propertiesreader.java

在Struts2中的jar包xwork的源代码.版本为2.0.7

                case 2:
                    if (contains(WHITE_SPACE, c))
                    {
                        // do nothing, eat all white spaces
                        state = 2;
                    }
                    else if (contains(SEPARATORS, c))
                    {
                        // switch to the value parsing state
                        state = 3;
                    }
                    else
                    {
                        // any other character indicates we encoutered the beginning of the value
                        value.append(c);

                        // switch to the value parsing state
                        state = 3;
                    }

                    break;

                case 3:
                    value.append(c);
                    break;
            }
        }

        result[0] = key.toString().trim();
        result[1] = value.toString().trim();

        return result;
    }
    
    /**
     * <p>Unescapes any Java literals found in the <code>String</code> to a
     * <code>Writer</code>.</p> This is a slightly modified version of the
     * StringEscapeUtils.unescapeJava() function in commons-lang that doesn't
     * drop escaped separators (i.e '\,').
     *
     * @param str  the <code>String</code> to unescape, may be null
     * @param delimiter the delimiter for multi-valued properties
     * @return the processed string
     * @throws IllegalArgumentException if the Writer is <code>null</code>
     */
    protected static String unescapeJava(String str, char delimiter)
    {
        if (str == null)
        {
            return null;
        }
        int sz = str.length();
        StringBuffer out = new StringBuffer(sz);
        StringBuffer unicode = new StringBuffer(UNICODE_LEN);
        boolean hadSlash = false;
        boolean inUnicode = false;
        for (int i = 0; i < sz; i++)
        {
            char ch = str.charAt(i);
            if (inUnicode)
            {
                // if in unicode, then we're reading unicode
                // values in somehow
                unicode.append(ch);
                if (unicode.length() == UNICODE_LEN)
                {
                    // unicode now contains the four hex digits
                    // which represents our unicode character
                    try
                    {
                        int value = Integer.parseInt(unicode.toString(), HEX_RADIX);
                        out.append((char) value);
                        unicode.setLength(0);
                        inUnicode = false;
                        hadSlash = false;
                    }
                    catch (NumberFormatException nfe)
                    {
                        throw new RuntimeException("Unable to parse unicode value: " + unicode, nfe);
                    }
                }
                continue;
            }

            if (hadSlash)
            {
                // handle an escaped value
                hadSlash = false;

                if (ch == '\\')
                {
                    out.append('\\');
                }
                else if (ch == '\'')
                {
                    out.append('\'');
                }
                else if (ch == '\"')
                {
                    out.append('"');
                }
                else if (ch == 'r')
                {
                    out.append('\r');
                }
                else if (ch == 'f')
                {
                    out.append('\f');
                }
                else if (ch == 't')
                {
                    out.append('\t');
                }
                else if (ch == 'n')
                {
                    out.append('\n');
                }
                else if (ch == 'b')
                {
                    out.append('\b');
                }
                else if (ch == delimiter)
                {
                    out.append('\\');
                    out.append(delimiter);
                }
                else if (ch == 'u')
                {
                    // uh-oh, we're in unicode country....
                    inUnicode = true;
                }
                else
                {
                    out.append(ch);
                }

                continue;
            }
            else if (ch == '\\')
            {
                hadSlash = true;
                continue;
            }
            out.append(ch);
        }

        if (hadSlash)
        {
            // then we're in the weird case of a \ at the end of the
            // string, let's output it anyway.
            out.append('\\');
        }

        return out.toString();
    }
    
    /**
     * <p>Checks if the object is in the given array.</p>
     *
     * <p>The method returns <code>false</code> if a <code>null</code> array is passed in.</p>
     * 
     * @param array  the array to search through
     * @param objectToFind  the object to find
     * @return <code>true</code> if the array contains the object
     */
    public boolean contains(char[] array, char objectToFind) {
        if (array == null) {
            return false;
        }
        for (int i = 0; i < array.length; i++) {
            if (objectToFind == array[i]) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * <p>Unescapes any Java literals found in the <code>String</code>.
     * For example, it will turn a sequence of <code>'\'</code> and
     * <code>'n'</code> into a newline character, unless the <code>'\'</code>
     * is preceded by another <code>'\'</code>.</p>
     * 
     * @param str  the <code>String</code> to unescape, may be null
     * @return a new unescaped <code>String</code>, <code>null</code> if null string input
     */
    public static String unescapeJava(String str) {
        if (str == null) {
            return null;
        }
        try {
            StringWriter writer = new StringWriter(str.length());
            unescapeJava(writer, str);
            return writer.toString();
        } catch (IOException ioe) {
            // this should never ever happen while writing to a StringWriter
            ioe.printStackTrace();
            return null;
        }
    }

    /**
     * <p>Unescapes any Java literals found in the <code>String</code> to a
     * <code>Writer</code>.</p>
     *
     * <p>For example, it will turn a sequence of <code>'\'</code> and
     * <code>'n'</code> into a newline character, unless the <code>'\'</code>
     * is preceded by another <code>'\'</code>.</p>
     * 
     * <p>A <code>null</code> string input has no effect.</p>
     * 
     * @param out  the <code>Writer</code> used to output unescaped characters
     * @param str  the <code>String</code> to unescape, may be null
     * @throws IllegalArgumentException if the Writer is <code>null</code>
     * @throws IOException if error occurs on underlying Writer
     */
    public static void unescapeJava(Writer out, String str) throws IOException {
        if (out == null) {
            throw new IllegalArgumentException("The Writer must not be null");
        }
        if (str == null) {
            return;
        }
        int sz = str.length();
        StringBuffer unicode = new StringBuffer(4);
        boolean hadSlash = false;
        boolean inUnicode = false;
        for (int i = 0; i < sz; i++) {
            char ch = str.charAt(i);
            if (inUnicode) {
                // if in unicode, then we're reading unicode
                // values in somehow
                unicode.append(ch);
                if (unicode.length() == 4) {
                    // unicode now contains the four hex digits
                    // which represents our unicode character
                    try {
                        int value = Integer.parseInt(unicode.toString(), 16);
                        out.write((char) value);
                        unicode.setLength(0);
                        inUnicode = false;
                        hadSlash = false;
                    } catch (NumberFormatException nfe) {
                        throw new RuntimeException("Unable to parse unicode value: " + unicode, nfe);
                    }
                }
                continue;
            }
            if (hadSlash) {
                // handle an escaped value
                hadSlash = false;
                switch (ch) {
                    case '\\':
                        out.write('\\');
                        break;
                    case '\'':
                        out.write('\'');
                        break;
                    case '\"':
                        out.write('"');
                        break;
                    case 'r':
                        out.write('\r');
                        break;
                    case 'f':
                        out.write('\f');
                        break;
                    case 't':
                        out.write('\t');
                        break;
                    case 'n':
                        out.write('\n');
                        break;
                    case 'b':
                        out.write('\b');
                        break;
                    case 'u':
                        {
                            // uh-oh, we're in unicode country....
                            inUnicode = true;
                            break;
                        }
                    default :
                        out.write(ch);
                        break;
                }
                continue;
            } else if (ch == '\\') {
                hadSlash = true;
                continue;
            }
            out.write(ch);
        }
        if (hadSlash) {
            // then we're in the weird case of a \ at the end of the
            // string, let's output it anyway.
            out.write('\\');
        }
    }
}