/**
* 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.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.OperatorMethodDescriptor;
import com.asakusafw.compiler.operator.OperatorMethodDescriptor.Builder;
import com.asakusafw.vocabulary.operator.Branch;
/**
* {@link Branch 分岐演算子}を処理する。
*/
@TargetOperator(Branch.class)
public class BranchOperatorProcessor 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("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("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("分岐演算子の戻り値は定数が一つ以上宣言された列挙型である必要があります");
}
}
if (a.getParameterType(0).isModel() == false) {
a.error(0, "分岐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++) {
if (a.getParameterType(i).isBasic() == false) {
a.error(i, "分岐演算子の2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;
}
Builder builder = new Builder(getTargetAnnotationType(), context);
builder.addAttribute(a.getObservationCount());
builder.setDocumentation(a.getExecutableDocument());
builder.addInput(
a.getParameterDocument(0),
a.getParameterName(0),
a.getParameterType(0).getType(),
0);
for (VariableElement var : constants) {
builder.addOutput(
a.getDocument(var),
JavaName.of(var.getSimpleName().toString()).toMemberName(),
a.getParameterType(0).getType(),
a.getParameterName(0),
null);
}
for (int i = 1, n = a.countParameters(); i < n; i++) {
builder.addParameter(
a.getParameterDocument(i),
a.getParameterName(i),
a.getParameterType(i).getType(),
i);
}
return builder.toDescriptor();
}
}