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.component.bean;
018    
019    import org.apache.camel.spi.ClassResolver;
020    import org.apache.camel.util.ObjectHelper;
021    import org.apache.camel.util.StringHelper;
022    
023    /**
024     * Helper for the bean component.
025     */
026    public final class BeanHelper {
027    
028        private BeanHelper() {
029            // utility class
030        }
031    
032        /**
033         * Determines if the given value is valid according to the supported
034         * values by the bean component.
035         *
036         * @param value the value
037         * @return <tt>true</tt> if valid, <tt>false</tt> otherwise
038         */
039        public static boolean isValidParameterValue(String value) {
040            if (ObjectHelper.isEmpty(value)) {
041                // empty value is valid
042                return true;
043            }
044    
045            // trim value
046            value = value.trim();
047    
048            // single quoted is valid
049            if (value.startsWith("'") && value.endsWith("'")) {
050                return true;
051            }
052    
053            // double quoted is valid
054            if (value.startsWith("\"") && value.endsWith("\"")) {
055                return true;
056            }
057    
058            // true or false is valid (boolean)
059            if (value.equals("true") || value.equals("false")) {
060                return true;
061            }
062    
063            // null is valid (to force a null value)
064            if (value.equals("null")) {
065                return true;
066            }
067    
068            // simple language tokens is valid
069            if (StringHelper.hasStartToken(value, "simple")) {
070                return true;
071            }
072    
073            // numeric is valid
074            boolean numeric = true;
075            for (char ch : value.toCharArray()) {
076                if (!Character.isDigit(ch)) {
077                    numeric = false;
078                    break;
079                }
080            }
081            return numeric;
082        }
083    
084        /**
085         * Determines if the given parameter type is assignable to the expected type.
086         * <p/>
087         * This implementation will check if the given parameter type matches the expected type as class using either
088         * <ul>
089         *     <li>FQN class name - com.foo.MyOrder</li>
090         *     <li>Simple class name - MyOrder</li>
091         * </ul>
092         * If the given parameter type is <b>not</b> a class, then <tt>null</tt> is returned
093         *
094         * @param resolver          the class resolver
095         * @param parameterType     the parameter type as a String, can be a FQN or a simple name of the class
096         * @param expectedType      the expected type
097         * @return <tt>null</tt> if parameter type is <b>not</b> a class, <tt>true</tt> if parameter type is assignable, <tt>false</tt> if not assignable
098         */
099        public static Boolean isAssignableToExpectedType(ClassResolver resolver, String parameterType, Class<?> expectedType) {
100            // if its a class, then it should be assignable
101            Class<?> parameterClass = resolver.resolveClass(parameterType);
102            if (parameterClass == null && parameterType.equals(expectedType.getSimpleName())) {
103                // it was not the FQN class name, but the simple name instead, which matched
104                return true;
105            }
106    
107            // not a class so return null
108            if (parameterClass == null) {
109                return null;
110            }
111    
112            // if there was a class, then it must be assignable to match
113            return parameterClass.isAssignableFrom(expectedType);
114        }
115    
116    }