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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.tomcat.util.bcel.classfile;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import org.apache.tomcat.util.bcel.Constants;
import org.apache.tomcat.util.bcel.util.BCELComparator;
/**
* Represents a Java class, i.e., the data structures, constant pool,
* fields, methods and commands contained in a Java .class file.
* See JVM specification for details.
* The intent of this class is to represent a parsed or otherwise existing
* class file. Those interested in programatically generating classes
* should see the ClassGen class.
* @version $Id: JavaClass.java 1057670 2011-01-11 14:52:05Z markt $
* @author M. Dahm
*/
public class JavaClass extends AccessFlags
implements Cloneable, Comparable {
private static final long serialVersionUID = 7029227708237523236L;
private String file_name;
private String source_file_name = "";
private String class_name;
private String superclass_name;
private int major, minor; // Compiler version
private ConstantPool constant_pool; // Constant pool
private int[] interfaces; // implemented interfaces
private String[] interface_names;
private Field[] fields; // Fields, i.e., variables of class
private Method[] methods; // methods defined in the class
private Attribute[] attributes; // attributes defined in the class
private AnnotationEntry[] annotations; // annotations defined on the class
// Annotations are collected from certain attributes, don't do it more than necessary!
private boolean annotationsOutOfDate = true;
private static BCELComparator _cmp = new BCELComparator() {
@Override
public boolean equals( Object o1, Object o2 ) {
JavaClass THIS = (JavaClass) o1;
JavaClass THAT = (JavaClass) o2;
return THIS.getClassName().equals(THAT.getClassName());
}
@Override
public int hashCode( Object o ) {
JavaClass THIS = (JavaClass) o;
return THIS.getClassName().hashCode();
}
};
/**
* Constructor gets all contents as arguments.
*
* @param class_name_index Index into constant pool referencing a
* ConstantClass that represents this class.
* @param superclass_name_index Index into constant pool referencing a
* ConstantClass that represents this class's superclass.
* @param file_name File name
* @param major Major compiler version
* @param minor Minor compiler version
* @param access_flags Access rights defined by bit flags
* @param constant_pool Array of constants
* @param interfaces Implemented interfaces
* @param fields Class fields
* @param methods Class methods
* @param attributes Class attributes
*/
public JavaClass(int class_name_index, int superclass_name_index, String file_name, int major,
int minor, int access_flags, ConstantPool constant_pool, int[] interfaces,
Field[] fields, Method[] methods, Attribute[] attributes) {
if (interfaces == null) {
interfaces = new int[0];
}
if (attributes == null) {
attributes = new Attribute[0];
}
if (fields == null) {
fields = new Field[0];
}
if (methods == null) {
methods = new Method[0];
}
this.file_name = file_name;
this.major = major;
this.minor = minor;
this.access_flags = access_flags;
this.constant_pool = constant_pool;
this.interfaces = interfaces;
this.fields = fields;
this.methods = methods;
this.attributes = attributes;
annotationsOutOfDate = true;
// Get source file name if available
for (int i = 0; i < attributes.length; i++) {
if (attributes[i] instanceof SourceFile) {
source_file_name = ((SourceFile) attributes[i]).getSourceFileName();
break;
}
}
/* According to the specification the following entries must be of type
* `ConstantClass' but we check that anyway via the
* `ConstPool.getConstant' method.
*/
class_name = constant_pool.getConstantString(class_name_index, Constants.CONSTANT_Class);
class_name = Utility.compactClassName(class_name, false);
if (superclass_name_index > 0) {
// May be zero -> class is java.lang.Object
superclass_name = constant_pool.getConstantString(superclass_name_index,
Constants.CONSTANT_Class);
superclass_name = Utility.compactClassName(superclass_name, false);
} else {
superclass_name = "java.lang.Object";
}
interface_names = new String[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
String str = constant_pool.getConstantString(interfaces[i], Constants.CONSTANT_Class);
interface_names[i] = Utility.compactClassName(str, false);
}
}
/**
* @return Attributes of the class.
