sun.text.normalizer.NormalizerBase Java Examples

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

public static NormalizerBase.Mode toNormalizerMode(int mode) {
    NormalizerBase.Mode normalizerMode;

    try {
        normalizerMode = legacyModeMap[mode];
    }
    catch(ArrayIndexOutOfBoundsException e) {
        normalizerMode = NormalizerBase.NONE;
    }
    return normalizerMode;

}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

public static int toLegacyMode(NormalizerBase.Mode mode) {
    // find the index of the legacy mode in the table;
    // if it's not there, default to Collator.NO_DECOMPOSITION (0)
    int legacyMode = legacyModeMap.length;
    while (legacyMode > 0) {
        --legacyMode;
        if (legacyModeMap[legacyMode] == mode) {
            break;
        }
    }
    return legacyMode;
}
 

public static NormalizerBase.Mode toNormalizerMode(int mode) {
    NormalizerBase.Mode normalizerMode;

    try {
        normalizerMode = legacyModeMap[mode];
    }
    catch(ArrayIndexOutOfBoundsException e) {
        normalizerMode = NormalizerBase.NONE;
    }
    return normalizerMode;

}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

public static int toLegacyMode(NormalizerBase.Mode mode) {
    // find the index of the legacy mode in the table;
    // if it's not there, default to Collator.NO_DECOMPOSITION (0)
    int legacyMode = legacyModeMap.length;
    while (legacyMode > 0) {
        --legacyMode;
        if (legacyModeMap[legacyMode] == mode) {
            break;
        }
    }
    return legacyMode;
}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

public static int toLegacyMode(NormalizerBase.Mode mode) {
    // find the index of the legacy mode in the table;
    // if it's not there, default to Collator.NO_DECOMPOSITION (0)
    int legacyMode = legacyModeMap.length;
    while (legacyMode > 0) {
        --legacyMode;
        if (legacyModeMap[legacyMode] == mode) {
            break;
        }
    }
    return legacyMode;
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

public static int toLegacyMode(NormalizerBase.Mode mode) {
    // find the index of the legacy mode in the table;
    // if it's not there, default to Collator.NO_DECOMPOSITION (0)
    int legacyMode = legacyModeMap.length;
    while (legacyMode > 0) {
        --legacyMode;
        if (legacyModeMap[legacyMode] == mode) {
            break;
        }
    }
    return legacyMode;
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

/**
 * Resets the cursor to the beginning of the string.  The next call
 * to next() will return the first collation element in the string.
 */
public void reset()
{
    if (text != null) {
        text.reset();
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text.setMode(mode);
    }
    buffer = null;
    expIndex = 0;
    swapOrder = 0;
}
 

/**
 * CollationElementIterator constructor.  This takes the source string and
 * the collation object.  The cursor will walk thru the source string based
 * on the predefined collation rules.  If the source string is empty,
 * NULLORDER will be returned on the calls to next().
 * @param sourceText the source string.
 * @param owner the collation object.
 */
CollationElementIterator(String sourceText, RuleBasedCollator owner) {
    this.owner = owner;
    ordering = owner.getTables();
    if ( sourceText.length() != 0 ) {
        NormalizerBase.Mode mode =
            CollatorUtilities.toNormalizerMode(owner.getDecomposition());
        text = new NormalizerBase(sourceText, mode);
    }
}
 

public static int toLegacyMode(NormalizerBase.Mode mode) {
    // find the index of the legacy mode in the table;
    // if it's not there, default to Collator.NO_DECOMPOSITION (0)
    int legacyMode = legacyModeMap.length;
    while (legacyMode > 0) {
        --legacyMode;
        if (legacyModeMap[legacyMode] == mode) {
            break;
        }
    }
    return legacyMode;
}
 

