--- /dev/null
+/*
+ * Copyright 2007 ZXing authors
+ *
+ * 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.google.zxing;
+
+import java.util.List;
+
+/**
+ * Encapsulates a type of hint that a caller may pass to a barcode reader to help it
+ * more quickly or accurately decode it. It is up to implementations to decide what,
+ * if anything, to do with the information that is supplied.
+ *
+ * @author Sean Owen
+ * @author dswitkin@google.com (Daniel Switkin)
+ * @see Reader#decode(BinaryBitmap,java.util.Map)
+ */
+public enum DecodeHintType {
+
+ /**
+ * Unspecified, application-specific hint. Maps to an unspecified {@link Object}.
+ */
+ OTHER(Object.class),
+
+ /**
+ * Image is a pure monochrome image of a barcode. Doesn't matter what it maps to;
+ * use {@link Boolean#TRUE}.
+ */
+ PURE_BARCODE(Void.class),
+
+ /**
+ * Image is known to be of one of a few possible formats.
+ * Maps to a {@link List} of {@link BarcodeFormat}s.
+ */
+ POSSIBLE_FORMATS(List.class),
+
+ /**
+ * Spend more time to try to find a barcode; optimize for accuracy, not speed.
+ * Doesn't matter what it maps to; use {@link Boolean#TRUE}.
+ */
+ TRY_HARDER(Void.class),
+
+ /**
+ * Specifies what character encoding to use when decoding, where applicable (type String)
+ */
+ CHARACTER_SET(String.class),
+
+ /**
+ * Allowed lengths of encoded data -- reject anything else. Maps to an {@code int[]}.
+ */
+ ALLOWED_LENGTHS(int[].class),
+
+ /**
+ * Assume Code 39 codes employ a check digit. Doesn't matter what it maps to;
+ * use {@link Boolean#TRUE}.
+ */
+ ASSUME_CODE_39_CHECK_DIGIT(Void.class),
+
+ /**
+ * Assume the barcode is being processed as a GS1 barcode, and modify behavior as needed.
+ * For example this affects FNC1 handling for Code 128 (aka GS1-128). Doesn't matter what it maps to;
+ * use {@link Boolean#TRUE}.
+ */
+ ASSUME_GS1(Void.class),
+
+ /**
+ * If true, return the start and end digits in a Codabar barcode instead of stripping them. They
+ * are alpha, whereas the rest are numeric. By default, they are stripped, but this causes them
+ * to not be. Doesn't matter what it maps to; use {@link Boolean#TRUE}.
+ */
+ RETURN_CODABAR_START_END(Void.class),
+
+ /**
+ * The caller needs to be notified via callback when a possible {@link ResultPoint}
+ * is found. Maps to a {@link ResultPointCallback}.
+ */
+ NEED_RESULT_POINT_CALLBACK(ResultPointCallback.class),
+
+ // End of enumeration values.
+ ;
+
+ /**
+ * Data type the hint is expecting.
+ * Among the possible values the {@link Void} stands out as being used for
+ * hints that do not expect a value to be supplied (flag hints). Such hints
+ * will possibly have their value ignored, or replaced by a
+ * {@link Boolean#TRUE}. Hint suppliers should probably use
+ * {@link Boolean#TRUE} as directed by the actual hint documentation.
+ */
+ private final Class<?> valueType;
+
+ DecodeHintType(Class<?> valueType) {
+ this.valueType = valueType;
+ }
+
+ public Class<?> getValueType() {
+ return valueType;
+ }
+
+}