javafx.util.converter.FormatStringConverter Maven / Gradle / Ivy
/*
* Copyright (c) 2010, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javafx.util.converter;
import java.text.*;
import javafx.beans.NamedArg;
import javafx.util.StringConverter;
/**
* {@link StringConverter} implementation that can use a {@link Format}
* instance.
*
* @since JavaFX 2.2
*/
public class FormatStringConverter extends StringConverter {
// ------------------------------------------------------ Private properties
final Format format;
// ------------------------------------------------------------ Constructors
/**
* Creates a {@code FormatStringConverter} for the given {@code Format} instance.
* @param format the {@code Format} instance
*/
public FormatStringConverter(@NamedArg("format") Format format) {
this.format = format;
}
// ------------------------------------------------------- Converter Methods
/** {@inheritDoc} */
@Override public T fromString(String value) {
// If the specified value is null or zero-length, return null
if (value == null) {
return null;
}
value = value.trim();
if (value.length() < 1) {
return null;
}
// Create and configure the parser to be used
Format _format = getFormat();
// Perform the requested parsing, and attempt to conver the output
// back to T
final ParsePosition pos = new ParsePosition(0);
T result = (T) _format.parseObject(value, pos);
if (pos.getIndex() != value.length()) {
throw new RuntimeException("Parsed string not according to the format");
}
return result;
}
/** {@inheritDoc} */
@Override public String toString(T value) {
// If the specified value is null, return a zero-length String
if (value == null) {
return "";
}
// Create and configure the formatter to be used
Format _format = getFormat();
// Perform the requested formatting
return _format.format(value);
}
/**
* Return a Format instance to use for formatting
* and parsing in this {@link StringConverter}.
*
* @return a {@code Format} instance for formatting and parsing in this {@link StringConverter}
*/
protected Format getFormat() {
return format;
}
}