001/*
002 * Copyright 2002-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.beans.propertyeditors;
018
019import java.beans.PropertyEditorSupport;
020
021import org.springframework.lang.Nullable;
022import org.springframework.util.ClassUtils;
023import org.springframework.util.StringUtils;
024
025/**
026 * Property editor for {@link Class java.lang.Class}, to enable the direct
027 * population of a {@code Class} property without recourse to having to use a
028 * String class name property as bridge.
029 *
030 * <p>Also supports "java.lang.String[]"-style array class names, in contrast to the
031 * standard {@link Class#forName(String)} method.
032 *
033 * @author Juergen Hoeller
034 * @author Rick Evans
035 * @since 13.05.2003
036 * @see Class#forName
037 * @see org.springframework.util.ClassUtils#forName(String, ClassLoader)
038 */
039public class ClassEditor extends PropertyEditorSupport {
040
041        @Nullable
042        private final ClassLoader classLoader;
043
044
045        /**
046         * Create a default ClassEditor, using the thread context ClassLoader.
047         */
048        public ClassEditor() {
049                this(null);
050        }
051
052        /**
053         * Create a default ClassEditor, using the given ClassLoader.
054         * @param classLoader the ClassLoader to use
055         * (or {@code null} for the thread context ClassLoader)
056         */
057        public ClassEditor(@Nullable ClassLoader classLoader) {
058                this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());
059        }
060
061
062        @Override
063        public void setAsText(String text) throws IllegalArgumentException {
064                if (StringUtils.hasText(text)) {
065                        setValue(ClassUtils.resolveClassName(text.trim(), this.classLoader));
066                }
067                else {
068                        setValue(null);
069                }
070        }
071
072        @Override
073        public String getAsText() {
074                Class<?> clazz = (Class<?>) getValue();
075                if (clazz != null) {
076                        return ClassUtils.getQualifiedName(clazz);
077                }
078                else {
079                        return "";
080                }
081        }
082
083}