Mercurial > hg > blitz_condensed
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/go/trove/classfile/Attribute.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,220 @@ +/* ==================================================================== + * 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); + } + }; + } + } +}