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;
020import java.util.StringJoiner;
021
022import org.springframework.lang.Nullable;
023import org.springframework.util.ClassUtils;
024import org.springframework.util.ObjectUtils;
025import org.springframework.util.StringUtils;
026
027/**
028 * Property editor for an array of {@link Class Classes}, to enable
029 * the direct population of a {@code Class[]} property without having to
030 * use a {@code String} class name property as bridge.
031 *
032 * <p>Also supports "java.lang.String[]"-style array class names, in contrast
033 * to the standard {@link Class#forName(String)} method.
034 *
035 * @author Rob Harrop
036 * @author Juergen Hoeller
037 * @since 2.0
038 */
039public class ClassArrayEditor extends PropertyEditorSupport {
040
041        @Nullable
042        private final ClassLoader classLoader;
043
044
045        /**
046         * Create a default {@code ClassEditor}, using the thread
047         * context {@code ClassLoader}.
048         */
049        public ClassArrayEditor() {
050                this(null);
051        }
052
053        /**
054         * Create a default {@code ClassArrayEditor}, using the given
055         * {@code ClassLoader}.
056         * @param classLoader the {@code ClassLoader} to use
057         * (or pass {@code null} for the thread context {@code ClassLoader})
058         */
059        public ClassArrayEditor(@Nullable ClassLoader classLoader) {
060                this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());
061        }
062
063
064        @Override
065        public void setAsText(String text) throws IllegalArgumentException {
066                if (StringUtils.hasText(text)) {
067                        String[] classNames = StringUtils.commaDelimitedListToStringArray(text);
068                        Class<?>[] classes = new Class<?>[classNames.length];
069                        for (int i = 0; i < classNames.length; i++) {
070                                String className = classNames[i].trim();
071                                classes[i] = ClassUtils.resolveClassName(className, this.classLoader);
072                        }
073                        setValue(classes);
074                }
075                else {
076                        setValue(null);
077                }
078        }
079
080        @Override
081        public String getAsText() {
082                Class<?>[] classes = (Class[]) getValue();
083                if (ObjectUtils.isEmpty(classes)) {
084                        return "";
085                }
086                StringJoiner sj = new StringJoiner(",");
087                for (Class<?> klass : classes) {
088                        sj.add(ClassUtils.getQualifiedName(klass));
089                }
090                return sj.toString();
091        }
092
093}