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    }