Transitions


1   /* Transitions.java
2    *
3    * Authors:
4    * Stefanovic Nenad  chupo@iis.ns.ac.yu
5    * Bojanic Sasa      sasaboy@neobee.net
6    * Puskas Vladimir   vpuskas@eunet.yu
7    * Pilipovic Goran   zboniek@uns.ac.yu
8    *
9    */
10  
11  package org.enhydra.jawe.xml.elements;
12  
13  import org.enhydra.jawe.xml.*;
14  import org.enhydra.jawe.xml.panels.*;
15  
16  import java.util.*;
17  
18  /**
19  * Represents a WfMC DTD element that has the similar name.
20  * This class is a collection of class <b>Transition</b> instances.
21  *
22  * @see XML
23  */
24  public class Transitions extends XMLCollection {
25     /**
26     * Creates a new instance of the class.
27     *
28     * @param wpOrAs The workflow process or activiy set that holds transitions,
29     * and which member is this class instance.
30     */
31     public Transitions (XMLComplexElement wpOrAs) {
32        super(wpOrAs);
33     }
34  
35     /**
36     * Generates a new element of the class which instances
37     * are members of collection of this class.
38     *
39     * return The generated instance of class that makes collection.
40     */
41     public XMLElement generateNewElement() {
42        Transition t=new Transition(this);
43        t.setRequired(true);
44        return t;
45     }
46  
47  
48     /**
49     * Returns a set of transitions which source or target is the
50     * graph object with specified 'Id' attribute.
51     *
52     * @param ID ID of source or target graph object for
53     *           transition, depending of second attribute.
54     * @param st These are possible values:<p>
55     *              <ul>
56     *              <li> -1 - specified ID is source for transitions
57     *              <li>  0 - specified ID is source and target for transitions
58     *              <li>  1 - specified ID is target for transitions
59     *              </ul>
60     * @return The set of transitions for which the graph object with
61     *         specified ID is source or target, depending on second
62     *         parameter of this method.
63     */
64     public Set getTransitions (String   ID,int st) {
65        Set trans=new HashSet();
66        Transition t;
67        Iterator it=refCollectionElements.iterator();
68        while (it.hasNext()) {
69           t=(Transition)it.next();
70           if (st<=0) {
71              //if (t.get("From").toValue().toString().equals(ID)) {
72              try {
73                 if (t.getFrom().get("Id").toString().equals(ID)) {
74                    trans.add(t);
75                 }
76              } catch (Exception   ex) {}
77           }
78           if (st>=0) {
79              //if (t.get("To").toValue().toString().equals(ID)) {
80              try {
81                 if (t.getTo().get("Id").toString().equals(ID)) {
82                    trans.add(t);
83                 }
84              } catch (Exception   ex) {}
85           }
86        }
87        return trans;
88     }
89  
90     /**
91     * Returns the transition object with specified ID.
92     *
93     * @param ID ID of wanted transition
94     * @return The transitions that have specified ID if exists,
95     *         <tt>null</tt> otherwise.
96     */
97     public Transition getTransition (String   ID) {
98        return (Transition)super.getCollectionElement(ID);
99     }
100 
101    /**
102    * Returns <tt>true</tt> if specified data field or formal parameter is
103    * used in transition condition expression of any transition.
