// Copyright 2004, 2005 The Apache Software Foundation
//
// 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.apache.tapestry.form;
import java.text.DateFormatSymbols;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import org.apache.hivemind.HiveMind;
import org.apache.hivemind.Resource;
import org.apache.tapestry.IAsset;
import org.apache.tapestry.IForm;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.IScript;
import org.apache.tapestry.PageRenderSupport;
import org.apache.tapestry.TapestryUtils;
import org.apache.tapestry.engine.IScriptSource;
/**
* Provides a Form <tt>java.util.Date</tt> field component for selecting dates. [ <a
* href="../../../../../ComponentReference/DatePicker.html">Component Reference </a>]
*
* @author Paul Geerts
* @author Malcolm Edgar
* @since 2.2
*/
public abstract class DatePicker extends AbstractFormComponent
{
public abstract String getFormat();
public abstract Date getValue();
public abstract void setValue(Date value);
public abstract boolean isDisabled();
public abstract boolean getIncludeWeek();
public abstract IAsset getIcon();
private IScript _script;
private static final String SYM_NAME = "name";
private static final String SYM_FORMNAME = "formName";
private static final String SYM_MONTHNAMES = "monthNames";
private static final String SYM_SHORT_MONTHNAMES = "shortMonthNames";
private static final String SYM_WEEKDAYNAMES = "weekDayNames";
private static final String SYM_SHORT_WEEKDAYNAMES = "shortWeekDayNames";
private static final String SYM_FIRSTDAYINWEEK = "firstDayInWeek";
private static final String SYM_MINDAYSINFIRSTWEEK = "minimalDaysInFirstWeek";
private static final String SYM_FORMAT = "format";
private static final String SYM_INCL_WEEK = "includeWeek";
private static final String SYM_VALUE = "value";
private static final String SYM_BUTTONONCLICKHANDLER = "buttonOnclickHandler";
// Output symbol
private static final String SYM_BUTTONNAME = "buttonName";
/**
* Injected
*
* @since 4.0
*/
public abstract IScriptSource getScriptSource();
protected void finishLoad()
{
IScriptSource source = getScriptSource();
Resource location = getSpecification().getSpecificationLocation().getRelativeResource(
"DatePicker.script");
_script = source.getScript(location);
}
protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
{
IForm form = getForm(cycle);
if (form.wasPrerendered(writer, this))
return;
String name = form.getElementId(this);
String format = getFormat();
if (format == null)
format = "dd MMM yyyy";
SimpleDateFormat formatter = new SimpleDateFormat(format, getPage().getLocale());
boolean disabled = isDisabled();
if (!cycle.isRewinding())
{
PageRenderSupport pageRenderSupport = TapestryUtils.getPageRenderSupport(cycle, this);
Locale locale = getPage().getLocale();
DateFormatSymbols dfs = new DateFormatSymbols(locale);
Calendar cal = Calendar.getInstance(locale);
Date value = getValue();
Map symbols = new HashMap();
symbols.put(SYM_NAME, name);
symbols.put(SYM_FORMAT, format);
symbols.put(SYM_INCL_WEEK, getIncludeWeek() ? Boolean.TRUE : Boolean.FALSE);
symbols.put(SYM_MONTHNAMES, makeStringList(dfs.getMonths(), 0, 12));
symbols.put(SYM_SHORT_MONTHNAMES, makeStringList(dfs.getShortMonths(), 0, 12));
symbols.put(SYM_WEEKDAYNAMES, makeStringList(dfs.getWeekdays(), 1, 8));
symbols.put(SYM_SHORT_WEEKDAYNAMES, makeStringList(dfs.getShortWeekdays(), 1, 8));
symbols.put(SYM_FIRSTDAYINWEEK, new Integer(cal.getFirstDayOfWeek() - 1));
symbols.put(SYM_MINDAYSINFIRSTWEEK, new Integer(cal.getMinimalDaysInFirstWeek()));
symbols.put(SYM_FORMNAME, form.getName());
symbols.put(SYM_VALUE, value);
_script.execute(cycle, pageRenderSupport, symbols);
writer.beginEmpty("input");
writer.attribute("type", "text");
writer.attribute("name", name);
writer.attribute("title", formatter.toLocalizedPattern());
if (value != null)
writer.attribute("value", formatter.format(value));
if (disabled)
writer.attribute("disabled", "disabled");
renderInformalParameters(writer, cycle);
writer.printRaw(" ");
if (!disabled)
{
writer.begin("a");
writer.attribute("href", (String) symbols.get(SYM_BUTTONONCLICKHANDLER));
}
IAsset icon = getIcon();
writer.beginEmpty("img");
writer.attribute("src", icon.buildURL(cycle));
writer.attribute("border", 0);
if (!disabled)
writer.end(); // <a>
}
if (form.isRewinding())
{
if (disabled)
return;
String textValue = cycle.getParameter(name);
if (HiveMind.isBlank(textValue))
return;
try
{
Date value = formatter.parse(textValue);
setValue(value);
}
catch (ParseException ex)
{
}
}
}
/**
* Create a list of quoted strings. The list is suitable for initializing a JavaScript array.
*/
private String makeStringList(String[] a, int offset, int length)
{
StringBuffer b = new StringBuffer();
for (int i = offset; i < length; i++)
{
// JavaScript is sensitive to some UNICODE characters. So for
// the sake of simplicity, we just escape everything
b.append('"');
char[] ch = a[i].toCharArray();
for (int j = 0; j < ch.length; j++)
{
if (ch[j] < 128)
{
b.append(ch[j]);
}
else
{
b.append(escape(ch[j]));
}
}
b.append('"');
if (i < length - 1)
{
b.append(", ");
}
}
return b.toString();
}
/**
* Create an escaped Unicode character
*
* @param c
* @return The unicode character in escaped string form
*/
private static String escape(char c)
{
StringBuffer b = new StringBuffer();
for (int i = 0; i < 4; i++)
{
b.append(Integer.toHexString(c & 0x000F).toUpperCase());
c >>>= 4;
}
b.append("u\\");
return b.reverse().toString();
}
}