com.sun.org.apache.bcel.internal.classfile.JavaClass Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jaxp-ri Show documentation
Show all versions of jaxp-ri Show documentation
Java API for XML Processing Reference Implementation
The newest version!
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.org.apache.bcel.internal.classfile;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* ";
private int class_name_index;
private int superclass_name_index;
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 byte source = HEAP; // Generated in memory
public static final byte HEAP = 1;
public static final byte FILE = 2;
public static final byte ZIP = 3;
static boolean debug = false; // Debugging on/off
static char sep = '/'; // directory separator
/**
* In cases where we go ahead and create something,
* use the default SyntheticRepository, because we
* don't know any better.
*/
private transient com.sun.org.apache.bcel.internal.util.Repository repository =
SyntheticRepository.getInstance();
/**
* 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
* @param source Read from file or generated in memory?
*/
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,
byte source)
{
if(interfaces == null) // Allowed for backward compatibility
interfaces = new int[0];
if(attributes == null)
this.attributes = new Attribute[0];
if(fields == null)
fields = new Field[0];
if(methods == null)
methods = new Method[0];
this.class_name_index = class_name_index;
this.superclass_name_index = superclass_name_index;
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;
this.source = source;
// 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);
int index = class_name.lastIndexOf('.');
if(index < 0)
package_name = "";
else
package_name = class_name.substring(0, index);
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);
}
}
/**
* Constructor gets all contents as arguments.
*
* @param class_name_index Class name
* @param superclass_name_index Superclass name
* @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) {
this(class_name_index, superclass_name_index, file_name, major, minor, access_flags,
constant_pool, interfaces, fields, methods, attributes, HEAP);
}
/**
* Called by objects that are traversing the nodes of the tree implicitely
* defined by the contents of a Java class. I.e., the hierarchy of methods,
* fields, attributes, etc. spawns a tree of objects.
*
* @param v Visitor object
*/
public void accept(Visitor v) {
v.visitJavaClass(this);
}
/* Print debug information depending on `JavaClass.debug'
*/
static final void Debug(String str) {
if(debug)
System.out.println(str);
}
/**
* Dump class to a file.
*
* @param file Output file
* @throws IOException
*/
public void dump(File file) throws IOException
{
String parent = file.getParent();
if(parent != null) {
File dir = new File(parent);
if(dir != null)
dir.mkdirs();
}
dump(new DataOutputStream(new FileOutputStream(file)));
}
/**
* Dump class to a file named file_name.
*
* @param file_name Output file name
* @exception IOException
*/
public void dump(String file_name) throws IOException
{
dump(new File(file_name));
}
/**
* @return class in binary format
*/
public byte[] getBytes() {
ByteArrayOutputStream s = new ByteArrayOutputStream();
DataOutputStream ds = new DataOutputStream(s);
try {
dump(ds);
} catch(IOException e) {
e.printStackTrace();
} finally {
try { ds.close(); } catch(IOException e2) { e2.printStackTrace(); }
}
return s.toByteArray();
}
/**
* Dump Java class to output stream in binary format.
*
* @param file Output stream
* @exception IOException
*/
public void dump(OutputStream file) throws IOException {
dump(new DataOutputStream(file));
}
/**
* Dump Java class to output stream in binary format.
*
* @param file Output stream
* @exception IOException
*/
public void dump(DataOutputStream file) throws IOException
{
file.writeInt(0xcafebabe);
file.writeShort(minor);
file.writeShort(major);
constant_pool.dump(file);
file.writeShort(access_flags);
file.writeShort(class_name_index);
file.writeShort(superclass_name_index);
file.writeShort(interfaces.length);
for(int i=0; i < interfaces.length; i++)
file.writeShort(interfaces[i]);
file.writeShort(fields.length);
for(int i=0; i < fields.length; i++)
fields[i].dump(file);
file.writeShort(methods.length);
for(int i=0; i < methods.length; i++)
methods[i].dump(file);
if(attributes != null) {
file.writeShort(attributes.length);
for(int i=0; i < attributes.length; i++)
attributes[i].dump(file);
}
else
file.writeShort(0);
file.close();
}
/**
* @return Attributes of the class.
*/
public Attribute[] getAttributes() { return attributes; }
/**
* @return Class name.
*/
public String getClassName() { return class_name; }
/**
* @return Package name.
*/
public String getPackageName() { return package_name; }
/**
* @return Class name index.
*/
public int getClassNameIndex() { return class_name_index; }
/**
* @return Constant pool.
*/
public ConstantPool getConstantPool() { return constant_pool; }
/**
* @return Fields, i.e., variables of the class. Like the JVM spec
* mandates for the classfile format, these fields are those specific to
* this class, and not those of the superclass or superinterfaces.
