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232 lines
7.6 KiB
232 lines
7.6 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.classfile;
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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.generic.Type;
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import java.io.*;
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/**
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* This class represents the method info structure, i.e., the representation
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* for a method in the class. See JVM specification for details.
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* A method has access flags, a name, a signature and a number of attributes.
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*
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* @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
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*/
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public final class Method extends FieldOrMethod {
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/**
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* Empty constructor, all attributes have to be defined via `setXXX'
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* methods. Use at your own risk.
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*/
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public Method() {}
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/**
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* Initialize from another object. Note that both objects use the same
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* references (shallow copy). Use clone() for a physical copy.
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*/
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public Method(Method c) {
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super(c);
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}
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/**
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* Construct object from file stream.
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* @param file Input stream
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* @throws IOException
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* @throws ClassFormatException
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*/
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Method(DataInputStream file, ConstantPool constant_pool)
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throws IOException, ClassFormatException
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{
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super(file, constant_pool);
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}
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/**
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* @param access_flags Access rights of method
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* @param name_index Points to field name in constant pool
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* @param signature_index Points to encoded signature
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* @param attributes Collection of attributes
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* @param constant_pool Array of constants
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*/
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public Method(int access_flags, int name_index, int signature_index,
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Attribute[] attributes, ConstantPool constant_pool)
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{
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super(access_flags, name_index, signature_index, attributes, constant_pool);
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}
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/**
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* Called by objects that are traversing the nodes of the tree implicitely
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* defined by the contents of a Java class. I.e., the hierarchy of methods,
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* fields, attributes, etc. spawns a tree of objects.
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*
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* @param v Visitor object
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*/
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public void accept(Visitor v) {
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v.visitMethod(this);
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}
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/**
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* @return Code attribute of method, if any
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*/
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public final Code getCode() {
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for(int i=0; i < attributes_count; i++)
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if(attributes[i] instanceof Code)
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return (Code)attributes[i];
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return null;
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}
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/**
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* @return ExceptionTable attribute of method, if any, i.e., list all
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* exceptions the method may throw not exception handlers!
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*/
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public final ExceptionTable getExceptionTable() {
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for(int i=0; i < attributes_count; i++)
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if(attributes[i] instanceof ExceptionTable)
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return (ExceptionTable)attributes[i];
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return null;
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}
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/** @return LocalVariableTable of code attribute if any, i.e. the call is forwarded
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* to the Code atribute.
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*/
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public final LocalVariableTable getLocalVariableTable() {
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Code code = getCode();
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if(code != null)
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return code.getLocalVariableTable();
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else
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return null;
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}
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/** @return LineNumberTable of code attribute if any, i.e. the call is forwarded
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* to the Code atribute.
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*/
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public final LineNumberTable getLineNumberTable() {
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Code code = getCode();
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if(code != null)
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return code.getLineNumberTable();
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else
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return null;
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}
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/**
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* Return string representation close to declaration format,
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* `public static void _main(String[] args) throws IOException', e.g.
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*
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* @return String representation of the method.
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*/
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public final String toString() {
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ConstantUtf8 c;
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String name, signature, access; // Short cuts to constant pool
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StringBuffer buf;
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access = Utility.accessToString(access_flags);
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// Get name and signature from constant pool
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c = (ConstantUtf8)constant_pool.getConstant(signature_index,
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Constants.CONSTANT_Utf8);
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signature = c.getBytes();
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c = (ConstantUtf8)constant_pool.getConstant(name_index, Constants.CONSTANT_Utf8);
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name = c.getBytes();
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signature = Utility.methodSignatureToString(signature, name, access, true,
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getLocalVariableTable());
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buf = new StringBuffer(signature);
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for(int i=0; i < attributes_count; i++) {
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Attribute a = attributes[i];
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if(!((a instanceof Code) || (a instanceof ExceptionTable)))
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buf.append(" [" + a.toString() + "]");
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}
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ExceptionTable e = getExceptionTable();
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if(e != null) {
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String str = e.toString();
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if(!str.equals(""))
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buf.append("\n\t\tthrows " + str);
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}
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return buf.toString();
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}
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/**
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* @return deep copy of this method
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*/
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public final Method copy(ConstantPool constant_pool) {
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return (Method)copy_(constant_pool);
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}
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/**
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* @return return type of method
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*/
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public Type getReturnType() {
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return Type.getReturnType(getSignature());
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}
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/**
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* @return array of method argument types
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*/
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public Type[] getArgumentTypes() {
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return Type.getArgumentTypes(getSignature());
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}
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}
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