langtools/src/share/classes/com/sun/tools/javac/code/TypeTags.java

/*
 * Copyright (c) 1999, 2012, 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
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package com.sun.tools.javac.code;


/** An interface for type tag values, which distinguish between different
 *  sorts of types.
 *
 *  <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 TypeTags {

    private TypeTags() {} // uninstantiable

    /** The tag of the basic type `byte'.
     */
    public static final int BYTE = 1;

    /** The tag of the basic type `char'.
     */
    public static final int CHAR = BYTE+1;

    /** The tag of the basic type `short'.
     */
    public static final int SHORT = CHAR+1;

    /** The tag of the basic type `int'.
     */
    public static final int INT = SHORT+1;

    /** The tag of the basic type `long'.
     */
    public static final int LONG = INT+1;

    /** The tag of the basic type `float'.
     */
    public static final int FLOAT = LONG+1;

    /** The tag of the basic type `double'.
     */
    public static final int DOUBLE = FLOAT+1;

    /** The tag of the basic type `boolean'.
     */
    public static final int BOOLEAN = DOUBLE+1;

    /** The tag of the type `void'.
     */
    public static final int VOID = BOOLEAN+1;

    /** The tag of all class and interface types.
     */
    public static final int CLASS = VOID+1;

    /** The tag of all array types.
     */
    public static final int ARRAY = CLASS+1;

    /** The tag of all (monomorphic) method types.
     */
    public static final int METHOD = ARRAY+1;

    /** The tag of all package "types".
     */
    public static final int PACKAGE = METHOD+1;

    /** The tag of all (source-level) type variables.
     */
    public static final int TYPEVAR = PACKAGE+1;

    /** The tag of all type arguments.
     */
    public static final int WILDCARD = TYPEVAR+1;

    /** The tag of all polymorphic (method-) types.
     */
    public static final int FORALL = WILDCARD+1;

    /** The tag of deferred expression types in method context
     */
    public static final int DEFERRED = FORALL+1;

    /** The tag of the bottom type {@code <null>}.
     */
    public static final int BOT = DEFERRED+1;

    /** The tag of a missing type.
     */
    public static final int NONE = BOT+1;

    /** The tag of the error type.
     */
    public static final int ERROR = NONE+1;

    /** The tag of an unknown type
     */
    public static final int UNKNOWN = ERROR+1;

    /** The tag of all instantiatable type variables.
     */
    public static final int UNDETVAR = UNKNOWN+1;

    /** The number of type tags.
     */
    public static final int TypeTagCount = UNDETVAR+1;

    /** The maximum tag of a basic type.
     */
    public static final int lastBaseTag = BOOLEAN;

    /** The minimum tag of a partial type
     */
    public static final int firstPartialTag = ERROR;
}