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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2291 b35dd754-fafc-0310-a699-88a17e54d16e
367 lines
14 KiB
Java
367 lines
14 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright (C) 2002-2003 Jive Software. All rights reserved.
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* ====================================================================
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* The Jive Software License (based on Apache Software License, Version 1.1)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by
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* Jive Software (http://www.jivesoftware.com)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Smack" and "Jive Software" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please
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* contact webmaster@jivesoftware.com.
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*
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* 5. Products derived from this software may not be called "Smack",
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* nor may "Smack" appear in their name, without prior written
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* permission of Jive Software.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*/
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package org.jivesoftware.smackx;
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import java.util.*;
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import org.jivesoftware.smack.packet.*;
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import org.jivesoftware.smackx.packet.DataForm;
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/**
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* Represents a Form for gathering data. The form could be of the following types:
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* <ul>
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* <li>form -> Indicates a form to fill out.</li>
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* <li>submit -> The form is filled out, and this is the data that is being returned from
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* the form.</li>
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* <li>cancel -> The form was cancelled. Tell the asker that piece of information.</li>
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* <li>result -> Data results being returned from a search, or some other query.</li>
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* </ul>
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*
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* Depending of the form's type different operations are available. For example, it's only possible
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* to set answers if the form is of type "submit".
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*
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* @author Gaston Dombiak
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*/
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public class Form {
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public static final String TYPE_FORM = "form";
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public static final String TYPE_SUBMIT = "submit";
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public static final String TYPE_CANCEL = "cancel";
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public static final String TYPE_RESULT = "result";
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private DataForm dataForm;
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/**
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* Returns a new ReportedData if the packet is used for gathering data and includes an
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* extension that matches the elementName and namespace "x","jabber:x:data".
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*
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* @param packet the packet used for gathering data.
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*/
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public static Form getFormFrom(Packet packet) {
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// Check if the packet includes the DataForm extension
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PacketExtension packetExtension = packet.getExtension("x","jabber:x:data");
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if (packetExtension != null) {
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// Check if the existing DataForm is not a result of a search
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DataForm dataForm = (DataForm) packetExtension;
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if (dataForm.getReportedData() == null)
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return new Form(dataForm);
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}
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// Otherwise return null
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return null;
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}
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/**
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* Creates a new Form that will wrap an existing DataForm. The wrapped DataForm must be
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* used for gathering data.
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*
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* @param dataForm the data form used for gathering data.
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*/
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private Form(DataForm dataForm) {
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this.dataForm = dataForm;
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}
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/**
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* Creates a new Form of a given type from scratch.<p>
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*
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* Possible form types are:
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* <ul>
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* <li>form -> Indicates a form to fill out.</li>
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* <li>submit -> The form is filled out, and this is the data that is being returned from
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* the form.</li>
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* <li>cancel -> The form was cancelled. Tell the asker that piece of information.</li>
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* <li>result -> Data results being returned from a search, or some other query.</li>
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* </ul>
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*
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* @param type the form's type (e.g. form, submit,cancel,result).
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*/
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public Form(String type) {
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this.dataForm = new DataForm(type);
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}
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/**
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* Adds a new field to complete as part of the form.
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*
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* @param field the field to complete.
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*/
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public void addField(FormField field) {
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dataForm.addField(field);
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}
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/**
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* Sets a new answer as part of a form's field. The field whose variable matches the requested
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* variable will be completed with the specified value. If no field could be found for
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* the specified variable then an exception will be raised.
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*
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* @param variable the variable that was completed.
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* @param value the value that was answered.
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* @throws IllegalStateException if the form is not of type "submit".
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* @throws IllegalArgumentException if the form does not include the specified variable.
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*/
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public void setAnswer(String variable, String value) {
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if (!isSubmitType()) {
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throw new IllegalStateException("Cannot set an answer if the form is not of type " +
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"\"submit\"");
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}
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FormField field = getField(variable);
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if (field != null) {
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field.resetValues();
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field.addValue(value);
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}
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else {
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throw new IllegalArgumentException("Couldn't find a field for the specified variable.");
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}
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}
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/**
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* Sets new answers as part of a form's field. The field whose variable matches the requested
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* variable will be completed with the specified values. If no field could be found for
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* the specified variable then an exception will be raised.
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*
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* @param variable the variable that was completed.
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* @param values the values that were answered.
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* @throws IllegalStateException if the form is not of type "submit".
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* @throws IllegalArgumentException if the form does not include the specified variable.
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*/
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public void setAnswer(String variable, List values) {
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if (!isSubmitType()) {
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throw new IllegalStateException("Cannot set an answer if the form is not of type " +
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"\"submit\"");
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}
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FormField field = getField(variable);
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if (field != null) {
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field.resetValues();
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field.addValues(values);
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}
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else {
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throw new IllegalArgumentException("Couldn't find a field for the specified variable.");
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}
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}
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/**
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* Returns an Iterator for the fields that are part of the form.
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*
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* @return an Iterator for the fields that are part of the form.
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*/
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public Iterator getFields() {
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return dataForm.getFields();
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}
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/**
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* Returns the field of the form whose variable matches the specified variable.
