/**
* 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 static org.gennai.gungnir.ql.analysis.GungnirLexer.*;
import org.gennai.gungnir.GungnirTopologyException;
import org.gennai.gungnir.Period;
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.Condition;
import org.gennai.gungnir.tuple.FieldAccessor;
public class FilterGroupClauseAnalyzer {
private SemanticAnalyzer semanticAnalyzer;
public FilterGroupClauseAnalyzer(SemanticAnalyzer semanticAnalyzer) {
this.semanticAnalyzer = semanticAnalyzer;
}
private Condition[] conditionsAnalyze(ASTNode node) throws SemanticAnalyzeException {
Condition[] conditions = new Condition[node.getChildCount()];
for (int i = 0; i < node.getChildCount(); i++) {
conditions[i] = semanticAnalyzer.analyzeByAnalyzer(node.getChild(i));
}
return conditions;
}
public Stream analyze(ASTNode node, Stream stream)
throws SemanticAnalyzeException, GungnirTopologyException {
Period expire = semanticAnalyzer.analyzeByAnalyzer(node.getChild(0));
FieldAccessor stateField = null;
Condition[] conditions = null;
Integer parallelism = null;
if (node.getChild(1).getType() == Identifier) {
String fieldName = semanticAnalyzer.analyzeByAnalyzer(node.getChild(1));
stateField = new FieldAccessor(fieldName);
conditions = conditionsAnalyze(node.getChild(2));
parallelism = semanticAnalyzer.analyzeByAnalyzer(node.getChild(3));
} else {
conditions = conditionsAnalyze(node.getChild(1));
parallelism = semanticAnalyzer.analyzeByAnalyzer(node.getChild(2));
}
if (stream instanceof SingleStream) {
return ((SingleStream) stream).filterGroup(expire, stateField, conditions).parallelism(
parallelism);
} else {
return ((GroupedStream<?>) stream).filterGroup(expire, stateField, conditions)
.parallelism(parallelism);
}
}
}