/*
* 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.Map;
import javax.annotation.processing.Messager;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
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.kie.workbench.common.stunner.core.rule.annotation.AllowedEdgeOccurrences;
import org.kie.workbench.common.stunner.core.rule.annotation.EdgeOccurrences;
import org.kie.workbench.common.stunner.core.rule.context.EdgeCardinalityContext;
import org.uberfire.annotations.processors.AbstractGenerator;
import org.uberfire.annotations.processors.exceptions.GenerationException;
public class EdgeCardinalityRuleGenerator 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 adf for [" + className + "]");
final Elements elementUtils = processingEnvironment.getElementUtils();
final String ruleDefinitionId = ((TypeElement) element).getQualifiedName().toString();
//Extract required information
final TypeElement classElement = (TypeElement) element;
AllowedEdgeOccurrences occs = classElement.getAnnotation(AllowedEdgeOccurrences.class);
if (null != occs) {
int count = 0;
for (EdgeOccurrences occurrence : occs.value()) {
String ruleById = classElement.getQualifiedName().toString();
String shortId = ruleById.substring(ruleById.lastIndexOf(".") + 1,
ruleById.length());
String name = shortId + count + MainProcessor.RULE_EDGE_CARDINALITY_SUFFIX_CLASSNAME;
EdgeOccurrences.EdgeType _type = occurrence.type();
EdgeCardinalityContext.Direction type = EdgeOccurrences.EdgeType.INCOMING.equals(_type) ? EdgeCardinalityContext.Direction.INCOMING : EdgeCardinalityContext.Direction.OUTGOING;
final int min = occurrence.min();
final int max = occurrence.max();
final String roles = occurrence.role();
StringBuffer ruleSourceCode = generateRule(messager,
name,
ruleDefinitionId,
roles,
"EdgeCardinalityContext.Direction." + type.name(),
min,
max);
processingContext.addRule(name,
ProcessingRule.TYPE.EDGE_CARDINALITY,
ruleSourceCode);
count++;
}
}
return null;
}
private StringBuffer generateRule(final Messager messager,
final String ruleName,
final String ruleDefinitionId,
final String role,
final String direction,
final long min,
final long max) throws GenerationException {
Map<String, Object> root = new HashMap<String, Object>();
root.put("ruleName",
ruleName);
root.put("edgeId",
ruleDefinitionId);
root.put("role",
role);
root.put("direction",
direction);
root.put("min",
min);
root.put("max",
max);
//Generate code
final StringWriter sw = new StringWriter();
final BufferedWriter bw = new BufferedWriter(sw);
try {
final Template template = config.getTemplate("EdgeCardinalityRule.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 [" + ruleName + "]");
return sw.getBuffer();
}
}