| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.dx.rop.cst; |
| |
| import com.android.dx.rop.type.Type; |
| |
| /** |
| * Constant type to represent a known-{@code null} value. |
| */ |
| public final class CstKnownNull extends CstLiteralBits { |
| /** {@code non-null;} unique instance of this class */ |
| public static final CstKnownNull THE_ONE = new CstKnownNull(); |
| |
| /** |
| * Constructs an instance. This class is not publicly instantiable. Use |
| * {@link #THE_ONE}. |
| */ |
| private CstKnownNull() { |
| // This space intentionally left blank. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean equals(Object other) { |
| return (other instanceof CstKnownNull); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int hashCode() { |
| return 0x4466757a; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| protected int compareTo0(Constant other) { |
| return 0; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String toString() { |
| return "known-null"; |
| } |
| |
| /** {@inheritDoc} */ |
| public Type getType() { |
| return Type.KNOWN_NULL; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public String typeName() { |
| return "known-null"; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean isCategory2() { |
| return false; |
| } |
| |
| /** {@inheritDoc} */ |
| public String toHuman() { |
| return "null"; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean fitsInInt() { |
| // See comment in getIntBits(). |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * As "literal bits," a known-null is always represented as the |
| * number zero. |
| */ |
| @Override |
| public int getIntBits() { |
| return 0; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * As "literal bits," a known-null is always represented as the |
| * number zero. |
| */ |
| @Override |
| public long getLongBits() { |
| return 0; |
| } |
| } |