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* The fields of type FIXED will never be returned since they do not specify a
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* variable.
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*
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* @param variable the variable to look for in the form fields.
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* @return the field of the form whose variable matches the specified variable.
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*/
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public FormField getField(String variable) {
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if (variable == null || variable.equals("")) {
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throw new IllegalArgumentException("Variable must not be null or blank.");
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}
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// Look for the field whose variable matches the requested variable
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FormField field;
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for (Iterator it=getFields();it.hasNext();) {
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field = (FormField)it.next();
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if (variable.equals(field.getVariable())) {
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return field;
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}
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}
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return null;
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}
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/**
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* Returns the instructions that explain how to fill out the form and what the form is about.
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*
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* @return instructions that explain how to fill out the form.
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*/
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public String getInstructions() {
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return dataForm.getInstructions();
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}
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/**
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* Returns the description of the data. It is similar to the title on a web page or an X
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* window. You can put a <title/> on either a form to fill out, or a set of data results.
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*
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* @return description of the data.
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*/
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public String getTitle() {
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return dataForm.getTitle();
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}
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/**
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* Returns the meaning of the data within the context. The data could be part of a form
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* to fill out, a form submission or data results.<p>
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*
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* Possible form types are:
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* <ul>
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* <li>form -> Indicates a form to fill out.</li>
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* <li>submit -> The form is filled out, and this is the data that is being returned from
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* the form.</li>
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* <li>cancel -> The form was cancelled. Tell the asker that piece of information.</li>
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* <li>result -> Data results being returned from a search, or some other query.</li>
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* </ul>
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*
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* @return the form's type.
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*/
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public String getType() {
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return dataForm.getType();
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}
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/**
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* Sets instructions that explain how to fill out the form and what the form is about.
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*
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* @param instructions instructions that explain how to fill out the form.
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*/
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public void setInstructions(String instructions) {
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dataForm.setInstructions(instructions);
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}
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/**
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* Sets the description of the data. It is similar to the title on a web page or an X window.
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* You can put a <title/> on either a form to fill out, or a set of data results.
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*
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* @param title description of the data.
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*/
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public void setTitle(String title) {
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dataForm.setTitle(title);
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}
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/**
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* Returns a DataForm that serves to send this Form to the server. If the form is of type
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* submit, it may contain fields with no value. These fields will be remove since they only
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* exist to assist the user while editing/completing the form in a UI.
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*
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* @return the wrapped DataForm.
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*/
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DataForm getDataFormToSend() {
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if (isSubmitType()) {
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// Answer a new form based on the values of this form
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DataForm dataFormToSend = new DataForm(getType());
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dataFormToSend.setInstructions(getInstructions());
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dataFormToSend.setTitle(getTitle());
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// Remove all the fields that have no answer
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for(Iterator it=getFields();it.hasNext();) {
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FormField field = (FormField)it.next();
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if (field.getValues().hasNext()) {
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dataFormToSend.addField(field);
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}
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}
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return dataFormToSend;
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}
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return dataForm;
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}
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/**
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* Returns true if the form is a form to fill out.
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*
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* @return if the form is a form to fill out.
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*/
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private boolean isFormType() {
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return TYPE_FORM.equals(dataForm.getType());
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}
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/**
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* Returns true if the form is a form to submit.
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*
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* @return if the form is a form to submit.
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*/
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private boolean isSubmitType() {
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return TYPE_SUBMIT.equals(dataForm.getType());
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}
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/**
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* Returns a new Form to submit the completed values. The new Form will include all the fields
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* of the original form except for the fields of type FIXED. Only the HIDDEN fields will
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* include the same value of the original form. The other fields of the new form MUST be
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* completed. If a field remains with no answer when sending the completed form, then it won't
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* be included as part of the completed form.<p>
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*
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* The reason why the fields with variables are included in the new form is to provide a model
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* for binding with any UI. This means that the UIs will use the original form (of type
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* "form") to learn how to render the form, but the UIs will bind the fields to the form of
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* type submit.
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*
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* @return a Form to submit the completed values.
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*/
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public Form createAnswerForm() {
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if (!isFormType()) {
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throw new IllegalStateException("Only forms of type \"form\" could be answered");
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}
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// Create a new Form
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Form form = new Form(TYPE_SUBMIT);
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for (Iterator fields=getFields(); fields.hasNext();) {
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FormField field = (FormField)fields.next();
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// Add to the new form any type of field that includes a variable.
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// Note: The fields of type FIXED are the only ones that don't specify a variable
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if (field.getVariable() != null) {
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form.addField(new FormField(field.getVariable()));
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// Set the answer ONLY to the hidden fields
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if (FormField.TYPE_HIDDEN.equals(field.getType())) {
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// Since a hidden field could have many values we need to collect them
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// in a list
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List values = new ArrayList();
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for (Iterator it=field.getValues();it.hasNext();) {
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values.add((String)it.next());
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}
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form.setAnswer(field.getVariable(), values);
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}
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}
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}
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return form;
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}
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}
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