/*
* Copyright 2014 the original author or authors.
*
* 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 ratpack.handling.internal;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import javassist.ClassPool;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.bytecode.ClassFile;
import ratpack.handling.Handler;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
public class DescribingHandlers {
public static void describeTo(Handler handler, StringBuilder stringBuilder) {
Class<? extends Handler> clazz = handler.getClass();
if (clazz.isAnonymousClass()) {
ClassPool pool = ClassPool.getDefault();
CtClass ctClass;
try {
ctClass = pool.get(clazz.getName());
CtBehavior[] behaviors = ctClass.getDeclaredBehaviors();
Iterable<CtBehavior> withLineNumberIterable = Iterables.filter(Arrays.asList(behaviors), input -> input.getMethodInfo().getLineNumber(0) > 0);
LinkedList<CtBehavior> withLineNumber = Lists.newLinkedList(withLineNumberIterable);
Collections.sort(withLineNumber, (o1, o2) -> Integer.valueOf(o1.getMethodInfo().getLineNumber(0)).compareTo(o2.getMethodInfo().getLineNumber(0)));
if (!withLineNumber.isEmpty()) {
CtBehavior method = withLineNumber.get(0);
int lineNumber = method.getMethodInfo().getLineNumber(0);
ClassFile classFile = ctClass.getClassFile();
String sourceFile = classFile.getSourceFile();
if (lineNumber != -1 && sourceFile != null) {
stringBuilder
.append("anonymous class ")
.append(clazz.getName())
.append(" at approximately line ")
.append(lineNumber)
.append(" of ")
.append(sourceFile);
return;
}
}
} catch (NotFoundException ignore) {
// fall through
}
}
stringBuilder.append(clazz.getName());
}
}