package org.reflections.adapters;
import javassist.bytecode.AccessFlag;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.ClassFile;
import javassist.bytecode.Descriptor;
import javassist.bytecode.FieldInfo;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.ParameterAnnotationsAttribute;
import javassist.bytecode.annotation.Annotation;
import org.reflections.ReflectionsException;
import org.reflections.util.Utils;
import org.reflections.vfs.Vfs;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static javassist.bytecode.AccessFlag.isPrivate;
import static javassist.bytecode.AccessFlag.isProtected;
import static org.reflections.util.Utils.join;
public class JavassistAdapter implements MetadataAdapter<ClassFile, FieldInfo, MethodInfo> {
public static boolean includeInvisibleTag = true;
public List<FieldInfo> getFields(final ClassFile cls) {
return cls.getFields();
}
public List<MethodInfo> getMethods(final ClassFile cls) {
return cls.getMethods();
}
public String getMethodName(final MethodInfo method) {
return method.getName();
}
public List<String> getParameterNames(final MethodInfo method) {
String descriptor = method.getDescriptor();
descriptor = descriptor.substring(descriptor.indexOf("(") + 1, descriptor.lastIndexOf(")"));
return splitDescriptorToTypeNames(descriptor);
}
public List<String> getClassAnnotationNames(final ClassFile aClass) {
return getAnnotationNames((AnnotationsAttribute) aClass.getAttribute(AnnotationsAttribute.visibleTag),
includeInvisibleTag ? (AnnotationsAttribute) aClass.getAttribute(AnnotationsAttribute.invisibleTag) : null);
}
public List<String> getFieldAnnotationNames(final FieldInfo field) {
return getAnnotationNames((AnnotationsAttribute) field.getAttribute(AnnotationsAttribute.visibleTag),
includeInvisibleTag ? (AnnotationsAttribute) field.getAttribute(AnnotationsAttribute.invisibleTag) : null);
}
public List<String> getMethodAnnotationNames(final MethodInfo method) {
return getAnnotationNames((AnnotationsAttribute) method.getAttribute(AnnotationsAttribute.visibleTag),
includeInvisibleTag ? (AnnotationsAttribute) method.getAttribute(AnnotationsAttribute.invisibleTag) : null);
}
public List<String> getParameterAnnotationNames(final MethodInfo method, final int parameterIndex) {
List<String> result = new ArrayList<>();
List<ParameterAnnotationsAttribute> parameterAnnotationsAttributes = Arrays.asList(
(ParameterAnnotationsAttribute) method.getAttribute(ParameterAnnotationsAttribute.visibleTag),
(ParameterAnnotationsAttribute) method.getAttribute(ParameterAnnotationsAttribute.invisibleTag));
for (ParameterAnnotationsAttribute parameterAnnotationsAttribute : parameterAnnotationsAttributes) {
if (parameterAnnotationsAttribute != null) {
Annotation[][] annotations = parameterAnnotationsAttribute.getAnnotations();
if (parameterIndex < annotations.length) {
Annotation[] annotation = annotations[parameterIndex];
result.addAll(getAnnotationNames(annotation));
}
}
}
return result;
}
public String getReturnTypeName(final MethodInfo method) {
String descriptor = method.getDescriptor();
descriptor = descriptor.substring(descriptor.lastIndexOf(")") + 1);
return splitDescriptorToTypeNames(descriptor).get(0);
}
public String getFieldName(final FieldInfo field) {
return field.getName();
}
public ClassFile getOrCreateClassObject(final Vfs.File file) {
InputStream inputStream = null;
try {
inputStream = file.openInputStream();
DataInputStream dis = new DataInputStream(new BufferedInputStream(inputStream));
return new ClassFile(dis);
} catch (IOException e) {
throw new ReflectionsException("could not create class file from " + file.getName(), e);
} finally {
Utils.close(inputStream);
}
}
public String getMethodModifier(MethodInfo method) {
int accessFlags = method.getAccessFlags();
return isPrivate(accessFlags) ? "private" :
isProtected(accessFlags) ? "protected" :
isPublic(accessFlags) ? "public" : "";
}
public String getMethodKey(ClassFile cls, MethodInfo method) {
return getMethodName(method) + "(" + join(getParameterNames(method), ", ") + ")";
}
public String getMethodFullKey(ClassFile cls, MethodInfo method) {
return getClassName(cls) + "." + getMethodKey(cls, method);
}
public boolean isPublic(Object o) {
Integer accessFlags =
o instanceof ClassFile ? ((ClassFile) o).getAccessFlags() :
o instanceof FieldInfo ? ((FieldInfo) o).getAccessFlags() :
o instanceof MethodInfo ? ((MethodInfo) o).getAccessFlags() : null;
return accessFlags != null && AccessFlag.isPublic(accessFlags);
}
public String getClassName(final ClassFile cls) {
return cls.getName();
}
public String getSuperclassName(final ClassFile cls) {
return cls.getSuperclass();
}
public List<String> getInterfacesNames(final ClassFile cls) {
return Arrays.asList(cls.getInterfaces());
}
public boolean acceptsInput(String file) {
return file.endsWith(".class");
}
private List<String> getAnnotationNames(final AnnotationsAttribute... annotationsAttributes) {
if (annotationsAttributes != null) {
return Arrays.stream(annotationsAttributes)
.filter(Objects::nonNull)
.flatMap(annotationsAttribute -> Arrays.stream(annotationsAttribute.getAnnotations()))
.map(Annotation::getTypeName)
.collect(Collectors.toList());
} else {
return Collections.emptyList();
}
}
private List<String> getAnnotationNames(final Annotation[] annotations) {
return Arrays.stream(annotations).map(Annotation::getTypeName).collect(Collectors.toList());
}
private List<String> splitDescriptorToTypeNames(final String descriptors) {
List<String> result = new ArrayList<>();
if (descriptors != null && descriptors.length() != 0) {
List<Integer> indices = new ArrayList<>();
Descriptor.Iterator iterator = new Descriptor.Iterator(descriptors);
while (iterator.hasNext()) {
indices.add(iterator.next());
}
indices.add(descriptors.length());
result = IntStream.range(0, indices.size() - 1)
.mapToObj(i -> Descriptor.toString(descriptors.substring(indices.get(i), indices.get(i + 1))))
.collect(Collectors.toList());
}
return result;
}
}