*/
public Field[] getFields() { return fields; }
/**
* @return File name of class, aka SourceFile attribute value
*/
public String getFileName() { return file_name; }
/**
* @return Names of implemented interfaces.
*/
public String[] getInterfaceNames() { return interface_names; }
/**
* @return Indices in constant pool of implemented interfaces.
*/
public int[] getInterfaceIndices() { return interfaces; }
/**
* @return Major number of class file version.
*/
public int getMajor() { return major; }
/**
* @return Methods of the class.
*/
public Method[] getMethods() { return methods; }
/**
* @return A com.sun.org.apache.bcel.internal.classfile.Method corresponding to
* java.lang.reflect.Method if any
*/
public Method getMethod(java.lang.reflect.Method m) {
for(int i = 0; i < methods.length; i++) {
Method method = methods[i];
if(m.getName().equals(method.getName()) &&
(m.getModifiers() == method.getModifiers()) &&
Type.getSignature(m).equals(method.getSignature())) {
return method;
}
}
return null;
}
/**
* @return Minor number of class file version.
*/
public int getMinor() { return minor; }
/**
* @return sbsolute path to file where this class was read from
*/
public String getSourceFileName() { return source_file_name; }
/**
* @return Superclass name.
*/
public String getSuperclassName() { return superclass_name; }
/**
* @return Class name index.
*/
public int getSuperclassNameIndex() { return superclass_name_index; }
static {
// Debugging ... on/off
String debug = null, sep = null;
try {
debug = System.getProperty("JavaClass.debug");
// Get path separator either / or \ usually
sep = System.getProperty("file.separator");
}
catch (SecurityException e) {
// falls through
}
if(debug != null)
JavaClass.debug = new Boolean(debug).booleanValue();
if(sep != null)
try {
JavaClass.sep = sep.charAt(0);
} catch(StringIndexOutOfBoundsException e) {} // Never reached
}
/**
* @param attributes .
*/
public void setAttributes(Attribute[] attributes) {
this.attributes = attributes;
}
/**
* @param class_name .
*/
public void setClassName(String class_name) {
this.class_name = class_name;
}
/**
* @param class_name_index .
*/
public void setClassNameIndex(int class_name_index) {
this.class_name_index = class_name_index;
}
/**
* @param constant_pool .
*/
public void setConstantPool(ConstantPool constant_pool) {
this.constant_pool = constant_pool;
}
/**
* @param fields .
*/
public void setFields(Field[] fields) {
this.fields = fields;
}
/**
* Set File name of class, aka SourceFile attribute value
*/
public void setFileName(String file_name) {
this.file_name = file_name;
}
/**
* @param interface_names .
*/
public void setInterfaceNames(String[] interface_names) {
this.interface_names = interface_names;
}
/**
* @param interfaces .
*/
public void setInterfaces(int[] interfaces) {
this.interfaces = interfaces;
}
/**
* @param major .
*/
public void setMajor(int major) {
this.major = major;
}
/**
* @param methods .
*/
public void setMethods(Method[] methods) {
this.methods = methods;
}
/**
* @param minor .
*/
public void setMinor(int minor) {
this.minor = minor;
}
/**
* Set absolute path to file this class was read from.
*/
public void setSourceFileName(String source_file_name) {
this.source_file_name = source_file_name;
}
/**
* @param superclass_name .
*/
public void setSuperclassName(String superclass_name) {
this.superclass_name = superclass_name;
}
/**
* @param superclass_name_index .
*/
public void setSuperclassNameIndex(int superclass_name_index) {
this.superclass_name_index = superclass_name_index;
}
/**
* @return String representing class contents.
