/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
//
/**
* @author Neeraj Joshi
*
*/
package org.apache.imperius.spl.parser.expressions.impl;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Logger;
import org.apache.imperius.spl.core.Expression;
import org.apache.imperius.spl.core.TypeConstants;
import org.apache.imperius.spl.core.TypeInfo;
import org.apache.imperius.spl.parser.exceptions.SPLException;
import org.apache.imperius.spl.parser.expressions.MultipleArgumentExpression;
import org.apache.imperius.spl.parser.expressions.NumericExpression;
import org.apache.imperius.spl.parser.util.ExpressionUtility;
import org.apache.imperius.spl.parser.util.TypeInfoImpl;
import org.apache.imperius.spl.parser.util.TypeResolver;
import org.apache.imperius.util.Messages;
import org.apache.imperius.util.SPLLogger;
/**
*
* @author Xiping Change Log: 1. 3/9/07: Neeraj Joshi: Changed constructor to
* take a list to facilitate reflection in the expression factory 2.
* 3/9/07: Neeraj Joshi: Changed the method in which the return type is
* determined
*
*/
public class Min extends MultipleArgumentExpression implements
NumericExpression
{
public static final String className = Min.class.getName();
private static Logger logger = SPLLogger.getSPLLogger().getLogger();
private static final String sourceClass="Min";
public Min(List exprList, boolean validateExpression)
throws SPLException
{
super(exprList);
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "Min");
if (validateExpression)
{
if (!validate())
{
logger.severe(Thread.currentThread().getName()+" "+"validation error: " + className
+ " has wrong data type passed in.");
throw new SPLException(Messages.getString(
"SPL_VALIDATION_ERROR_MSG", new Object[] { className }));
}
}
this._dataType.setIsArray(false);
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "Min");
}
public Object evaluate() throws SPLException
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "evaluate");
try
{
Iterator expIterator = this._expressions.iterator();
Number min = null;
while (expIterator.hasNext())
{
Expression exp = (Expression) expIterator.next();
Number evalResult = (Number) exp.evaluate();
if (min == null)
{
min = evalResult;
}
else
{
if (ExpressionUtility.compare(evalResult, min) < 0)
{
min = evalResult;
}
}
}
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "evaluate");
return min;
}
catch (Exception e)
{
logger.severe(Thread.currentThread().getName()+" "+"evaluation error: " + e.toString());
throw new SPLException(Messages.getString(
"SPL_EVALUATION_ERROR_MSG", new Object[] { e
.getLocalizedMessage() }));
}
}
public boolean validate() throws SPLException
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "validate");
Iterator expIterator = this._expressions.iterator();
TypeInfo currentDataType = new TypeInfoImpl();
while (expIterator.hasNext())
{
Expression exp = (Expression) expIterator.next();
TypeInfo type = exp.getType();
if (!TypeResolver.isNumeric(type))
{
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "validate");
return false;
}
if (currentDataType.getType() == TypeConstants.INVALID)
{
currentDataType = type;
}
_dataType = TypeResolver.binaryNumericPromotionResolver(
currentDataType, type);
}
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "validate");
return true;
}
public String toString()
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "toString");
String str = "MIN[ ";
Iterator iter = this._expressions.iterator();
while(iter.hasNext()) {
str = str + ((Expression)iter.next()).toString() + (iter.hasNext()?", ":" ]");
}
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "toString");
return str;
}
}