public static ContentType valueOf(final CharSequence contentTypeHeader) {
if (contentTypeHeader == null) {
throw new IllegalArgumentException("Input is null.");
}
Pattern pattern = Pattern.compile(PATTERN);
Matcher matcher = pattern.matcher(contentTypeHeader);
if (!matcher.matches()) {
throw new IllegalArgumentException("Input is not a valid content type header string.");
}
String type = matcher.group(1);
String subtype = matcher.group(2);
String charset = matcher.group(3);
return ContentType.create(type, subtype, charset);
}
/**
* Immutable.
*
* @author Matt Bertolini
*/
public final class ContentType {
public static final ContentType APPLICATION_FORM_URLENCODED =
ContentType.create("application", "x-www-form-urlencoded");
/** Default charset as defined by the HTTP protocol. */
private static final String DEFAULT_CHARSET = "ISO-8859-1";
private static final String PATTERN =
"([a-zA-Z\\-\\*]+)/([a-zA-Z0-9.+\\-\\*]+)(?:; *charset=([a-zA-Z0-9-_]*))?";
private final String type;
private final String subtype;
private final String charset;
private ContentType(final String type, final String subtype, final String charset) {
this.type = type;
this.subtype = subtype;
this.charset = charset;
}
public static ContentType create(final String type, final String subtype) {
return create(type, subtype, null);
}
public static ContentType create(final String type, final String subtype, final String charset) {
return new ContentType(type, subtype, charset);
}
public static ContentType valueOf(final CharSequence contentTypeHeader) {
if (contentTypeHeader == null) {
throw new IllegalArgumentException("Input is null.");
}
Pattern pattern = Pattern.compile(PATTERN);
Matcher matcher = pattern.matcher(contentTypeHeader);
if (!matcher.matches()) {
throw new IllegalArgumentException("Input is not a valid content type header string.");
}
String type = matcher.group(1);
String subtype = matcher.group(2);
String charset = matcher.group(3);
return ContentType.create(type, subtype, charset);
}
public String getType() {
return this.type;
}
public String getSubtype() {
return this.subtype;
}
public String getCharset() {
return this.charset;
}
public String getCharsetOrDefault() {
return (this.charset == null) ? DEFAULT_CHARSET : this.charset;
}
public ContentType withCharset(final String charset) {
return create(this.getType(), this.getSubtype(), charset);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(this.type);
sb.append("/");
sb.append(this.subtype);
if (this.charset != null && !this.charset.isEmpty()) {
sb.append(";charset=").append(this.charset);
}
return sb.toString();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ContentType that = (ContentType) o;
if (charset != null ? !charset.equals(that.charset) : that.charset != null) return false;
if (subtype != null ? !subtype.equals(that.subtype) : that.subtype != null) return false;
if (type != null ? !type.equals(that.type) : that.type != null) return false;
return true;
}
@Override
public int hashCode() {
int result = type != null ? type.hashCode() : 0;
result = 31 * result + (subtype != null ? subtype.hashCode() : 0);
result = 31 * result + (charset != null ? charset.hashCode() : 0);
return result;
}
}
