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package org.pablotron.luigi;
import java.util.Map;
import java.util.HashMap;
import java.nio.charset.Charset;
import org.pablotron.luigi.errors.FilterError;
/**
* Default filter set and filter handler callback.
*/
public final class Filter {
/**
* Hide constructor to prevent instantiation.
*/
private Filter() {}
/**
* Filter handler callback interface.
*/
public static interface Handler {
/**
* Called during template expansion to apply the given filter.
*
* @param val String value.
* @param args Array of filter arguments specified in template string.
* @param row Complete map of arguments passed during template run.
*
* @return Filtered value as a string.
*
* @throws FilterError If an error occurs during filtering.
*/
public String filter(
String val,
String args[],
Map<String, String> row
) throws FilterError;
};
/**
* Convert given string value to byte array.
*
* If the length of the argument array is greater than zero, then the
* first argument is used as the name of a character set for the input
* string.
*
* @param val String value.
* @param args Array of filter arguments. May be empty.
*
* @return Byte array.
*/
private static byte[] getBytes(final String val, final String args[]) {
final Charset charset = (args.length > 0) ? Charset.forName(args[0]) : Charset.defaultCharset();
return val.getBytes(charset);
}
/**
* Convert signed byte to unsigned integer.
*
* @param b Signed byte value.
*
* @return Unsigned integer.
*/
private static int toUInt(final byte b) {
return (b < 0) ? (256 + b) : b;
}
/**
* Default filter set.
*
* The default filters are as follows:
*
* <ul>
* <li><code>uc</code>: Convert string to upper-case.</li>
* <li><code>lc</code>: Convert string to lower-case.</li>
* <li><code>h</code>: HTML-escape string.</li>
* <li><code>u</code>: URL-escape string.</li>
* <li><code>trim</code>: Strip leading and trailing whitespace from string.</li>
* <!-- li><code>base64</code>: Base64-encode value.</li -->
* </ul>
*/
public static Map<String, Handler> FILTERS = new HashMap<String, Handler>() {{
put("null", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return "";
}
});
put("s", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
int v = Integer.parseInt(val);
return (v == 1) ? "" : "s";
}
});
put("uc", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return val.toUpperCase();
}
});
put("lc", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return val.toLowerCase();
}
});
put("length", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return Integer.toString(val.length());
}
});
put("trim", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return val.trim();
}
});
put("h", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
StringBuilder r = new StringBuilder();
final byte bytes[] = getBytes(val, args);
for (int i = 0, l = bytes.length; i < l; i++) {
final byte b = bytes[i];
switch (b) {
case '&':
r.append("&");
break;
case '<':
r.append("<");
break;
case '>':
r.append(">");
break;
case '\'':
r.append("'");
break;
case '"':
r.append(""");
break;
default:
if (b < 32 || b > 126) {
r.append(String.format("&#%d;", toUInt(b)));
} else {
r.append((char) b);
}
}
}
return r.toString();
}
});
put("u", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
final StringBuilder r = new StringBuilder();
final byte bytes[] = getBytes(val, args);
for (int i = 0, l = bytes.length; i < l; i++) {
final byte b = bytes[i];
switch (b) {
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
case 'g':
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o':
case 'p':
case 'q':
case 'r':
case 's':
case 't':
case 'u':
case 'v':
case 'w':
case 'x':
case 'y':
case 'z':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
case '_':
case '.':
case '~':
// unreserved character
r.append((char) b);
break;
case ' ':
r.append("+");
break;
default:
r.append(String.format("%%%02X", toUInt(b)));
}
}
return r.toString();
}
});
put("trim", new Handler() {
public String filter(String val, String args[], Map<String, String> row) {
return val.replaceAll("\\A\\s+|\\s+\\Z", "");
}
});
}};
};
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