infra.beans.propertyeditors.CustomDateEditor Maven / Gradle / Ivy
/*
* Copyright 2017 - 2024 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [https://www.gnu.org/licenses/]
*/
package infra.beans.propertyeditors;
import java.beans.PropertyEditorSupport;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import infra.lang.Nullable;
import infra.util.StringUtils;
/**
* Property editor for {@code java.util.Date},
* supporting a custom {@code java.text.DateFormat}.
*
* This is not meant to be used as system PropertyEditor but rather
* as locale-specific date editor within custom controller code,
* parsing user-entered number strings into Date properties of beans
* and rendering them in the UI form.
*
*
In web MVC code, this editor will typically be registered with
* {@code binder.registerCustomEditor}.
*
* @author Juergen Hoeller
* @see Date
* @see DateFormat
* @see infra.validation.DataBinder#registerCustomEditor
* @since 4.0
*/
public class CustomDateEditor extends PropertyEditorSupport {
private final DateFormat dateFormat;
private final boolean allowEmpty;
private final int exactDateLength;
/**
* Create a new CustomDateEditor instance, using the given DateFormat
* for parsing and rendering.
*
The "allowEmpty" parameter states if an empty String should
* be allowed for parsing, i.e. get interpreted as null value.
* Otherwise, an IllegalArgumentException gets thrown in that case.
*
* @param dateFormat the DateFormat to use for parsing and rendering
* @param allowEmpty if empty strings should be allowed
*/
public CustomDateEditor(DateFormat dateFormat, boolean allowEmpty) {
this.dateFormat = dateFormat;
this.allowEmpty = allowEmpty;
this.exactDateLength = -1;
}
/**
* Create a new CustomDateEditor instance, using the given DateFormat
* for parsing and rendering.
*
The "allowEmpty" parameter states if an empty String should
* be allowed for parsing, i.e. get interpreted as null value.
* Otherwise, an IllegalArgumentException gets thrown in that case.
*
The "exactDateLength" parameter states that IllegalArgumentException gets
* thrown if the String does not exactly match the length specified. This is useful
* because SimpleDateFormat does not enforce strict parsing of the year part,
* not even with {@code setLenient(false)}. Without an "exactDateLength"
* specified, the "01/01/05" would get parsed to "01/01/0005". However, even
* with an "exactDateLength" specified, prepended zeros in the day or month
* part may still allow for a shorter year part, so consider this as just
* one more assertion that gets you closer to the intended date format.
*
* @param dateFormat the DateFormat to use for parsing and rendering
* @param allowEmpty if empty strings should be allowed
* @param exactDateLength the exact expected length of the date String
*/
public CustomDateEditor(DateFormat dateFormat, boolean allowEmpty, int exactDateLength) {
this.dateFormat = dateFormat;
this.allowEmpty = allowEmpty;
this.exactDateLength = exactDateLength;
}
/**
* Parse the Date from the given text, using the specified DateFormat.
*/
@Override
public void setAsText(@Nullable String text) throws IllegalArgumentException {
if (this.allowEmpty && StringUtils.isBlank(text)) {
// Treat empty String as null value.
setValue(null);
}
else if (text != null && this.exactDateLength >= 0 && text.length() != this.exactDateLength) {
throw new IllegalArgumentException(
"Could not parse date: it is not exactly" + this.exactDateLength + "characters long");
}
else {
try {
setValue(this.dateFormat.parse(text));
}
catch (ParseException ex) {
throw new IllegalArgumentException("Could not parse date: " + ex.getMessage(), ex);
}
}
}
/**
* Format the Date as String, using the specified DateFormat.
*/
@Override
public String getAsText() {
Date value = (Date) getValue();
return (value != null ? this.dateFormat.format(value) : "");
}
}