/*
* Copyright (c) 2007 Mozilla Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package org.whattf.datatype;
import org.relaxng.datatype.DatatypeException;
public class MimeType extends AbstractDatatype {
/**
* The singleton instance.
*/
public static final MimeType THE_INSTANCE = new MimeType();
private enum State {
AT_START, IN_SUPERTYPE, AT_SUBTYPE_START, IN_SUBTYPE, SEMICOLON_SEEN, WS_BEFORE_SEMICOLON, IN_PARAM_NAME, EQUALS_SEEN, IN_QUOTED_STRING, IN_UNQUOTED_STRING, IN_QUOTED_PAIR, CLOSE_QUOTE_SEEN
}
private MimeType() {
super();
}
@Override
public void checkValid(CharSequence literal) throws DatatypeException {
State state = State.AT_START;
for (int i = 0; i < literal.length(); i++) {
char c = literal.charAt(i);
switch (state) {
case AT_START:
if (isTokenChar(c)) {
state = State.IN_SUPERTYPE;
continue;
} else {
throw newDatatypeException(i,
"Expected a token character but saw ",
c, " instead.");
}
case IN_SUPERTYPE:
if (isTokenChar(c)) {
continue;
} else if (c == '/') {
state = State.AT_SUBTYPE_START;
continue;
} else {
throw newDatatypeException(i,
"Expected a token character or \u201C/\u201D but saw ",
c, " instead.");
}
case AT_SUBTYPE_START:
if (isTokenChar(c)) {
state = State.IN_SUBTYPE;
continue;
} else {
throw newDatatypeException(i,
"Expected a token character but saw ",
c, " instead.");
}
case IN_SUBTYPE:
if (isTokenChar(c)) {
continue;
} else if (c == ';') {
state = State.SEMICOLON_SEEN;
continue;
} else if (isWhitespace(c)) {
state = State.WS_BEFORE_SEMICOLON;
continue;
} else {
throw newDatatypeException(i,
"Expected a token character, whitespace or a semicolon but saw ",
c, " instead.");
}
case WS_BEFORE_SEMICOLON:
if (isWhitespace(c)) {
continue;
} else if (c == ';') {
state = State.SEMICOLON_SEEN;
continue;
} else {
throw newDatatypeException(i,
"Expected whitespace or a semicolon but saw ",
c, " instead.");
}
case SEMICOLON_SEEN:
if (isWhitespace(c)) {
continue;
} else if (isTokenChar(c)) {
state = State.IN_PARAM_NAME;
continue;
} else {
throw newDatatypeException(i,
"Expected whitespace or a token character but saw ",
c, " instead.");
}
case IN_PARAM_NAME:
if (isTokenChar(c)) {
continue;
} else if (c == '=') {
state = State.EQUALS_SEEN;
continue;
}
case EQUALS_SEEN:
if (c == '\"') {
state = State.IN_QUOTED_STRING;
continue;
} else if (isTokenChar(c)) {
state = State.IN_UNQUOTED_STRING;
continue;
} else {
throw newDatatypeException(i,
"Expected a double quote or a token character but saw ",
c, " instead.");
}
case IN_QUOTED_STRING:
if (c == '\\') {
state = State.IN_QUOTED_PAIR;
continue;
} else if (c == '\"') {
state = State.CLOSE_QUOTE_SEEN;
continue;
} else if (isQDTextChar(c)) {
continue;
} else {
throw newDatatypeException(i,
"Expected a non-control ASCII character but saw ",
c, " instead.");
}
case IN_QUOTED_PAIR:
if (c <= 127) {
state = State.IN_QUOTED_STRING;
continue;
} else {
throw newDatatypeException(i,
"Expected an ASCII character but saw ",
c, " instead.");
}
case CLOSE_QUOTE_SEEN:
if (c == ';') {
state = State.SEMICOLON_SEEN;
continue;
} else if (isWhitespace(c)) {
state = State.WS_BEFORE_SEMICOLON;
continue;
} else {
throw newDatatypeException(i,
"Expected an ASCII character but saw ",
c, " instead.");
}
case IN_UNQUOTED_STRING:
if (isTokenChar(c)) {
continue;
} else if (c == ';') {
state = State.SEMICOLON_SEEN;
continue;
} else if (isWhitespace(c)) {
state = State.WS_BEFORE_SEMICOLON;
continue;
} else {
throw newDatatypeException(i,
"Expected a token character, whitespace or a semicolon but saw ",
c, " instead.");
}
}
}
switch (state) {
case IN_SUBTYPE:
case IN_UNQUOTED_STRING:
case CLOSE_QUOTE_SEEN:
return;
case AT_START:
throw newDatatypeException(
"Expected a MIME type but saw the empty string.");
case IN_SUPERTYPE:
case AT_SUBTYPE_START:
throw newDatatypeException(literal.length() - 1,
"Subtype missing.");
case EQUALS_SEEN:
case IN_PARAM_NAME:
throw newDatatypeException(literal.length() - 1,
"Parameter value missing.");
case IN_QUOTED_PAIR:
case IN_QUOTED_STRING:
throw newDatatypeException(literal.length() - 1,
"Unfinished quoted string.");
case SEMICOLON_SEEN:
throw newDatatypeException(literal.length() - 1,
"Semicolon seen but there was no parameter following it.");
case WS_BEFORE_SEMICOLON:
throw newDatatypeException(literal.length() - 1,
"Extraneous trailing whitespace.");
}
}
private boolean isQDTextChar(char c) {
return (c >= ' ' && c <= 126) || (c == '\n') || (c == '\r')
|| (c == '\t');
}
private boolean isTokenChar(char c) {
return (c >= 33 && c <= 126)
&& !(c == '(' || c == ')' || c == '<' || c == '>' || c == '@'
|| c == ',' || c == ';' || c == ':' || c == '\\'
|| c == '\"' || c == '/' || c == '[' || c == ']'
|| c == '?' || c == '=' || c == '{' || c == '}');
}
@Override
public String getName() {
return "MIME type";
}
}