StreamInitiation.java
/**
*
* Copyright 2003-2006 Jive Software.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.si.packet;
import java.util.Date;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jxmpp.util.XmppDateTime;
/**
* The process by which two entities initiate a stream.
*
* @author Alexander Wenckus
*/
public class StreamInitiation extends IQ {
public static final String ELEMENT = "si";
public static final String NAMESPACE = "http://jabber.org/protocol/si";
private String id;
private String mimeType;
private File file;
private Feature featureNegotiation;
public StreamInitiation() {
super(ELEMENT, NAMESPACE);
}
/**
* The "id" attribute is an opaque identifier. This attribute MUST be
* present on type='set', and MUST be a valid string. This SHOULD NOT be
* sent back on type='result', since the <iq/> "id" attribute provides the
* only context needed. This value is generated by the Sender, and the same
* value MUST be used throughout a session when talking to the Receiver.
*
* @param id The "id" attribute.
*/
public void setSessionID(final String id) {
this.id = id;
}
/**
* Uniquely identifies a stream initiation to the recipient.
*
* @return The "id" attribute.
* @see #setSessionID(String)
*/
public String getSessionID() {
return id;
}
/**
* The "mime-type" attribute identifies the MIME-type for the data across
* the stream. This attribute MUST be a valid MIME-type as registered with
* the Internet Assigned Numbers Authority (IANA) [3] (specifically, as
* listed at <http://www.iana.org/assignments/media-types>). During
* negotiation, this attribute SHOULD be present, and is otherwise not
* required. If not included during negotiation, its value is assumed to be
* "binary/octet-stream".
*
* @param mimeType The valid mime-type.
*/
public void setMimeType(final String mimeType) {
this.mimeType = mimeType;
}
/**
* Identifies the type of file that is desired to be transferred.
*
* @return The mime-type.
* @see #setMimeType(String)
*/
public String getMimeType() {
return mimeType;
}
/**
* Sets the file which contains the information pertaining to the file to be
* transferred.
*
* @param file The file identified by the stream initiator to be sent.
*/
public void setFile(final File file) {
this.file = file;
}
/**
* Returns the file containing the information about the request.
*
* @return Returns the file containing the information about the request.
*/
public File getFile() {
return file;
}
/**
* Sets the data form which contains the valid methods of stream negotiation
* and transfer.
*
* @param form The dataform containing the methods.
*/
public void setFeatureNegotiationForm(final DataForm form) {
this.featureNegotiation = new Feature(form);
}
/**
* Returns the data form which contains the valid methods of stream
* negotiation and transfer.
*
* @return Returns the data form which contains the valid methods of stream
* negotiation and transfer.
*/
public DataForm getFeatureNegotiationForm() {
return featureNegotiation.getData();
}
@Override
protected IQChildElementXmlStringBuilder getIQChildElementBuilder(IQChildElementXmlStringBuilder buf) {
switch (getType()) {
case set:
buf.optAttribute("id", getSessionID());
buf.optAttribute("mime-type", getMimeType());
buf.attribute("profile", NAMESPACE + "/profile/file-transfer");
buf.rightAngleBracket();
// Add the file section if there is one.
buf.optElement(file);
break;
case result:
buf.rightAngleBracket();
break;
default:
throw new IllegalArgumentException("IQ Type not understood");
}
if (featureNegotiation != null) {
buf.append(featureNegotiation.toXML());
}
return buf;
}
/**
* <ul>
* <li>size: The size, in bytes, of the data to be sent.</li>
* <li>name: The name of the file that the Sender wishes to send.</li>
* <li>date: The last modification time of the file. This is specified
* using the DateTime profile as described in Jabber Date and Time Profiles.</li>
* <li>hash: The MD5 sum of the file contents.</li>
* </ul>
* <p>
* <desc> is used to provide a sender-generated description of the
* file so the receiver can better understand what is being sent. It MUST
* NOT be sent in the result.
* </p>
* <p>
* When <range> is sent in the offer, it should have no attributes.
* This signifies that the sender can do ranged transfers. When a Stream
* Initiation result is sent with the <range> element, it uses these
* attributes:
* </p>
* <ul>
* <li>offset: Specifies the position, in bytes, to start transferring the
* file data from. This defaults to zero (0) if not specified.</li>
* <li>length - Specifies the number of bytes to retrieve starting at
* offset. This defaults to the length of the file from offset to the end.</li>
* </ul>
* Both attributes are OPTIONAL on the <range> element. Sending no
* attributes is synonymous with not sending the <range> element. When
* no <range> element is sent in the Stream Initiation result, the
* Sender MUST send the complete file starting at offset 0. More generally,
* data is sent over the stream byte for byte starting at the offset
* position for the length specified.
