/*
* Copyright 1999,2004 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.taglibs.standard.lang.jpath.expression;
import javax.servlet.jsp.PageContext;
import org.apache.taglibs.standard.lang.jpath.adapter.ConversionException;
import org.apache.taglibs.standard.lang.jpath.adapter.Convert;
import org.apache.taglibs.standard.lang.jpath.adapter.GregorianCalendarAdapter;
import org.apache.taglibs.standard.lang.jpath.adapter.IterationContext;
import org.apache.taglibs.standard.lang.jpath.adapter.JSPDate;
/**
* The DateFunction class
*
*
* @author <a href='mailto:scott.hasse@isthmusgroup.com'>Scott Hasse</a>
* @version
*/
public class DateFunction extends SimpleNode {
/**
* Used to create an instance of the DateFunction class
*
*
* @param id
*
*/
public DateFunction(int id) {
super(id);
}
/**
* Used to create an instance of the DateFunction class
*
*
* @param p
* @param id
*
*/
public DateFunction(Parser p, int id) {
super(p, id);
}
/**
* Provides a method to print a normalized version of the original
* expression. The normalized version has standardized spacing and
* parenthesis, and can be used to compare expressions formatted
* in different ways to see if they are actually the same expression.
*
*
* @return The normalized version of the original expression
*
*/
public String toNormalizedString() {
boolean first = true;
String normalized;
normalized = "date(";
if (children != null) {
for (int i = 0; i < children.length; ++i) {
if (!first) {
normalized = normalized + ",";
}
first = false;
SimpleNode n = (SimpleNode) children[i];
if (n != null) {
normalized = normalized + n.toNormalizedString();
}
}
}
normalized = normalized + ")";
return normalized;
}
/**
* This method evaluates this node of the expression and all child nodes.
* It returns the result of the
* evaluation as an <tt>Object</tt>. If any problems are encountered
* during the evaluation, an <tt>EvaluationException</tt> is thrown.
*
*
* @param pageContext the current JSP PageContext
*
* @param icontext the Iteration Context of the expression. If there is
* no interation context, this should be null.
*
* @return the result of the expression evaluation as an object
*
* @throws EvaluationException if a problem is encountered during the
* evaluation
*/
public Object evaluate(PageContext pageContext, IterationContext icontext)
throws EvaluationException {
JSPDate d;
try {
if (jjtGetNumChildren() == 3) {
int year =
Convert.toDouble(jjtGetChild(0).evaluate(pageContext,
icontext)).intValue();
int month =
Convert.toDouble(jjtGetChild(1)
.evaluate(pageContext, icontext)).intValue() - 1;
int date =
Convert.toDouble(jjtGetChild(2).evaluate(pageContext,
icontext)).intValue();
d = new GregorianCalendarAdapter(year, month, date);
} else if (jjtGetNumChildren() == 5) {
int year =
Convert.toDouble(jjtGetChild(0).evaluate(pageContext,
icontext)).intValue();
int month =
Convert.toDouble(jjtGetChild(1)
.evaluate(pageContext, icontext)).intValue() - 1;
int date =
Convert.toDouble(jjtGetChild(2).evaluate(pageContext,
icontext)).intValue();
int hour =
Convert.toDouble(jjtGetChild(3).evaluate(pageContext,
icontext)).intValue();
int minute =
Convert.toDouble(jjtGetChild(4).evaluate(pageContext,
icontext)).intValue();
d = new GregorianCalendarAdapter(year, month, date, hour,
minute);
} else if (jjtGetNumChildren() == 6) {
int year =
Convert.toDouble(jjtGetChild(0).evaluate(pageContext,
icontext)).intValue();
int month =
Convert.toDouble(jjtGetChild(1)
.evaluate(pageContext, icontext)).intValue() - 1;
int date =
Convert.toDouble(jjtGetChild(2).evaluate(pageContext,
icontext)).intValue();
int hour =
Convert.toDouble(jjtGetChild(3).evaluate(pageContext,
icontext)).intValue();
int minute =
Convert.toDouble(jjtGetChild(4).evaluate(pageContext,
icontext)).intValue();
int second =
Convert.toDouble(jjtGetChild(5).evaluate(pageContext,
icontext)).intValue();
d = new GregorianCalendarAdapter(year, month, date, hour,
minute, second);
} else {
throw new EvaluationException(this,
"date does not have the proper"
+ "number of arguments");
}
} catch (ConversionException ce) {
throw new EvaluationException(this, ce.getMessage());
}
return d;
}
}