/**
 * Get the next collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the next character in the
 * string".</p>
 * <p>This function returns the collation element that the iterator is currently
 * pointing to and then updates the internal pointer to point to the next element.
 * previous() updates the pointer first and then returns the element.  This
 * means that when you change direction while iterating (i.e., call next() and
 * then call previous(), or call previous() and then call next()), you'll get
 * back the same element twice.</p>
 *
 * @return the next collation element
 */
public int next()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }

    // if buffer contains any decomposed char values
    // return their strength orders before continuing in
    // the Normalizer's CharacterIterator.
    if (buffer != null) {
        if (expIndex < buffer.length) {
            return strengthOrder(buffer[expIndex++]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch  = text.next();

    // are we at the end of Normalizer's text?
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);
    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = ch;
        return UNMAPPEDCHARVALUE;
    }
    else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = nextContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = 0;
        value = buffer[expIndex++];
    }

    if (ordering.isSEAsianSwapping()) {
        int consonant;
        if (isThaiPreVowel(ch)) {
            consonant = text.next();
            if (isThaiBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
        if (isLaoPreVowel(ch)) {
            consonant = text.next();
            if (isLaoBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the ordering priority of the next contracting character in the
 * string.
 * @param ch the starting character of a contracting character token
 * @return the next contracting character's ordering.  Returns NULLORDER
 * if the end of string is reached.
 */
private int nextContractChar(int ch)
{
    // First get the ordering of this single character,
    // which is always the first element in the list
    Vector<EntryPair> list = ordering.getContractValues(ch);
    EntryPair pair = list.firstElement();
    int order = pair.value;

    // find out the length of the longest contracting character sequence in the list.
    // There's logic in the builder code to make sure the longest sequence is always
    // the last.
    pair = list.lastElement();
    int maxLength = pair.entryName.length();

    // (the Normalizer is cloned here so that the seeking we do in the next loop
    // won't affect our real position in the text)
    NormalizerBase tempText = (NormalizerBase)text.clone();

    // extract the next maxLength characters in the string (we have to do this using the
    // Normalizer to ensure that our offsets correspond to those the rest of the
    // iterator is using) and store it in "fragment".
    tempText.previous();
    key.setLength(0);
    int c = tempText.next();
    while (maxLength > 0 && c != NormalizerBase.DONE) {
        if (Character.isSupplementaryCodePoint(c)) {
            key.append(Character.toChars(c));
            maxLength -= 2;
        } else {
            key.append((char)c);
            --maxLength;
        }
        c = tempText.next();
    }
    String fragment = key.toString();
    // now that we have that fragment, iterate through this list looking for the
    // longest sequence that matches the characters in the actual text.  (maxLength
    // is used here to keep track of the length of the longest sequence)
    // Upon exit from this loop, maxLength will contain the length of the matching
    // sequence and order will contain the collation-element value corresponding
    // to this sequence
    maxLength = 1;
    for (int i = list.size() - 1; i > 0; i--) {
        pair = list.elementAt(i);
        if (!pair.fwd)
            continue;

        if (fragment.startsWith(pair.entryName) && pair.entryName.length()
                > maxLength) {
            maxLength = pair.entryName.length();
            order = pair.value;
        }
    }

    // seek our current iteration position to the end of the matching sequence
    // and return the appropriate collation-element value (if there was no matching
    // sequence, we're already seeked to the right position and order already contains
    // the correct collation-element value for the single character)
    while (maxLength > 1) {
        c = text.next();
        maxLength -= Character.charCount(c);
    }
    return order;
}
 

/**
 * Get the next collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the next character in the
 * string".</p>
 * <p>This function returns the collation element that the iterator is currently
 * pointing to and then updates the internal pointer to point to the next element.
 * previous() updates the pointer first and then returns the element.  This
 * means that when you change direction while iterating (i.e., call next() and
 * then call previous(), or call previous() and then call next()), you'll get
 * back the same element twice.</p>
 *
 * @return the next collation element
 */
public int next()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }

