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package javax.mail.internet;
import javax.mail.*;
import java.util.*;
import java.io.*;
/**
* This class represents a MIME ContentDisposition value. It provides
* methods to parse a ContentDisposition string into individual components
* and to generate a MIME style ContentDisposition string.
*
* @author John Mani
*/
public class ContentDisposition {
private String disposition; // disposition
private ParameterList list; // parameter list
/**
* No-arg Constructor.
*/
public ContentDisposition() { }
/**
* Constructor.
*
* @param disposition disposition
* @param list ParameterList
* @since JavaMail 1.2
*/
public ContentDisposition(String disposition, ParameterList list) {
this.disposition = disposition;
this.list = list;
}
/**
* Constructor that takes a ContentDisposition string. The String
* is parsed into its constituents: dispostion and parameters.
* A ParseException is thrown if the parse fails.
*
* @param s the ContentDisposition string.
* @exception ParseException if the parse fails.
* @since JavaMail 1.2
*/
public ContentDisposition(String s) throws ParseException {
HeaderTokenizer h = new HeaderTokenizer(s, HeaderTokenizer.MIME);
HeaderTokenizer.Token tk;
// First "disposition" ..
tk = h.next();
if (tk.getType() != HeaderTokenizer.Token.ATOM)
throw new ParseException("Expected disposition, got " +
tk.getValue());
disposition = tk.getValue();
// Then parameters ..
String rem = h.getRemainder();
if (rem != null)
list = new ParameterList(rem);
}
/**
* Return the disposition value.
* @return the disposition
* @since JavaMail 1.2
*/
public String getDisposition() {
return disposition;
}
/**
* Return the specified parameter value. Returns <code>null</code>
* if this parameter is absent.
* @return parameter value
* @since JavaMail 1.2
*/
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
* @since JavaMail 1.2
*/
public ParameterList getParameterList() {
return list;
}
/**
* Set the disposition. Replaces the existing disposition.
* @param disposition the disposition
* @since JavaMail 1.2
*/
public void setDisposition(String disposition) {
this.disposition = disposition;
}
/**
* Set the specified parameter. If this parameter already exists,
* it is replaced by this new value.
*
* @param name parameter name
* @param value parameter value
* @since JavaMail 1.2
*/
public void setParameter(String name, String value) {
if (list == null)
list = new ParameterList();
list.set(name, value);
}
/**
* Set a new ParameterList.
* @param list ParameterList
* @since JavaMail 1.2
*/
public void setParameterList(ParameterList list) {
this.list = list;
}
/**
* Retrieve a RFC2045 style string representation of
* this ContentDisposition. Returns <code>null</code> if
* the conversion failed.
*
* @return RFC2045 style string
* @since JavaMail 1.2
*/
public String toString() {
if (disposition == null)
return null;
if (list == null)
return disposition;
StringBuffer sb = new StringBuffer(disposition);
// append the parameter list
// use the length of the string buffer + the length of
// the header name formatted as follows "Content-Disposition: "
sb.append(list.toString(sb.length() + 21));
return sb.toString();
}
}
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