/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.convert;
import javax.faces.component.UIComponent;
import javax.faces.component.PartialStateHolder;
import javax.faces.context.FacesContext;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* <p><span class="changed_modified_2_0_rev_a">{@link Converter}</span>
* implementation for <code>java.util.Date</code> values.</p>
*
* <p>The <code>getAsObject()</code> method parses a String into a
* <code>java.util.Date</code>, according to the following algorithm:</p>
* <ul>
* <li>If the specified String is null, return
* a <code>null</code>. Otherwise, trim leading and trailing
* whitespace before proceeding.</li>
* <li>If the specified String - after trimming - has a zero length,
* return <code>null</code>.</li>
* <li>If the <code>locale</code> property is not null,
* use that <code>Locale</code> for managing parsing. Otherwise, use the
* <code>Locale</code> from the <code>UIViewRoot</code>.</li>
* <li>If a <code>pattern</code> has been specified, its syntax must conform
* the rules specified by <code>java.text.SimpleDateFormat</code>. Such
* a pattern will be used to parse, and the <code>type</code>,
* <code>dateStyle</code>, and <code>timeStyle</code> properties
* will be ignored.</li>
* <li>If a <code>pattern</code> has not been specified, parsing will be based
* on the <code>type</code> property, which expects a date value, a time
* value, or both. Any date and time values included will be parsed in
* accordance to the styles specified by <code>dateStyle</code> and
* <code>timeStyle</code>, respectively.</li>
* <li>If a <code>timezone</code> has been specified, it must be passed
* to the underlying <code>DateFormat</code> instance. Otherwise
* the "GMT" timezone is used.</li>
* <li>In all cases, parsing must be non-lenient; the given string must
* strictly adhere to the parsing format.</li>
* </ul>
* <p/>
* <p>The <code>getAsString()</code> method expects a value of type
* <code>java.util.Date</code> (or a subclass), and creates a formatted
* String according to the following algorithm:</p>
* <ul>
* <li>If the specified value is null, return a zero-length String.</li>
* <li>If the specified value is a String, return it unmodified.</li>
* <li>If the <code>locale</code> property is not null,
* use that <code>Locale</code> for managing formatting. Otherwise, use the
* <code>Locale</code> from the <code>UIViewRoot</code>.</li>
* <li>If a <code>timezone</code> has been specified, it must be passed
* to the underlying <code>DateFormat</code> instance. Otherwise
* the "GMT" timezone is used.</li>
* <li>If a <code>pattern</code> has been specified, its syntax must conform
* the rules specified by <code>java.text.SimpleDateFormat</code>. Such
* a pattern will be used to format, and the <code>type</code>,
* <code>dateStyle</code>, and <code>timeStyle</code> properties
* will be ignored.</li>
* <li>If a <code>pattern</code> has not been specified, formatting will be
* based on the <code>type</code> property, which includes a date value,
* a time value, or both into the formatted String. Any date and time
* values included will be formatted in accordance to the styles specified
* by <code>dateStyle</code> and <code>timeStyle</code>, respectively.</li>
* </ul>
*/
public class DateTimeConverter implements Converter, PartialStateHolder {
// ------------------------------------------------------ Manifest Constants
/**
* <p>The standard converter id for this converter.</p>
*/
public static final String CONVERTER_ID = "javax.faces.DateTime";
/**
* <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
* the conversion to <code>Date</code> fails. The message format
* string for this message may optionally include the following
* placeholders:
* <ul>
* <li><code>{0}</code> replaced by the unconverted value.</li>
* <li><code>{1}</code> replaced by an example value.</li>
* <li><code>{2}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final String DATE_ID =
"javax.faces.converter.DateTimeConverter.DATE";
/**
* <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
* the conversion to <code>Time</code> fails. The message format
* string for this message may optionally include the following
* placeholders:
* <ul>
* <li><code>{0}</code> replaced by the unconverted value.</li>
* <li><code>{1}</code> replaced by an example value.</li>
* <li><code>{2}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final String TIME_ID =
"javax.faces.converter.DateTimeConverter.TIME";
/**
* <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
* the conversion to <code>DateTime</code> fails. The message format
* string for this message may optionally include the following
* placeholders:
* <ul>
* <li><code>{0}</code> replaced by the unconverted value.</li>
* <li><code>{1}</code> replaced by an example value.</li>
* <li><code>{2}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final String DATETIME_ID =
"javax.faces.converter.DateTimeConverter.DATETIME";
/**
* <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
* the conversion of the <code>DateTime</code> value to
* <code>String</code> fails. The message format string for this message
* may optionally include the following placeholders:
* <ul>
* <li><code>{0}</code> relaced by the unconverted value.</li>
* <li><code>{1}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final String STRING_ID =
"javax.faces.converter.STRING";
private static final TimeZone DEFAULT_TIME_ZONE = TimeZone.getTimeZone("GMT");
// ------------------------------------------------------ Instance Variables
private String dateStyle = "default";
private Locale locale = null;
private String pattern = null;
private String timeStyle = "default";
private TimeZone timeZone = DEFAULT_TIME_ZONE;
private String type = "date";
// -------------------------------------------------------------- Properties
/**
* <p>Return the style to be used to format or parse dates. If not set,
* the default value, <code>default</code>, is returned.</p>
*/
public String getDateStyle() {
return (this.dateStyle);
}
/**
* <p>Set the style to be used to format or parse dates. Valid values
* are <code>default</code>, <code>short</code>, <code>medium</code>,
* <code>long</code>, and <code>full</code>.