    // if buffer contains any decomposed char values
    // return their strength orders before continuing in
    // the Normalizer's CharacterIterator.
    if (buffer != null) {
        if (expIndex < buffer.length) {
            return strengthOrder(buffer[expIndex++]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch  = text.next();

    // are we at the end of Normalizer's text?
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);
    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = ch;
        return UNMAPPEDCHARVALUE;
    }
    else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = nextContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = 0;
        value = buffer[expIndex++];
    }

    if (ordering.isSEAsianSwapping()) {
        int consonant;
        if (isThaiPreVowel(ch)) {
            consonant = text.next();
            if (isThaiBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
        if (isLaoPreVowel(ch)) {
            consonant = text.next();
            if (isLaoBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the previous collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the previous character in the
 * string".</p>
 * <p>This function updates the iterator's internal pointer to point to the
 * collation element preceding the one it's currently pointing to and then
 * returns that element, while next() returns the current element and then
 * updates the pointer.  This means that when you change direction while
 * iterating (i.e., call next() and then call previous(), or call previous()
 * and then call next()), you'll get back the same element twice.</p>
 *
 * @return the previous collation element
 * @since 1.2
 */
public int previous()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }
    if (buffer != null) {
        if (expIndex > 0) {
            return strengthOrder(buffer[--expIndex]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch = text.previous();
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);

    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = UNMAPPEDCHARVALUE;
        return ch;
    } else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = prevContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = buffer.length;
        value = buffer[--expIndex];
    }

    if (ordering.isSEAsianSwapping()) {
        int vowel;
        if (isThaiBaseConsonant(ch)) {
            vowel = text.previous();
            if (isThaiPreVowel(vowel)) {
                buffer = makeReorderedBuffer(vowel, value, buffer, false);
                expIndex = buffer.length - 1;
                value = buffer[expIndex];
            } else {
                text.next();
            }
        }
        if (isLaoBaseConsonant(ch)) {
            vowel = text.previous();
            if (isLaoPreVowel(vowel)) {
                buffer = makeReorderedBuffer(vowel, value, buffer, false);
                expIndex = buffer.length - 1;
                value = buffer[expIndex];
            } else {
                text.next();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the ordering priority of the previous contracting character in the
 * string.
 * @param ch the starting character of a contracting character token
 * @return the next contracting character's ordering.  Returns NULLORDER
 * if the end of string is reached.
 */
private int prevContractChar(int ch)
{
    // This function is identical to nextContractChar(), except that we've
    // switched things so that the next() and previous() calls on the Normalizer
    // are switched and so that we skip entry pairs with the fwd flag turned on
    // rather than off.  Notice that we still use append() and startsWith() when
    // working on the fragment.  This is because the entry pairs that are used
    // in reverse iteration have their names reversed already.
    Vector<EntryPair> list = ordering.getContractValues(ch);
    EntryPair pair = list.firstElement();
    int order = pair.value;

    pair = list.lastElement();
    int maxLength = pair.entryName.length();

    NormalizerBase tempText = (NormalizerBase)text.clone();

    tempText.next();
    key.setLength(0);
    int c = tempText.previous();
    while (maxLength > 0 && c != NormalizerBase.DONE) {
        if (Character.isSupplementaryCodePoint(c)) {
            key.append(Character.toChars(c));
            maxLength -= 2;
        } else {
            key.append((char)c);
            --maxLength;
        }
        c = tempText.previous();
    }
    String fragment = key.toString();

    maxLength = 1;
    for (int i = list.size() - 1; i > 0; i--) {
        pair = list.elementAt(i);
        if (pair.fwd)
            continue;

        if (fragment.startsWith(pair.entryName) && pair.entryName.length()
                > maxLength) {
            maxLength = pair.entryName.length();
            order = pair.value;
        }
    }

    while (maxLength > 1) {
        c = text.previous();
        maxLength -= Character.charCount(c);
    }
    return order;
}
 

