jakarta.mail.internet.ContentDisposition Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.mail.internet;
/**
* 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 static final boolean contentDispositionStrict =
MimeUtility.getBooleanSystemProperty("mail.mime.contentdisposition.strict", true);
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.
* @throws 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) {
if (contentDispositionStrict) {
throw new ParseException("Expected disposition, got " +
tk.getValue());
}
} else {
disposition = tk.getValue();
}
// Then parameters ..
String rem = h.getRemainder();
if (rem != null) {
try {
list = new ParameterList(rem);
} catch (ParseException px) {
if (contentDispositionStrict) {
throw px;
}
}
}
}
/**
* Return the disposition value.
*
* @return the disposition
* @since JavaMail 1.2
*/
public String getDisposition() {
return disposition;
}
/**
* Return the specified parameter value. Returns null
* if this parameter is absent.
*
* @param name the parameter name
* @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 an empty string if
* the conversion failed.
*
* @return RFC2045 style string
* @since JavaMail 1.2
*/
@Override
public String toString() {
if (disposition == null)
return "";
if (list == null)
return disposition;
StringBuilder sb = new StringBuilder(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();
}
}