spring ConvertingPropertyEditorAdapter 源码
spring ConvertingPropertyEditorAdapter 代码
文件路径：/spring-core/src/main/java/org/springframework/core/convert/support/ConvertingPropertyEditorAdapter.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.core.convert.support;
import java.beans.PropertyEditorSupport;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Adapter that exposes a {@link java.beans.PropertyEditor} for any given
* {@link org.springframework.core.convert.ConversionService} and specific target type.
*
* @author Juergen Hoeller
* @since 3.0
*/
public class ConvertingPropertyEditorAdapter extends PropertyEditorSupport {
private final ConversionService conversionService;
private final TypeDescriptor targetDescriptor;
private final boolean canConvertToString;
/**
* Create a new ConvertingPropertyEditorAdapter for a given
* {@link org.springframework.core.convert.ConversionService}
* and the given target type.
* @param conversionService the ConversionService to delegate to
* @param targetDescriptor the target type to convert to
*/
public ConvertingPropertyEditorAdapter(ConversionService conversionService, TypeDescriptor targetDescriptor) {
Assert.notNull(conversionService, "ConversionService must not be null");
Assert.notNull(targetDescriptor, "TypeDescriptor must not be null");
this.conversionService = conversionService;
this.targetDescriptor = targetDescriptor;
this.canConvertToString = conversionService.canConvert(this.targetDescriptor, TypeDescriptor.valueOf(String.class));
}
@Override
public void setAsText(@Nullable String text) throws IllegalArgumentException {
setValue(this.conversionService.convert(text, TypeDescriptor.valueOf(String.class), this.targetDescriptor));
}
@Override
@Nullable
public String getAsText() {
if (this.canConvertToString) {
return (String) this.conversionService.convert(getValue(), this.targetDescriptor, TypeDescriptor.valueOf(String.class));
}
else {
return null;
}
}
}
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