/**
* 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.flow;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.Collections;
import java.util.List;
import javax.annotation.processing.FilerException;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.asakusafw.compiler.common.Precondition;
import com.asakusafw.compiler.operator.OperatorCompilingEnvironment;
import com.asakusafw.utils.java.jsr269.bridge.Jsr269;
import com.asakusafw.utils.java.model.syntax.Comment;
import com.asakusafw.utils.java.model.syntax.CompilationUnit;
import com.asakusafw.utils.java.model.syntax.ImportDeclaration;
import com.asakusafw.utils.java.model.syntax.ModelFactory;
import com.asakusafw.utils.java.model.syntax.PackageDeclaration;
import com.asakusafw.utils.java.model.syntax.TypeDeclaration;
import com.asakusafw.utils.java.model.util.ImportBuilder;
import com.asakusafw.utils.java.model.util.ImportBuilder.Strategy;
/**
* {@link FlowPartClass}をファイルに出力する。
* @since 0.1.0
* @version 0.7.0
*/
public class FlowClassEmitter {
static final Logger LOG = LoggerFactory.getLogger(FlowClassEmitter.class);
private static final String KEY_SUFFIX_FACTORY = "FACTORY";
private final OperatorCompilingEnvironment environment;
/**
* インスタンスを生成する。
* @param environment 環境オブジェクト
* @throws IllegalArgumentException 引数に{@code null}が含まれる場合
*/
public FlowClassEmitter(OperatorCompilingEnvironment environment) {
Precondition.checkMustNotBeNull(environment, "environment"); //$NON-NLS-1$
this.environment = environment;
}
/**
* 指定のフロー部品クラスから演算子ファクトリークラスを生成して出力する。
* @param aClass フロー部品クラス
* @throws IllegalArgumentException 引数に{@code null}が含まれる場合
*/
public void emit(FlowPartClass aClass) {
assert aClass != null;
String key = getResourceKey(aClass, KEY_SUFFIX_FACTORY);
if (key != null && environment.isResourceGenerated(key)) {
return;
}
ModelFactory f = environment.getFactory();
PackageDeclaration packageDecl = getPackage(f, aClass);
ImportBuilder imports = getImportBuilder(f, packageDecl);
FlowFactoryClassGenerator generator = new FlowFactoryClassGenerator(
environment,
f,
imports,
aClass);
TypeDeclaration type = generator.generate();
List<ImportDeclaration> decls = imports.toImportDeclarations();
try {
emit(key, f, packageDecl, decls, type, aClass.getElement());
} catch (IOException e) {
LOG.debug(e.getMessage(), e);
environment.getMessager().printMessage(Diagnostic.Kind.ERROR,
MessageFormat.format(
"{0}に対する演算子ファクトリークラスの作成に失敗しました ({1})",
aClass.getElement().getQualifiedName().toString(),
e.getMessage()));
}
}
private void emit(
String key,
ModelFactory factory,
PackageDeclaration packageDecl,
List<ImportDeclaration> importDecls,
TypeDeclaration typeDecl,
TypeElement originating) throws IOException {
CompilationUnit unit = factory.newCompilationUnit(
packageDecl,
importDecls,
Collections.singletonList(typeDecl),
Collections.<Comment>emptyList());
try {
environment.emit(unit, originating);
if (key != null) {
environment.setResourceGenerated(key);
}
} catch (FilerException e) {
LOG.debug(MessageFormat.format(
"{0} has been already created in this session",
typeDecl.getName().toNameString()), e);
}
}
private String getResourceKey(FlowPartClass aClass, String suffix) {
assert aClass != null;
return String.format("%s::%s", aClass.getElement().getQualifiedName(), suffix);
}
private PackageDeclaration getPackage(
ModelFactory factory,
FlowPartClass aClass) {
PackageElement parent = (PackageElement) aClass.getElement().getEnclosingElement();
return new Jsr269(factory).convert(parent);
}
private ImportBuilder getImportBuilder(
ModelFactory factory,
PackageDeclaration packageDecl) {
assert factory != null;
assert packageDecl != null;
return new ImportBuilder(factory, packageDecl, Strategy.TOP_LEVEL);
}
}