/**
 * Get the next collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the next character in the
 * string".</p>
 * <p>This function returns the collation element that the iterator is currently
 * pointing to and then updates the internal pointer to point to the next element.
 * previous() updates the pointer first and then returns the element.  This
 * means that when you change direction while iterating (i.e., call next() and
 * then call previous(), or call previous() and then call next()), you'll get
 * back the same element twice.</p>
 *
 * @return the next collation element
 */
public int next()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }

    // if buffer contains any decomposed char values
    // return their strength orders before continuing in
    // the Normalizer's CharacterIterator.
    if (buffer != null) {
        if (expIndex < buffer.length) {
            return strengthOrder(buffer[expIndex++]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch  = text.next();

    // are we at the end of Normalizer's text?
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);
    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = ch;
        return UNMAPPEDCHARVALUE;
    }
    else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = nextContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = 0;
        value = buffer[expIndex++];
    }

    if (ordering.isSEAsianSwapping()) {
        int consonant;
        if (isThaiPreVowel(ch)) {
            consonant = text.next();
            if (isThaiBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
        if (isLaoPreVowel(ch)) {
            consonant = text.next();
            if (isLaoBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the previous collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the previous character in the
 * string".</p>
 * <p>This function updates the iterator's internal pointer to point to the
 * collation element preceding the one it's currently pointing to and then
 * returns that element, while next() returns the current element and then
 * updates the pointer.  This means that when you change direction while
 * iterating (i.e., call next() and then call previous(), or call previous()
 * and then call next()), you'll get back the same element twice.</p>
 *
 * @return the previous collation element
 * @since 1.2
 */
public int previous()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }
    if (buffer != null) {
        if (expIndex > 0) {
            return strengthOrder(buffer[--expIndex]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch = text.previous();
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);

    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = UNMAPPEDCHARVALUE;
        return ch;
    } else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = prevContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = buffer.length;
        value = buffer[--expIndex];
    }

    if (ordering.isSEAsianSwapping()) {
        int vowel;
        if (isThaiBaseConsonant(ch)) {
            vowel = text.previous();
            if (isThaiPreVowel(vowel)) {
                buffer = makeReorderedBuffer(vowel, value, buffer, false);
                expIndex = buffer.length - 1;
                value = buffer[expIndex];
            } else {
                text.next();
            }
        }
        if (isLaoBaseConsonant(ch)) {
            vowel = text.previous();
            if (isLaoPreVowel(vowel)) {
                buffer = makeReorderedBuffer(vowel, value, buffer, false);
                expIndex = buffer.length - 1;
                value = buffer[expIndex];
            } else {
                text.next();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the next collation element in the string.  <p>This iterator iterates
 * over a sequence of collation elements that were built from the string.
 * Because there isn't necessarily a one-to-one mapping from characters to
 * collation elements, this doesn't mean the same thing as "return the
 * collation element [or ordering priority] of the next character in the
 * string".</p>
 * <p>This function returns the collation element that the iterator is currently
 * pointing to and then updates the internal pointer to point to the next element.
 * previous() updates the pointer first and then returns the element.  This
 * means that when you change direction while iterating (i.e., call next() and
 * then call previous(), or call previous() and then call next()), you'll get
 * back the same element twice.</p>
 *
 * @return the next collation element
 */
public int next()
{
    if (text == null) {
        return NULLORDER;
    }
    NormalizerBase.Mode textMode = text.getMode();
    // convert the owner's mode to something the Normalizer understands
    NormalizerBase.Mode ownerMode =
        CollatorUtilities.toNormalizerMode(owner.getDecomposition());
    if (textMode != ownerMode) {
        text.setMode(ownerMode);
    }

    // if buffer contains any decomposed char values
    // return their strength orders before continuing in
    // the Normalizer's CharacterIterator.
    if (buffer != null) {
        if (expIndex < buffer.length) {
            return strengthOrder(buffer[expIndex++]);
        } else {
            buffer = null;
            expIndex = 0;
        }
    } else if (swapOrder != 0) {
        if (Character.isSupplementaryCodePoint(swapOrder)) {
            char[] chars = Character.toChars(swapOrder);
            swapOrder = chars[1];
            return chars[0] << 16;
        }
        int order = swapOrder << 16;
        swapOrder = 0;
        return order;
    }
    int ch  = text.next();

