package Dell55aa;
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public class Dell55AA12HighPerf { // ¸ßÐÔÄܽâÎöÀà
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// ³£Á¿¶¨Ò壨±ÜÃâÖظ´´´½¨£©
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private static final String HEADER = "55AA12"; // °üÍ·³£Á¿
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private static final int MIN_LENGTH = 34; // ×îСÓÐЧ³¤¶È
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private static final ThreadLocal<ParseResult> RESULT_CACHE = // Ï̱߳¾µØ½á¹û»º´æ
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ThreadLocal.withInitial(ParseResult::new);
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private static final ThreadLocal<char[]> CHAR_BUF_CACHE = // ×Ö·û»º³åÇø»º´æ
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ThreadLocal.withInitial(() -> new char[256]);
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// Ê®Áù½øÖÆ×Ö·ûת»»±í£¨±ÜÃâÖظ´¼ÆË㣩
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private static final int[] HEX_VALUES = new int[128];
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static {
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for (int i = 0; i < HEX_VALUES.length; i++) {
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char c = (char) i;
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if (c >= '0' && c <= '9') HEX_VALUES[i] = c - '0';
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else if (c >= 'A' && c <= 'F') HEX_VALUES[i] = 10 + (c - 'A');
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else if (c >= 'a' && c <= 'f') HEX_VALUES[i] = 10 + (c - 'a');
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else HEX_VALUES[i] = -1; // ·Ç·¨×Ö·û±ê¼Ç
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}
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}
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// ½âÎö½á¹û¸´ÓÃÀࣨ¶ÔÏó³Øģʽ£©
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public static class ParseResult {
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public int tagId;
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public int sequenceNum;
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public int power;
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public int vibrationState;
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public boolean tagRemoved;
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public boolean isSleeping;
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public boolean isStatic;
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public boolean sosButtonPressed;
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public int tagHeight;
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public int anchorCount;
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public int[] anchorIds = new int[0];
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public int[] distances = new int[0];
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public int[] anchorPowers = new int[0];
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public int[] signalStrengths1 = new int[0];
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public int[] signalStrengths2 = new int[0];
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// ÖØÖ÷½·¨£¨±ÜÃâÖØд´½¨Êý×飩
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public void reset() {
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tagId = 0;
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sequenceNum = 0;
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power = 0;
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vibrationState = 0;
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tagRemoved = false;
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isSleeping = false;
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isStatic = false;
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sosButtonPressed = false;
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tagHeight = 0;
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anchorCount = 0;
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// ±£ÁôÊý×飬½öÖØÖó¤¶È
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}
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}
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/**
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* ¸ßÐÔÄܽâÎö·½·¨
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* @param message Ôʼ16½øÖÆÏûÏ¢
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* @return ½âÎö½á¹û¶ÔÏó£¨Ïß³ÌÄÚ¸´Óã©
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*/
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public static ParseResult parse(String message) {
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// ¿ìËÙ³¤¶ÈУÑé
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if (message == null || message.length() < MIN_LENGTH) {
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return null; // ¿ìËÙʧ°Ü
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}
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// °üÍ·¼ì²é£¨±ÜÃâ´´½¨×Ó×Ö·û´®£©
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if (!(message.charAt(0) == '5' &&
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message.charAt(1) == '5' &&
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message.charAt(2) == 'A' &&
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message.charAt(3) == 'A' &&
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message.charAt(4) == '1' &&
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message.charAt(5) == '2')) {
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return null; // °üÍ·ÎÞЧ
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}
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// ´ÓÏ̻߳º´æ»ñÈ¡½á¹û¶ÔÏó
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ParseResult result = RESULT_CACHE.get();
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result.reset(); // ÖØÖöÔÏó״̬
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// Ö±½Ó²Ù×÷×Ö·ûÊý×飨±ÜÃâ×Ö·û´®²Ù×÷£©
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char[] chars = CHAR_BUF_CACHE.get();
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message.getChars(0, Math.min(message.length(), chars.length), chars, 0);
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// ½âÎöÊý¾Ý³¤¶È£¨Ö±½Ó¼ÆË㣩
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int dataLength = (fastHexToByte(chars[6], chars[7]) * 2) + 8;
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if (message.length() != dataLength) {
