Mercurial > hg > blitz_condensed
view src/com/go/trove/classfile/Attribute.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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.io.*; /****************************************************************************** * This class corresponds to the attribute_info structure defined in section * 4.7 of <i>The Java Virtual Machine Specification</i>. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> * @see ClassFile */ public abstract class Attribute { final static Attribute[] NO_ATTRIBUTES = new Attribute[0]; final static String CODE = "Code"; final static String CONSTANT_VALUE = "ConstantValue"; final static String DEPRECATED = "Deprecated"; final static String EXCEPTIONS = "Exceptions"; final static String INNER_CLASSES = "InnerClasses"; final static String LINE_NUMBER_TABLE = "LineNumberTable"; final static String LOCAL_VARIABLE_TABLE = "LocalVariableTable"; final static String SOURCE_FILE = "SourceFile"; final static String SYNTHETIC = "Synthetic"; /** The ConstantPool that this attribute is defined against. */ protected final ConstantPool mCp; private String mName; private ConstantUTFInfo mNameConstant; protected Attribute(ConstantPool cp, String name) { mCp = cp; mName = name; mNameConstant = ConstantUTFInfo.make(cp, name); } /** * Returns the ConstantPool that this attribute is defined against. */ public ConstantPool getConstantPool() { return mCp; } /** * Returns the name of this attribute. */ public String getName() { return mName; } public ConstantUTFInfo getNameConstant() { return mNameConstant; } /** * Some attributes have sub-attributes. Default implementation returns an * empty array. */ public Attribute[] getAttributes() { return NO_ATTRIBUTES; } /** * Returns the length (in bytes) of this attribute in the class file. */ public abstract int getLength(); /** * This method writes the 16 bit name constant index followed by the * 32 bit attribute length, followed by the attribute specific data. */ public final void writeTo(DataOutput dout) throws IOException { dout.writeShort(mNameConstant.getIndex()); dout.writeInt(getLength()); writeDataTo(dout); } /** * Write just the attribute specific data. The default implementation * writes nothing. */ public void writeDataTo(DataOutput dout) throws IOException { } /** * @param attrFactory optional factory for reading custom attributes */ public static Attribute readFrom(ConstantPool cp, DataInput din, AttributeFactory attrFactory) throws IOException { int index = din.readUnsignedShort(); String name = ((ConstantUTFInfo)cp.getConstant(index)).getValue(); int length = din.readInt(); attrFactory = new Factory(attrFactory); return attrFactory.createAttribute(cp, name, length, din); } private static class Factory implements AttributeFactory { private final AttributeFactory mAttrFactory; public Factory(AttributeFactory attrFactory) { mAttrFactory = attrFactory; } public Attribute createAttribute(ConstantPool cp, String name, final int length, DataInput din) throws IOException { if (name.equals(CODE)) { return CodeAttr.define(cp, name, length, din, mAttrFactory); } else if (name.equals(CONSTANT_VALUE)) { return ConstantValueAttr.define(cp, name, length, din); } else if (name.equals(DEPRECATED)) { return DeprecatedAttr.define(cp, name, length, din); } else if (name.equals(EXCEPTIONS)) { return ExceptionsAttr.define(cp, name, length, din); } else if (name.equals(INNER_CLASSES)) { return InnerClassesAttr.define(cp, name, length, din); } else if (name.equals(LINE_NUMBER_TABLE)) { return LineNumberTableAttr.define(cp, name, length, din); } else if (name.equals(LOCAL_VARIABLE_TABLE)) { return LocalVariableTableAttr.define (cp, name, length, din); } else if (name.equals(SOURCE_FILE)) { return SourceFileAttr.define(cp, name, length, din); } else if (name.equals(SYNTHETIC)) { return SyntheticAttr.define(cp, name, length, din); } if (mAttrFactory != null) { Attribute attr = mAttrFactory.createAttribute(cp, name, length, din); if (attr != null) { return attr; } } // Default case, return attribute that captures the data, but // doesn't decode it. final byte[] data = new byte[length]; din.readFully(data); return new Attribute(cp, name) { public int getLength() { return length; } public void writeDataTo(DataOutput dout) throws IOException { dout.write(data); } }; } } }