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org.apache.flink.table.planner.expressions.ExpressionBuilder Maven / Gradle / Ivy
/*
* 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.flink.table.planner.expressions;
import org.apache.flink.table.expressions.ApiExpressionUtils;
import org.apache.flink.table.expressions.Expression;
import org.apache.flink.table.expressions.TypeLiteralExpression;
import org.apache.flink.table.expressions.UnresolvedCallExpression;
import org.apache.flink.table.expressions.ValueLiteralExpression;
import org.apache.flink.table.functions.FunctionDefinition;
import org.apache.flink.table.types.DataType;
import java.util.List;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.AND;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.CAST;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.CONCAT;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.DIVIDE;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.EQUALS;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.GREATER_THAN;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.IF;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.IS_NULL;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.LESS_THAN;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.MINUS;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.MOD;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.NOT;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.OR;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.PLUS;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.REINTERPRET_CAST;
import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.TIMES;
/** Builder for {@link Expression}s. */
public class ExpressionBuilder {
public static ValueLiteralExpression nullOf(DataType type) {
return literal(null, type);
}
public static ValueLiteralExpression literal(Object value) {
return ApiExpressionUtils.valueLiteral(value);
}
public static ValueLiteralExpression literal(Object value, DataType type) {
if (value != null) {
return ApiExpressionUtils.valueLiteral(value, type.notNull());
} else {
return ApiExpressionUtils.valueLiteral(null, type.nullable());
}
}
public static UnresolvedCallExpression call(
FunctionDefinition functionDefinition, Expression... args) {
return ApiExpressionUtils.unresolvedCall(functionDefinition, args);
}
public static UnresolvedCallExpression call(
FunctionDefinition functionDefinition, List args) {
return ApiExpressionUtils.unresolvedCall(
functionDefinition, args.toArray(new Expression[0]));
}
public static UnresolvedCallExpression and(Expression arg1, Expression arg2) {
return call(AND, arg1, arg2);
}
public static UnresolvedCallExpression or(Expression arg1, Expression arg2) {
return call(OR, arg1, arg2);
}
public static UnresolvedCallExpression not(Expression arg) {
return call(NOT, arg);
}
public static UnresolvedCallExpression isNull(Expression input) {
return call(IS_NULL, input);
}
public static UnresolvedCallExpression ifThenElse(
Expression condition, Expression ifTrue, Expression ifFalse) {
return call(IF, condition, ifTrue, ifFalse);
}
public static UnresolvedCallExpression plus(Expression input1, Expression input2) {
return call(PLUS, input1, input2);
}
public static UnresolvedCallExpression minus(Expression input1, Expression input2) {
return call(MINUS, input1, input2);
}
public static UnresolvedCallExpression div(Expression input1, Expression input2) {
return call(DIVIDE, input1, input2);
}
public static UnresolvedCallExpression times(Expression input1, Expression input2) {
return call(TIMES, input1, input2);
}
public static UnresolvedCallExpression mod(Expression input1, Expression input2) {
return call(MOD, input1, input2);
}
public static UnresolvedCallExpression equalTo(Expression input1, Expression input2) {
return call(EQUALS, input1, input2);
}
public static UnresolvedCallExpression lessThan(Expression input1, Expression input2) {
return call(LESS_THAN, input1, input2);
}
public static UnresolvedCallExpression greaterThan(Expression input1, Expression input2) {
return call(GREATER_THAN, input1, input2);
}
public static UnresolvedCallExpression cast(Expression child, Expression type) {
return call(CAST, child, type);
}
public static UnresolvedCallExpression reinterpretCast(
Expression child, Expression type, boolean checkOverflow) {
return call(REINTERPRET_CAST, child, type, literal(checkOverflow));
}
public static TypeLiteralExpression typeLiteral(DataType type) {
return ApiExpressionUtils.typeLiteral(type);
}
public static UnresolvedCallExpression concat(Expression input1, Expression input2) {
return call(CONCAT, input1, input2);
}
}