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 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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  */

 package com.sun.xml.internal.bind.api.impl;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.List;

 import java.util.Locale;

 /**

  * Methods that convert strings into various formats.

  *

  * <p>

  * What JAX-RPC name binding tells us is that even such basic method

  * like "isLetter" can be different depending on the situation.

  *

  * For this reason, a whole lot of methods are made non-static,

  * even though they look like they should be static.

  */

 class NameUtil {

     protected boolean isPunct(char c) {

         return c == '-' || c == '.' || c == ':' || c == '_' || c == '\u00b7' || c == '\u0387' || c == '\u06dd' || c == '\u06de';

     }

     protected static boolean isDigit(char c) {

         return c >= '0' && c <= '9' || Character.isDigit(c);

     }

     protected static boolean isUpper(char c) {

         return c >= 'A' && c <= 'Z' || Character.isUpperCase(c);

     }

     protected static boolean isLower(char c) {

         return c >= 'a' && c <= 'z' || Character.isLowerCase(c);

     }

     protected boolean isLetter(char c) {

         return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z' || Character.isLetter(c);

     }

     private String toLowerCase(String s)

     {

         return s.toLowerCase(Locale.ENGLISH);

     }

     private String toUpperCase(char c)

     {

         return String.valueOf(c).toUpperCase(Locale.ENGLISH);

     }

     private String toUpperCase(String s)

     {

         return s.toUpperCase(Locale.ENGLISH);

     }

     /**

      * Capitalizes the first character of the specified string,

      * and de-capitalize the rest of characters.

      */

     public String capitalize(String s) {

         if (!isLower(s.charAt(0)))

             return s;

         StringBuilder sb = new StringBuilder(s.length());

         sb.append(toUpperCase(s.charAt(0)));

         sb.append(toLowerCase(s.substring(1)));

         return sb.toString();

     }

     // Precondition: s[start] is not punctuation

     private int nextBreak(String s, int start) {

         int n = s.length();

         char c1 = s.charAt(start);

         int t1 = classify(c1);

         for (int i=start+1; i<n; i++) {

             // shift (c1,t1) into (c0,t0)

             // char c0 = c1;  --- conceptually, but c0 won't be used

             int t0 = t1;

             c1 = s.charAt(i);

             t1 = classify(c1);

             switch(actionTable[t0*5+t1]) {

             case ACTION_CHECK_PUNCT:

                 if(isPunct(c1)) return i;

                 break;

             case ACTION_CHECK_C2:

                 if (i < n-1) {

                     char c2 = s.charAt(i+1);

                     if (isLower(c2))

                         return i;

                 }

                 break;

             case ACTION_BREAK:

                 return i;

             }

         }

         return -1;

     }

     // the 5-category classification that we use in this code

     // to find work breaks

     static protected final int UPPER_LETTER = 0;

     static protected final int LOWER_LETTER = 1;

     static protected final int OTHER_LETTER = 2;

     static protected final int DIGIT = 3;

     static protected final int OTHER = 4;

     /**

      * Look up table for actions.

      * type0*5+type1 would yield the action to be taken.

      */

     private static final byte[] actionTable = new byte[5*5];

     // action constants. see nextBreak for the meaning

     static private final byte ACTION_CHECK_PUNCT = 0;

     static private final byte ACTION_CHECK_C2 = 1;

     static private final byte ACTION_BREAK = 2;

     static private final byte ACTION_NOBREAK = 3;

     /**

      * Decide the action to be taken given

      * the classification of the preceding character 't0' and

      * the classification of the next character 't1'.

      */

     private static byte decideAction( int t0, int t1 ) {

         if(t0==OTHER && t1==OTHER)  return ACTION_CHECK_PUNCT;

         if(!xor(t0==DIGIT,t1==DIGIT))  return ACTION_BREAK;

         if(t0==LOWER_LETTER && t1!=LOWER_LETTER)    return ACTION_BREAK;

         if(!xor(t0<=OTHER_LETTER,t1<=OTHER_LETTER)) return ACTION_BREAK;

         if(!xor(t0==OTHER_LETTER,t1==OTHER_LETTER)) return ACTION_BREAK;

         if(t0==UPPER_LETTER && t1==UPPER_LETTER)    return ACTION_CHECK_C2;

         return ACTION_NOBREAK;

     }

     private static boolean xor(boolean x,boolean y) {

         return (x&&y) || (!x&&!y);

     }

     static {

         // initialize the action table

         for( int t0=0; t0<5; t0++ )

             for( int t1=0; t1<5; t1++ )

                 actionTable[t0*5+t1] = decideAction(t0,t1);

     }

     /**

      * Classify a character into 5 categories that determine the word break.

