| /** |
| * |
| * Copyright 2009-2011 Rickard Öberg AB |
| * |
| * 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.qi4j.library.rest.server.api; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.qi4j.functional.Iterables; |
| import org.restlet.Request; |
| |
| /** |
| * Manage the current object selection. An instance of ObjectSelection |
| * is created for each request, and stored as an attribute. |
| * Whenever an object is identified in the chain, add it to the selection. |
| */ |
| public class ObjectSelection |
| { |
| public static ObjectSelection current() |
| { |
| return (ObjectSelection) Request.getCurrent().getAttributes().get( "selection" ); |
| } |
| |
| public static <T> T type( Class<T> type ) |
| { |
| ObjectSelection selection = current(); |
| if( selection == null ) |
| { |
| throw new IllegalStateException( "No current selection" ); |
| } |
| |
| return selection.get( type ); |
| } |
| |
| public static void newSelection() |
| { |
| Request.getCurrent().getAttributes().put( "selection", new ObjectSelection() ); |
| } |
| |
| private List<Object> selection = new ArrayList<Object>(); |
| |
| /** |
| * Create new root roleMap |
| */ |
| public ObjectSelection() |
| { |
| } |
| |
| public void select( Object object ) |
| { |
| selection.add( 0, object ); |
| } |
| |
| public <T> T get( Class<T> type ) |
| throws IllegalArgumentException |
| { |
| for( Object object : selection ) |
| { |
| if( type.isInstance( object ) ) |
| { |
| return (T) object; |
| } |
| } |
| throw new IllegalArgumentException( "No object in selection for type:" + type.getSimpleName() ); |
| } |
| |
| public Iterable<Object> selection() |
| { |
| return selection; |
| } |
| |
| public Object[] toArray() |
| { |
| return Iterables.toArray( Object.class, selection ); |
| } |
| } |