();
+            if ( method == null )
+            {
+                throw new UnsupportedOperationException( "Property '" + descriptor.getName()
+ "' is not readable" );
+            }
+            return ( method.invoke( this, zeroParams ) );
+        }
+        catch ( Exception e )
+        {
+            throw new UnsupportedOperationException( "Exception reading property '" + descriptor.getName()
+ "': "
+                    + e.getMessage() );
+        }
+    }
+
+    /**
+     * <p>Remove the specified key-value pair, if it exists, and return
+     * <code>true</code>.  If this pair does not exist, return
+     * <code>false</code>.</p>
+     *
+     * @param entry Key-value pair to be removed
+     *
+     * @exception UnsupportedOperationException if the specified key
+     *  identifies a property instead of an attribute
+     */
+    private boolean remove( Map.Entry entry )
+    {
+        Map.Entry actual = entry( entry.getKey() );
+        if ( actual == null )
+        {
+            return ( false );
+        }
+        else
+            if ( !entry.equals( actual ) )
+            {
+                return ( false );
+            }
+            else
+            {
+                remove( entry.getKey() );
+                return ( true );
+            }
+    }
+
+    /**
+     * <p>Return an <code>Iterator</code> over the set of values in this
+     * <code>Map</code>.</p>
+     */
+    private Iterator valuesIterator()
+    {
+        return ( new ValuesIterator() );
+    }
+
+    /**
+     * <p>Set the value for the specified property.</p>
+     *
+     * @param descriptor <code>PropertyDescriptor</code> for the
+     *  specified property
+     * @param value The new value for this property (must be of the
+     *  correct type)
+     *
+     * @exception IllegalArgumentException if an exception is thrown
+     *  writing this local property value
+     * @exception UnsupportedOperationException if this local property does not
+     *  have a write method.
+     */
+    private void writeProperty( PropertyDescriptor descriptor, Object value )
+    {
+        try
+        {
+            Method method = descriptor.getWriteMethod();
+            if ( method == null )
+            {
+                throw new UnsupportedOperationException( "Property '" + descriptor.getName()
+ "' is not writeable" );
+            }
+            method.invoke( this, new Object[] { value } );
+        }
+        catch ( Exception e )
+        {
+            throw new UnsupportedOperationException( "Exception writing property '" + descriptor.getName()
+ "': "
+                    + e.getMessage() );
+        }
+    }
+
+    // --------------------------------------------------------- Private Classes
+
+    /**
+     * <p>Private implementation of <code>Set</code> that implements the
+     * semantics required for the value returned by <code>entrySet()</code>.</p>
+     */
+    private class EntrySetImpl extends AbstractSet
+    {
+        public void clear()
+        {
+            ContextBase.this.clear();
+        }
+
+        public boolean contains( Object obj )
+        {
+            if ( !( obj instanceof Map.Entry ) )
+            {
+                return ( false );
+            }
+            Map.Entry entry = (Map.Entry) obj;
+            Entry actual = ContextBase.this.entry( entry.getKey() );
+            if ( actual != null )
+            {
+                return ( actual.equals( entry ) );
+            }
+            else
+            {
+                return ( false );
+            }
+        }
+
+        public boolean isEmpty()
+        {
+            return ( ContextBase.this.isEmpty() );
+        }
+
+        public Iterator iterator()
+        {
+            return ( ContextBase.this.entriesIterator() );
+        }
+
+        public boolean remove( Object obj )
+        {
+            if ( obj instanceof Map.Entry )
+            {
+                return ( ContextBase.this.remove( (Map.Entry) obj ) );
+            }
+            else
+            {
+                return ( false );
+            }
+        }
+
+        public int size()
+        {
+            return ( ContextBase.this.size() );
+        }
+    }
+
+    /**
+     * <p>Private implementation of <code>Iterator</code> for the
+     * <code>Set</code> returned by <code>entrySet()</code>.</p>
+     */
+    private class EntrySetIterator implements Iterator
+    {
