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 */
017package org.apache.camel.impl.scan;
018
019import java.util.HashSet;
020import java.util.Set;
021
022import org.apache.camel.spi.PackageScanFilter;
023
024/**
025 * Package scan filter for testing if a given class is assignable to another class.
026 */
027public 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}