/**
* Copyright 2006 Webmedia Group Ltd.
*
* 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.araneaframework.backend.list.memorybased.compexpr;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.log4j.Logger;
import org.araneaframework.backend.list.memorybased.ComparatorExpression;
import org.araneaframework.backend.list.memorybased.ExpressionEvaluationException;
import org.araneaframework.backend.list.memorybased.expression.VariableResolver;
public class MultiComparatorExpression implements CompositeComparatorExpression {
private static final long serialVersionUID = 1L;
private static final Logger log = Logger.getLogger(MultiComparatorExpression.class);
protected List children = new ArrayList();
public ComparatorExpression add(ComparatorExpression expression) {
this.children.add(expression);
return this;
}
public ComparatorExpression[] getChildren() {
return (ComparatorExpression[]) this.children
.toArray(new ComparatorExpression[this.children.size()]);
}
public int compare(VariableResolver resolver1, VariableResolver resolver2)
throws ExpressionEvaluationException {
if (this.children.size() == 0) {
log.debug("No children specified - returning zero as the comparing result");
return 0;
}
int result = 0;
for (Iterator i = this.children.iterator(); i.hasNext();) {
ComparatorExpression expr = (ComparatorExpression) i.next();
result = expr.compare(resolver1, resolver2);
if (result == 0) {
return 0;
}
}
return result;
}
}