/*
* @(#)$Id: MultiplicativeExpr.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.expr.math;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.meta.*;
import xbird.xquery.operator.OverloadedFunction;
import xbird.xquery.operator.math.*;
import xbird.xquery.parser.XQueryParserVisitor;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class MultiplicativeExpr extends ArithmeticExpr {
private static final long serialVersionUID = -2862919029919882029L;
public static final String MULTIPLY = "*";
public static final String DIV = "div";
public static final String IDIV = "idiv";
public static final String MOD = "mod";
private final String operator;
private OverloadedFunction _op = null;
public MultiplicativeExpr(String operator, XQExpression leftOperand, XQExpression rightOperand) {
super(leftOperand, rightOperand);
this.operator = operator;
}
public XQExpression visit(XQueryParserVisitor visitor, XQueryContext ctxt)
throws XQueryException {
return visitor.visit(this, ctxt);
}
public String getOperator() {
return operator;
}
@Override
public XQExpression staticAnalysis(StaticContext statEnv) throws XQueryException {
super.staticAnalysis(statEnv);
OverloadedFunction op = resolveOp();
op.staticAnalysis(statEnv, _leftOperand, _rightOperand);
this._op = op;
this._type = op.getReturnType();
return this;
}
private OverloadedFunction resolveOp() {
if(MULTIPLY.equals(operator)) {
return new TimesOp();
} else if(DIV.equals(operator)) {
return new DivOp();
} else if(IDIV.equals(operator)) {
return new IdivOp();
} else if(MOD.equals(operator)) {
return new ModOp();
} else {
throw new IllegalStateException("Invalid operator: " + operator);
}
}
public Sequence<? extends Item> eval(Sequence<? extends Item> contextSeq, DynamicContext dynEnv)
throws XQueryException {
if(!_analyzed) {
_analyzed = false;
}
final Item v1 = _leftOperand.evalAsItem(contextSeq, dynEnv, true);
if(v1 == null) {
return ValueSequence.EMPTY_SEQUENCE;
}
final Item v2 = _rightOperand.evalAsItem(contextSeq, dynEnv, true);
if(v2 == null) {
return ValueSequence.EMPTY_SEQUENCE;
}
Sequence res = _op.eval(dynEnv, v1, v2);
return res;
}
}