| /* |
| * 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.felix.ipojo.manipulator.metadata.annotation.registry; |
| |
| import org.apache.felix.ipojo.manipulator.Reporter; |
| import org.apache.felix.ipojo.manipulator.metadata.annotation.ComponentWorkbench; |
| import org.apache.felix.ipojo.manipulator.spi.BindingContext; |
| import org.apache.felix.ipojo.manipulator.util.ChainedAnnotationVisitor; |
| import org.objectweb.asm.AnnotationVisitor; |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.FieldVisitor; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Type; |
| import org.objectweb.asm.tree.ClassNode; |
| import org.objectweb.asm.tree.FieldNode; |
| import org.objectweb.asm.tree.MethodNode; |
| |
| import java.lang.annotation.ElementType; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A {@link Selection} is used to select a subset of all supported {@link AnnotationVisitor}. |
| * It's a query DSL. |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class Selection { |
| |
| private BindingRegistry registry; |
| private ComponentWorkbench workbench; |
| private Reporter reporter; |
| private FieldNode field; |
| private MethodNode method; |
| private ClassNode clazz; |
| private int index = BindingContext.NO_INDEX; |
| private String annotation; |
| private ElementType elementType = null; |
| private Object visitor; |
| |
| public Selection(BindingRegistry registry, ComponentWorkbench workbench, Reporter reporter) { |
| this.registry = registry; |
| this.workbench = workbench; |
| this.reporter = reporter; |
| } |
| |
| public Selection field(FieldVisitor visitor, FieldNode node) { |
| this.visitor = visitor; |
| this.field = node; |
| this.elementType = ElementType.FIELD; |
| return this; |
| } |
| |
| public Selection method(MethodVisitor visitor, MethodNode node) { |
| this.visitor = visitor; |
| this.method = node; |
| this.elementType = ElementType.METHOD; |
| return this; |
| } |
| |
| public Selection type(ClassVisitor visitor, ClassNode node) { |
| this.visitor = visitor; |
| this.clazz = node; |
| this.elementType = ElementType.TYPE; |
| return this; |
| } |
| |
| public Selection parameter(MethodVisitor visitor, MethodNode node, int index) { |
| this.visitor = visitor; |
| this.index = index; |
| this.method = node; |
| this.elementType = ElementType.PARAMETER; |
| return this; |
| } |
| |
| public Selection annotatedWith(String desc) { |
| this.annotation = desc; |
| return this; |
| } |
| |
| public AnnotationVisitor get() { |
| List<AnnotationVisitor> visitors = list(); |
| |
| if (visitors.isEmpty()) { |
| return null; |
| } |
| |
| if (visitors.size() == 1) { |
| return visitors.get(0); |
| } |
| |
| ChainedAnnotationVisitor chained = new ChainedAnnotationVisitor(); |
| chained.getVisitors().addAll(visitors); |
| return chained; |
| } |
| |
| private List<AnnotationVisitor> list() { |
| BindingContext context; |
| |
| if (elementType == ElementType.FIELD) { |
| context = new BindingContext(workbench, reporter, Type.getType(annotation), field, |
| elementType, index, visitor); |
| } else if (elementType == ElementType.TYPE) { |
| context = new BindingContext(workbench, reporter, Type.getType(annotation), clazz, |
| elementType, index, visitor); |
| } else { |
| // Parameter of method. |
| context = new BindingContext(workbench, reporter, Type.getType(annotation), method, |
| elementType, index, visitor); |
| } |
| |
| |
| List<Binding> predicates = registry.getBindings(annotation); |
| |
| List<AnnotationVisitor> visitors = new ArrayList<AnnotationVisitor>(); |
| if (predicates != null && !predicates.isEmpty()) { |
| collectMatchingVisitors(predicates, context, visitors); |
| } |
| return visitors; |
| } |
| |
| |
| private void collectMatchingVisitors(List<Binding> bindings, BindingContext context, List<AnnotationVisitor> visitors) { |
| for (Binding binding : bindings) { |
| if (binding.getPredicate().matches(context)) { |
| AnnotationVisitor visitor = binding.getFactory().newAnnotationVisitor(context); |
| if (visitor != null) { |
| visitors.add(visitor); |
| } |
| } |
| } |
| } |
| |
| } |