/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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 org.kie.workbench.common.stunner.core.processors.rule;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import org.kie.workbench.common.stunner.core.processors.MainProcessor;
import org.kie.workbench.common.stunner.core.processors.ProcessingContext;
import org.kie.workbench.common.stunner.core.processors.ProcessingRule;
import org.uberfire.annotations.processors.AbstractGenerator;
import org.uberfire.annotations.processors.exceptions.GenerationException;
public class DockingRuleGenerator extends AbstractGenerator {
private final ProcessingContext processingContext = ProcessingContext.getInstance();
@Override
public StringBuffer generate(final String packageName,
final PackageElement packageElement,
final String className,
final Element element,
final ProcessingEnvironment processingEnvironment) throws GenerationException {
final Messager messager = processingEnvironment.getMessager();
messager.printMessage(Diagnostic.Kind.NOTE,
"Starting code generation for [" + className + "]");
//Extract required information
final TypeElement classElement = (TypeElement) element;
final String annotationName = MainProcessor.ANNOTATION_RULE_CAN_DOCK;
final String ruleId = MainProcessor.toValidId(className);
final String ruleDefinitionId = ((TypeElement) element).getQualifiedName().toString();
List<String> roles = null;
for (final AnnotationMirror am : classElement.getAnnotationMirrors()) {
if (annotationName.equals(am.getAnnotationType().toString())) {
for (Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry : am.getElementValues().entrySet()) {
AnnotationValue aval = entry.getValue();
if ("roles".equals(entry.getKey().getSimpleName().toString())) {
roles = (List<String>) aval.getValue();
}
}
break;
}
}
processingContext.getDockingRuleElementsProcessed().add(element);
if (roles == null) {
return null;
}
Map<String, Object> root = new HashMap<String, Object>();
root.put("ruleId",
ruleId);
root.put("ruleDefinitionId",
ruleDefinitionId);
root.put("roles",
roles);
root.put("rolesCount",
roles.size());
//Generate code
final StringWriter sw = new StringWriter();
final BufferedWriter bw = new BufferedWriter(sw);
try {
final Template template = config.getTemplate("DockingRule.ftl");
template.process(root,
bw);
} catch (IOException ioe) {
throw new GenerationException(ioe);
} catch (TemplateException te) {
throw new GenerationException(te);
} finally {
try {
bw.close();
sw.close();
} catch (IOException ioe) {
throw new GenerationException(ioe);
}
}
messager.printMessage(Diagnostic.Kind.NOTE,
"Successfully generated code for [" + className + "]");
processingContext.addRule(ruleId,
ProcessingRule.TYPE.DOCKING,
sw.getBuffer());
return null;
}
}