/*
* ModeShape (http://www.modeshape.org)
*
* 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.modeshape.sequencer.classfile.metadata;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import javassist.bytecode.AccessFlag;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.AttributeInfo;
import javassist.bytecode.ClassFile;
import javassist.bytecode.Descriptor;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.annotation.Annotation;
public class MethodMetadata implements Comparable<MethodMetadata> {
private final MethodInfo method;
private final String name;
private final List<AnnotationMetadata> annotations;
private final List<String> parameters;
MethodMetadata( ClassFile clazz,
MethodInfo method ) {
this.method = method;
this.name = method.isConstructor() ? clazz.getName() : method.getName();
this.annotations = annotationsFor(method);
this.parameters = parametersFor(method);
}
private List<String> parametersFor( MethodInfo method ) {
String descriptor = method.getDescriptor();
int lastParenPos = descriptor.lastIndexOf(')');
assert lastParenPos >= 0;
String parameterString = descriptor.substring(1, lastParenPos);
if (parameterString.length() == 0) {
return Collections.emptyList();
}
List<String> parameters = new ArrayList<String>();
Descriptor.Iterator iter = new Descriptor.Iterator(parameterString);
assert iter.hasNext();
int startPos = iter.next();
while (iter.hasNext()) {
int endPos = iter.next();
parameters.add(Descriptor.toClassName(parameterString.substring(startPos, endPos)));
startPos = endPos;
}
parameters.add(Descriptor.toClassName(parameterString.substring(startPos)));
return parameters;
}
private String returnTypeFor( MethodInfo method ) {
String descriptor = method.getDescriptor();
int lastParenPos = descriptor.lastIndexOf(')');
assert lastParenPos >= 0;
return Descriptor.toClassName(descriptor.substring(lastParenPos + 1));
}
private List<AnnotationMetadata> annotationsFor( MethodInfo method ) {
List<AnnotationMetadata> annotations = new LinkedList<AnnotationMetadata>();
for (Object ob : method.getAttributes()) {
AttributeInfo att = (AttributeInfo)ob;
if (att instanceof AnnotationsAttribute) {
for (Annotation ann : ((AnnotationsAttribute)att).getAnnotations()) {
annotations.add(new AnnotationMetadata(ann));
}
}
}
return annotations;
}
private String shortNameFor( String type ) {
int lastDotPos = type.lastIndexOf('.');
if (lastDotPos < 0) return type;
return type.substring(lastDotPos + 1);
}
public String getName() {
return name;
}
public Visibility getVisibility() {
return Visibility.fromAccessFlags(method.getAccessFlags());
}
public boolean isConstructor() {
return method.isConstructor();
}
public String getReturnType() {
return returnTypeFor(method);
}
public List<AnnotationMetadata> getAnnotations() {
return annotations;
}
public List<String> getParameters() {
return parameters;
}
public boolean isStatic() {
return AccessFlag.STATIC == (AccessFlag.STATIC & method.getAccessFlags());
}
public boolean isFinal() {
return AccessFlag.FINAL == (AccessFlag.FINAL & method.getAccessFlags());
}
public boolean isAbstract() {
return AccessFlag.ABSTRACT == (AccessFlag.ABSTRACT & method.getAccessFlags());
}
public boolean isNative() {
return AccessFlag.NATIVE == (AccessFlag.NATIVE & method.getAccessFlags());
}
public boolean isStrictFp() {
return AccessFlag.STRICT == (AccessFlag.STRICT & method.getAccessFlags());
}
public boolean isSynchronized() {
return AccessFlag.SYNCHRONIZED == (AccessFlag.SYNCHRONIZED & method.getAccessFlags());
}
@Override
public int compareTo( MethodMetadata o ) {
if (this.isStatic() && !o.isStatic()) {
return -1;
}
if (!this.isStatic() && o.isStatic()) {
return 1;
}
if (!this.name.equals(o.name)) {
return this.name.compareTo(o.name);
}
if (this.parameters.size() != o.parameters.size()) {
return ((Integer)this.parameters.size()).compareTo(o.parameters.size());
}
for (int i = 0; i < parameters.size(); i++) {
String p1 = this.parameters.get(i);
String p2 = o.parameters.get(i);
if (!p1.equals(p2)) {
return p1.compareTo(p2);
}
}
return 0;
}
public String getId() {
StringBuilder buff = new StringBuilder();
buff.append(method.getName()).append('(');
boolean first = false;
for (String parameter : parameters) {
if (first) {
first = false;
} else {
buff.append(", ");
}
buff.append(shortNameFor(parameter).replace("[]", " array"));
}
buff.append(')');
return buff.toString();
}
@Override
public String toString() {
StringBuilder buff = new StringBuilder();
if (!annotations.isEmpty()) {
for (AnnotationMetadata annotation : annotations) {
buff.append(annotation).append("\n\t");
}
}
buff.append(getVisibility());
if (getVisibility() != Visibility.PACKAGE) buff.append(' ');
if (isFinal()) buff.append("final ");
if (isStatic()) buff.append("static ");
buff.append(shortNameFor(getReturnType())).append(' ');
buff.append(name).append('(');
boolean first = true;
for (String parameter : parameters) {
if (first) {
first = false;
} else {
buff.append(", ");
}
buff.append(shortNameFor(parameter));
}
buff.append(' ');
buff.append(");");
return buff.toString();
}
}