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/*
*
* 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.
*
*/
package org.apache.qpid.qmf2.common;
// Misc Imports
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/*
* This class represents the base class for all Logical Expressions (and, or, not) created by expanding the Query predicate.
*
* @author Fraser Adams
*/
public abstract class LogicalExpression extends Expression
{
protected List<Expression> _subExpressions = new ArrayList<Expression>();
/**
* Constructor. This method iterates through collecting the sub-expressions of the Logical Expression
*
* @param expr the List of sub-expressions extracted by parsing the Query predicate, the first one should be
* the Logical Expression's operator name
*/
public LogicalExpression(final List expr) throws QmfException
{
Iterator iter = expr.listIterator();
String op = (String)iter.next();
//System.out.println("LogicalExpression, op = " + op);
// Collect sub-expressions
while (iter.hasNext())
{
Object object = iter.next();
if (object instanceof List)
{
_subExpressions.add(createExpression((List)object));
}
else
{
throw new QmfException("Operands of " + op + " must be Lists");
}
}
}
}
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