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return null; // ³¤¶È²»Æ¥Åä
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}
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// ½âÎö±êÇ©ÐÅÏ¢£¨ÎÞÁÙʱ¶ÔÏó´´½¨£©
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parseTagInfo(chars, result);
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// ½âÎö»ùÕ¾ÐÅÏ¢£¨Êý×鸴Óã©
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parseAnchorInfo(chars, result);
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return result;
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}
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/**
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* ±êÇ©ÐÅÏ¢½âÎö£¨ÎÞ¶ÔÏó´´½¨£©
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*/
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private static void parseTagInfo(char[] chars, ParseResult result) {
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// ±êÇ©ID£¨Ö±½Ó¼ÆË㣩
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result.tagId = (fastHexToByte(chars[10], chars[11]) << 8) |
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fastHexToByte(chars[8], chars[9]);
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// °üÐòÁкţ¨Ö±½Ó¼ÆË㣩
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result.sequenceNum = (fastHexToByte(chars[14], chars[15]) << 8) |
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fastHexToByte(chars[12], chars[13]);
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// µçÁ¿£¨µ¥×Ö½Úת»»£©
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result.power = fastHexToByte(chars[16], chars[17]);
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// °´¼ü״̬£¨Î»ÔËËã´úÌæ×Ö·û´®²Ù×÷£©
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int buttonState = fastHexToByte(chars[18], chars[19]);
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result.vibrationState = (buttonState >> 5) & 1; // µÚ2λ
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result.tagRemoved = ((buttonState >> 3) & 1) == 1; // µÚ4λ
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result.isSleeping = ((buttonState >> 2) & 1) == 1; // µÚ5λ
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result.isStatic = ((buttonState >> 1) & 1) == 1; // µÚ6λ
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result.sosButtonPressed = (buttonState & 1) == 1; // µÚ7λ
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// ±êÇ©¸ß¶È£¨Ö±½Ó¼ÆË㣩
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result.tagHeight = (fastHexToByte(chars[22], chars[23]) << 8) |
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fastHexToByte(chars[20], chars[21]);
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}
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/**
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* »ùÕ¾ÐÅÏ¢½âÎö£¨Êý×鸴Óã©
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*/
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private static void parseAnchorInfo(char[] chars, ParseResult result) {
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// »ùÕ¾ÊýÁ¿
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result.anchorCount = fastHexToByte(chars[32], chars[33]);
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if (result.anchorCount == 0) return;
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// Êý×鸴Óüì²é£¨±ÜÃâÖظ´´´½¨£©
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if (result.anchorIds.length < result.anchorCount) {
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result.anchorIds = new int[result.anchorCount];
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result.distances = new int[result.anchorCount];
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result.anchorPowers = new int[result.anchorCount];
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result.signalStrengths1 = new int[result.anchorCount];
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result.signalStrengths2 = new int[result.anchorCount];
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}
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// »ùÕ¾ÐÅÏ¢½âÎö£¨Ö±½ÓË÷Òý¼ÆË㣩
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int baseIndex = 34;
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int powerIndex = 34 + result.anchorCount * 4;
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for (int i = 0; i < result.anchorCount; i++) {
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// »ùÕ¾ID£¨Ð¡¶ËÐò£©
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int idLow = fastHexToByte(chars[baseIndex], chars[baseIndex+1]);
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int idHigh = fastHexToByte(chars[baseIndex+2], chars[baseIndex+3]);
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result.anchorIds[i] = (idHigh << 8) | idLow;
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// »ùÕ¾¾àÀë
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int distLow = fastHexToByte(chars[baseIndex+4], chars[baseIndex+5]);
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int distHigh = fastHexToByte(chars[baseIndex+6], chars[baseIndex+7]);
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result.distances[i] = (distHigh << 8) | distLow;
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// »ùÕ¾µçÁ¿
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result.anchorPowers[i] = fastHexToByte(chars[powerIndex], chars[powerIndex+1]);
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baseIndex += 8; // ÿ¸ö»ùÕ¾Õ¼ÓÃ8×Ö·û
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powerIndex += 2; // ÿ¸öµçÁ¿Õ¼ÓÃ2×Ö·û
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}
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}
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/**
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* ¿ìËÙÊ®Áù½øÖÆת×Ö½Ú£¨²é±í·¨£©
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*/
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private static int fastHexToByte(char c1, char c2) {
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int high = (c1 < 128) ? HEX_VALUES[c1] : -1;
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int low = (c2 < 128) ? HEX_VALUES[c2] : -1;
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if (high < 0 || low < 0) return 0; // ÎÞЧ×Ö·û´¦Àí
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return (high << 4) | low;
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}
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}
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