* An invalid value will cause a {@link ConverterException} when
* <code>getAsObject()</code> or <code>getAsString()</code> is called.</p>
*
* @param dateStyle The new style code
*/
public void setDateStyle(String dateStyle) {
clearInitialState();
this.dateStyle = dateStyle;
}
/**
* <p>Return the <code>Locale</code> to be used when parsing or formatting
* dates and times. If not explicitly set, the <code>Locale</code> stored
* in the {@link javax.faces.component.UIViewRoot} for the current
* request is returned.</p>
*/
public Locale getLocale() {
if (this.locale == null) {
this.locale =
getLocale(FacesContext.getCurrentInstance());
}
return (this.locale);
}
/**
* <p>Set the <code>Locale</code> to be used when parsing or formatting
* dates and times. If set to <code>null</code>, the <code>Locale</code>
* stored in the {@link javax.faces.component.UIViewRoot} for the current
* request will be utilized.</p>
*
* @param locale The new <code>Locale</code> (or <code>null</code>)
*/
public void setLocale(Locale locale) {
clearInitialState();
this.locale = locale;
}
/**
* <p>Return the format pattern to be used when formatting and
* parsing dates and times.</p>
*/
public String getPattern() {
return (this.pattern);
}
/**
* <p>Set the format pattern to be used when formatting and parsing
* dates and times. Valid values are those supported by
* <code>java.text.SimpleDateFormat</code>.
* An invalid value will cause a {@link ConverterException} when
* <code>getAsObject()</code> or <code>getAsString()</code> is called.</p>
*
* @param pattern The new format pattern
*/
public void setPattern(String pattern) {
clearInitialState();
this.pattern = pattern;
}
/**
* <p>Return the style to be used to format or parse times. If not set,
* the default value, <code>default</code>, is returned.</p>
*/
public String getTimeStyle() {
return (this.timeStyle);
}
/**
* <p>Set the style to be used to format or parse times. Valid values
* are <code>default</code>, <code>short</code>, <code>medium</code>,
* <code>long</code>, and <code>full</code>.
* An invalid value will cause a {@link ConverterException} when
* <code>getAsObject()</code> or <code>getAsString()</code> is called.</p>
*
* @param timeStyle The new style code
*/
public void setTimeStyle(String timeStyle) {
clearInitialState();
this.timeStyle = timeStyle;
}
/**
* <p>Return the <code>TimeZone</code> used to interpret a time value.
* If not explicitly set, the default time zone of <code>GMT</code>
* returned.</p>
*/
public TimeZone getTimeZone() {
return (this.timeZone);
}
/**
* <p>Set the <code>TimeZone</code> used to interpret a time value.</p>
*
* @param timeZone The new time zone
*/
public void setTimeZone(TimeZone timeZone) {
clearInitialState();
this.timeZone = timeZone;
}
/**
* <p>Return the type of value to be formatted or parsed.
* If not explicitly set, the default type, <code>date</code>
* is returned.</p>
*/
public String getType() {
return (this.type);
}
/**
* <p>Set the type of value to be formatted or parsed.
* Valid values are <code>both</code>, <code>date</code>, or
* <code>time</code>.
