/*
* 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 Xiping Wang
* @modified Neeraj Joshi
*
*/
package org.apache.imperius.spl.parser.expressions.impl;
import java.util.List;
import java.util.logging.Logger;
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.NumericExpression;
import org.apache.imperius.spl.parser.expressions.SingleArgumentExpression;
import org.apache.imperius.spl.parser.util.TypeResolver;
import org.apache.imperius.util.Messages;
import org.apache.imperius.util.SPLLogger;
public class Log10 extends SingleArgumentExpression implements
NumericExpression
{
public static final String className = Log10.class.getName();
private static Logger logger = SPLLogger.getSPLLogger().getLogger();
private static final String sourceClass="Log10";
public Log10(List exprList, boolean validateExpression)
throws SPLException
{
super(exprList);
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "Log10");
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 }));
}
}
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "Log10");
}
public Object evaluate() throws SPLException
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "evaluate");
try
{
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "evaluate");
return log((Number) _exp.evaluate());
}
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 static Number log(Number o)
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "log");
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "log");
return new Double(Math.log(o.doubleValue()) / Math.log(10));
}
public boolean validate() throws SPLException
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "validate");
TypeInfo eType = _exp.getType();
if (!eType.getIsArray() && TypeResolver.isNumeric(eType))
{
_dataType.setType(TypeConstants.doubleType);
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "validate");
return true;
}
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "validate");
return false;
}
public String toString()
{
logger.entering(sourceClass,Thread.currentThread().getName()+" "+ "toString");
String str = "Log10(" + this._exp.toString() + ")";
logger.exiting(sourceClass,Thread.currentThread().getName()+" "+ "toString");
return str;
}
}