spring-batch FormatterLineAggregator 源码
spring-batch FormatterLineAggregator 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/transform/FormatterLineAggregator.java
/*
* Copyright 2006-2007 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.batch.item.file.transform;
import java.util.Formatter;
import java.util.Locale;
import org.springframework.util.Assert;
/**
* A {@link LineAggregator} implementation which produces a String by aggregating the
* provided item via the {@link Formatter} syntax.<br>
*
* @see Formatter
* @author Dave Syer
*/
public class FormatterLineAggregator<T> extends ExtractorLineAggregator<T> {
private String format;
private Locale locale = Locale.getDefault();
private int maximumLength = 0;
private int minimumLength = 0;
/**
* Public setter for the minimum length of the formatted string. If this is not set
* the default is to allow any length.
* @param minimumLength the minimum length to set
*/
public void setMinimumLength(int minimumLength) {
this.minimumLength = minimumLength;
}
/**
* Public setter for the maximum length of the formatted string. If this is not set
* the default is to allow any length.
* @param maximumLength the maximum length to set
*/
public void setMaximumLength(int maximumLength) {
this.maximumLength = maximumLength;
}
/**
* Set the format string used to aggregate items.
* @param format {@link String} containing the format to use.
*
* @see Formatter
*/
public void setFormat(String format) {
this.format = format;
}
/**
* Public setter for the locale.
* @param locale the locale to set
*/
public void setLocale(Locale locale) {
this.locale = locale;
}
@Override
protected String doAggregate(Object[] fields) {
Assert.notNull(format, "A format is required");
String value = String.format(locale, format, fields);
if (maximumLength > 0) {
Assert.state(value.length() <= maximumLength, String.format(
"String overflowed in formatter -" + " longer than %d characters: [%s", maximumLength, value));
}
if (minimumLength > 0) {
Assert.state(value.length() >= minimumLength, String.format(
"String underflowed in formatter -" + " shorter than %d characters: [%s", minimumLength, value));
}
return value;
}
}
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