Mercurial > hg > blitz_stable
view src/com/go/trove/classfile/MethodInfo.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
children |
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/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. 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 * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * 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 WALT DISNEY INTERNET GROUP 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. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.classfile; import java.util.*; import java.io.*; import java.lang.reflect.Modifier; /****************************************************************************** * This class corresponds to the method_info data structure as defined in * section 4.6 of <i>The Java Virtual Machine Specification</i>. * To make it easier to create bytecode for a method's CodeAttr, the * CodeBuilder class is provided. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> * @see ClassFile * @see CodeBuilder */ public class MethodInfo { private ClassFile mParent; private ConstantPool mCp; private String mName; private MethodDescriptor mDesc; private int mAccessFlags; private ConstantUTFInfo mNameConstant; private ConstantUTFInfo mDescriptorConstant; private List mAttributes = new ArrayList(2); private CodeAttr mCode; private ExceptionsAttr mExceptions; MethodInfo(ClassFile parent, AccessFlags flags, String name, MethodDescriptor desc) { mParent = parent; mCp = parent.getConstantPool(); mName = name; mDesc = desc; mAccessFlags = flags.getModifier(); mNameConstant = ConstantUTFInfo.make(mCp, name); mDescriptorConstant = ConstantUTFInfo.make(mCp, desc.toString()); if (!flags.isAbstract()) { addAttribute(new CodeAttr(mCp)); } } private MethodInfo(ClassFile parent, int flags, ConstantUTFInfo nameConstant, ConstantUTFInfo descConstant) { mParent = parent; mCp = parent.getConstantPool(); mName = nameConstant.getValue(); mDesc = MethodDescriptor.parseMethodDesc(descConstant.getValue()); mAccessFlags = flags; mNameConstant = nameConstant; mDescriptorConstant = descConstant; } /** * Returns the parent ClassFile for this MethodInfo. */ public ClassFile getClassFile() { return mParent; } /** * Returns the name of this method. */ public String getName() { return mName; } /** * Returns a MethodDescriptor which describes return and parameter types * of this method. */ public MethodDescriptor getMethodDescriptor() { return mDesc; } /** * Returns a copy of this method's access flags. */ public AccessFlags getAccessFlags() { return new AccessFlags(mAccessFlags); } /** * Returns a constant from the constant pool with this method's name. */ public ConstantUTFInfo getNameConstant() { return mNameConstant; } /** * Returns a constant from the constant pool with this method's type * descriptor string. * @see TypeDescriptor */ public ConstantUTFInfo getDescriptorConstant() { return mDescriptorConstant; } /** * Returns the exceptions that this method is declared to throw. */ public String[] getExceptions() { if (mExceptions == null) { return new String[0]; } else { return mExceptions.getExceptions(); } } /** * Returns a CodeAttr object used to manipulate the method code body, or * null if this method is abstract. */ public CodeAttr getCodeAttr() { return mCode; } public boolean isSynthetic() { for (int i = mAttributes.size(); --i >= 0; ) { Object obj = mAttributes.get(i); if (obj instanceof SyntheticAttr) { return true; } } return false; } public boolean isDeprecated() { for (int i = mAttributes.size(); --i >= 0; ) { Object obj = mAttributes.get(i); if (obj instanceof DeprecatedAttr) { return true; } } return false; } /** * Add a declared exception that this method may throw. */ public void addException(String className) { if (mExceptions == null) { addAttribute(new ExceptionsAttr(mCp)); } ConstantClassInfo cci = ConstantClassInfo.make(mCp, className); mExceptions.addException(cci); } /** * Mark this method as being synthetic by adding a special attribute. */ public void markSynthetic() { addAttribute(new SyntheticAttr(mCp)); } /** * Mark this method as being deprecated by adding a special attribute. */ public void markDeprecated() { addAttribute(new DeprecatedAttr(mCp)); } public void addAttribute(Attribute attr) { if (attr instanceof CodeAttr) { if (mCode != null) { mAttributes.remove(mCode); } mCode = (CodeAttr)attr; } else if (attr instanceof ExceptionsAttr) { if (mExceptions != null) { mAttributes.remove(mExceptions); } mExceptions = (ExceptionsAttr)attr; } mAttributes.add(attr); } public Attribute[] getAttributes() { Attribute[] attrs = new Attribute[mAttributes.size()]; return (Attribute[])mAttributes.toArray(attrs); } /** * Returns the length (in bytes) of this object in the class file. */ public int getLength() { int length = 8; int size = mAttributes.size(); for (int i=0; i<size; i++) { length += ((Attribute)mAttributes.get(i)).getLength(); } return length; } public void writeTo(DataOutput dout) throws IOException { dout.writeShort(mAccessFlags); dout.writeShort(mNameConstant.getIndex()); dout.writeShort(mDescriptorConstant.getIndex()); int size = mAttributes.size(); dout.writeShort(size); for (int i=0; i<size; i++) { Attribute attr = (Attribute)mAttributes.get(i); attr.writeTo(dout); } } public String toString() { String modStr = Modifier.toString(mAccessFlags); if (modStr.length() == 0) { return String.valueOf(mDesc) + ' ' + getName(); } else { return modStr + ' ' + mDesc + ' ' + getName(); } } static MethodInfo readFrom(ClassFile parent, DataInput din, AttributeFactory attrFactory) throws IOException { ConstantPool cp = parent.getConstantPool(); int flags = din.readUnsignedShort(); int index = din.readUnsignedShort(); ConstantUTFInfo nameConstant = (ConstantUTFInfo)cp.getConstant(index); index = din.readUnsignedShort(); ConstantUTFInfo descConstant = (ConstantUTFInfo)cp.getConstant(index); MethodInfo info = new MethodInfo(parent, flags, nameConstant, descConstant); // Read attributes. int size = din.readUnsignedShort(); for (int i=0; i<size; i++) { info.addAttribute(Attribute.readFrom(cp, din, attrFactory)); } return info; } }