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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* 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
* http://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.databene.commons.format;
import java.text.FieldPosition;
import java.text.Format;
import java.text.ParsePosition;
/**
* Wraps another {@link Format} and overrides the mapping from a null value to a string and vice versa.
* Created: 28.02.2013 16:20:55
* @since 0.5.21
* @author Volker Bergmann
*/
public class NullSafeFormat extends Format {
private static final long serialVersionUID = 2203854824964382584L;
private Format realFormat;
private String nullString;
public NullSafeFormat(Format realFormat, String nullString) {
this.realFormat = realFormat;
this.nullString = nullString;
}
@Override
public StringBuffer format(Object obj, StringBuffer toAppendTo, FieldPosition pos) {
if (obj == null)
return toAppendTo.append(nullString);
return realFormat.format(obj, toAppendTo, pos);
}
@Override
public Object parseObject(String source, ParsePosition pos) {
if (nullString.equals(source.substring(pos.getIndex())))
return null;
return realFormat.parseObject(source, pos);
}
}