      */

     protected int classify(char c0) {

         switch(Character.getType(c0)) {

         case Character.UPPERCASE_LETTER:        return UPPER_LETTER;

         case Character.LOWERCASE_LETTER:        return LOWER_LETTER;

         case Character.TITLECASE_LETTER:

         case Character.MODIFIER_LETTER:

         case Character.OTHER_LETTER:            return OTHER_LETTER;

         case Character.DECIMAL_DIGIT_NUMBER:    return DIGIT;

         default:                                return OTHER;

         }

     }

     /**

      * Tokenizes a string into words and capitalizes the first

      * character of each word.

      *

      * <p>

      * This method uses a change in character type as a splitter

      * of two words. For example, "abc100ghi" will be splitted into

      * {"Abc", "100","Ghi"}.

      */

     public List<String> toWordList(String s) {

         ArrayList<String> ss = new ArrayList<String>();

         int n = s.length();

         for (int i = 0; i < n;) {

             // Skip punctuation

             while (i < n) {

                 if (!isPunct(s.charAt(i)))

                     break;

                 i++;

             }

             if (i >= n) break;

             // Find next break and collect word

             int b = nextBreak(s, i);

             String w = (b == -1) ? s.substring(i) : s.substring(i, b);

             ss.add(escape(capitalize(w)));

             if (b == -1) break;

             i = b;

         }

 //      we can't guarantee a valid Java identifier anyway,

 //      so there's not much point in rejecting things in this way.

 //        if (ss.size() == 0)

 //            throw new IllegalArgumentException("Zero-length identifier");

         return ss;

     }

     protected String toMixedCaseName(List<String> ss, boolean startUpper) {

         StringBuilder sb = new StringBuilder();

         if(!ss.isEmpty()) {

             sb.append(startUpper ? ss.get(0) : toLowerCase(ss.get(0)));

             for (int i = 1; i < ss.size(); i++)

                 sb.append(ss.get(i));

         }

         return sb.toString();

     }

     protected String toMixedCaseVariableName(String[] ss,

                                                   boolean startUpper,

                                                   boolean cdrUpper) {

         if (cdrUpper)

             for (int i = 1; i < ss.length; i++)

                 ss[i] = capitalize(ss[i]);

         StringBuilder sb = new StringBuilder();

         if( ss.length>0 ) {

             sb.append(startUpper ? ss[0] : toLowerCase(ss[0]));

             for (int i = 1; i < ss.length; i++)

                 sb.append(ss[i]);

         }

         return sb.toString();

     }

     /**

      * Formats a string into "THIS_KIND_OF_FORMAT_ABC_DEF".

      *

      * @return

      *      Always return a string but there's no guarantee that

      *      the generated code is a valid Java identifier.

      */

     public String toConstantName(String s) {

         return toConstantName(toWordList(s));

     }

     /**

      * Formats a string into "THIS_KIND_OF_FORMAT_ABC_DEF".

      *

      * @return

      *      Always return a string but there's no guarantee that

      *      the generated code is a valid Java identifier.

      */

     public String toConstantName(List<String> ss) {

         StringBuilder sb = new StringBuilder();

         if( !ss.isEmpty() ) {

             sb.append(toUpperCase(ss.get(0)));

             for (int i = 1; i < ss.size(); i++) {

                 sb.append('_');

                 sb.append(toUpperCase(ss.get(i)));

             }

         }

         return sb.toString();

     }

     /**

      * Escapes characters is the given string so that they can be

      * printed by only using US-ASCII characters.

      *

      * The escaped characters will be appended to the given

      * StringBuffer.

      *

      * @param sb

      *      StringBuffer that receives escaped string.

      * @param s

      *      String to be escaped. <code>s.substring(start)</code>

      *      will be escaped and copied to the string buffer.

      */

     public static void escape(StringBuilder sb, String s, int start) {

         int n = s.length();

         for (int i = start; i < n; i++) {

             char c = s.charAt(i);

             if (Character.isJavaIdentifierPart(c))

                 sb.append(c);

             else {

                 sb.append('_');

                 if (c <= '\u000f') sb.append("000");

                 else if (c <= '\u00ff') sb.append("00");

                 else if (c <= '\u0fff') sb.append('0');

                 sb.append(Integer.toString(c, 16));

             }

         }

     }

     /**

      * Escapes characters that are unusable as Java identifiers

      * by replacing unsafe characters with safe characters.

      */

     private static String escape(String s) {

         int n = s.length();

         for (int i = 0; i < n; i++)

             if (!Character.isJavaIdentifierPart(s.charAt(i))) {

                 StringBuilder sb = new StringBuilder(s.substring(0, i));

                 escape(sb, s, i);

                 return sb.toString();

             }

         return s;

     }

 }