*
* @author Alexander Wenckus
*/
public static class File implements ExtensionElement {
private final String name;
private final long size;
private String hash;
private Date date;
private String desc;
private boolean isRanged;
/**
* Constructor providing the name of the file and its size.
*
* @param name The name of the file.
* @param size The size of the file in bytes.
*/
public File(final String name, final long size) {
if (name == null) {
throw new NullPointerException("name cannot be null");
}
this.name = name;
this.size = size;
}
/**
* Returns the file's name.
*
* @return Returns the file's name.
*/
public String getName() {
return name;
}
/**
* Returns the file's size.
*
* @return Returns the file's size.
*/
public long getSize() {
return size;
}
/**
* Sets the MD5 sum of the file's contents.
*
* @param hash The MD5 sum of the file's contents.
*/
public void setHash(final String hash) {
this.hash = hash;
}
/**
* Returns the MD5 sum of the file's contents.
*
* @return Returns the MD5 sum of the file's contents
*/
public String getHash() {
return hash;
}
/**
* Sets the date that the file was last modified.
*
* @param date The date that the file was last modified.
*/
public void setDate(Date date) {
this.date = date;
}
/**
* Returns the date that the file was last modified.
*
* @return Returns the date that the file was last modified.
*/
public Date getDate() {
return date;
}
/**
* Sets the description of the file.
*
* @param desc The description of the file so that the file receiver can
* know what file it is.
*/
public void setDesc(final String desc) {
this.desc = desc;
}
/**
* Returns the description of the file.
*
* @return Returns the description of the file.
*/
public String getDesc() {
return desc;
}
/**
* True if a range can be provided and false if it cannot.
*
* @param isRanged True if a range can be provided and false if it cannot.
*/
public void setRanged(final boolean isRanged) {
this.isRanged = isRanged;
}
/**
* Returns whether or not the initiator can support a range for the file
* transfer.
*
* @return Returns whether or not the initiator can support a range for
* the file transfer.
*/
public boolean isRanged() {
return isRanged;
}
@Override
public String getElementName() {
return "file";
}
@Override
public String getNamespace() {
return "http://jabber.org/protocol/si/profile/file-transfer";
}
@Override
public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
StringBuilder buffer = new StringBuilder();
buffer.append('<').append(getElementName()).append(" xmlns=\"")
.append(getNamespace()).append("\" ");
if (getName() != null) {
buffer.append("name=\"").append(StringUtils.escapeForXmlAttribute(getName())).append("\" ");
}
if (getSize() > 0) {
buffer.append("size=\"").append(getSize()).append("\" ");
}
if (getDate() != null) {
buffer.append("date=\"").append(XmppDateTime.formatXEP0082Date(date)).append("\" ");
}
if (getHash() != null) {
buffer.append("hash=\"").append(getHash()).append("\" ");
}
if ((desc != null && desc.length() > 0) || isRanged) {
buffer.append('>');
if (getDesc() != null && desc.length() > 0) {
buffer.append("<desc>").append(StringUtils.escapeForXmlText(getDesc())).append("</desc>");
}
if (isRanged()) {
buffer.append("<range/>");
}
buffer.append("</").append(getElementName()).append('>');
}
else {
buffer.append("/>");
}
return buffer.toString();
}
}
/**
* The feature negotiation portion of the StreamInitiation packet.
*
* @author Alexander Wenckus
*
*/
public static class Feature implements ExtensionElement {
private final DataForm data;
/**
* The dataform can be provided as part of the constructor.
*
* @param data The dataform.
*/
public Feature(final DataForm data) {
this.data = data;
}
/**
* Returns the dataform associated with the feature negotiation.
*
* @return Returns the dataform associated with the feature negotiation.
*/
public DataForm getData() {
return data;
}
@Override
public String getNamespace() {
return "http://jabber.org/protocol/feature-neg";
}
@Override
public String getElementName() {
return "feature";
}
@Override
public String toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
StringBuilder buf = new StringBuilder();
buf
.append("<feature xmlns=\"http://jabber.org/protocol/feature-neg\">");
buf.append(data.toXML());
buf.append("</feature>");
return buf.toString();
}
}
}