    // are we at the end of Normalizer's text?
    if (ch == NormalizerBase.DONE) {
        return NULLORDER;
    }

    int value = ordering.getUnicodeOrder(ch);
    if (value == RuleBasedCollator.UNMAPPED) {
        swapOrder = ch;
        return UNMAPPEDCHARVALUE;
    }
    else if (value >= RuleBasedCollator.CONTRACTCHARINDEX) {
        value = nextContractChar(ch);
    }
    if (value >= RuleBasedCollator.EXPANDCHARINDEX) {
        buffer = ordering.getExpandValueList(value);
        expIndex = 0;
        value = buffer[expIndex++];
    }

    if (ordering.isSEAsianSwapping()) {
        int consonant;
        if (isThaiPreVowel(ch)) {
            consonant = text.next();
            if (isThaiBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
        if (isLaoPreVowel(ch)) {
            consonant = text.next();
            if (isLaoBaseConsonant(consonant)) {
                buffer = makeReorderedBuffer(consonant, value, buffer, true);
                value = buffer[0];
                expIndex = 1;
            } else if (consonant != NormalizerBase.DONE) {
                text.previous();
            }
        }
    }

    return strengthOrder(value);
}
 

/**
 * Get the ordering priority of the next contracting character in the
 * string.
 * @param ch the starting character of a contracting character token
 * @return the next contracting character's ordering.  Returns NULLORDER
 * if the end of string is reached.
 */
private int nextContractChar(int ch)
{
    // First get the ordering of this single character,
    // which is always the first element in the list
    Vector<EntryPair> list = ordering.getContractValues(ch);
    EntryPair pair = list.firstElement();
    int order = pair.value;

    // find out the length of the longest contracting character sequence in the list.
    // There's logic in the builder code to make sure the longest sequence is always
    // the last.
    pair = list.lastElement();
    int maxLength = pair.entryName.length();

    // (the Normalizer is cloned here so that the seeking we do in the next loop
    // won't affect our real position in the text)
    NormalizerBase tempText = (NormalizerBase)text.clone();

    // extract the next maxLength characters in the string (we have to do this using the
    // Normalizer to ensure that our offsets correspond to those the rest of the
    // iterator is using) and store it in "fragment".
    tempText.previous();
    key.setLength(0);
    int c = tempText.next();
    while (maxLength > 0 && c != NormalizerBase.DONE) {
        if (Character.isSupplementaryCodePoint(c)) {
            key.append(Character.toChars(c));
            maxLength -= 2;
        } else {
            key.append((char)c);
            --maxLength;
        }
        c = tempText.next();
    }
    String fragment = key.toString();
    // now that we have that fragment, iterate through this list looking for the
    // longest sequence that matches the characters in the actual text.  (maxLength
    // is used here to keep track of the length of the longest sequence)
    // Upon exit from this loop, maxLength will contain the length of the matching
    // sequence and order will contain the collation-element value corresponding
    // to this sequence
    maxLength = 1;
    for (int i = list.size() - 1; i > 0; i--) {
        pair = list.elementAt(i);
        if (!pair.fwd)
            continue;

        if (fragment.startsWith(pair.entryName) && pair.entryName.length()
                > maxLength) {
            maxLength = pair.entryName.length();
            order = pair.value;
        }
    }

    // seek our current iteration position to the end of the matching sequence
    // and return the appropriate collation-element value (if there was no matching
    // sequence, we're already seeked to the right position and order already contains
    // the correct collation-element value for the single character)
    while (maxLength > 1) {
        c = text.next();
        maxLength -= Character.charCount(c);
    }
    return order;
}