*/
public Attribute[] getAttributes() {
return attributes;
}
public AnnotationEntry[] getAnnotationEntries() {
if (annotationsOutOfDate) {
// Find attributes that contain annotation data
Attribute[] attrs = getAttributes();
List accumulatedAnnotations = new ArrayList();
for (int i = 0; i < attrs.length; i++) {
Attribute attribute = attrs[i];
if (attribute instanceof Annotations) {
Annotations runtimeAnnotations = (Annotations)attribute;
for(int j = 0; j < runtimeAnnotations.getAnnotationEntries().length; j++)
accumulatedAnnotations.add(runtimeAnnotations.getAnnotationEntries()[j]);
}
}
annotations = accumulatedAnnotations.toArray(new AnnotationEntry[accumulatedAnnotations.size()]);
annotationsOutOfDate = false;
}
return annotations;
}
/**
* @return Class name.
*/
public String getClassName() {
return class_name;
}
/**
* @return String representing class contents.
*/
@Override
public String toString() {
String access = Utility.accessToString(access_flags, true);
access = access.equals("") ? "" : (access + " ");
StringBuffer buf = new StringBuffer(128);
buf.append(access).append(Utility.classOrInterface(access_flags)).append(" ").append(
class_name).append(" extends ").append(
Utility.compactClassName(superclass_name, false)).append('\n');
int size = interfaces.length;
if (size > 0) {
buf.append("implements\t\t");
for (int i = 0; i < size; i++) {
buf.append(interface_names[i]);
if (i < size - 1) {
buf.append(", ");
}
}
buf.append('\n');
}
buf.append("filename\t\t").append(file_name).append('\n');
buf.append("compiled from\t\t").append(source_file_name).append('\n');
buf.append("compiler version\t").append(major).append(".").append(minor).append('\n');
buf.append("access flags\t\t").append(access_flags).append('\n');
buf.append("constant pool\t\t").append(constant_pool.getLength()).append(" entries\n");
buf.append("ACC_SUPER flag\t\t").append(isSuper()).append("\n");
if (attributes.length > 0) {
buf.append("\nAttribute(s):\n");
for (int i = 0; i < attributes.length; i++) {
buf.append(indent(attributes[i]));
}
}
AnnotationEntry[] annotations = getAnnotationEntries();
if (annotations!=null && annotations.length>0) {
buf.append("\nAnnotation(s):\n");
for (int i=0; i 0) {
buf.append("\n").append(fields.length).append(" fields:\n");
for (int i = 0; i < fields.length; i++) {
buf.append("\t").append(fields[i]).append('\n');
}
}
if (methods.length > 0) {
buf.append("\n").append(methods.length).append(" methods:\n");
for (int i = 0; i < methods.length; i++) {
buf.append("\t").append(methods[i]).append('\n');
}
}
return buf.toString();
}
private static final String indent( Object obj ) {
StringTokenizer tok = new StringTokenizer(obj.toString(), "\n");
StringBuffer buf = new StringBuffer();
while (tok.hasMoreTokens()) {
buf.append("\t").append(tok.nextToken()).append("\n");
}
return buf.toString();
}
public final boolean isSuper() {
return (access_flags & Constants.ACC_SUPER) != 0;
}
/**
* Return value as defined by given BCELComparator strategy.
* By default two JavaClass objects are said to be equal when
* their class names are equal.
*
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals( Object obj ) {
return _cmp.equals(this, obj);
}
/**
* Return the natural ordering of two JavaClasses.
* This ordering is based on the class name
*/
@Override
public int compareTo(JavaClass obj) {
return getClassName().compareTo(obj.getClassName());
}
/**
* Return value as defined by given BCELComparator strategy.
* By default return the hashcode of the class name.
*
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return _cmp.hashCode(this);
}
}
