| /* |
| * Copyright (c) 2008, Rickard Öberg. All Rights Reserved. |
| * |
| * 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.runtime.composite; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| import org.qi4j.functional.Iterables; |
| |
| /** |
| * JAVADOC |
| */ |
| public final class UsesInstance |
| { |
| public static final UsesInstance EMPTY_USES; |
| private final Set<Object> uses; |
| |
| static |
| { |
| EMPTY_USES = new UsesInstance( new HashSet<>() ); |
| } |
| |
| private UsesInstance( HashSet<Object> uses ) |
| { |
| this.uses = Collections.unmodifiableSet( uses ); |
| } |
| |
| public UsesInstance use( Object... objects ) |
| { |
| HashSet<Object> useObjects = new HashSet<>(); |
| if( !uses.isEmpty() ) |
| { |
| useObjects.addAll( uses ); |
| for( Object object : objects ) |
| { |
| Object oldUseForType = useForType( object.getClass() ); |
| if( oldUseForType != null ) |
| { |
| useObjects.remove( oldUseForType ); |
| } |
| } |
| } |
| useObjects.addAll( Arrays.asList( objects ) ); |
| return new UsesInstance( useObjects ); |
| } |
| |
| public Object useForType( Class<?> type ) |
| { |
| // Check instances first |
| for( Object use : uses ) |
| { |
| if( type.isInstance( use ) ) |
| { |
| return use; |
| } |
| } |
| |
| return null; |
| } |
| |
| public Object[] toArray() |
| { |
| return Iterables.toArray( uses ); |
| } |
| |
| @Override |
| public boolean equals( Object o ) |
| { |
| if( this == o ) |
| { |
| return true; |
| } |
| if( o == null || getClass() != o.getClass() ) |
| { |
| return false; |
| } |
| UsesInstance that = (UsesInstance) o; |
| return uses.equals( that.uses ); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return uses.hashCode(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "UsesInstance{" + |
| "uses=" + uses + |
| '}'; |
| } |
| } |