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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* Copyright (C) 2022 Huawei. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.genprocessor;
import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.ClassFile;
import javassist.bytecode.ConstPool;
import javassist.bytecode.annotation.Annotation;
import javassist.bytecode.annotation.ArrayMemberValue;
import javassist.bytecode.annotation.MemberValue;
import javassist.bytecode.annotation.StringMemberValue;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.commons.text.StringEscapeUtils;
import org.apache.nifi.annotation.documentation.CapabilityDescription;
import org.apache.nifi.annotation.documentation.Tags;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ProcessorBuilder {
static final Logger LOG = LoggerFactory.getLogger(ProcessBuilder.class);
public static class ProcessorBuilderError extends RuntimeException {
public ProcessorBuilderError(Throwable e) {
super("Error while generating DCAEProcessor", e);
}
}
private static Annotation createAnnotationDescription(String description, ConstPool constPool) {
// https://www.codota.com/code/java/packages/javassist.bytecode showed me that
// the constructor
// adds a UTF8 object thing so I'm guessing that the index value when doing
// addMemberValue
// should match that of the newly added object otherwise you get a nullpointer
Annotation annDescrip = new Annotation(CapabilityDescription.class.getName(), constPool);
// Tried to use the index version of addMemberValue with index of
// constPool.getSize()-1
// but didn't work
annDescrip.addMemberValue("value", new StringMemberValue(description, constPool));
return annDescrip;
}
private static Annotation createAnnotationTags(String[] tags, ConstPool constPool) {
Annotation annTags = new Annotation(Tags.class.getName(), constPool);
ArrayMemberValue mv = new ArrayMemberValue(constPool);
List<MemberValue> elements = new ArrayList<MemberValue>();
for (String tag : tags) {
elements.add(new StringMemberValue(tag, constPool));
}
mv.setValue(elements.toArray(new MemberValue[elements.size()]));
// Tried to use the index version of addMemberValue with index of
// constPool.getSize()-1
// but didn't work
annTags.addMemberValue("value", mv);
return annTags;
}
public static String[] createTags(CompSpec compSpec) {
List<String> tags = new ArrayList<>();
tags.add("DCAE");
// TODO: Need to source type from spec
if (compSpec.name.toLowerCase().contains("collector")) {
tags.add("collector");
}
if (!compSpec.getPublishes().isEmpty()) {
tags.add("publisher");
}
if (!compSpec.getSubscribes().isEmpty()) {
tags.add("subscriber");
}
String[] tagArray = new String[tags.size()];
return tags.toArray(tagArray);
}
public static void addAnnotationsProcessor(CtClass target, String description, String[] tags) {
ClassFile ccFile = target.getClassFile();
ConstPool constPool = ccFile.getConstPool();
AnnotationsAttribute attr = new AnnotationsAttribute(constPool, AnnotationsAttribute.visibleTag);
attr.addAnnotation(createAnnotationDescription(description, constPool));
attr.addAnnotation(createAnnotationTags(tags, constPool));
ccFile.addAttribute(attr);
}
public static void addMethod(CtClass target, String methodCode) {
try {
CtMethod method = CtMethod.make(methodCode, target);
target.addMethod(method);
} catch (CannotCompileException e) {
LOG.error(String.format("Issue with this code:\n%s", methodCode));
LOG.error(e.toString(), e);
throw new ProcessorBuilderError(e);
}
}
private static String createCodeGetter(String methodName, String returnValue) {
return String.format("public java.lang.String get%s() { return \"%s\"; }", methodName, returnValue);
}
public static void setComponentPropertyGetters(CtClass target, Comp comp) {
addMethod(target, createCodeGetter("Name", comp.compSpec.name));
addMethod(target, createCodeGetter("Version", comp.compSpec.version));
addMethod(target, createCodeGetter("ComponentId", comp.id));
addMethod(target, createCodeGetter("ComponentUrl", comp.selfUrl));
}
private static String convertParameterToCode(CompSpec.Parameter param) {
StringBuilder sb = new StringBuilder("props.add(new org.apache.nifi.components.PropertyDescriptor.Builder()");
sb.append(String.format(".name(\"%s\")", param.name));
sb.append(String.format(".displayName(\"%s\")", param.name));
sb.append(String.format(".description(\"%s\")", StringEscapeUtils.escapeJava(param.description)));
sb.append(String.format(".defaultValue(\"%s\")", StringEscapeUtils.escapeJava(param.value)));
sb.append(".build());");
return sb.toString();
}
private static String createCodePropertyDescriptors(CompSpec compSpec) {
List<String> linesParams = compSpec.parameters.stream().map(p -> convertParameterToCode(p)).collect(Collectors.toList());
// NOTE: Generics are only partially supported https://www.javassist.org/tutorial/tutorial3.html#generics
String[] lines = new String[] {"protected java.util.List buildSupportedPropertyDescriptors() {"
, "java.util.List props = new java.util.LinkedList();"
, String.join("\n", linesParams.toArray(new String[linesParams.size()]))
, "return props; }"
};
return String.join("\n", lines);
}
public static void setProcessorPropertyDescriptors(CtClass target, CompSpec compSpec) {
addMethod(target, createCodePropertyDescriptors(compSpec));
}
private static String createRelationshipName(CompSpec.Connection connection, String direction) {
// TODO: Revisit this name thing ugh
return String.format("%s:%s:%s:%s:%s",
direction, connection.format.toLowerCase(), connection.version, connection.type, connection.configKey);
}
private static String convertConnectionToCode(CompSpec.Connection connection, String direction) {
StringBuilder sb = new StringBuilder("rels.add(new org.apache.nifi.processor.Relationship.Builder()");
sb.append(String.format(".name(\"%s\")", createRelationshipName(connection, direction)));
sb.append(".build());");
return sb.toString();
}
private static String createCodeRelationships(CompSpec compSpec) {
List<String> linesPubs = compSpec.getPublishes().stream().map(c -> convertConnectionToCode(c, "publishes")).collect(Collectors.toList());
List<String> linesSubs = compSpec.getSubscribes().stream().map(c -> convertConnectionToCode(c, "subscribes")).collect(Collectors.toList());
String [] lines = new String[] {"protected java.util.Set buildRelationships() {"
, "java.util.Set rels = new java.util.HashSet();"
, String.join("\n", linesPubs.toArray(new String[linesPubs.size()]))
, String.join("\n", linesSubs.toArray(new String[linesSubs.size()]))
, "return rels; }"
};
return String.join("\n", lines);
}
public static void setProcessorRelationships(CtClass target, CompSpec compSpec) {
addMethod(target, createCodeRelationships(compSpec));
}
}
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