content: /*
   * Copyright (c) 2005, 2021, 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 openjdk.tools.javac.util;
  
  import openjdk.tools.javac.code.Type;
  
  /**
   * Utilities for operating on constant values.
   *
   * <p><b>This is NOT part of any supported API.
   * If you write code that depends on this, you do so at your own risk.
   * This code and its internal interfaces are subject to change or
   * deletion without notice.</b>
   */
  public class Constants {
  
      /**
       * Converts a constant in internal representation (in which
       * boolean, char, byte, short, and int are each represented by an
       * Integer) into standard representation.  Other values (including
       * null) are returned unchanged.
       */
      public static Object decode(Object value, Type type) {
          if (value instanceof Integer) {
              int i = (Integer)value;
              switch (type.getTag()) {
              case BOOLEAN:  return i != 0;
              case CHAR:     return (char) i;
              case BYTE:     return (byte) i;
              case SHORT:    return (short) i;
              }
          }
          return value;
      }
  
      /**
       * Returns a string representation of a constant value (given in
       * internal representation), quoted and formatted as in Java source.
       */
      public static String format(Object value, Type type) {
          value = decode(value, type);
          switch (type.getTag()) {
          case BYTE:      return formatByte((Byte) value);
          case LONG:      return formatLong((Long) value);
          case FLOAT:     return formatFloat((Float) value);
          case DOUBLE:    return formatDouble((Double) value);
          case CHAR:      return formatChar((Character) value);
          }
          if (value instanceof String)
              return formatString((String)value);
          return value + "";
      }
  
      /**
       * Returns a string representation of a constant value (given in
       * standard wrapped representation), quoted and formatted as in
       * Java source.
       */
      public static String format(Object value) {
          if (value instanceof Byte)      return formatByte((Byte) value);
          if (value instanceof Short)     return formatShort((Short) value);
          if (value instanceof Long)      return formatLong((Long) value);
          if (value instanceof Float)     return formatFloat((Float) value);
          if (value instanceof Double)    return formatDouble((Double) value);
          if (value instanceof Character) return formatChar((Character) value);
          if (value instanceof String)    return formatString((String) value);
          if (value instanceof Integer ||
              value instanceof Boolean)   return value.toString();
          else
              throw new IllegalArgumentException("Argument is not a primitive type or a string; it " +
                                                 ((value == null) ?
                                                  "is a null value." :
                                                  "has class " +
                                                  value.getClass().getName()) + "." );
      }
  
      private static String formatByte(byte b) {
          return String.format("(byte)0x%02x", b);
      }
  
      private static String formatShort(short s) {
          return String.format("(short)%d", s);
      }
  
      private static String formatLong(long lng) {
          return lng + "L";
      }
  
      private static String formatFloat(float f) {
          if (Float.isNaN(f))
              return "0.0f/0.0f";
          else if (Float.isInfinite(f))
              return (f < 0) ? "-1.0f/0.0f" : "1.0f/0.0f";
          else
              return f + "f";
      }
  
      private static String formatDouble(double d) {
          if (Double.isNaN(d))
              return "0.0/0.0";
          else if (Double.isInfinite(d))
              return (d < 0) ? "-1.0/0.0" : "1.0/0.0";
          else
              return d + "";
      }
  
      private static String formatChar(char c) {
          return '\'' + Convert.quote(c) + '\'';
      }
  
      private static String formatString(String s) {
          return '"' + Convert.quote(s) + '"';
      }
  }
  