/*

 * Copyright 2001-2005 Sun Microsystems, Inc.  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.

 *

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

package sun.jvm.hotspot.utilities;

public class ConstantTag {

  // These replicated from the VM to save space

  private static int JVM_CONSTANT_Utf8                    = 1;

  private static int JVM_CONSTANT_Unicode                 = 2; // unused

  private static int JVM_CONSTANT_Integer                 = 3;

  private static int JVM_CONSTANT_Float                   = 4;

  private static int JVM_CONSTANT_Long                    = 5;

  private static int JVM_CONSTANT_Double                  = 6;

  private static int JVM_CONSTANT_Class                   = 7;

  private static int JVM_CONSTANT_String                  = 8;

  private static int JVM_CONSTANT_Fieldref                = 9;

  private static int JVM_CONSTANT_Methodref               = 10;

  private static int JVM_CONSTANT_InterfaceMethodref      = 11;

  private static int JVM_CONSTANT_NameAndType             = 12;

  private static int JVM_CONSTANT_Invalid                 = 0;   // For bad value initialization

  private static int JVM_CONSTANT_UnresolvedClass         = 100; // Temporary tag until actual use

  private static int JVM_CONSTANT_ClassIndex              = 101; // Temporary tag while constructing constant pool

  private static int JVM_CONSTANT_UnresolvedString        = 102; // Temporary tag until actual use

  private static int JVM_CONSTANT_StringIndex             = 103; // Temporary tag while constructing constant pool

  private static int JVM_CONSTANT_UnresolvedClassInError  = 104; // Resolution failed

  private byte tag;

  public ConstantTag(byte tag) {

    this.tag = tag;

  }

  public boolean isKlass()            { return tag == JVM_CONSTANT_Class; }

  public boolean isField ()           { return tag == JVM_CONSTANT_Fieldref; }

  public boolean isMethod()           { return tag == JVM_CONSTANT_Methodref; }

  public boolean isInterfaceMethod()  { return tag == JVM_CONSTANT_InterfaceMethodref; }

  public boolean isString()           { return tag == JVM_CONSTANT_String; }

  public boolean isInt()              { return tag == JVM_CONSTANT_Integer; }

  public boolean isFloat()            { return tag == JVM_CONSTANT_Float; }

  public boolean isLong()             { return tag == JVM_CONSTANT_Long; }

  public boolean isDouble()           { return tag == JVM_CONSTANT_Double; }

  public boolean isNameAndType()      { return tag == JVM_CONSTANT_NameAndType; }

  public boolean isUtf8()             { return tag == JVM_CONSTANT_Utf8; }

  public boolean isInvalid()          { return tag == JVM_CONSTANT_Invalid; }

  public boolean isUnresolvedKlass()  {

    return tag == JVM_CONSTANT_UnresolvedClass || tag == JVM_CONSTANT_UnresolvedClassInError;

  }

  public boolean isUnresolveKlassInError()  { return tag == JVM_CONSTANT_UnresolvedClassInError; }

  public boolean isKlassIndex()             { return tag == JVM_CONSTANT_ClassIndex; }

  public boolean isUnresolvedString()       { return tag == JVM_CONSTANT_UnresolvedString; }

  public boolean isStringIndex()            { return tag == JVM_CONSTANT_StringIndex; }

  public boolean isKlassReference()   { return isKlassIndex() || isUnresolvedKlass(); }

  public boolean isFieldOrMethod()    { return isField() || isMethod() || isInterfaceMethod(); }

  public boolean isSymbol()           { return isUtf8(); }

}