/**
* Read a constant from the constant pool.
*
* @param in The stream from which to read.
* @return The constant.
* @exception IOException If an error occurs while reading.
*/
Constant readConstant(DataInputStream in) throws IOException {
int tag = in.readUnsignedByte();
Object value;
switch (tag) {
case Constant.CLASS:
case Constant.STRING:
case Constant.METHOD_TYPE: // @since 1.8
value = Integer.valueOf(in.readUnsignedShort());
break;
case Constant.FIELD_REF:
case Constant.METHOD_REF:
case Constant.INTERFACE_METHOD_REF:
case Constant.NAME_AND_TYPE:
case Constant.INVOKE_DYNAMIC: // @since 1.8
value = new int[2];
((int[]) value)[0] = in.readUnsignedShort();
((int[]) value)[1] = in.readUnsignedShort();
break;
case Constant.INTEGER:
value = Integer.valueOf(in.readInt());
break;
case Constant.FLOAT:
value = Float.valueOf(in.readFloat());
break;
case Constant.LONG:
// Longs take up 2 constant pool entries.
value = Long.valueOf(in.readLong());
break;
case Constant.DOUBLE:
// Doubles take up 2 constant pool entries.
value = Double.valueOf(in.readDouble());
break;
case Constant.UTF8:
value = in.readUTF();
break;
case Constant.METHOD_HANDLE: // @since 1.8
value = new int[2];
((int[]) value)[0] = in.readUnsignedByte();
((int[]) value)[1] = in.readUnsignedShort();
break;
default:
throw new ClassFormatError("Invalid constant tag: " + tag);
}
return new Constant(tag, value);
}
