How to use

getTag

method

in

org.apache.bcel.classfile.Constant

@Override
public void visitConstantPool(ConstantPool obj) {
  super.visitConstantPool(obj);
  Constant[] constant_pool = obj.getConstantPool();
  for (int i = 1; i < constant_pool.length; i++) {
    constant_pool[i].accept(this);
    byte tag = constant_pool[i].getTag();
    if ((tag == Const.CONSTANT_Double) || (tag == Const.CONSTANT_Long)) {
      i++;
    }
  }
}

String str;
int i, j, k;
byte tag = c.getTag();

/**
 * Dump constant package to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(name_index);
}

/**
 * Dump String in Utf8 format to file stream.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeUTF(bytes);
}

/**
 * Dump constant field reference to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(string_index);
}

/**
 * Dump name and signature index to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(descriptor_index);
}

/**
 * Dumps constant class to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException if an I/O error occurs writing to the DataOutputStream.
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(name_index);
}

/**
 * Dump constant float to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeFloat(bytes);
}

/**
 * Dump constant module to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(name_index);
}

/**
 * Dump constant double to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeDouble(bytes);
}

/**
 * Dump constant integer to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeInt(bytes);
}

/**
 * Dump constant long to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeLong(bytes);
}

/**
 * Dump constant field reference to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(class_index);
  file.writeShort(name_and_type_index);
}

/**
 * Dump name and signature index to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeShort(name_index);
  file.writeShort(signature_index);
}

/**
 * Dump method kind and index to file stream in binary format.
 *
 * @param file Output file stream
 * @throws IOException
 */
@Override
public final void dump( final DataOutputStream file ) throws IOException {
  file.writeByte(super.getTag());
  file.writeByte(reference_kind);
  file.writeShort(reference_index);
}

public Type getType(ConstantPoolGen cpg) {
 switch(cpg.getConstantPool().getConstant(index).getTag()) {
 case org.apache.bcel.Constants.CONSTANT_Long:   return Type.LONG;
 case org.apache.bcel.Constants.CONSTANT_Double: return Type.DOUBLE;
 default: // Never reached
  throw new RuntimeException("Unknown constant type " + opcode);
 }
}

public Type getType(ConstantPoolGen cpg) {
 switch(cpg.getConstantPool().getConstant(index).getTag()) {
 case org.apache.bcel.Constants.CONSTANT_String:  return Type.STRING;
 case org.apache.bcel.Constants.CONSTANT_Float:   return Type.FLOAT;
 case org.apache.bcel.Constants.CONSTANT_Integer: return Type.INT;
 default: // Never reached
  throw new RuntimeException("Unknown or invalid constant type at " + index);
 }
}

@Override
public Type getType( final ConstantPoolGen cpg ) {
  switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
    case org.apache.bcel.Const.CONSTANT_Long:
      return Type.LONG;
    case org.apache.bcel.Const.CONSTANT_Double:
      return Type.DOUBLE;
    default: // Never reached
      throw new RuntimeException("Unknown constant type " + super.getOpcode());
  }
}

@Override
public void visitConstantPool(ConstantPool obj) {
  super.visitConstantPool(obj);
  Constant[] constant_pool = obj.getConstantPool();
  for (int i = 1; i < constant_pool.length; i++) {
    constant_pool[i].accept(this);
    byte tag = constant_pool[i].getTag();
    if ((tag == CONSTANT_Double) || (tag == CONSTANT_Long)) {
      i++;
    }
  }
}

public Number getValue( final ConstantPoolGen cpg ) {
  final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
  switch (c.getTag()) {
    case org.apache.bcel.Const.CONSTANT_Long:
      return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
    case org.apache.bcel.Const.CONSTANT_Double:
      return new Double(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
    default: // Never reached
      throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex());
  }
}