/**
* Copyright 2005-2014 Restlet
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: Apache 2.0 or or EPL 1.0 (the "Licenses"). You can
* select the license that you prefer but you may not use this file except in
* compliance with one of these Licenses.
*
* You can obtain a copy of the Apache 2.0 license at
* http://www.opensource.org/licenses/apache-2.0
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://restlet.com/products/restlet-framework
*
* Restlet is a registered trademark of Restlet S.A.S.
*/
package org.restlet.engine.header;
import java.io.IOException;
import org.restlet.data.CharacterSet;
import org.restlet.data.MediaType;
import org.restlet.data.Parameter;
import org.restlet.util.Series;
/**
* Content type header reader.
*
* @author Jerome Louvel
*/
public class ContentTypeReader extends HeaderReader<ContentType> {
/**
* Constructor.
*
* @param header
* The header to read.
*/
public ContentTypeReader(String header) {
super(header);
}
/**
* Creates a content type.
*
* @param mediaType
* The media type name.
* @param parameters
* The parameters parsed.
* @return The content type.
*/
private ContentType createContentType(StringBuilder mediaType,
Series<Parameter> parameters) {
// Attempt to extract the character set
CharacterSet characterSet = null;
if (parameters != null) {
String charSet = parameters.getFirstValue("charset");
if (charSet != null) {
parameters.removeAll("charset");
characterSet = new CharacterSet(charSet);
}
return new ContentType(new MediaType(mediaType.toString(),
parameters), characterSet);
}
return new ContentType(new MediaType(mediaType.toString()), null);
}
@Override
public ContentType readValue() throws IOException {
ContentType result = null;
boolean readingMediaType = true;
boolean readingParamName = false;
boolean readingParamValue = false;
StringBuilder mediaTypeBuffer = new StringBuilder();
StringBuilder paramNameBuffer = null;
StringBuilder paramValueBuffer = null;
Series<Parameter> parameters = null;
String nextValue = readRawValue();
int nextIndex = 0;
if (nextValue != null) {
int nextChar = nextValue.charAt(nextIndex++);
while (result == null) {
if (readingMediaType) {
if (nextChar == -1) {
if (mediaTypeBuffer.length() > 0) {
// End of metadata section
// No parameters detected
result = createContentType(mediaTypeBuffer, null);
paramNameBuffer = new StringBuilder();
} else {
// Ignore empty metadata name
}
} else if (nextChar == ';') {
if (mediaTypeBuffer.length() > 0) {
// End of mediaType section
// Parameters detected
readingMediaType = false;
readingParamName = true;
paramNameBuffer = new StringBuilder();
// [ifndef gwt] instruction
parameters = new Series<Parameter>(Parameter.class);
// [ifdef gwt] instruction uncomment
// parameters = new
// org.restlet.engine.util.ParameterSeries();
} else {
throw new IOException(
"Empty mediaType name detected.");
}
} else if (HeaderUtils.isSpace(nextChar)) {
// Ignore spaces
} else if (HeaderUtils.isText(nextChar)) {
mediaTypeBuffer.append((char) nextChar);
} else {
throw new IOException(
"The "
+ (char) nextChar
+ " character isn't allowed in a media type name.");
}
} else if (readingParamName) {
if (nextChar == '=') {
if (paramNameBuffer.length() > 0) {
// End of parameter name section
readingParamName = false;
readingParamValue = true;
paramValueBuffer = new StringBuilder();
} else {
throw new IOException(
"Empty parameter name detected.");
}
} else if (nextChar == -1) {
if (paramNameBuffer.length() > 0) {
// End of parameters section
parameters.add(Parameter.create(paramNameBuffer,
null));
result = createContentType(mediaTypeBuffer,
parameters);
} else if (paramNameBuffer.length() == 0) {
result = createContentType(mediaTypeBuffer,
parameters);
} else {
throw new IOException(
"Empty parameter name detected.");
}
} else if (nextChar == ';') {
// End of parameter
parameters.add(Parameter.create(paramNameBuffer, null));
paramNameBuffer = new StringBuilder();
readingParamName = true;
readingParamValue = false;
} else if (HeaderUtils.isSpace(nextChar)
&& (paramNameBuffer.length() == 0)) {
// Ignore white spaces
} else if (HeaderUtils.isTokenChar(nextChar)) {
paramNameBuffer.append((char) nextChar);
} else {
throw new IOException(
"The \""
+ (char) nextChar
+ "\" character isn't allowed in a media type parameter name.");
}
} else if (readingParamValue) {
if (nextChar == -1) {
if (paramValueBuffer.length() > 0) {
// End of parameters section
parameters.add(Parameter.create(paramNameBuffer,
paramValueBuffer));
result = createContentType(mediaTypeBuffer,
parameters);
} else {
throw new IOException(
"Empty parameter value detected");
}
} else if (nextChar == ';') {
// End of parameter
parameters.add(Parameter.create(paramNameBuffer,
paramValueBuffer));
paramNameBuffer = new StringBuilder();
readingParamName = true;
readingParamValue = false;
} else if ((nextChar == '"')
&& (paramValueBuffer.length() == 0)) {
// Parse the quoted string
boolean done = false;
boolean quotedPair = false;
while ((!done) && (nextChar != -1)) {
nextChar = (nextIndex < nextValue.length()) ? nextValue
.charAt(nextIndex++) : -1;
if (quotedPair) {
// End of quoted pair (escape sequence)
if (HeaderUtils.isText(nextChar)) {
paramValueBuffer.append((char) nextChar);
quotedPair = false;
} else {
throw new IOException(
"Invalid character \""
+ (char) nextChar
+ "\" detected in quoted string. Please check your value");
}
} else if (HeaderUtils.isDoubleQuote(nextChar)) {
// End of quoted string
done = true;
} else if (nextChar == '\\') {
// Begin of quoted pair (escape sequence)
quotedPair = true;
} else if (HeaderUtils.isText(nextChar)) {
paramValueBuffer.append((char) nextChar);
} else {
throw new IOException(
"Invalid character \""
+ (char) nextChar
+ "\" detected in quoted string. Please check your value");
}
}
} else if (HeaderUtils.isTokenChar(nextChar)) {
paramValueBuffer.append((char) nextChar);
} else {
throw new IOException(
"The \""
+ (char) nextChar
+ "\" character isn't allowed in a media type parameter value.");
}
}
nextChar = (nextIndex < nextValue.length()) ? nextValue
.charAt(nextIndex++) : -1;
}
}
return result;
}
}