2 * Copyright 2007 ZXing authors
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package com.google.zxing;
19 import java.util.List;
22 * Encapsulates a type of hint that a caller may pass to a barcode reader to help it
23 * more quickly or accurately decode it. It is up to implementations to decide what,
24 * if anything, to do with the information that is supplied.
27 * @author dswitkin@google.com (Daniel Switkin)
28 * @see Reader#decode(BinaryBitmap,java.util.Map)
30 public enum DecodeHintType {
33 * Unspecified, application-specific hint. Maps to an unspecified {@link Object}.
38 * Image is a pure monochrome image of a barcode. Doesn't matter what it maps to;
39 * use {@link Boolean#TRUE}.
41 PURE_BARCODE(Void.class),
44 * Image is known to be of one of a few possible formats.
45 * Maps to a {@link List} of {@link BarcodeFormat}s.
47 POSSIBLE_FORMATS(List.class),
50 * Spend more time to try to find a barcode; optimize for accuracy, not speed.
51 * Doesn't matter what it maps to; use {@link Boolean#TRUE}.
53 TRY_HARDER(Void.class),
56 * Specifies what character encoding to use when decoding, where applicable (type String)
58 CHARACTER_SET(String.class),
61 * Allowed lengths of encoded data -- reject anything else. Maps to an {@code int[]}.
63 ALLOWED_LENGTHS(int[].class),
66 * Assume Code 39 codes employ a check digit. Doesn't matter what it maps to;
67 * use {@link Boolean#TRUE}.
69 ASSUME_CODE_39_CHECK_DIGIT(Void.class),
72 * Assume the barcode is being processed as a GS1 barcode, and modify behavior as needed.
73 * For example this affects FNC1 handling for Code 128 (aka GS1-128). Doesn't matter what it maps to;
74 * use {@link Boolean#TRUE}.
76 ASSUME_GS1(Void.class),
79 * If true, return the start and end digits in a Codabar barcode instead of stripping them. They
80 * are alpha, whereas the rest are numeric. By default, they are stripped, but this causes them
81 * to not be. Doesn't matter what it maps to; use {@link Boolean#TRUE}.
83 RETURN_CODABAR_START_END(Void.class),
86 * The caller needs to be notified via callback when a possible {@link ResultPoint}
87 * is found. Maps to a {@link ResultPointCallback}.
89 NEED_RESULT_POINT_CALLBACK(ResultPointCallback.class),
91 // End of enumeration values.
95 * Data type the hint is expecting.
96 * Among the possible values the {@link Void} stands out as being used for
97 * hints that do not expect a value to be supplied (flag hints). Such hints
98 * will possibly have their value ignored, or replaced by a
99 * {@link Boolean#TRUE}. Hint suppliers should probably use
100 * {@link Boolean#TRUE} as directed by the actual hint documentation.
102 private final Class<?> valueType;
104 DecodeHintType(Class<?> valueType) {
105 this.valueType = valueType;
108 public Class<?> getValueType() {