Zeroes.java revision 579d7739c53a2707ad711a2d2cae46d7d782f061 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.dx.rop.cst;
18
19import com.android.dx.rop.type.Type;
20
21/**
22 * Utility for turning types into zeroes.
23 */
24public final class Zeroes {
25    /**
26     * This class is uninstantiable.
27     */
28    private Zeroes() {
29        // This space intentionally left blank.
30    }
31
32    /**
33     * Gets the "zero" (or {@code null}) value for the given type.
34     *
35     * @param type {@code non-null;} the type in question
36     * @return {@code non-null;} its "zero" value
37     */
38    public static Constant zeroFor(Type type) {
39        switch (type.getBasicType()) {
40            case Type.BT_BOOLEAN: return CstBoolean.VALUE_FALSE;
41            case Type.BT_BYTE:    return CstByte.VALUE_0;
42            case Type.BT_CHAR:    return CstChar.VALUE_0;
43            case Type.BT_DOUBLE:  return CstDouble.VALUE_0;
44            case Type.BT_FLOAT:   return CstFloat.VALUE_0;
45            case Type.BT_INT:     return CstInteger.VALUE_0;
46            case Type.BT_LONG:    return CstLong.VALUE_0;
47            case Type.BT_SHORT:   return CstShort.VALUE_0;
48            case Type.BT_OBJECT:  return CstKnownNull.THE_ONE;
49            default: {
50                throw new UnsupportedOperationException("no zero for type: " +
51                        type.toHuman());
52            }
53        }
54    }
55}
56