* An invalid value will cause a {@link ConverterException} when
* <code>getAsObject()</code> or <code>getAsString()</code> is called.</p>
*
* @param type The new date style
*/
public void setType(String type) {
clearInitialState();
this.type = type;
}
// ------------------------------------------------------- Converter Methods
/**
* @throws ConverterException {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
*/
public Object getAsObject(FacesContext context, UIComponent component,
String value) {
if (context == null || component == null) {
throw new NullPointerException();
}
Object returnValue = null;
DateFormat parser = null;
try {
// 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);
}
// Identify the Locale to use for parsing
Locale locale = getLocale(context);
// Create and configure the parser to be used
parser = getDateFormat(locale);
if (null != timeZone) {
parser.setTimeZone(timeZone);
}
// Perform the requested parsing
returnValue = parser.parse(value);
} catch (ParseException e) {
if ("date".equals(type)) {
throw new ConverterException(MessageFactory.getMessage(
context, DATE_ID, value,
parser.format(new Date(System.currentTimeMillis())),
MessageFactory.getLabel(context, component)), e);
} else if ("time".equals(type)) {
throw new ConverterException(MessageFactory.getMessage(
context, TIME_ID, value,
parser.format(new Date(System.currentTimeMillis())),
MessageFactory.getLabel(context, component)), e);
} else if ("both".equals(type)) {
throw new ConverterException(MessageFactory.getMessage(
context, DATETIME_ID, value,
parser.format(new Date(System.currentTimeMillis())),
MessageFactory.getLabel(context, component)), e);
}
} catch (Exception e) {
throw new ConverterException(e);
}
return returnValue;
}
/**
* @throws ConverterException {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
*/
public String getAsString(FacesContext context, UIComponent component,
Object value) {
if (context == null || component == null) {
throw new NullPointerException();
}
try {
// If the specified value is null, return a zero-length String
if (value == null) {
return "";
}
// If the incoming value is still a string, play nice
// and return the value unmodified
if (value instanceof String) {
return (String) value;
}
// Identify the Locale to use for formatting
Locale locale = getLocale(context);
// Create and configure the formatter to be used
DateFormat formatter = getDateFormat(locale);
if (null != timeZone) {
formatter.setTimeZone(timeZone);
}
// Perform the requested formatting
return (formatter.format(value));
} catch (ConverterException e) {
throw new ConverterException(MessageFactory.getMessage(
context, STRING_ID, value,
MessageFactory.getLabel(context, component)), e);
} catch (Exception e) {
throw new ConverterException(MessageFactory.getMessage(
context, STRING_ID, value,
MessageFactory.getLabel(context, component)), e);
}
}
// --------------------------------------------------------- Private Methods
/**
* <p>Return a <code>DateFormat</code> instance to use for formatting
* and parsing in this {@link Converter}.</p>
*
* @param locale The <code>Locale</code> used to select formatting
* and parsing conventions
* @throws ConverterException if no instance can be created
*/
private DateFormat getDateFormat(Locale locale) {
// PENDING(craigmcc) - Implement pooling if needed for performance?
if (pattern == null && type == null) {
throw new IllegalArgumentException("Either pattern or type must" +
" be specified.");
}
DateFormat df;
if (pattern != null) {
df = new SimpleDateFormat(pattern, locale);
} else if (type.equals("both")) {
df = DateFormat.getDateTimeInstance
(getStyle(dateStyle), getStyle(timeStyle), locale);
} else if (type.equals("date")) {
df = DateFormat.getDateInstance(getStyle(dateStyle), locale);
} else if (type.equals("time")) {
df = DateFormat.getTimeInstance(getStyle(timeStyle), locale);
} else {
// PENDING(craigmcc) - i18n
throw new IllegalArgumentException("Invalid type: " + type);
}
df.setLenient(false);
return (df);
}
/**
* <p>Return the <code>Locale</code> we will use for localizing our
* formatting and parsing processing.</p>
*
* @param context The {@link FacesContext} for the current request
*/
private Locale getLocale(FacesContext context) {
// PENDING(craigmcc) - JSTL localization context?
Locale locale = this.locale;
if (locale == null) {
locale = context.getViewRoot().getLocale();
}
return (locale);
}
/**
* <p>Return the style constant for the specified style name.</p>
*
* @param name Name of the style for which to return a constant
* @throws ConverterException if the style name is not valid
*/
private static int getStyle(String name) {
if ("default".equals(name)) {
return (DateFormat.DEFAULT);
} else if ("short".equals(name)) {
return (DateFormat.SHORT);
} else if ("medium".equals(name)) {
return (DateFormat.MEDIUM);
} else if ("long".equals(name)) {
return (DateFormat.LONG);
} else if ("full".equals(name)) {
return (DateFormat.FULL);
} else {
// PENDING(craigmcc) - i18n
throw new ConverterException("Invalid style '" + name + '\'');
}
}
// ----------------------------------------------------- StateHolder Methods
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!initialStateMarked()) {
Object values[] = new Object[6];
values[0] = dateStyle;
values[1] = locale;
values[2] = pattern;
values[3] = timeStyle;
values[4] = timeZone;
values[5] = type;
return (values);
}
return null;
}
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state != null) {
Object values[] = (Object[]) state;
dateStyle = (String) values[0];
locale = (Locale) values[1];
pattern = (String) values[2];
timeStyle = (String) values[3];
timeZone = (TimeZone) values[4];
type = (String) values[5];
}
}
private boolean transientFlag = false;
public boolean isTransient() {
return (transientFlag);
}
public void setTransient(boolean transientFlag) {
this.transientFlag = transientFlag;
}
private boolean initialState;
public void markInitialState() {
initialState = true;
}
public boolean initialStateMarked() {
return initialState;
}
public void clearInitialState() {
initialState = false;
}
}