| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.beanutils2.converters; |
| |
| /** |
| * {@link org.apache.commons.beanutils2.Converter} implementaion that handles conversion |
| * to and from <b>java.lang.Class</b> objects. |
| * <p> |
| * The class will be loaded from the thread context class |
| * loader (if it exists); otherwise the class loader that loaded this class |
| * will be used. |
| * <p> |
| * Can be configured to either return a <i>default value</i> or throw a |
| * <code>ConversionException</code> if a conversion error occurs. |
| * |
| * @since 1.4 |
| */ |
| public final class ClassConverter extends AbstractConverter { |
| |
| /** |
| * Construct a <b>java.lang.Class</b> <i>Converter</i> that throws |
| * a <code>ConversionException</code> if an error occurs. |
| */ |
| public ClassConverter() { |
| super(); |
| } |
| |
| /** |
| * Construct a <b>java.lang.Class</b> <i>Converter</i> that returns |
| * a default value if an error occurs. |
| * |
| * @param defaultValue The default value to be returned |
| * if the value to be converted is missing or an error |
| * occurs converting the value. |
| */ |
| public ClassConverter(final Object defaultValue) { |
| super(defaultValue); |
| } |
| |
| /** |
| * Return the default type this <code>Converter</code> handles. |
| * |
| * @return The default type this <code>Converter</code> handles. |
| * @since 1.8.0 |
| */ |
| @Override |
| protected Class<?> getDefaultType() { |
| return Class.class; |
| } |
| |
| /** |
| * <p>Convert a java.lang.Class or object into a String.</p> |
| * |
| * @param value The input value to be converted |
| * @return the converted String value. |
| * @since 1.8.0 |
| */ |
| @Override |
| protected String convertToString(final Object value) { |
| return value instanceof Class ? ((Class<?>)value).getName() : value.toString(); |
| } |
| |
| /** |
| * <p>Convert the input object into a java.lang.Class.</p> |
| * |
| * @param <T> Target type of the conversion. |
| * @param type Data type to which this value should be converted. |
| * @param value The input value to be converted. |
| * @return The converted value. |
| * @throws Throwable if an error occurs converting to the specified type |
| * @since 1.8.0 |
| */ |
| @Override |
| protected <T> T convertToType(final Class<T> type, final Object value) throws Throwable { |
| if (Class.class.equals(type)) { |
| ClassLoader classLoader = Thread.currentThread() |
| .getContextClassLoader(); |
| if (classLoader != null) { |
| try { |
| return type.cast(classLoader.loadClass(value.toString())); |
| } catch (final ClassNotFoundException ex) { |
| // Don't fail, carry on and try this class's class loader |
| // (see issue# BEANUTILS-263) |
| } |
| } |
| |
| // Try this class's class loader |
| classLoader = ClassConverter.class.getClassLoader(); |
| return type.cast(classLoader.loadClass(value.toString())); |
| } |
| |
| throw conversionException(type, value); |
| } |
| |
| } |