/**
* 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.ambari.server.api.predicate.operators;
/**
* Base operator implementation.
*/
public abstract class AbstractOperator implements Operator {
/**
* The precedence value for the current context.
*/
private final int m_ctxPrecedence;
/**
* Constructor.
*
* @param ctxPrecedence the context precedence value
*/
protected AbstractOperator(int ctxPrecedence) {
m_ctxPrecedence = ctxPrecedence;
}
/**
* Return the base precedence for this operator.
* This is the value that is specific to the operator
* type and doesn't take context into account.
*
* @return the base precedence for this operator type
*/
public int getBasePrecedence() {
// this value is used for all relational operators
// logical operators override this value
return -1;
}
@Override
public int getPrecedence() {
return getBasePrecedence() + m_ctxPrecedence;
}
@Override
public String toString() {
return getName();
}
/**
* Get the name of the operator.
*
* @return the operator name
*/
public abstract String getName();
}