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455 lines
15 KiB
455 lines
15 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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package com.sun.org.apache.bcel.internal.generic;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2001 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" and
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* "Apache BCEL" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* "Apache BCEL", nor may "Apache" appear in their name, without
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* prior written permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import com.sun.org.apache.bcel.internal.Constants;
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import com.sun.org.apache.bcel.internal.classfile.*;
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import java.util.ArrayList;
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import java.util.Iterator;
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/**
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* Template class for building up a java class. May be initialized with an
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* existing java class (file).
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*
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* @see JavaClass
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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*/
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public class ClassGen extends AccessFlags implements Cloneable {
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/* Corresponds to the fields found in a JavaClass object.
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*/
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private String class_name, super_class_name, file_name;
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private int class_name_index = -1, superclass_name_index = -1;
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private int major = Constants.MAJOR_1_1, minor = Constants.MINOR_1_1;
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private ConstantPoolGen cp; // Template for building up constant pool
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// ArrayLists instead of arrays to gather fields, methods, etc.
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private ArrayList field_vec = new ArrayList();
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private ArrayList method_vec = new ArrayList();
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private ArrayList attribute_vec = new ArrayList();
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private ArrayList interface_vec = new ArrayList();
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/** Convenience constructor to set up some important values initially.
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*
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* @param class_name fully qualified class name
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* @param super_class_name fully qualified superclass name
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* @param file_name source file name
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* @param access_flags access qualifiers
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* @param interfaces implemented interfaces
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* @param cp constant pool to use
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*/
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public ClassGen(String class_name, String super_class_name, String file_name,
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int access_flags, String[] interfaces, ConstantPoolGen cp) {
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this.class_name = class_name;
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this.super_class_name = super_class_name;
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this.file_name = file_name;
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this.access_flags = access_flags;
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this.cp = cp;
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// Put everything needed by default into the constant pool and the vectors
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if(file_name != null)
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addAttribute(new SourceFile(cp.addUtf8("SourceFile"), 2,
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cp.addUtf8(file_name), cp.getConstantPool()));
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class_name_index = cp.addClass(class_name);
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superclass_name_index = cp.addClass(super_class_name);
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if(interfaces != null)
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for(int i=0; i < interfaces.length; i++)
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addInterface(interfaces[i]);
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}
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/** Convenience constructor to set up some important values initially.
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*
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* @param class_name fully qualified class name
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* @param super_class_name fully qualified superclass name
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* @param file_name source file name
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* @param access_flags access qualifiers
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* @param interfaces implemented interfaces
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*/
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public ClassGen(String class_name, String super_class_name, String file_name,
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int access_flags, String[] interfaces) {
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this(class_name, super_class_name, file_name, access_flags, interfaces,
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new ConstantPoolGen());
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}
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/**
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* Initialize with existing class.
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* @param clazz JavaClass object (e.g. read from file)
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*/
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public ClassGen(JavaClass clazz) {
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class_name_index = clazz.getClassNameIndex();
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superclass_name_index = clazz.getSuperclassNameIndex();
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class_name = clazz.getClassName();
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super_class_name = clazz.getSuperclassName();
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file_name = clazz.getSourceFileName();
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access_flags = clazz.getAccessFlags();
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cp = new ConstantPoolGen(clazz.getConstantPool());
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major = clazz.getMajor();
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minor = clazz.getMinor();
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Attribute[] attributes = clazz.getAttributes();
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Method[] methods = clazz.getMethods();
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Field[] fields = clazz.getFields();
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String[] interfaces = clazz.getInterfaceNames();
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for(int i=0; i < interfaces.length; i++)
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addInterface(interfaces[i]);
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for(int i=0; i < attributes.length; i++)
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addAttribute(attributes[i]);
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for(int i=0; i < methods.length; i++)
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addMethod(methods[i]);
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for(int i=0; i < fields.length; i++)
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addField(fields[i]);
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}
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/**
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* @return the (finally) built up Java class object.
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*/
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public JavaClass getJavaClass() {
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int[] interfaces = getInterfaces();
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Field[] fields = getFields();
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Method[] methods = getMethods();
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Attribute[] attributes = getAttributes();
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// Must be last since the above calls may still add something to it
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ConstantPool cp = this.cp.getFinalConstantPool();
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return new JavaClass(class_name_index, superclass_name_index,
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file_name, major, minor, access_flags,
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cp, interfaces, fields, methods, attributes);
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}
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/**
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* Add an interface to this class, i.e., this class has to implement it.
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* @param name interface to implement (fully qualified class name)
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*/
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public void addInterface(String name) {
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interface_vec.add(name);
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}
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/**
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* Remove an interface from this class.
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* @param name interface to remove (fully qualified name)
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*/
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public void removeInterface(String name) {
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interface_vec.remove(name);
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}
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/**
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* @return major version number of class file
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*/
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public int getMajor() { return major; }
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/** Set major version number of class file, default value is 45 (JDK 1.1)
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* @param major major version number
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*/
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public void setMajor(int major) {
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this.major = major;
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}
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/** Set minor version number of class file, default value is 3 (JDK 1.1)
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* @param minor minor version number
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*/
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public void setMinor(int minor) {
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this.minor = minor;
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}
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/**
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* @return minor version number of class file
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*/
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public int getMinor() { return minor; }
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/**
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* Add an attribute to this class.
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* @param a attribute to add
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*/
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public void addAttribute(Attribute a) { attribute_vec.add(a); }
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/**
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* Add a method to this class.
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* @param m method to add
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*/
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public void addMethod(Method m) { method_vec.add(m); }
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/**
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* Convenience method.
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*
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* Add an empty constructor to this class that does nothing but calling super().
