spring ClassArrayEditor 源码
spring ClassArrayEditor 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/propertyeditors/ClassArrayEditor.java
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.beans.propertyeditors;
import java.beans.PropertyEditorSupport;
import java.util.StringJoiner;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Property editor for an array of {@link Class Classes}, to enable
* the direct population of a {@code Class[]} property without having to
* use a {@code String} class name property as bridge.
*
* <p>Also supports "java.lang.String[]"-style array class names, in contrast
* to the standard {@link Class#forName(String)} method.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @since 2.0
*/
public class ClassArrayEditor extends PropertyEditorSupport {
@Nullable
private final ClassLoader classLoader;
/**
* Create a default {@code ClassEditor}, using the thread
* context {@code ClassLoader}.
*/
public ClassArrayEditor() {
this(null);
}
/**
* Create a default {@code ClassArrayEditor}, using the given
* {@code ClassLoader}.
* @param classLoader the {@code ClassLoader} to use
* (or pass {@code null} for the thread context {@code ClassLoader})
*/
public ClassArrayEditor(@Nullable ClassLoader classLoader) {
this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());
}
@Override
public void setAsText(String text) throws IllegalArgumentException {
if (StringUtils.hasText(text)) {
String[] classNames = StringUtils.commaDelimitedListToStringArray(text);
Class<?>[] classes = new Class<?>[classNames.length];
for (int i = 0; i < classNames.length; i++) {
String className = classNames[i].trim();
classes[i] = ClassUtils.resolveClassName(className, this.classLoader);
}
setValue(classes);
}
else {
setValue(null);
}
}
@Override
public String getAsText() {
Class<?>[] classes = (Class[]) getValue();
if (ObjectUtils.isEmpty(classes)) {
return "";
}
StringJoiner sj = new StringJoiner(",");
for (Class<?> klass : classes) {
sj.add(ClassUtils.getQualifiedName(klass));
}
return sj.toString();
}
}
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