Mercurial > hg > blitz_condensed
diff src/com/go/trove/classfile/MethodDescriptor.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/MethodDescriptor.java Sat Mar 21 11:00:06 2009 +0000 @@ -0,0 +1,203 @@ +/* ==================================================================== + * 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.List; +import java.util.ArrayList; + +/****************************************************************************** + * This class is used to build method descriptor strings as + * defined in <i>The Java Virtual Machine Specification</i>, section 4.3.3. + * + * @author Brian S O'Neill + * @version + * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> + */ +public class MethodDescriptor extends Descriptor { + private static TypeDescriptor[] cEmptyParams = new TypeDescriptor[0]; + + private String mStr; + private TypeDescriptor mRetType; + private TypeDescriptor[] mParams; + + public MethodDescriptor() { + this(null, null); + } + + /** + * Used to construct a method descriptor for a method with a return + * type and parameters. + */ + public MethodDescriptor(TypeDescriptor ret, TypeDescriptor[] params) { + if (params == null) { + params = cEmptyParams; + } + + mStr = generate(ret, params); + mRetType = ret; + mParams = params; + } + + public TypeDescriptor getReturnType() { + return mRetType; + } + + public int getParameterCount() { + return mParams.length; + } + + public TypeDescriptor[] getParameterTypes() { + return mParams; + } + + public String toString() { + return mStr; + } + + public static String generate() { + return generate(null, null); + } + + /** + * Used to generate a method descriptor for a method with a return + * type and parameters. + */ + public static String generate(TypeDescriptor ret, + TypeDescriptor[] params) { + + StringBuffer desc = new StringBuffer(20); + + desc.append('('); + + if (params != null) { + for (int i=0; i<params.length; i++) { + desc.append(params[i]); + } + } + + desc.append(')'); + + if (ret == null) ret = new TypeDescriptor(Void.TYPE); + desc.append(ret); + + return desc.toString(); + } + + public static MethodDescriptor parseMethodDesc(String desc) + throws IllegalArgumentException { + + MethodDescriptor md; + int cursor = 0; + try { + char c; + + if ((c = desc.charAt(cursor++)) != '(') { + throw new IllegalArgumentException + ("Invalid descriptor: " + desc); + } + + StringBuffer buf = new StringBuffer(); + List list = new ArrayList(); + + while ((c = desc.charAt(cursor++)) != ')') { + switch (c) { + case 'V': + case 'I': + case 'C': + case 'Z': + case 'D': + case 'F': + case 'J': + case 'B': + case 'S': + buf.append(c); + break; + case '[': + buf.append(c); + continue; + case 'L': + while (true) { + buf.append(c); + if (c == ';') { + break; + } + c = desc.charAt(cursor++); + } + break; + default: + throw new IllegalArgumentException + ("Invalid descriptor: " + desc); + } + + list.add(TypeDescriptor.parseTypeDesc(buf.toString())); + buf.setLength(0); + } + + TypeDescriptor ret = + TypeDescriptor.parseTypeDesc(desc.substring(cursor)); + + TypeDescriptor[] tds = new TypeDescriptor[list.size()]; + tds = (TypeDescriptor[])list.toArray(tds); + + md = new MethodDescriptor(ret, tds); + } + catch (NullPointerException e) { + throw new IllegalArgumentException("Invalid descriptor: " + desc); + } + catch (IndexOutOfBoundsException e) { + throw new IllegalArgumentException("Invalid descriptor: " + desc); + } + + return md; + } +}