001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.impl.scan;
018
019 import java.util.HashSet;
020 import java.util.Set;
021
022 import org.apache.camel.spi.PackageScanFilter;
023
024 /**
025 * Package scan filter for testing if a given class is assignable to another class.
026 */
027 public class AssignableToPackageScanFilter implements PackageScanFilter {
028 private final Set<Class> parents = new HashSet<Class>();
029
030 public AssignableToPackageScanFilter() {
031 }
032
033 public AssignableToPackageScanFilter(Class parentType) {
034 parents.add(parentType);
035 }
036
037 public AssignableToPackageScanFilter(Set<Class> parents) {
038 this.parents.addAll(parents);
039 }
040
041 public void addParentType(Class parentType) {
042 parents.add(parentType);
043 }
044
045 public boolean matches(Class type) {
046 if (parents != null && parents.size() > 0) {
047 for (Class parent : parents) {
048 if (parent.isAssignableFrom(type)) {
049 return true;
050 }
051 }
052 }
053 return false;
054 }
055
056 @Override
057 public String toString() {
058 StringBuilder sb = new StringBuilder();
059 for (Class parent : parents) {
060 sb.append(parent.getSimpleName()).append(", ");
061 }
062 sb.setLength(sb.length() > 0 ? sb.length() - 2 : 0);
063 return "is assignable to any of " + sb;
064 }
065
066 }