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package javax.mail.internet;
/**
* This class represents a MIME ContentType value. It provides
* methods to parse a ContentType string into individual components
* and to generate a MIME style ContentType string.
*
* @author John Mani
*/
public class ContentType {
private String primaryType; // primary type
private String subType; // subtype
private ParameterList list; // parameter list
/**
* No-arg Constructor.
*/
public ContentType() { }
/**
* Constructor.
*
* @param primaryType primary type
* @param subType subType
* @param list ParameterList
*/
public ContentType(String primaryType, String subType,
ParameterList list) {
this.primaryType = primaryType;
this.subType = subType;
this.list = list;
}
/**
* Constructor that takes a Content-Type string. The String
* is parsed into its constituents: primaryType, subType
* and parameters. A ParseException is thrown if the parse fails.
*
* @param s the Content-Type string.
* @exception ParseException if the parse fails.
*/
public ContentType(String s) throws ParseException {
HeaderTokenizer h = new HeaderTokenizer(s, HeaderTokenizer.MIME);
HeaderTokenizer.Token tk;
// First "type" ..
tk = h.next();
if (tk.getType() != HeaderTokenizer.Token.ATOM)
throw new ParseException("Expected MIME type, got " +
tk.getValue());
primaryType = tk.getValue();
// The '/' separator ..
tk = h.next();
if ((char)tk.getType() != '/')
throw new ParseException("Expected '/', got " + tk.getValue());
// Then "subType" ..
tk = h.next();
if (tk.getType() != HeaderTokenizer.Token.ATOM)
throw new ParseException("Expected MIME subtype, got " +
tk.getValue());
subType = tk.getValue();
// Finally parameters ..
String rem = h.getRemainder();
if (rem != null)
list = new ParameterList(rem);
}
/**
* Return the primary type.
* @return the primary type
*/
public String getPrimaryType() {
return primaryType;
}
/**
* Return the subType.
* @return the subType
*/
public String getSubType() {
return subType;
}
/**
* Return the MIME type string, without the parameters.
* The returned value is basically the concatenation of
* the primaryType, the '/' character and the secondaryType.
*
* @return the type
*/
public String getBaseType() {
return primaryType + '/' + subType;
}
/**
* Return the specified parameter value. Returns <code>null</code>
* if this parameter is absent.
* @return parameter value
*/
public String getParameter(String name) {
if (list == null)
return null;
return list.get(name);
}
/**
* Return a ParameterList object that holds all the available
* parameters. Returns null if no parameters are available.
*
* @return ParameterList
*/
public ParameterList getParameterList() {
return list;
}
/**
* Set the primary type. Overrides existing primary type.
* @param primaryType primary type
*/
public void setPrimaryType(String primaryType) {
this.primaryType = primaryType;
}
/**
* Set the subType. Replaces the existing subType.
* @param subType the subType
*/
public void setSubType(String subType) {
this.subType = subType;
}
/**
* Set the specified parameter. If this parameter already exists,
* it is replaced by this new value.
*
* @param name parameter name
* @param value parameter value
*/
public void setParameter(String name, String value) {
if (list == null)
list = new ParameterList();
list.set(name, value);
}
/**
* Set a new ParameterList.
* @param list ParameterList
*/
public void setParameterList(ParameterList list) {
this.list = list;
}
/**
* Retrieve a RFC2045 style string representation of
* this Content-Type. Returns <code>null</code> if
* the conversion failed.
*
* @return RFC2045 style string
*/
public String toString() {
if (primaryType == null || subType == null) // need both
return null;
StringBuffer sb = new StringBuffer();
sb.append(primaryType).append('/').append(subType);
if (list != null)
// append the parameter list
// use the length of the string buffer + the length of
// the header name formatted as follows "Content-Type: "
sb.append(list.toString(sb.length() + 14));
return sb.toString();
}
/**
* Match with the specified ContentType object. This method
* compares <strong>only the <code>primaryType</code> and
* <code>subType</code> </strong>. The parameters of both operands
* are ignored. <p>
*
* For example, this method will return <code>true</code> when
* comparing the ContentTypes for <strong>"text/plain"</strong>
* and <strong>"text/plain; charset=foobar"</strong>.
*
* If the <code>subType</code> of either operand is the special
* character '*', then the subtype is ignored during the match.
* For example, this method will return <code>true</code> when
* comparing the ContentTypes for <strong>"text/plain"</strong>
* and <strong>"text/*" </strong>
*
* @param cType ContentType to compare this against
*/
public boolean match(ContentType cType) {
// Match primaryType
if (!primaryType.equalsIgnoreCase(cType.getPrimaryType()))
return false;
String sType = cType.getSubType();
// If either one of the subTypes is wildcarded, return true
if ((subType.charAt(0) == '*') || (sType.charAt(0) == '*'))
return true;
// Match subType
if (!subType.equalsIgnoreCase(sType))
return false;
return true;
}
/**
* Match with the specified content-type string. This method
* compares <strong>only the <code>primaryType</code> and
* <code>subType</code> </strong>.
* The parameters of both operands are ignored. <p>
*
* For example, this method will return <code>true</code> when
* comparing the ContentType for <strong>"text/plain"</strong>
* with <strong>"text/plain; charset=foobar"</strong>.
*
* If the <code>subType</code> of either operand is the special
* character '*', then the subtype is ignored during the match.
* For example, this method will return <code>true</code> when
* comparing the ContentType for <strong>"text/plain"</strong>
* with <strong>"text/*" </strong>
*/
public boolean match(String s) {
try {
return match(new ContentType(s));
} catch (ParseException pex) {
return false;
}
}
}