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ICU-8899 Switch to StringBuilder for buffer.
X-SVN-Rev: 30974
This commit is contained in:
Abhinav Gupta
parent
3280110b3c
commit
4b1538b4f9
1 changed files with 50 additions and 52 deletions
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@ -19,10 +19,22 @@ import com.ibm.icu.impl.locale.AsciiUtil;
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* Utility class to parse and normalize locale ids (including POSIX style)
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*/
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public final class LocaleIDParser {
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/**
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* Char array representing the locale ID.
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*/
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private char[] id;
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/**
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* Current position in {@link #id} (while parsing).
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*/
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private int index;
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private char[] buffer;
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private int blen;
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/**
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* Temporary buffer for parsed sections of data.
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*/
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private StringBuilder buffer;
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// um, don't handle POSIX ids unless we request it. why not? well... because.
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private boolean canonicalize;
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private boolean hadCountry;
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@ -49,38 +61,24 @@ public final class LocaleIDParser {
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public LocaleIDParser(String localeID, boolean canonicalize) {
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id = localeID.toCharArray();
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index = 0;
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buffer = new char[id.length + 5];
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blen = 0;
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buffer = new StringBuilder(id.length + 5);
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this.canonicalize = canonicalize;
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}
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private void reset() {
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index = blen = 0;
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index = 0;
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buffer = new StringBuilder(id.length + 5);
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}
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// utilities for working on text in the buffer
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private void resizeBuffer(int newSize) {
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if (newSize > 1024) {
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// if buffer is too large, something is wrong. die.
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throw new IndexOutOfBoundsException("Buffer has grown too large.");
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}
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char[] nbuffer = new char[newSize];
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System.arraycopy(buffer, 0, nbuffer, 0, Math.min(buffer.length, newSize));
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buffer = nbuffer;
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}
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/**
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* Append c to the buffer.
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*/
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private void append(char c) {
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if (blen >= buffer.length) {
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resizeBuffer(buffer.length * 2);
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}
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buffer[blen++] = c;
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buffer.append(c);
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}
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private void addSeparator() {
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append(UNDERSCORE);
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}
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@ -89,31 +87,22 @@ public final class LocaleIDParser {
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* Returns the text in the buffer from start to blen as a String.
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*/
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private String getString(int start) {
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if (start == blen) {
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return "";
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}
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return new String(buffer, start, blen-start);
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return buffer.substring(start);
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}
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/**
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* Set the length of the buffer to pos, then append the string.
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*/
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private void set(int pos, String s) {
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this.blen = pos; // no safety
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append(s);
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buffer.delete(pos, buffer.length());
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buffer.insert(pos, s);
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}
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/**
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* Append the string to the buffer.
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*/
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private void append(String s) {
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int slen = s.length();
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if (blen + slen > buffer.length) {
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resizeBuffer(buffer.length * 2 + slen);
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}
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for (int i = 0; i < slen; ++i) {
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buffer[blen++] = s.charAt(i);
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}
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buffer.append(s);
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}
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// utilities for parsing text out of the id
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@ -202,6 +191,8 @@ public final class LocaleIDParser {
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* separator. Returns the start of the language code in the buffer.
