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/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 1999-2003 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id: JavaNaming.java 6216 2006-09-15 23:26:59Z rjoachim $
 */

package org.exolab.castor.xml;

import java.io.File;
import java.util.Hashtable;

/**
 * This class converts XML Names to proper Java names.
 * Also see Unmarshaller and Marshaller since they use some
 * of their own methods for now.
 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
 * @version $Revision: 6216 $ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
**/
public class JavaNaming {


    /**
     * The property name to use in the castor.properties file to specify
     * the value of the <code>upperCaseAfterUnderscore</code> variable.
     */
    public static final String UPPER_CASE_AFTER_UNDERSCORE_PROPERTY 
        = "org.exolab.castor.xml.JavaNaming.upperCaseAfterUnderscore";
    
    /**
     * Used for backward compatibility, if you wish
     * to be backward compatible with 0.9.3.9 and earlier
     * set this boolean to true.
     */
    public static boolean upperCaseAfterUnderscore = false;
    
    
    private static final Hashtable subst = keywordMap();

    private static final String[] keywords = {
        "abstract",
        "boolean",
        "break",
        "byte",
        "case",
        "catch",
        "char",
        "class",
        "const",
        "continue",
        "default",
        "do",
        "double",
        "else",
        "extends",
        "false",
        "final",
        "finally",
        "float",
        "for",
        "goto",
        "if",
        "implements",
        "import",
        "instanceof",
        "int",
        "interface",
        "long",
        "native",
        "new",
        "null",
        "package",
        "private",
        "protected",
        "public",
        "return",
        "short",
        "static",
        "super",
        "switch",
        "synchronized",
        "this",
        "throw",
        "throws",
        "transient",
        "true",
        "try",
        "void",
        "volatile",
        "while"
    }; //-- keywords

    /**
     * private constructor
    **/
    private JavaNaming() {
        super();
    } //-- JavaNaming

    /**
     * Returns true if the given String is a Java keyword which
     * will cause a problem when used as a variable name
    **/
    public static boolean isKeyword(String name) {
        if (name == null) return false;
        for (int i = 0; i < keywords.length; i++) {
            if (keywords[i].equals(name)) return true;
        }
        return false;
    } //-- isKeyword

    /**
     * Returns true if the given String matches the production of a valid Java identifier.
     *
     * @param string The String to check the production of.
     * @return true if the given String matches the production of a valid Java name,
     *         otherwise false.
     */
    public static boolean isValidJavaIdentifier(String string) {
        if ((string == null) || (string.length() == 0))
            return false;

        for (int i = 0; i < string.length(); i++) {
            char ch = string.charAt(i);

            //-- digit
            if (ch == '_') continue;
            if (ch == '$') continue;

            if ((ch >= 'A') && (ch <= 'Z')) continue;
            if ((ch >= 'a') && (ch <= 'z')) continue;
            if ((ch >= '0') && (ch <= '9')) {
                if (i == 0) return false;
                continue;
            }

            return false;
        }
        if (isKeyword(string)) return false;
        return true;
    } //-- isValidJavaIdentifier

    public static String toJavaClassName(String name) {

        if ((name == null) || (name.length() <= 0)) {
           // handle error
           return name; //-- for now just return name
        }
    // Remove namespace prefix (Andrew Fawcett, temporary until namespace changes go in)
        int colon = name.indexOf(':');
        if (colon != -1)
            name = name.substring(colon + 1);
        return toJavaName(name, true);

    } //-- toJavaClassName

    public static String toJavaMemberName(String name) {
        return toJavaMemberName(name, true);
    } //-- toJavaMemberName

    public static String toJavaMemberName
        (String name, boolean useKeywordSubstitutions)
    {

        if (name == null) return null;

        String memberName = toJavaName(name, false);

        if (isKeyword(memberName) && useKeywordSubstitutions) {
            String mappedName = (String) subst.get(memberName);
            if (mappedName != null) memberName = mappedName;
            else memberName = "_"+memberName;
        }
        return memberName;
    } //-- toJavaMemberName

    /**
     * Converts the given Package name to it's corresponding
     * Path. The path will be a relative path.
    **/
    public static String packageToPath(String packageName) {
        if (packageName == null) return packageName;
        return packageName.replace('.',File.separatorChar);
    } //-- packageToPath

    private static Hashtable keywordMap() {
        Hashtable ht = new Hashtable();
        ht.put("class", "clazz");
        return ht;
    } //-- keywordMap

    /**
     * Converts the given xml name to a Java name.
     * @param name the name to convert to a Java Name
     * @param upperFirst a flag to indicate whether or not the
     * the first character should be converted to uppercase.
    **/
    private static String toJavaName(String name, boolean upperFirst) {

        int size = name.length();
        char[] ncChars = name.toCharArray();
        int next = 0;

        boolean uppercase = upperFirst;
        
        //-- initialize lowercase, this is either (!uppercase) or
        //-- false depending on if the first two characters
        //-- are uppercase
        boolean lowercase = (!uppercase);
        if ((size > 1) && lowercase) {
            if (Character.isUpperCase(ncChars[0]) && 
                Character.isUpperCase(ncChars[1]))
                lowercase = false;
        }

        for (int i = 0; i < size; i++) {
            char ch = ncChars[i];

            switch(ch) {
                case '.':
        case ' ':
                    ncChars[next++] = '_';
                    break;
                case ':':
                case '-':
                    uppercase = true;
                    break;
                case '_':
                    //-- backward compatibility with 0.9.3.9
                    if (upperCaseAfterUnderscore) {
                        uppercase = true;
                        ncChars[next] = ch;
                        ++next;
                        break;
                    }
                    //-- for backward compatibility with 0.9.3
                    /* if (replaceUnderscore) {
                        uppercase = true;
                        break;
                    }
                    */
                    //--> do not break here for anything greater
                    //--> than 0.9.3.9
                default:
                    if (uppercase) {
                        ncChars[next] = Character.toUpperCase(ch);
                        uppercase = false;
                    }
                    else if (lowercase) {
                        ncChars[next] = Character.toLowerCase(ch);
                        lowercase = false;
                    }
                    else ncChars[next] = ch;
                    ++next;
                    break;
            }
        }
        return new String(ncChars,0,next);
    } //-- toJavaName


    /* for debuging 
    public static void main(String[] args) {

        String[] names = {
            "name",
            "myName",
            "my-name",
            "my----name",
            "my_name",
            "NAME"
        };

        System.out.println("JavaXMLNaming Tests: ");
        System.out.println();
        for (int i = 0; i < names.length; i++) {
            System.out.println();
            System.out.print("Test #");
            System.out.println(i+1);
            System.out.print("toJavaClassName(\"");
            System.out.print(names[i]);
            System.out.print("\") ==> \"");
            System.out.print(toJavaClassName(names[i]));
            System.out.println("\"");
            System.out.println();
            System.out.print("toJavaMemberName(\"");
            System.out.print(names[i]);
            System.out.print("\") ==> \"");
            System.out.print(toJavaMemberName(names[i]));
            System.out.println("\"");

        }
    } //-- main /* */

} //-- JavaXMLNaming
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