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+/*
+ * Copyright (C) 2012 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.
+ */
+
+#ifndef LATINIME_TERMINAL_ATTRIBUTES_H
+#define LATINIME_TERMINAL_ATTRIBUTES_H
+
+#include "unigram_dictionary.h"
+
+namespace latinime {
+
+/**
+ * This class encapsulates information about a terminal that allows to
+ * retrieve local node attributes like the list of shortcuts without
+ * exposing the format structure to the client.
+ */
+class TerminalAttributes {
+ public:
+ class ShortcutIterator {
+ const uint8_t* const mDict;
+ bool mHasNextShortcutTarget;
+ int mPos;
+
+ public:
+ ShortcutIterator(const uint8_t* dict, const int pos, const uint8_t flags) : mDict(dict),
+ mPos(pos) {
+ mHasNextShortcutTarget = (0 != (flags & UnigramDictionary::FLAG_HAS_SHORTCUT_TARGETS));
+ }
+
+ inline bool hasNextShortcutTarget() const {
+ return mHasNextShortcutTarget;
+ }
+
+ // Gets the shortcut target itself as a uint16_t string. For parameters and return value
+ // see BinaryFormat::getWordAtAddress.
+ // TODO: make the output an uint32_t* to handle the whole unicode range.
+ inline int getNextShortcutTarget(const int maxDepth, uint16_t* outWord) {
+ const int shortcutFlags = BinaryFormat::getFlagsAndForwardPointer(mDict, &mPos);
+ mHasNextShortcutTarget =
+ 0 != (shortcutFlags & UnigramDictionary::FLAG_ATTRIBUTE_HAS_NEXT);
+ unsigned int i;
+ for (i = 0; i < MAX_WORD_LENGTH_INTERNAL; ++i) {
+ const int charCode = BinaryFormat::getCharCodeAndForwardPointer(mDict, &mPos);
+ if (NOT_A_CHARACTER == charCode) break;
+ outWord[i] = (uint16_t)charCode;
+ }
+ mPos += BinaryFormat::CHARACTER_ARRAY_TERMINATOR_SIZE;
+ return i;
+ }
+ };
+
+ private:
+ DISALLOW_IMPLICIT_CONSTRUCTORS(TerminalAttributes);
+ const uint8_t* const mDict;
+ const uint8_t mFlags;
+ const int mStartPos;
+
+ public:
+ TerminalAttributes(const uint8_t* const dict, const uint8_t flags, const int pos) :
+ mDict(dict), mFlags(flags), mStartPos(pos) {
+ }
+
+ inline ShortcutIterator getShortcutIterator() const {
+ // The size of the shortcuts is stored here so that the whole shortcut chunk can be
+ // skipped quickly, so we ignore it.
+ return ShortcutIterator(mDict, mStartPos + BinaryFormat::SHORTCUT_LIST_SIZE_SIZE, mFlags);
+ }
+};
+} // namespace latinime
+
+#endif // LATINIME_TERMINAL_ATTRIBUTES_H