104    */
105    protected boolean canRemoveDataFieldOrFormalParameter (XMLCollectionElement toRemove) {
106       String   IDToCheck=toRemove.getID();
107       Transition t;
108       Condition c;
109       Xpression x;
110       String   tcx;
111       int foundAt;
112       char prev, next;
113       boolean prevOK, nextOK;
114 
115       Iterator it=refCollectionElements.iterator();
116       while (it.hasNext()) {
117          t=(Transition)it.next();
118          c=(Condition)t.get("Condition");
119          x=(Xpression)c.get("Xpression");
120          tcx=x.toString();
121          foundAt=tcx.indexOf(IDToCheck);
122          // if given ID is found within expression string
123          // check if ID string is part of some other ID name
124          if (foundAt!=-1) {
125             // check if char previous to the position of found ID is OK
126             if (foundAt==0) {
127                prevOK=true;
128             } else {
129                prev=tcx.charAt(foundAt-1);
130                prevOK=!XMLCollection.isIdValid(String.valueOf(prev));
131             }
132 
133             // check if char after found ID string is OK
134             if (foundAt+IDToCheck.length()==tcx.length()) {
135                nextOK=true;
136             } else {
137                next=tcx.charAt(foundAt+IDToCheck.length());
138                nextOK=!XMLCollection.isIdValid(String.valueOf(next));
139             }
140 
141             // if this is really the ID, return that it can't be removed
142             if (prevOK && nextOK) {
143                return false;
144             }
145          }
146       }
147       return true;
148    }
149 
150    public int[] getInvisibleTableFieldOrdinals () {
151       int[] itfo=new int[4];
152       itfo[0]=2;
153       itfo[1]=3;
154       itfo[2]=5;
155       itfo[3]=6;
156       return itfo;
157    }
158 
159    /**
160    * Called by owner object after importing of XML file to do neccessary
161    * things on transitions after importing of XML.
162    */
163    protected void afterImporting () {
164       Iterator it=refCollectionElements.iterator();
165       while (it.hasNext()) {
166          Transition t=(Transition)it.next();
167          t.afterImporting();
168       }
169    }
170 
171    // First, the controlled panel must be created, and then the control panel
172    public XMLPanel getPanel () {
173       isReadOnly=true;
174       controlledPanel=new XMLTablePanel(this,"",false,false);
175       controlPanel=new XMLTableControlPanel(this,"",true,false);
176       return new XMLGroupPanel(this,new XMLPanel[]{
177          controlledPanel,controlPanel},toLabel(),XMLPanel.BOX_LAYOUT,
178          false,true);
179    }
180 
181    public Object   toValue () {
182       return String.valueOf(refCollectionElements.size());
183    }
184 
185     public WorkflowProcess getWorkflowProcess () {
186       Object   own=getOwner();
187       if (own instanceof ActivitySet) {
188          return ((ActivitySet)own).getOwnerProcess();
189       } else {
190          return (WorkflowProcess)own;
191       }
192     }
193 
194    /**
195     * Overrides parent method to handle the case when the activities
196     * from WorkflowProcess collection are copied to ActivitySet collection
197     * and vice-versa.
198     */
199    public void refreshCollection (Set elementsToAddOrRemove,boolean append) {
200       if (append) {
201          for (Iterator it=elementsToAddOrRemove.iterator(); it.hasNext();) {
202             Transition t=(Transition)it.next();
203             // generate new ID because of possible different id-prefixes
204             if (t.getCollection() != this){
205                decrementID();
206                t.get("Id").setValue(this.generateID());
207             }
208             t.setCollection(this);
209             refCollectionElements.add(t);
210          }
211       } else {
212          refCollectionElements.removeAll(elementsToAddOrRemove);
213       }
214    }
215 
216 
217    /**
218     * Overrides parent method to be accessible within WorkflowManager.
219     */
220    public void decrementID () {
221       getWorkflowProcess().decrementTransitionId();
222    }
223 
224    public long getCurrentID () {
225       return getWorkflowProcess().getCurrentTransitionId();
226    }
227 
228    public String   generateID () {
229       if (IDPrefix==null) IDPrefix="";
230       String   ID;
231       do {
232          ID=IDPrefix+new Long  (getWorkflowProcess().getNextTransitionId()).toString();
233       } while (getWorkflowProcess().getTransition(ID)!=null);
234       return ID;
235    }
236 
237    protected void resetID () {
238       getWorkflowProcess().resetTransitionId();
239    }
240 
241    protected void updateID (String   someID) {
242       // try to get ID as if it is ours
243       try {
244          long val;
245          if (someID.startsWith(IDPrefix)) {
246             String   ID=someID.substring(IDPrefix.length(),someID.length());
247             val=Long.parseLong(ID);
248             if (val>getWorkflowProcess().getCurrentTransitionId()) {
249                getWorkflowProcess().setCurrentTransitionId(val);
250             }
251          }
252       // then try to update someID as if it is only number
253       } catch (Exception   ex) {
254          return;
255       }
256    }
257 
258 }
259
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