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*/
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private int parseLanguage() {
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int startLength = buffer.length();
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if (haveExperimentalLanguagePrefix()) {
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append(Character.toLowerCase(id[0]));
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append(HYPHEN);
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@ -214,7 +205,7 @@ public final class LocaleIDParser {
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}
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--index; // unget
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if (blen == 3) {
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if (buffer.length() - startLength == 3) {
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String lang = LocaleIDs.threeToTwoLetterLanguage(getString(0));
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if (lang != null) {
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set(0, lang);
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@ -249,12 +240,14 @@ public final class LocaleIDParser {
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int oldIndex = index; // save original index
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++index;
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int oldBlen = blen; // get before append hyphen, if we truncate everything is undone
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int oldBlen = buffer.length(); // get before append hyphen, if we truncate everything is undone
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char c;
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boolean firstPass = true;
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while(!isTerminatorOrIDSeparator(c = next())) {
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if (blen == oldBlen) { // first pass
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if (firstPass) {
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addSeparator();
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append(Character.toUpperCase(c));
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firstPass = false;
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} else {
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append(Character.toLowerCase(c));
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}
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@ -264,14 +257,14 @@ public final class LocaleIDParser {
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/* If it's not exactly 4 characters long, then it's not a script. */
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if (index - oldIndex != 5) { // +1 to account for separator
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index = oldIndex;
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blen = oldBlen;
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buffer.delete(oldBlen, buffer.length());
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} else {
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oldBlen++; // index past hyphen, for clients who want to extract just the script
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}
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return oldBlen;
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}
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return blen;
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return buffer.length();
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}
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/**
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@ -303,19 +296,21 @@ public final class LocaleIDParser {
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int oldIndex = index;
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++index;
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int oldBlen = blen;
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int oldBlen = buffer.length();
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char c;
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boolean firstPass = true;
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while (!isTerminatorOrIDSeparator(c = next())) {
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if (oldBlen == blen) { // first, add hyphen
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if (firstPass) { // first, add hyphen
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hadCountry = true; // we have a country, let variant parsing know
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addSeparator();
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++oldBlen; // increment past hyphen
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firstPass = false;
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}
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append(Character.toUpperCase(c));
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}
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--index; // unget
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int charsAppended = blen - oldBlen;
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int charsAppended = buffer.length() - oldBlen;
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if (charsAppended == 0) {
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// Do nothing.
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@ -325,7 +320,7 @@ public final class LocaleIDParser {
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// their previous values.
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index = oldIndex;
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--oldBlen;
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blen = oldBlen;
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buffer.delete(oldBlen, buffer.length());
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hadCountry = false;
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}
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else if (charsAppended == 3) {
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@ -338,7 +333,7 @@ public final class LocaleIDParser {
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return oldBlen;
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}
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return blen;
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return buffer.length();
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}
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/**
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@ -388,12 +383,14 @@ public final class LocaleIDParser {
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* becomes a bit more complex.
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*/
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private int parseVariant() {
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int oldBlen = blen;
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int oldBlen = buffer.length();
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boolean start = true;
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boolean needSeparator = true;
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boolean skipping = false;
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char c;
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boolean firstPass = true;
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while ((c = next()) != DONE) {
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if (c == DOT) {
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start = false;
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@ -409,15 +406,15 @@ public final class LocaleIDParser {
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start = false;
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} else if (!skipping) {
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if (needSeparator) {
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boolean incOldBlen = blen == oldBlen; // need to skip separators
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needSeparator = false;
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if (incOldBlen && !hadCountry) { // no country, we'll need two
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if (firstPass && !hadCountry) { // no country, we'll need two
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addSeparator();
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++oldBlen; // for sure
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}
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addSeparator();
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if (incOldBlen) { // only for the first separator
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if (firstPass) { // only for the first separator
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++oldBlen;
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firstPass = false;
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}
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}
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c = Character.toUpperCase(c);
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@ -501,8 +498,9 @@ public final class LocaleIDParser {
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parseVariant();
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// catch unwanted trailing underscore after country if there was no variant
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if (blen > 1 && buffer[blen-1] == UNDERSCORE) {
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--blen;
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int len = buffer.length();
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if (len > 0 && buffer.charAt(len - 1) == UNDERSCORE) {
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buffer.deleteCharAt(len - 1);
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}
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}
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}
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@ -637,7 +635,7 @@ public final class LocaleIDParser {
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* Parse the keywords and return start of the string in the buffer.
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*/
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private int parseKeywords() {
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int oldBlen = blen;
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int oldBlen = buffer.length();
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Map<String, String> m = getKeywordMap();
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if (!m.isEmpty()) {
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boolean first = true;
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@ -648,7 +646,7 @@ public final class LocaleIDParser {
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append(KEYWORD_ASSIGN);
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append(e.getValue());
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}
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if (blen != oldBlen) {
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if (first == false) {
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++oldBlen;
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}
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}
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