/*
* 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.type;
import com.facebook.presto.spi.function.IsNull;
import com.facebook.presto.spi.function.LiteralParameters;
import com.facebook.presto.spi.function.ScalarOperator;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.type.StandardTypes;
import io.airlift.slice.Slice;
import io.airlift.slice.XxHash64;
import static com.facebook.presto.spi.function.OperatorType.BETWEEN;
import static com.facebook.presto.spi.function.OperatorType.EQUAL;
import static com.facebook.presto.spi.function.OperatorType.GREATER_THAN;
import static com.facebook.presto.spi.function.OperatorType.GREATER_THAN_OR_EQUAL;
import static com.facebook.presto.spi.function.OperatorType.HASH_CODE;
import static com.facebook.presto.spi.function.OperatorType.IS_DISTINCT_FROM;
import static com.facebook.presto.spi.function.OperatorType.LESS_THAN;
import static com.facebook.presto.spi.function.OperatorType.LESS_THAN_OR_EQUAL;
import static com.facebook.presto.spi.function.OperatorType.NOT_EQUAL;
import static com.facebook.presto.spi.type.Chars.compareChars;
public final class CharOperators
{
private CharOperators() {}
@LiteralParameters({"x"})
@ScalarOperator(EQUAL)
@SqlType(StandardTypes.BOOLEAN)
public static boolean equal(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return left.equals(right);
}
@LiteralParameters({"x"})
@ScalarOperator(NOT_EQUAL)
@SqlType(StandardTypes.BOOLEAN)
public static boolean notEqual(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return !left.equals(right);
}
@LiteralParameters({"x"})
@ScalarOperator(LESS_THAN)
@SqlType(StandardTypes.BOOLEAN)
public static boolean lessThan(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return compareChars(left, right) < 0;
}
@LiteralParameters({"x"})
@ScalarOperator(LESS_THAN_OR_EQUAL)
@SqlType(StandardTypes.BOOLEAN)
public static boolean lessThanOrEqual(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return compareChars(left, right) <= 0;
}
@LiteralParameters({"x"})
@ScalarOperator(GREATER_THAN)
@SqlType(StandardTypes.BOOLEAN)
public static boolean greaterThan(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return compareChars(left, right) > 0;
}
@LiteralParameters({"x"})
@ScalarOperator(GREATER_THAN_OR_EQUAL)
@SqlType(StandardTypes.BOOLEAN)
public static boolean greaterThanOrEqual(@SqlType("char(x)") Slice left, @SqlType("char(x)") Slice right)
{
return compareChars(left, right) >= 0;
}
@LiteralParameters({"x"})
@ScalarOperator(BETWEEN)
@SqlType(StandardTypes.BOOLEAN)
public static boolean between(@SqlType("char(x)") Slice value, @SqlType("char(x)") Slice min, @SqlType("char(x)") Slice max)
{
return compareChars(min, value) <= 0 && compareChars(value, max) <= 0;
}
@LiteralParameters("x")
@ScalarOperator(HASH_CODE)
@SqlType(StandardTypes.BIGINT)
public static long hashCode(@SqlType("char(x)") Slice value)
{
return XxHash64.hash(value);
}
@LiteralParameters({"x"})
@ScalarOperator(IS_DISTINCT_FROM)
@SqlType(StandardTypes.BOOLEAN)
public static boolean isDistinctFrom(
@SqlType("char(x)") Slice left,
@IsNull boolean leftNull,
@SqlType("char(x)") Slice right,
@IsNull boolean rightNull)
{
if (leftNull != rightNull) {
return true;
}
if (leftNull) {
return false;
}
return notEqual(left, right);
}
}