Package com.asakusafw.compiler.operator.processor

Source Code of com.asakusafw.compiler.operator.processor.MasterBranchOperatorProcessor

/**
* 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.Collections;
import java.util.List;

import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.VariableElement;

import com.asakusafw.compiler.common.JavaName;
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.OperatorMethodDescriptor;
import com.asakusafw.compiler.operator.OperatorMethodDescriptor.Builder;
import com.asakusafw.compiler.operator.processor.MasterKindOperatorAnalyzer.ResolveException;
import com.asakusafw.vocabulary.flow.graph.FlowBoundary;
import com.asakusafw.vocabulary.flow.graph.ShuffleKey;
import com.asakusafw.vocabulary.operator.MasterBranch;


/**
* {@link MasterBranch マスタ分岐演算子}を処理する。
*/
@TargetOperator(MasterBranch.class)
public class MasterBranchOperatorProcessor 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.isAbstract()) {
            a.error("マスタ分岐演算子はabstractで宣言できません");
        }
        List<VariableElement> constants = Collections.emptyList();
        if (a.getReturnType().isEnum() == false) {
            a.error("マスタ分岐演算子は戻り値にpublicで宣言された列挙型を指定する必要があります");
        } else {
            constants = a.getReturnType().getEnumConstants();
            if (constants.isEmpty()) {
                a.error("マスタ分岐演算子の戻り値は定数が1つ以上宣言された列挙型である必要があります");
            }
        }
        TypeConstraint master = a.getParameterType(0);
        if (master.isModel() == false) {
            a.error(0, "マスタ分岐演算子の1つ目の引数はモデルオブジェクト型である必要があります");
        }
        TypeConstraint transaction = a.getParameterType(1);
        if (transaction.isModel() == false) {
            a.error(1, "マスタ分岐演算子の2つ目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 = 2, n = a.countParameters(); i < n; i++) {
            if (a.getParameterType(i).isBasic() == false) {
                a.error(i, "マスタ分岐演算子の3つ目以降の引数は文字列またはプリミティブ型である必要があります");
            }
        }
        if (a.hasError()) {
            return null;
        }

        ShuffleKey masterKey = a.getParameterKey(0);
        if (masterKey == null) {
            a.error("マスタ分岐演算子の引数には@Key注釈によってグループ化項目を指定する必要があります");
        }
        ShuffleKey transactionKey = a.getParameterKey(1);
        if (transactionKey == null) {
            a.error("マスタ分岐演算子の引数には@Key注釈によってグループ化項目を指定する必要があります");
        }
        ExecutableElement selector = null;
        try {
            selector = MasterKindOperatorAnalyzer.findSelector(context.environment, context);
        } catch (ResolveException e) {
            a.error(e.getMessage());
        }

        if (a.hasError()) {
            return null;
        }

        Builder builder = new Builder(getTargetAnnotationType(), context);
        builder.addAttribute(FlowBoundary.SHUFFLE);
        builder.addAttribute(a.getObservationCount());
        if (selector != null) {
            builder.addOperatorHelper(selector);
        }
        builder.setDocumentation(a.getExecutableDocument());
        builder.addInput(
                a.getParameterDocument(0),
                a.getParameterName(0),
                a.getParameterType(0).getType(),
                0,
                masterKey);
        builder.addInput(
                a.getParameterDocument(1),
                a.getParameterName(1),
                a.getParameterType(1).getType(),
                1,
                transactionKey);
        for (VariableElement var : constants) {
            builder.addOutput(
                    a.getDocument(var),
                    JavaName.of(var.getSimpleName().toString()).toMemberName(),
                    a.getParameterType(1).getType(),
                    a.getParameterName(1),
                    null);
        }
        for (int i = 2, n = a.countParameters(); i < n; i++) {
            builder.addParameter(
                    a.getParameterDocument(i),
                    a.getParameterName(i),
                    a.getParameterType(i).getType(),
                    i);
        }
        return builder.toDescriptor();
    }
}
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