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* @param access rights for constructor
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*/
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public void addEmptyConstructor(int access_flags) {
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InstructionList il = new InstructionList();
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il.append(InstructionConstants.THIS); // Push `this'
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il.append(new INVOKESPECIAL(cp.addMethodref(super_class_name,
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"<init>", "()V")));
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il.append(InstructionConstants.RETURN);
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MethodGen mg = new MethodGen(access_flags, Type.VOID, Type.NO_ARGS, null,
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"<init>", class_name, il, cp);
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mg.setMaxStack(1);
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addMethod(mg.getMethod());
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}
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/**
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* Add a field to this class.
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* @param f field to add
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*/
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public void addField(Field f) { field_vec.add(f); }
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public boolean containsField(Field f) { return field_vec.contains(f); }
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/** @return field object with given name, or null
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*/
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public Field containsField(String name) {
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for(Iterator e=field_vec.iterator(); e.hasNext(); ) {
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Field f = (Field)e.next();
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if(f.getName().equals(name))
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return f;
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}
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return null;
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}
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/** @return method object with given name and signature, or null
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*/
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public Method containsMethod(String name, String signature) {
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for(Iterator e=method_vec.iterator(); e.hasNext();) {
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Method m = (Method)e.next();
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if(m.getName().equals(name) && m.getSignature().equals(signature))
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return m;
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}
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return null;
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}
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/**
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* Remove an attribute from this class.
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* @param a attribute to remove
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*/
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public void removeAttribute(Attribute a) { attribute_vec.remove(a); }
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/**
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* Remove a method from this class.
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* @param m method to remove
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*/
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public void removeMethod(Method m) { method_vec.remove(m); }
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/** Replace given method with new one. If the old one does not exist
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* add the new_ method to the class anyway.
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*/
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public void replaceMethod(Method old, Method new_) {
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if(new_ == null)
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throw new ClassGenException("Replacement method must not be null");
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int i = method_vec.indexOf(old);
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if(i < 0)
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method_vec.add(new_);
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else
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method_vec.set(i, new_);
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}
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/** Replace given field with new one. If the old one does not exist
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* add the new_ field to the class anyway.
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*/
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public void replaceField(Field old, Field new_) {
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if(new_ == null)
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throw new ClassGenException("Replacement method must not be null");
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int i = field_vec.indexOf(old);
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if(i < 0)
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field_vec.add(new_);
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else
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field_vec.set(i, new_);
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}
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/**
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* Remove a field to this class.
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* @param f field to remove
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*/
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public void removeField(Field f) { field_vec.remove(f); }
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public String getClassName() { return class_name; }
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public String getSuperclassName() { return super_class_name; }
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public String getFileName() { return file_name; }
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public void setClassName(String name) {
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class_name = name.replace('/', '.');
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class_name_index = cp.addClass(name);
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}
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public void setSuperclassName(String name) {
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super_class_name = name.replace('/', '.');
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superclass_name_index = cp.addClass(name);
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}
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public Method[] getMethods() {
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Method[] methods = new Method[method_vec.size()];
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method_vec.toArray(methods);
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return methods;
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}
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public void setMethods(Method[] methods) {
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method_vec.clear();
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for(int m=0; m<methods.length; m++)
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addMethod(methods[m]);
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}
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public void setMethodAt(Method method, int pos) {
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method_vec.set(pos, method);
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}
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public Method getMethodAt(int pos) {
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return (Method)method_vec.get(pos);
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}
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public String[] getInterfaceNames() {
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int size = interface_vec.size();
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String[] interfaces = new String[size];
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interface_vec.toArray(interfaces);
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return interfaces;
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}
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public int[] getInterfaces() {
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int size = interface_vec.size();
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int[] interfaces = new int[size];
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for(int i=0; i < size; i++)
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interfaces[i] = cp.addClass((String)interface_vec.get(i));
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return interfaces;
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}
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public Field[] getFields() {
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Field[] fields = new Field[field_vec.size()];
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field_vec.toArray(fields);
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return fields;
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}
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public Attribute[] getAttributes() {
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Attribute[] attributes = new Attribute[attribute_vec.size()];
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attribute_vec.toArray(attributes);
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return attributes;
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}
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public ConstantPoolGen getConstantPool() { return cp; }
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public void setConstantPool(ConstantPoolGen constant_pool) {
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cp = constant_pool;
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}
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public void setClassNameIndex(int class_name_index) {
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this.class_name_index = class_name_index;
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class_name = cp.getConstantPool().
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getConstantString(class_name_index, Constants.CONSTANT_Class).replace('/', '.');
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}
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public void setSuperclassNameIndex(int superclass_name_index) {
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this.superclass_name_index = superclass_name_index;
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super_class_name = cp.getConstantPool().
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getConstantString(superclass_name_index, Constants.CONSTANT_Class).replace('/', '.');
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}
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public int getSuperclassNameIndex() { return superclass_name_index; }
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public int getClassNameIndex() { return class_name_index; }
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private ArrayList observers;
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/** Add observer for this object.
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*/
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public void addObserver(ClassObserver o) {
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if(observers == null)
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observers = new ArrayList();
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observers.add(o);
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}
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/** Remove observer for this object.
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*/
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public void removeObserver(ClassObserver o) {
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if(observers != null)
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observers.remove(o);
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}
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/** Call notify() method on all observers. This method is not called
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* automatically whenever the state has changed, but has to be
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* called by the user after he has finished editing the object.
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*/
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public void update() {
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if(observers != null)
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for(Iterator e = observers.iterator(); e.hasNext(); )
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((ClassObserver)e.next()).notify(this);
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}
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public Object clone() {
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try {
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return super.clone();
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} catch(CloneNotSupportedException e) {
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System.err.println(e);
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return null;
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}
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}
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}
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