spring StringTrimmerEditor 源码
spring StringTrimmerEditor 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/propertyeditors/StringTrimmerEditor.java
/*
* Copyright 2002-2019 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 org.springframework.lang.Nullable;
import org.springframework.util.StringUtils;
/**
* Property editor that trims Strings.
*
* <p>Optionally allows transforming an empty string into a {@code null} value.
* Needs to be explicitly registered, e.g. for command binding.
*
* @author Juergen Hoeller
* @see org.springframework.validation.DataBinder#registerCustomEditor
*/
public class StringTrimmerEditor extends PropertyEditorSupport {
@Nullable
private final String charsToDelete;
private final boolean emptyAsNull;
/**
* Create a new StringTrimmerEditor.
* @param emptyAsNull {@code true} if an empty String is to be
* transformed into {@code null}
*/
public StringTrimmerEditor(boolean emptyAsNull) {
this.charsToDelete = null;
this.emptyAsNull = emptyAsNull;
}
/**
* Create a new StringTrimmerEditor.
* @param charsToDelete a set of characters to delete, in addition to
* trimming an input String. Useful for deleting unwanted line breaks:
* e.g. "\r\n\f" will delete all new lines and line feeds in a String.
* @param emptyAsNull {@code true} if an empty String is to be
* transformed into {@code null}
*/
public StringTrimmerEditor(String charsToDelete, boolean emptyAsNull) {
this.charsToDelete = charsToDelete;
this.emptyAsNull = emptyAsNull;
}
@Override
public void setAsText(@Nullable String text) {
if (text == null) {
setValue(null);
}
else {
String value = text.trim();
if (this.charsToDelete != null) {
value = StringUtils.deleteAny(value, this.charsToDelete);
}
if (this.emptyAsNull && value.isEmpty()) {
setValue(null);
}
else {
setValue(value);
}
}
}
@Override
public String getAsText() {
Object value = getValue();
return (value != null ? value.toString() : "");
}
}
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