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1 package com.genimen.djeneric.tools.generator.core.nodes;
2
3 import com.genimen.djeneric.repository.DjList;
4 import com.genimen.djeneric.repository.DjObject;
5 import com.genimen.djeneric.repository.exceptions.ObjectNotDefinedException;
6 import com.genimen.djeneric.tools.generator.core.DjentelParserEngine;
7 import com.genimen.djeneric.tools.generator.core.ParseException;
8 import com.genimen.djeneric.tools.generator.core.SimpleNode;
9 import com.genimen.djeneric.tools.generator.core.util.ContextObject;
10 import com.genimen.djeneric.tools.generator.core.util.ParseContext;
11
12 public class SetNode extends SimpleNode
13 {
14 String  _setName = "";
15
16 public SetNode(int i)
17 {
18 super(i);
19 }
20
21 public SetNode(DjentelParserEngine p, int i)
22 {
23 super(p, i);
24 }
25
26 public String getName()
27 {
28 return "set";
29 }
30
31 public String toString()
32 {
33 return "";
34 }
35
36 public String evaluate(ParseContext context) throws ParseException
37 {
38 ValueExpression val = (ValueExpression) getChild(0);
39 Object o = val.getValue(context);
40 if (!(o instanceof DjList)) throw new ParseException("Not a set expression", beginLine, beginColumn);
41 DjList lst = (DjList) o;
42
43 FilterNode filter = null;
44 OrderByNode orderBy = null;
45
46 for (int i = 1; i < getChildCount(); i++)
47 {
48 if (getChild(i) instanceof FilterNode) filter = (FilterNode) getChild(i);
49 if (getChild(i) instanceof OrderByNode) orderBy = (OrderByNode) getChild(i);
50 }
51
52 lst = processFilter(lst, context, filter);
53 processOrderBy(lst, orderBy);
54
55 context.getObjectStack().push(getSetName(), lst);
56 return "";
57 }
58
59 public String getSetName()
60 {
61 return _setName;
62 }
63
64 public void setSetName(String n)
65 {
66 _setName = n;
67 }
68
69 public DjList processFilter(DjList lst, ParseContext context, FilterNode filter) throws ParseException
70 {
71 if (filter != null)
73 {
74 DjList filteredSet = new DjList();
75 context.mark();
76 ContextObject co = new ContextObject(getSetName(), null);
77 context.pushObject(co);
78 for (int i = 0; i < lst.size(); i++)
79 {
80 co.setObject(lst.getDjenericObjectAt(i));
81 if (filter.isTrue(context)) filteredSet.add(lst.getDjenericObjectAt(i));
82 }
83 lst = filteredSet;
84
85 context.releaseToMark();
86 }
87 return lst;
88 }
89
90 public void processOrderBy(DjList lst, OrderByNode orderBy) throws ParseException
91 {
92 if (orderBy != null)
93 {
94 try
95 {
96 String [] props = orderBy.getProperties();
97 int[] idxs = new int[props.length];
98 DjObject dob = lst.getDjenericObjectAt(0);
99
100 for (int i = 0; i < props.length; i++)
101 {
102 idxs[i] = dob.getPropertyIndex(props[i]);
103 }
104 lst.sort(idxs);
105 }
106 catch (ObjectNotDefinedException onde)
107 {
108 throw new ParseException("Order by: " + onde.getMessage(), orderBy.beginLine, orderBy.beginColumn);
109 }
110 }
111 }
112
113 } |
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