+        Map.Entry entry = null;
+        private Iterator keys = ContextBase.this.keySet().iterator();
+
+        public boolean hasNext()
+        {
+            return ( keys.hasNext() );
+        }
+
+        public Object next()
+        {
+            entry = ContextBase.this.entry( keys.next() );
+            return ( entry );
+        }
+
+        public void remove()
+        {
+            ContextBase.this.remove( entry );
+        }
+
+    }
+
+    /**
+     * <p>Private implementation of <code>Map.Entry</code> for each item
in
+     * <code>EntrySetImpl</code>.</p>
+     */
+    private class MapEntryImpl implements Map.Entry
+    {
+        MapEntryImpl( Object key, Object value )
+        {
+            this.key = key;
+            this.value = value;
+        }
+
+        private Object key;
+        private Object value;
+
+        public boolean equals( Object obj )
+        {
+            if ( obj == null )
+            {
+                return ( false );
+            }
+            else
+                if ( !( obj instanceof Map.Entry ) )
+                {
+                    return ( false );
+                }
+            Map.Entry entry = (Map.Entry) obj;
+            if ( key == null )
+            {
+                return ( entry.getKey() == null );
+            }
+            if ( key.equals( entry.getKey() ) )
+            {
+                if ( value == null )
+                {
+                    return ( entry.getValue() == null );
+                }
+                else
+                {
+                    return ( value.equals( entry.getValue() ) );
+                }
+            }
+            else
+            {
+                return ( false );
+            }
+        }
+
+        public Object getKey()
+        {
+            return ( this.key );
+        }
+
+        public Object getValue()
+        {
+            return ( this.value );
+        }
+
+        public int hashCode()
+        {
+            return ( ( ( key == null ) ? 0 : key.hashCode() ) ^ ( ( value == null ) ? 0 :
value.hashCode() ) );
+        }
+
+        public Object setValue( Object value )
+        {
+            Object previous = this.value;
+            ContextBase.this.put( this.key, value );
+            this.value = value;
+            return ( previous );
+        }
+    }
+
+    /**
+     * <p>Private implementation of <code>Collection</code> that implements
the
+     * semantics required for the value returned by <code>values()</code>.</p>
+     */
+    private class ValuesImpl extends AbstractCollection
+    {
+        public void clear()
+        {
+            ContextBase.this.clear();
+        }
+
+        public boolean contains( Object obj )
+        {
+            if ( !( obj instanceof Map.Entry ) )
+            {
+                return ( false );
+            }
+            Map.Entry entry = (Map.Entry) obj;
+            return ( ContextBase.this.containsValue( entry.getValue() ) );
+        }
+
+        public boolean isEmpty()
+        {
+            return ( ContextBase.this.isEmpty() );
+        }
+
+        public Iterator iterator()
+        {
+            return ( ContextBase.this.valuesIterator() );
+        }
+
+        public boolean remove( Object obj )
+        {
+            if ( obj instanceof Map.Entry )
+            {
+                return ( ContextBase.this.remove( (Map.Entry) obj ) );
+            }
+            else
+            {
+                return ( false );
+            }
+        }
+
+        public int size()
+        {
+            return ( ContextBase.this.size() );
+        }
+    }
+
+    /**
+     * <p>Private implementation of <code>Iterator</code> for the
+     * <code>Collection</code> returned by <code>values()</code>.</p>
+     */
+    private class ValuesIterator implements Iterator
+    {
+        Map.Entry entry = null;
+        private Iterator keys = ContextBase.this.keySet().iterator();
+
+        public boolean hasNext()
+        {
+            return ( keys.hasNext() );
+        }
+
+        public Object next()
+        {
+            entry = ContextBase.this.entry( keys.next() );
+            return ( entry.getValue() );
+        }
+
+        public void remove()
+        {
+            ContextBase.this.remove( entry );
+        }
+    }
+}

Propchange: directory/network/trunk/src/java/org/apache/mina/handler/chain/impl/ContextBase.java
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