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package org.glassfish.jersey.message.internal;
import java.text.ParseException;
import static org.glassfish.jersey.message.internal.GrammarUtil.*;
/**
* Concrete internal implementation of pull-based HTTP reader.
*
* @author Paul Sandoz
* @author Martin Matula (martin.matula at oracle.com)
*/
/* package */ final class HttpHeaderReaderImpl extends HttpHeaderReader {
private String header;
private boolean processComments;
private int index;
private int length;
private Event event;
private String value;
public HttpHeaderReaderImpl(String header, boolean processComments) {
this.header = (header == null) ? "" : header;
this.processComments = processComments;
this.index = 0;
this.length = this.header.length();
}
public HttpHeaderReaderImpl(String header) {
this(header, false);
}
@Override
public boolean hasNext() {
return skipWhiteSpace();
}
@Override
public boolean hasNextSeparator(char separator, boolean skipWhiteSpace) {
if (skipWhiteSpace) {
skipWhiteSpace();
}
if (index >= length) {
return false;
}
char c = header.charAt(index);
return isSeparator(c) && c == separator;
}
@Override
public String nextSeparatedString(char startSeparator, char endSeparator) throws ParseException {
nextSeparator(startSeparator);
final int start = index;
for (; index < length; index++) {
if (header.charAt(index) == endSeparator) {
break;
}
}
if (start == index) {
// no token between separators
throw new ParseException("No characters between the separators "
+ "'" + startSeparator + "' and '" + endSeparator + "'", index);
} else if (index == length) {
// no end separator
throw new ParseException("No end separator '" + endSeparator + "'", index);
}
event = Event.Token;
return value = header.substring(start, index++);
}
@Override
public Event next() throws ParseException {
return next(true);
}
@Override
public Event next(boolean skipWhiteSpace) throws ParseException {
return next(skipWhiteSpace, false);
}
@Override
public Event next(boolean skipWhiteSpace, boolean preserveBackslash) throws ParseException {
return event = process(getNextCharacter(skipWhiteSpace), preserveBackslash);
}
@Override
public Event getEvent() {
return event;
}
@Override
public String getEventValue() {
return value;
}
@Override
public String getRemainder() {
return (index < length) ? header.substring(index) : null;
}
@Override
public int getIndex() {
return index;
}
private boolean skipWhiteSpace() {
for (; index < length; index++) {
if (!isWhiteSpace(header.charAt(index))) {
return true;
}
}
return false;
}
private char getNextCharacter(boolean skipWhiteSpace) throws ParseException {
if (skipWhiteSpace) {
skipWhiteSpace();
}
if (index >= length) {
throw new ParseException("End of header", index);
}
return header.charAt(index);
}
private Event process(char c, boolean preserveBackslash) throws ParseException {
if (c > 127) {
index++;
return Event.Control;
}
switch (getType(c)) {
case TOKEN: {
final int start = index;
for (index++; index < length; index++) {
if (!isToken(header.charAt(index))) {
break;
}
}
value = header.substring(start, index);
return Event.Token;
}
case QUOTED_STRING:
processQuotedString(preserveBackslash);
return Event.QuotedString;
case COMMENT:
if (!processComments) {
throw new ParseException("Comments are not allowed", index);
}
processComment();
return Event.Comment;
case SEPARATOR:
index++;
value = String.valueOf(c);
return Event.Separator;
case CONTROL:
index++;
value = String.valueOf(c);
return Event.Control;
default:
// White space
throw new ParseException("White space not allowed", index);
}
}
private void processComment() throws ParseException {
boolean filter = false;
int nesting;
int start;
for (start = ++index, nesting = 1;
nesting > 0 && index < length;
index++) {
char c = header.charAt(index);
if (c == '\\') {
index++;
filter = true;
} else if (c == '\r') {
filter = true;
} else if (c == '(') {
nesting++;
} else if (c == ')') {
nesting--;
}
}
if (nesting != 0) {
throw new ParseException("Unbalanced comments", index);
}
value = (filter)
? filterToken(header, start, index - 1)
: header.substring(start, index - 1);
}
private void processQuotedString(boolean preserveBackslash) throws ParseException {
boolean filter = false;
for (int start = ++index; index < length; index++) {
char c = this.header.charAt(index);
if (!preserveBackslash && c == '\\') {
index++;
filter = true;
} else if (c == '\r') {
filter = true;
} else if (c == '"') {
value = (filter)
? filterToken(header, start, index, preserveBackslash)
: header.substring(start, index);
index++;
return;
}
}
throw new ParseException("Unbalanced quoted string", index);
}
}