| /** |
| * |
| * 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.constraint; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import org.qi4j.api.constraint.Constraint; |
| import org.qi4j.api.constraint.ConstraintDeclaration; |
| import org.qi4j.api.constraint.Constraints; |
| import org.qi4j.library.rest.server.api.ObjectSelection; |
| |
| /** |
| * Annotation on interactions that requires objects of specific types |
| * to be available in the ObjectSelection. |
| * |
| * Example: |
| * <pre> |
| * @Requires(File.class) |
| * public Representation content() {...} |
| * </pre> |
| */ |
| @ConstraintDeclaration |
| @Retention( RetentionPolicy.RUNTIME ) |
| @Constraints( Requires.RequiresRoleConstraint.class ) |
| public @interface Requires |
| { |
| Class<?>[] value(); |
| |
| class RequiresRoleConstraint |
| implements Constraint<Requires, ObjectSelection> |
| { |
| @Override |
| public boolean isValid( Requires requires, ObjectSelection objectSelection ) |
| { |
| for( Class<?> roleClass : requires.value() ) |
| { |
| try |
| { |
| objectSelection.get( roleClass ); |
| } |
| catch( IllegalArgumentException ex ) |
| { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| } |