/**
* 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.operator.processor;
import java.util.List;
import com.asakusafw.compiler.common.Precondition;
import com.asakusafw.compiler.common.TargetOperator;
import com.asakusafw.compiler.operator.AbstractOperatorProcessor;
import com.asakusafw.compiler.operator.ExecutableAnalyzer;
import com.asakusafw.compiler.operator.ExecutableAnalyzer.TypeConstraint;
import com.asakusafw.compiler.operator.ImplementationBuilder;
import com.asakusafw.compiler.operator.OperatorMethodDescriptor;
import com.asakusafw.compiler.operator.OperatorMethodDescriptor.Builder;
import com.asakusafw.utils.java.model.syntax.ModelFactory;
import com.asakusafw.utils.java.model.syntax.TypeBodyDeclaration;
import com.asakusafw.utils.java.model.util.Models;
import com.asakusafw.utils.java.model.util.TypeBuilder;
import com.asakusafw.vocabulary.flow.graph.FlowBoundary;
import com.asakusafw.vocabulary.flow.graph.ShuffleKey;
import com.asakusafw.vocabulary.operator.Summarize;
/**
* {@link Summarize 単純集計演算子}を処理する。
*/
@TargetOperator(Summarize.class)
public class SummarizeOperatorProcessor extends AbstractOperatorProcessor {
@Override
public OperatorMethodDescriptor describe(Context context) {
Precondition.checkMustNotBeNull(context, "context"); //$NON-NLS-1$
ExecutableAnalyzer a = new ExecutableAnalyzer(context.environment, context.element);
if (a.isGeneric()) {
a.error("単純集計演算子はジェネリックメソッドで宣言できません");
}
if (a.isAbstract() == false) {
a.error("単純集計演算子はabstractで宣言する必要があります");
}
TypeConstraint summarized = a.getReturnType();
if (summarized.isConcreteModel() == false) {
a.error("単純集計演算子は戻り値にモデルオブジェクト型を指定する必要があります");
}
TypeConstraint summarizee = a.getParameterType(0);
if (summarizee.isModel() == false) {
a.error(0, "単純集計演算子の最初の引数はモデルオブジェクト型である必要があります");
}
for (int i = 1, n = a.countParameters(); i < n; i++) {
a.error(i, "単純集計演算子にはユーザー引数を利用できません");
}
if (a.hasError()) {
return null;
}
if (summarized.isSummarizedModel(summarizee.getType()) == false) {
a.error("単純集計演算子の戻り値型は最初の引数の集計結果を表す型である必要があります");
return null;
}
ShuffleKey key = summarized.getSummarizeKey();
Summarize annotation = context.element.getAnnotation(Summarize.class);
if (annotation == null) {
a.error("注釈の解釈に失敗しました");
return null;
}
OperatorProcessorUtil.checkPortName(a, new String[] {
annotation.summarizedPort(),
});
if (a.hasError()) {
return null;
}
Builder builder = new Builder(getTargetAnnotationType(), context);
builder.addAttribute(FlowBoundary.SHUFFLE);
builder.addAttribute(a.getObservationCount());
builder.addAttribute(annotation.partialAggregation());
builder.setDocumentation(a.getExecutableDocument());
builder.addInput(
a.getParameterDocument(0),
a.getParameterName(0),
a.getParameterType(0).getType(),
0,
key);
builder.addOutput(
a.getReturnDocument(),
annotation.summarizedPort(),
a.getReturnType().getType(),
null,
null);
return builder.toDescriptor();
}
@Override
protected List<? extends TypeBodyDeclaration> override(Context context) {
ImplementationBuilder builder = new ImplementationBuilder(context);
ModelFactory f = context.environment.getFactory();
builder.addStatement(new TypeBuilder(f, context.importer.toType(UnsupportedOperationException.class))
.newObject(Models.toLiteral(f, "単純集計演算子は組み込みの方法で処理されます"))
.toThrowStatement());
return builder.toImplementation();
}
}