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22
23 package org.xquark.extractor.algebra;
24
25 import java.util.*;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29
30
33 public final class AlgebraTools {
34
35 private static final String  RCSRevision = "$Revision: 1.13 $";
36 private static final String RCSName = "$Name: $";
37
38 private static Log log = LogFactory.getLog(AlgebraTools.class);
39
40 public static List clone(Collection collection) throws CloneNotSupportedException {
41 return cloneCopy(collection, new ArrayList());
42 }
43
44 public static List cloneCopy(Collection source, List dest) throws CloneNotSupportedException {
45 Object obj = null;
46 Iterator it = source.iterator();
47 while (it.hasNext()) {
48 obj = it.next();
49
50 if (obj instanceof Expression) {
51 dest.add(((Expression) obj).clone());
52 } else if (obj instanceof MapItem) {
53 dest.add(((MapItem) obj).clone());
54 } else if (obj instanceof SqlType) {
55 dest.add(((SqlType) obj).clone());
56 } else if (obj instanceof String ) {
57 dest.add(obj);
58 } else if (null == obj) {
59 dest.add(null);
60 } else {
61 log.error("object to be cloned is not Expression" + obj);
62 throw new CloneNotSupportedException ("Error in cloning ArrayList" + obj);
63 }
64 }
65 return dest;
66 }
67
68 public static List cloneCopyExpressionsWithoutDoubles(Collection source, List dest) throws CloneNotSupportedException {
69 Expression expr = null;
70 Iterator it = source.iterator();
71 while (it.hasNext()) {
72 expr = (Expression) it.next();
73
74 if (!UnOpProject.hasNameConflict(expr, dest))
75 dest.add(((Expression) expr).clone());
76 }
77
78 return dest;
79 }
80
81 public static List clone(List list, Map clonedExprs) throws CloneNotSupportedException {
82 if (null == list) {
83 return null;
84 }
85 List retVal = new ArrayList();
86
87 for (int i = 0; i < list.size(); i++) {
88 Object obj = list.get(i);
89
90 if (obj instanceof Expression) {
91 retVal.add(((Expression) obj).clone(clonedExprs));
92 } else if (obj instanceof MapItem) {
93 retVal.add(((MapItem) obj).clone());
94 } else if (obj instanceof SqlType) {
95 retVal.add(((SqlType) obj).clone());
96 } else if (obj instanceof String ) {
97 retVal.add(new String ((String ) obj));
98 } else {
99 log.error("object to be cloned is not Expression" + obj);
100 throw new CloneNotSupportedException ("Error in cloning ArrayList" + obj);
101 }
102 }
103
104 return retVal;
105 }
106
107
108 public static boolean areExprListEquivalent(List exprList1, List exprList2) {
109 int len1 = exprList1.size(), len2 = exprList2.size();
110 boolean ret = (len1 == len2), found;
111 LinkedList optList2 = new LinkedList(exprList2);
112 Expression expr;
115 ListIterator it;
116
117
118 for (int i = 0; ret && i < len1; i++) {
119 expr = (Expression) exprList1.get(i);
120 it = optList2.listIterator();
121 found = false;
122
123 while (it.hasNext()) {
124 if (expr.deepEquals(it.next())) {
125 it.remove();
126 found = true;
127 }
128 }
129 ret &= found;
130 }
131 return ret;
132 }
133
134 public static void applyVisitorOnCollection(AlgebraVisitor visitor, List exprList) {
135 applyVisitorOnCollection(visitor, exprList, true);
136 }
137
138 public static void applyVisitorOnCollection(AlgebraVisitor visitor, List exprList, boolean preserve) {
139 if (exprList != null) {
140 ListIterator it = exprList.listIterator();
141 while (it.hasNext()) {
142 ((Expression) it.next()).accept(visitor);
143 if (!preserve)
144 it.set(visitor.getVisitedExpression());
145 }
146 }
147 }
148 }
149 |
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