/**
    * Copyright 2007 Google Inc.
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.tonicsystems.jarjar;
  
  import org.objectweb.asm.*;
  
  abstract class StringReader extends ClassVisitor
  {
      private int line = -1;
      private String className;
  
      public StringReader() {
          super(Opcodes.ASM4);
      }
      
      abstract public void visitString(String className, String value, int line);
  
      private void handleObject(Object value) {
          if (value instanceof String)
              visitString(className, (String)value, line);
      }
      
      @Override
      public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
          className = name;
          line = -1;
      }
  
      public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
          handleObject(value);
          return new FieldVisitor(Opcodes.ASM4){
              @Override
              public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
                  return StringReader.this.visitAnnotation(desc, visible);
              }
          };
      }
      
      @Override
      public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
          return new AnnotationVisitor(Opcodes.ASM4) {
              @Override
              public void visit(String name, Object value) {
                  handleObject(value);
              }
              @Override
              public void visitEnum(String name, String desc, String value) {
                  handleObject(value);
              }
              @Override
              public AnnotationVisitor visitAnnotation(String name, String desc) {
                  return this;
              }
          };
      }
      
      @Override
      public MethodVisitor visitMethod(int access, String name, String desc,
              String signature, String[] exceptions) {
          MethodVisitor mv = new MethodVisitor(Opcodes.ASM4){
              @Override
              public void visitLdcInsn(Object cst) {
                  handleObject(cst);
              }
              @Override
              public void visitLineNumber(int line, Label start) {
                  StringReader.this.line = line;
              }
              @Override
              public void visitInvokeDynamicInsn(String name, String desc,
                      Handle bsm, Object... bsmArgs) {
                  for (Object bsmArg : bsmArgs) handleObject(bsmArg);
              }
              @Override
              public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
                  return StringReader.this.visitAnnotation(desc, visible);
              }
              @Override
              public AnnotationVisitor visitParameterAnnotation(int parameter,
                      String desc, boolean visible) {
                  return StringReader.this.visitAnnotation(desc, visible);
              }
          };
          return mv;
      }
 }