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 }