*/
public String toString() {
String access = Utility.accessToString(access_flags, true);
access = access.equals("")? "" : (access + " ");
StringBuffer buf = new StringBuffer(access +
Utility.classOrInterface(access_flags) +
" " +
class_name + " extends " +
Utility.compactClassName(superclass_name,
false) + '\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" + file_name + '\n');
buf.append("compiled from\t\t" + source_file_name + '\n');
buf.append("compiler version\t" + major + "." + minor + '\n');
buf.append("access flags\t\t" + access_flags + '\n');
buf.append("constant pool\t\t" + constant_pool.getLength() + " entries\n");
buf.append("ACC_SUPER flag\t\t" + isSuper() + "\n");
if(attributes.length > 0) {
buf.append("\nAttribute(s):\n");
for(int i=0; i < attributes.length; i++)
buf.append(indent(attributes[i]));
}
if(fields.length > 0) {
buf.append("\n" + fields.length + " fields:\n");
for(int i=0; i < fields.length; i++)
buf.append("\t" + fields[i] + '\n');
}
if(methods.length > 0) {
buf.append("\n" + methods.length + " methods:\n");
for(int i=0; i < methods.length; i++)
buf.append("\t" + methods[i] + '\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" + tok.nextToken() + "\n");
return buf.toString();
}
/**
* @return deep copy of this class
*/
public JavaClass copy() {
JavaClass c = null;
try {
c = (JavaClass)clone();
} catch(CloneNotSupportedException e) {}
c.constant_pool = constant_pool.copy();
c.interfaces = (int[])interfaces.clone();
c.interface_names = (String[])interface_names.clone();
c.fields = new Field[fields.length];
for(int i=0; i < fields.length; i++)
c.fields[i] = fields[i].copy(c.constant_pool);
c.methods = new Method[methods.length];
for(int i=0; i < methods.length; i++)
c.methods[i] = methods[i].copy(c.constant_pool);
c.attributes = new Attribute[attributes.length];
for(int i=0; i < attributes.length; i++)
c.attributes[i] = attributes[i].copy(c.constant_pool);
return c;
}
public final boolean isSuper() {
return (access_flags & Constants.ACC_SUPER) != 0;
}
public final boolean isClass() {
return (access_flags & Constants.ACC_INTERFACE) == 0;
}
/** @return returns either HEAP (generated), FILE, or ZIP
*/
public final byte getSource() {
return source;
}
/********************* New repository functionality *********************/
/**
* Gets the ClassRepository which holds its definition. By default
* this is the same as SyntheticRepository.getInstance();
*/
public com.sun.org.apache.bcel.internal.util.Repository getRepository() {
return repository;
}
/**
* Sets the ClassRepository which loaded the JavaClass.
* Should be called immediately after parsing is done.
*/
public void setRepository(com.sun.org.apache.bcel.internal.util.Repository repository) {
this.repository = repository;
}
/** Equivalent to runtime "instanceof" operator.
*
* @return true if this JavaClass is derived from teh super class
*/
public final boolean instanceOf(JavaClass super_class) {
if(this.equals(super_class))
return true;
JavaClass[] super_classes = getSuperClasses();
for(int i=0; i < super_classes.length; i++) {
if(super_classes[i].equals(super_class)) {
return true;
}
}
if(super_class.isInterface()) {
return implementationOf(super_class);
}
return false;
}
/**
* @return true, if clazz is an implementation of interface inter
*/
public boolean implementationOf(JavaClass inter) {
if(!inter.isInterface()) {
throw new IllegalArgumentException(inter.getClassName() + " is no interface");
}
if(this.equals(inter)) {
return true;
}
JavaClass[] super_interfaces = getAllInterfaces();
for(int i=0; i < super_interfaces.length; i++) {
if(super_interfaces[i].equals(inter)) {
return true;
}
}
return false;
}
/**
* @return the superclass for this JavaClass object, or null if this
* is java.lang.Object
*/
public JavaClass getSuperClass() {
if("java.lang.Object".equals(getClassName())) {
return null;
}
try {
return repository.loadClass(getSuperclassName());
} catch(ClassNotFoundException e) {
System.err.println(e);
return null;
}
}
/**
* @return list of super classes of this class in ascending order, i.e.,
* java.lang.Object is always the last element
*/
public JavaClass[] getSuperClasses() {
JavaClass clazz = this;
ClassVector vec = new ClassVector();
for(clazz = clazz.getSuperClass(); clazz != null;
clazz = clazz.getSuperClass())
{
vec.addElement(clazz);
}
return vec.toArray();
}
/**
* Get interfaces directly implemented by this JavaClass.
*/
public JavaClass[] getInterfaces() {
String[] interfaces = getInterfaceNames();
JavaClass[] classes = new JavaClass[interfaces.length];
try {
for(int i = 0; i < interfaces.length; i++) {
classes[i] = repository.loadClass(interfaces[i]);
}
} catch(ClassNotFoundException e) {
System.err.println(e);
return null;
}
return classes;
}
/**
* Get all interfaces implemented by this JavaClass (transitively).
*/
public JavaClass[] getAllInterfaces() {
ClassQueue queue = new ClassQueue();
ClassVector vec = new ClassVector();
queue.enqueue(this);
while(!queue.empty()) {
JavaClass clazz = queue.dequeue();
JavaClass souper = clazz.getSuperClass();
JavaClass[] interfaces = clazz.getInterfaces();
if(clazz.isInterface()) {
vec.addElement(clazz);
} else {
if(souper != null) {
queue.enqueue(souper);
}
}
for(int i = 0; i < interfaces.length; i++) {
queue.enqueue(interfaces[i]);
}
}
return vec.toArray();
}
}