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package org.codehaus.plexus.interpolation.util;

/**
 * Code here was swiped from plexus-utils' StringUtils class, so
 * plexus-interpolation could be completely self-contained.
 *
 * @author jdcasey
 */
public class StringUtils {

    /**
     * <p>Replace all occurrences of a String within another String.</p>
     *
     * <p>A <code>null</code> reference passed to this method is a no-op.</p>
     *
     * @see #replace(String text, String repl, String with, int max)
     * @param text text to search and replace in
     * @param repl String to search for
     * @param with String to replace with
     * @return the text with any replacements processed
     */
    public static String replace(String text, String repl, String with) {
        return replace(text, repl, with, -1);
    }

    /**
     * <p>Replace a String with another String inside a larger String,
     * for the first <code>max</code> values of the search String.</p>
     *
     * <p>A <code>null</code> reference passed to this method is a no-op.</p>
     *
     * @param text text to search and replace in
     * @param repl String to search for
     * @param with String to replace with
     * @param max maximum number of values to replace, or <code>-1</code> if no maximum
     * @return the text with any replacements processed
     */
    public static String replace(String text, String repl, String with, int max) {
        if ((text == null) || (repl == null) || (with == null) || (repl.length() == 0)) {
            return text;
        }

        StringBuilder buf = new StringBuilder(text.length());
        int start = 0, end;
        while ((end = text.indexOf(repl, start)) != -1) {
            buf.append(text, start, end).append(with);
            start = end + repl.length();

            if (--max == 0) {
                break;
            }
        }
        buf.append(text, start, text.length());
        return buf.toString();
    }

    public static String capitalizeFirstLetter(String data) {
        char firstChar = data.charAt(0);
        char titleCase = Character.toTitleCase(firstChar);
        if (firstChar == titleCase) {
            return data;
        }
        StringBuilder result = new StringBuilder(data.length());
        result.append(titleCase);
        result.append(data, 1, data.length());
        return result.toString();
    }
}
