com.blazebit.persistence.impl.function.window.groupconcat.H2GroupConcatWindowFunction Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* 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.blazebit.persistence.impl.function.window.groupconcat;
import com.blazebit.persistence.impl.function.Order;
import com.blazebit.persistence.spi.DbmsDialect;
import com.blazebit.persistence.spi.FunctionRenderContext;
import java.util.List;
/**
*
* @author Christian Beikov
* @since 1.4.0
*/
public class H2GroupConcatWindowFunction extends AbstractGroupConcatWindowFunction {
public H2GroupConcatWindowFunction(DbmsDialect dbmsDialect) {
// In group_concat H2 does not support the nulls clause
super("group_concat", dbmsDialect.isNullSmallest(), false, dbmsDialect.supportsFilterClause(), true);
}
protected void renderArguments(FunctionRenderContext context, WindowFunction windowFunction) {
GroupConcat groupConcat = (GroupConcat) windowFunction;
if ((groupConcat).isDistinct()) {
context.addChunk("distinct ");
}
super.renderArguments(context, windowFunction);
context.addChunk(" separator ");
context.addChunk(quoted(groupConcat.getSeparator()));
super.renderOrderBy(context, windowFunction.getOrderBys());
}
protected void renderOrderBy(FunctionRenderContext context, List orderBys) {
// Don't render the ORDER BY clause in the OVER clause
}
@Override
protected boolean optimizeNullPrecedence() {
// H2 has a special null ordering and since group_concat does not support the nulls clause, we need the full emulation
return false;
}
}