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Sms7BitEncodingTranslator.javaAPI DocAndroid 5.1 API9358Thu Mar 12 22:22:54 GMT 2015com.android.internal.telephony

Sms7BitEncodingTranslator

public class Sms7BitEncodingTranslator extends Object

Fields Summary
private static final String
TAG
private static final boolean
DBG
private static boolean
mIs7BitTranslationTableLoaded
private static android.util.SparseIntArray
mTranslationTable
private static android.util.SparseIntArray
mTranslationTableCommon
private static android.util.SparseIntArray
mTranslationTableGSM
private static android.util.SparseIntArray
mTranslationTableCDMA
private static final String
XML_START_TAG
private static final String
XML_TRANSLATION_TYPE_TAG
private static final String
XML_CHARACTOR_TAG
private static final String
XML_FROM_TAG
private static final String
XML_TO_TAG
Constructors Summary
Methods Summary
private static voidload7BitTranslationTableFromXml()
Load the whole translation table file from the framework resource encoded in XML.

        XmlResourceParser parser = null;
        Resources r = Resources.getSystem();

        if (parser == null) {
            if (DBG) Rlog.d(TAG, "load7BitTranslationTableFromXml: open normal file");
            parser = r.getXml(com.android.internal.R.xml.sms_7bit_translation_table);
        }

        try {
            XmlUtils.beginDocument(parser, XML_START_TAG);
            while (true)  {
                XmlUtils.nextElement(parser);
                String tag = parser.getName();
                if (DBG) {
                    Rlog.d(TAG, "tag: " + tag);
                }
                if (XML_TRANSLATION_TYPE_TAG.equals(tag)) {
                    String type = parser.getAttributeValue(null, "Type");
                    if (DBG) {
                        Rlog.d(TAG, "type: " + type);
                    }
                    if (type.equals("common")) {
                        mTranslationTable = mTranslationTableCommon;
                    } else if (type.equals("gsm")) {
                        mTranslationTable = mTranslationTableGSM;
                    } else if (type.equals("cdma")) {
                        mTranslationTable = mTranslationTableCDMA;
                    } else {
                        Rlog.e(TAG, "Error Parsing 7BitTranslationTable: found incorrect type" + type);
                    }
                } else if (XML_CHARACTOR_TAG.equals(tag) && mTranslationTable != null) {
                    int from = parser.getAttributeUnsignedIntValue(null,
                            XML_FROM_TAG, -1);
                    int to = parser.getAttributeUnsignedIntValue(null,
                            XML_TO_TAG, -1);
                    if ((from != -1) && (to != -1)) {
                        if (DBG) {
                            Rlog.d(TAG, "Loading mapping " + Integer.toHexString(from)
                                    .toUpperCase() + " -> " + Integer.toHexString(to)
                                    .toUpperCase());
                        }
                        mTranslationTable.put (from, to);
                    } else {
                        Rlog.d(TAG, "Invalid translation table file format");
                    }
                } else {
                    break;
                }
            }
            if (DBG) Rlog.d(TAG, "load7BitTranslationTableFromXml: parsing successful, file loaded");
        } catch (Exception e) {
            Rlog.e(TAG, "Got exception while loading 7BitTranslationTable file.", e);
        } finally {
            if (parser instanceof XmlResourceParser) {
                ((XmlResourceParser)parser).close();
            }
        }
private static booleannoTranslationNeeded(char c, boolean isCdmaFormat)

        if (isCdmaFormat) {
            return GsmAlphabet.isGsmSeptets(c) && UserData.charToAscii.get(c, -1) != -1;
        }
        else {
            return GsmAlphabet.isGsmSeptets(c);
        }
public static java.lang.Stringtranslate(java.lang.CharSequence message)
Translates each message character that is not supported by GSM 7bit alphabet into a supported one

param
message message to be translated
param
throwsException if true and some error occurs during translation, an exception is thrown; otherwise a null String is returned
return
translated message or null if some error occur


                                                                                             
         
        if (message == null) {
            Rlog.w(TAG, "Null message can not be translated");
            return null;
        }

        int size = message.length();
        if (size <= 0) {
            return "";
        }

        if (!mIs7BitTranslationTableLoaded) {
            mTranslationTableCommon = new SparseIntArray();
            mTranslationTableGSM = new SparseIntArray();
            mTranslationTableCDMA = new SparseIntArray();
            load7BitTranslationTableFromXml();
            mIs7BitTranslationTableLoaded = true;
        }

        if ((mTranslationTableCommon != null && mTranslationTableCommon.size() > 0) ||
                (mTranslationTableGSM != null && mTranslationTableGSM.size() > 0) ||
                (mTranslationTableCDMA != null && mTranslationTableCDMA.size() > 0)) {
            char[] output = new char[size];
            boolean isCdmaFormat = useCdmaFormatForMoSms();
            for (int i = 0; i < size; i++) {
                output[i] = translateIfNeeded(message.charAt(i), isCdmaFormat);
            }

            return String.valueOf(output);
        }

        return null;
private static chartranslateIfNeeded(char c, boolean isCdmaFormat)
Translates a single character into its corresponding acceptable one, if needed, based on GSM 7-bit alphabet

param
c character to be translated
return
original character, if it's present on GSM 7-bit alphabet; a corresponding character, based on the translation table or white space, if no mapping is found in the translation table for such character

        if (noTranslationNeeded(c, isCdmaFormat)) {
            if (DBG) {
                Rlog.v(TAG, "No translation needed for " + Integer.toHexString(c));
            }
            return c;
        }

        /*
         * Trying to translate unicode to Gsm 7-bit alphabet; If c is not
         * present on translation table, c does not belong to Unicode Latin-1
         * (Basic + Supplement), so we don't know how to translate it to a Gsm
         * 7-bit character! We replace c for an empty space and advises the user
         * about it.
         */
        int translation = -1;

        if (mTranslationTableCommon != null) {
            translation = mTranslationTableCommon.get(c, -1);
        }

        if (translation == -1) {
            if (isCdmaFormat) {
                if (mTranslationTableCDMA != null) {
                    translation = mTranslationTableCDMA.get(c, -1);
                }
            } else {
                if (mTranslationTableGSM != null) {
                    translation = mTranslationTableGSM.get(c, -1);
                }
            }
        }

        if (translation != -1) {
            if (DBG) {
                Rlog.v(TAG, Integer.toHexString(c) + " (" + c + ")" + " translated to "
                        + Integer.toHexString(translation) + " (" + (char) translation + ")");
            }
            return (char) translation;
        } else {
            if (DBG) {
                Rlog.w(TAG, "No translation found for " + Integer.toHexString(c)
                        + "! Replacing for empty space");
            }
            return ' ";
        }
private static booleanuseCdmaFormatForMoSms()

        if (!SmsManager.getDefault().isImsSmsSupported()) {
            // use Voice technology to determine SMS format.
            return TelephonyManager.getDefault().getCurrentPhoneType()
                    == PhoneConstants.PHONE_TYPE_CDMA;
        }
        // IMS is registered with SMS support, check the SMS format supported
        return (SmsConstants.FORMAT_3GPP2.equals(SmsManager.getDefault().getImsSmsFormat()));