/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.translator.yahoo;
import java.util.*;
import org.teiid.language.*;
import org.teiid.language.visitor.HierarchyVisitor;
import org.teiid.translator.TranslatorException;
/**
*/
public class TickerCollectorVisitor extends HierarchyVisitor {
private Set tickers = new HashSet();
private TranslatorException exception;
/**
*
*/
public TickerCollectorVisitor() {
super();
}
public void reset() {
tickers = new HashSet();
}
public Set getTickers() {
return this.tickers;
}
public TranslatorException getException() {
return this.exception;
}
public void visit(Comparison obj) {
Expression expr = obj.getRightExpression();
addTickerFromExpression(expr);
}
public void visit(In obj) {
List exprs = obj.getRightExpressions();
Iterator iter = exprs.iterator();
while(iter.hasNext()) {
Expression expr = (Expression) iter.next();
addTickerFromExpression(expr);
}
}
private void addTickerFromExpression(Expression expr) {
if(expr instanceof Literal) {
Literal literal = (Literal) expr;
if(literal.getType() == String.class) {
String ticker = (String) literal.getValue();
this.tickers.add(ticker.toUpperCase());
} else {
this.exception = new TranslatorException(YahooPlugin.Util.getString("TickerCollectorVisitor.Unexpected_type", literal.getType().getName())); //$NON-NLS-1$
}
} else {
this.exception = new TranslatorException(YahooPlugin.Util.getString("TickerCollectorVisitor.Unexpected_expression", expr)); //$NON-NLS-1$
}
}
public static Set getTickers(Condition crit) throws TranslatorException {
TickerCollectorVisitor visitor = new TickerCollectorVisitor();
crit.acceptVisitor(visitor);
if(visitor.getException() != null) {
throw visitor.getException();
}
return visitor.getTickers();
}
}