org.mybatis.dynamic.sql.select.function.AbstractMultipleColumnArithmeticFunction Maven / Gradle / Ivy
/**
* Copyright 2016-2018 the original author or authors.
*
* 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 org.mybatis.dynamic.sql.select.function;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.mybatis.dynamic.sql.BasicColumn;
import org.mybatis.dynamic.sql.BindableColumn;
import org.mybatis.dynamic.sql.render.TableAliasCalculator;
public abstract class AbstractMultipleColumnArithmeticFunction>
extends AbstractFunction> {
protected BasicColumn secondColumn;
protected List subsequentColumns = new ArrayList<>();
protected AbstractMultipleColumnArithmeticFunction(BindableColumn firstColumn, BasicColumn secondColumn,
List subsequentColumns) {
super(firstColumn);
this.secondColumn = Objects.requireNonNull(secondColumn);
this.subsequentColumns.addAll(subsequentColumns);
}
@Override
public String renderWithTableAlias(TableAliasCalculator tableAliasCalculator) {
// note - the cast below is added for a type inference bug in the Java9 compiler.
return Stream.of(Stream.of((BasicColumn) column), Stream.of(secondColumn), subsequentColumns.stream())
.flatMap(Function.identity())
.map(column -> column.renderWithTableAlias(tableAliasCalculator))
.collect(Collectors.joining(padOperator(), "(", ")")); //$NON-NLS-1$ //$NON-NLS-2$
}
private String padOperator() {
return " " + operator() + " "; //$NON-NLS-1$ //$NON-NLS-2$
}
protected abstract String operator();
}