/*

  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package org.apidesign.javap;

 import java.io.ByteArrayInputStream;

 import java.io.DataInputStream;

 import java.io.IOException;

 /** An abstract parser for annotation definitions. Analyses the bytes and

  * performs some callbacks to the overriden parser methods.

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 public class AnnotationParser {

     protected AnnotationParser() {

     }

     protected void visitAnnotationStart(String type) throws IOException {

     }

     protected void visitAnnotationEnd(String type) throws IOException {

     }

     protected void visitAttr(

         String annoType, String attr, String attrType, String value

     ) throws IOException {

     }

     /** Initialize the parsing with constant pool from <code>cd</code>.

      * 

      * @param attr the attribute defining annotations

      * @param cd constant pool

      * @throws IOException in case I/O fails

      */

     public final void parse(byte[] attr, ClassData cd) throws IOException {

         ByteArrayInputStream is = new ByteArrayInputStream(attr);

         DataInputStream dis = new DataInputStream(is);

         try {

             read(dis, cd);

         } finally {

             is.close();

         }

     }

     private void read(DataInputStream dis, ClassData cd) throws IOException {

     	int cnt = dis.readUnsignedShort();

         for (int i = 0; i < cnt; i++) {

             readAnno(dis, cd);

         }

     }

     private void readAnno(DataInputStream dis, ClassData cd) throws IOException {

         int type = dis.readUnsignedShort();

         String typeName = cd.StringValue(type);

         visitAnnotationStart(typeName);

     	int cnt = dis.readUnsignedShort();

     	for (int i = 0; i < cnt; i++) {

             String attrName = cd.StringValue(dis.readUnsignedShort());

             readValue(dis, cd, typeName, attrName);

         }

         visitAnnotationEnd(typeName);

     }

     private void readValue(DataInputStream dis, ClassData cd, String typeName, String attrName) 

     throws IOException {

         char type = (char)dis.readByte();

         if (type == '@') {

             readAnno(dis, cd);

         } else if ("CFJZsSIDB".indexOf(type) >= 0) { // NOI18N

             int primitive = dis.readUnsignedShort();

             String attrType;

             if (type == 's') {

                 attrType = "Ljava_lang_String";

             } else {

                 attrType = "" + type;

             }

             visitAttr(typeName, attrName, attrType, cd.StringValue(primitive));

         } else if (type == 'c') {

             int cls = dis.readUnsignedShort();

         } else if (type == '[') {

             int cnt = dis.readUnsignedShort();

             for (int i = 0; i < cnt; i++) {

                 readValue(dis, cd, typeName, attrName);

             }

         } else if (type == 'e') {

             int enumT = dis.readUnsignedShort();

             int enumN = dis.readUnsignedShort();

         } else {

             throw new IOException("Unknown type " + type);

         }

     }

 }