/**
* Copyright 2011-2014 Asakusa Framework Team.
*
* 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.asakusafw.compiler.flow.processor;
import java.util.List;
import com.asakusafw.compiler.common.Precondition;
import com.asakusafw.compiler.common.TargetOperator;
import com.asakusafw.compiler.flow.RendezvousProcessor;
import com.asakusafw.utils.collections.Lists;
import com.asakusafw.utils.java.model.syntax.Expression;
import com.asakusafw.utils.java.model.syntax.ModelFactory;
import com.asakusafw.utils.java.model.util.ExpressionBuilder;
import com.asakusafw.utils.java.model.util.Models;
import com.asakusafw.vocabulary.flow.graph.FlowElementDescription;
import com.asakusafw.vocabulary.flow.graph.FlowElementPortDescription;
import com.asakusafw.vocabulary.flow.graph.OperatorDescription;
import com.asakusafw.vocabulary.flow.processor.PartialAggregation;
import com.asakusafw.vocabulary.operator.Fold;
/**
* {@link Fold 畳み込み演算子}を処理する。
*/
@TargetOperator(Fold.class)
public class FoldFlowProcessor extends RendezvousProcessor {
@Override
public void emitRendezvous(Context context) {
ModelFactory f = context.getModelFactory();
OperatorDescription desc = context.getOperatorDescription();
FlowElementPortDescription input = context.getInputPort(Fold.ID_INPUT);
FlowElementPortDescription output = context.getOutputPort(Fold.ID_OUTPUT);
Expression init = context.createField(boolean.class, "initialized");
context.addBegin(new ExpressionBuilder(f, init)
.assignFrom(Models.toLiteral(f, false))
.toStatement());
DataObjectMirror cache = context.createModelCache(output.getDataType());
Expression impl = context.createImplementation();
Expression proc = context.getProcessInput(input);
List<Expression> arguments = Lists.create();
arguments.add(cache.get());
arguments.add(proc);
for (OperatorDescription.Parameter param : desc.getParameters()) {
arguments.add(Models.toLiteral(f, param.getValue()));
}
context.addProcess(input, f.newIfStatement(
init,
f.newBlock(new ExpressionBuilder(f, impl)
.method(desc.getDeclaration().getName(), arguments)
.toStatement()),
f.newBlock(
cache.createSet(proc),
new ExpressionBuilder(f, init)
.assignFrom(Models.toLiteral(f, true))
.toStatement())));
ResultMirror result = context.getOutput(context.getOutputPort(Fold.ID_OUTPUT));
context.addEnd(result.createAdd(cache.get()));
}
@Override
public boolean isPartial(FlowElementDescription description) {
Precondition.checkMustNotBeNull(description, "description"); //$NON-NLS-1$
PartialAggregation partial = description.getAttribute(PartialAggregation.class);
if (partial == PartialAggregation.PARTIAL) {
return true;
} else if (partial == PartialAggregation.TOTAL) {
return false;
}
return getEnvironment().getOptions().isEnableCombiner();
}
}