/**
* Copyright 2013-2014 Recruit Technologies Co., Ltd. and contributors
* (see CONTRIBUTORS.md)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. A copy of the
* License is distributed with this work in the LICENSE.md file. You may
* also obtain a copy of the License from
*
* 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.gennai.gungnir.ql.analysis.analyzer;
import org.gennai.gungnir.GungnirTopologyException;
import org.gennai.gungnir.ql.analysis.ASTNode;
import org.gennai.gungnir.ql.analysis.SemanticAnalyzeException;
import org.gennai.gungnir.ql.analysis.SemanticAnalyzer;
import org.gennai.gungnir.ql.stream.GroupedStream;
import org.gennai.gungnir.ql.stream.Stream;
import org.gennai.gungnir.ql.stream.SingleStream;
import org.gennai.gungnir.tuple.FieldAccessor;
public class BeginGroupClauseAnalyzer {
private SemanticAnalyzer semanticAnalyzer;
public BeginGroupClauseAnalyzer(SemanticAnalyzer semanticAnalyzer) {
this.semanticAnalyzer = semanticAnalyzer;
}
public Stream analyze(ASTNode node, Stream stream)
throws SemanticAnalyzeException, GungnirTopologyException {
FieldAccessor[] fields = semanticAnalyzer.analyzeByAnalyzer(node.getChild(0));
if (stream instanceof SingleStream) {
return ((SingleStream) stream).beginGroupBy(fields);
} else {
return ((GroupedStream<?>) stream).beginGroupBy(fields);
}
}
}