/*
* 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 com.facebook.presto.sql.tree;
public enum ComparisonExpressionType
{
EQUAL("="),
NOT_EQUAL("<>"),
LESS_THAN("<"),
LESS_THAN_OR_EQUAL("<="),
GREATER_THAN(">"),
GREATER_THAN_OR_EQUAL(">="),
IS_DISTINCT_FROM("IS DISTINCT FROM");
private final String value;
ComparisonExpressionType(String value)
{
this.value = value;
}
public String getValue()
{
return value;
}
public ComparisonExpressionType flip()
{
switch (this) {
case EQUAL:
return EQUAL;
case NOT_EQUAL:
return NOT_EQUAL;
case LESS_THAN:
return GREATER_THAN;
case LESS_THAN_OR_EQUAL:
return GREATER_THAN_OR_EQUAL;
case GREATER_THAN:
return LESS_THAN;
case GREATER_THAN_OR_EQUAL:
return LESS_THAN_OR_EQUAL;
case IS_DISTINCT_FROM:
return IS_DISTINCT_FROM;
default:
throw new IllegalArgumentException("Unsupported comparison: " + this);
}
}
public ComparisonExpressionType negate()
{
switch (this) {
case EQUAL:
return NOT_EQUAL;
case NOT_EQUAL:
return EQUAL;
case LESS_THAN:
return GREATER_THAN_OR_EQUAL;
case LESS_THAN_OR_EQUAL:
return GREATER_THAN;
case GREATER_THAN:
return LESS_THAN_OR_EQUAL;
case GREATER_THAN_OR_EQUAL:
return LESS_THAN;
default:
throw new IllegalArgumentException("Unsupported comparison: " + this);
}
}
}