spring ValueFormatter 源码
spring ValueFormatter 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/tags/form/ValueFormatter.java
/*
* Copyright 2002-2018 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.web.servlet.tags.form;
import java.beans.PropertyEditor;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;
import org.springframework.web.util.HtmlUtils;
/**
* Package-visible helper class for formatting values for rendering via a form tag.
* Supports two styles of formatting: plain and {@link PropertyEditor}-aware.
*
* <p>Plain formatting simply prevents the string '{@code null}' from appearing,
* replacing it with an empty String, and adds HTML escaping as required.
*
* <p>{@link PropertyEditor}-aware formatting will attempt to use the supplied
* {@link PropertyEditor} to render any non-String value before applying the
* default rules of plain formatting.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @since 2.0
*/
abstract class ValueFormatter {
/**
* Build the display value of the supplied {@code Object}, HTML escaped
* as required. This version is <strong>not</strong> {@link PropertyEditor}-aware.
* @see #getDisplayString(Object, java.beans.PropertyEditor, boolean)
*/
public static String getDisplayString(@Nullable Object value, boolean htmlEscape) {
String displayValue = ObjectUtils.getDisplayString(value);
return (htmlEscape ? HtmlUtils.htmlEscape(displayValue) : displayValue);
}
/**
* Build the display value of the supplied {@code Object}, HTML escaped
* as required. If the supplied value is not a {@link String} and the supplied
* {@link PropertyEditor} is not null then the {@link PropertyEditor} is used
* to obtain the display value.
* @see #getDisplayString(Object, boolean)
*/
public static String getDisplayString(
@Nullable Object value, @Nullable PropertyEditor propertyEditor, boolean htmlEscape) {
if (propertyEditor != null && !(value instanceof String)) {
try {
propertyEditor.setValue(value);
String text = propertyEditor.getAsText();
if (text != null) {
return getDisplayString(text, htmlEscape);
}
}
catch (Throwable ex) {
// The PropertyEditor might not support this value... pass through.
}
}
return getDisplayString(value, htmlEscape);
}
}
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