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1
22
23 package org.xquark.mediator.DOMUtils;
24
25 import java.util.ArrayList  ;
26
27 import org.xquark.mediator.algebra.AlgFLWR;
28 import org.xquark.mediator.algebra.Algebra;
29 import org.xquark.schema.SchemaManager;
30 import org.xquark.xpath.datamodel.TypedNode;
31 import org.xquark.xquery.parser.*;
32 import org.xquark.xquery.typing.*;
33
34
35 public class FillExprWithTupleVisitor extends DefaultParserVisitor {
36 private static final String RCSRevision = "$Revision: 1.10 $";
40 private static final String RCSName = "$Name: $";
41 private ArrayList tuples = null;
46 private XQueryExpression resultExpr = null;
47 private SchemaManager schemamanager = null;
48 private TypeVisitor typevisitor = null;
49
55 public FillExprWithTupleVisitor(SchemaManager schemamanager, TypeVisitor typevisitor, Tuple tuple) {
56 this.tuples = new ArrayList (1);
57 tuples.add(tuple);
58 this.schemamanager = schemamanager;
59 this.typevisitor = typevisitor;
60 }
61
62 public FillExprWithTupleVisitor(SchemaManager schemamanager, TypeVisitor typevisitor, ArrayList tuples) {
63 this.tuples = tuples;
64 this.schemamanager = schemamanager;
65 this.typevisitor = typevisitor;
66 }
67
68 public XQueryExpression getResultExpr() { return resultExpr; }
69
70
75 public void visit(Algebra arg) throws XQueryException {
76 arg.getExpression().accept(this);
77 if (resultExpr != null)
78 arg.setExpression(resultExpr);
79 ArrayList children = arg.getChildren();
80 if (children != null)
81 for (int i = 0; i < children.size(); i++)
82 visit((Algebra) children.get(i));
83 if (arg.isQDB()) {
84 AlgFLWR tmpdepmem = (AlgFLWR) arg;
85 if (tmpdepmem.getDependencyList() != null)
86 for (int i = 0; i < tmpdepmem.getDependencyList().size(); i++)
87 visit((AlgFLWR) tmpdepmem.getDependencyList().get(i));
88 }
89 arg.getVarsDependingOn().clear();
90 resultExpr = null;
91 }
92
93 public void visit(XQueryExpression arg) throws XQueryException {
97 resultExpr = null;
98 }
99
100 public void visit(FunctionCall arg) throws XQueryException {
101 ArrayList arguments = arg.getArguments();
102 if (arguments != null) {
103 for (int i = 0; i < arguments.size(); i++) {
104 XQueryExpression argi = (XQueryExpression) arguments.get(i);
105 argi.accept(this);
106 if (resultExpr != null)
107 arguments.set(i, resultExpr);
108 }
109 }
110 resultExpr = null;
111 }
112
113 public void visit(FLWRExpression arg) throws XQueryException {
114 for (int i = 0; i < arg.getVariables().size(); i++) {
115 Variable vari = (Variable) arg.getVariables().get(i);
116 vari.getExpression().accept(this);
117 if (resultExpr != null)
118 vari.setExpression(resultExpr,false);
119 }
120 if (arg.getWhereClause() != null) {
121 arg.getWhereClause().accept(this);
122 if (resultExpr != null)
123 arg.setWhereClause(resultExpr);
124 }
125 resultExpr = null;
129 }
130
131 public void visit(QuantifiedExpression arg) throws XQueryException {
132 for (int i = 0; i < arg.getVariables().size(); i++) {
133 Variable vari = (Variable) arg.getVariables().get(i);
134 vari.getExpression().accept(this);
135 if (resultExpr != null)
136 vari.setExpression(resultExpr,false);
137 }
138 arg.getConstraintExpresson().accept(this);
139 if (resultExpr != null)
140 arg.setConstraintExpresson(resultExpr);
141 resultExpr = null;
142 }
143
144 public void visit(XQueryBinaryOperatorExpression arg) throws XQueryException {
145 arg.getExpression1().accept(this);
146 if (resultExpr != null)
147 arg.setExpression1(resultExpr);
148 arg.getExpression2().accept(this);
149 if (resultExpr != null)
150 arg.setExpression2(resultExpr);
151 resultExpr = null;
152 }
153
154 public void visit(LocatedExpression arg) throws XQueryException {
155 resultExpr = null;
156 XQueryExpression step0expr = arg.getExpression();
157 if (step0expr instanceof Variable) {
158
159 EvaluationVisitor visitor = null;
160 for (int j = 0; j < tuples.size(); j++) {
161
162 if (j == 0)
163 visitor = new EvaluationVisitor(this.schemamanager, (Tuple) tuples.get(j));
164 else
165 visitor.reset((Tuple) tuples.get(j));
166
167 arg.accept(visitor);
168 ArrayList tmplist = visitor.getResNodes();
169 if (tmplist != null && !tmplist.isEmpty()) {
170 if (tmplist.size() == 1) {
171 TypedNode tmpnode = (TypedNode) tmplist.get(0);
172 Object strvalue = tmpnode.getTypedValue();
173 if (strvalue == null) {
174 strvalue = DOMUtils.getTextLeaf(tmpnode);
175 }
176 if (strvalue == null)
177 throw new XQueryException("Unexpected value encountered while replacing variable");
178 resultExpr = DOMUtils.getXQueryExpression(strvalue);
179 if (resultExpr == null)
180 throw new XQueryException("Unexpected type encountered while replacing variable");
181 } else {
182 ArrayList seqlist = new ArrayList ();
183 for (int i = 0; i < tmplist.size(); i++) {
184 TypedNode tmpnode = (TypedNode) tmplist.get(i);
185 Object strvalue = tmpnode.getTypedValue();
186 if (strvalue == null) {
187 strvalue = DOMUtils.getTextLeaf(tmpnode);
188 }
189 if (strvalue == null)
190 throw new XQueryException("Unexpected value encountered while replacing variable");
191 XQueryExpression tmpExpr = DOMUtils.getXQueryExpression(strvalue);
192 if (tmpExpr == null)
193 throw new XQueryException("Unexpected type encountered while replacing variable");
194 seqlist.add(tmpExpr);
195 }
196 resultExpr = new XQueryExpressionSequence(seqlist, arg.getParentModule());
197 resultExpr.setParenthesis(true);
198 }
199 break;
200 }
201 }
202 }
203 }
204
205 public void visit(Variable arg) throws XQueryException {
206 for (int j = 0; j < tuples.size(); j++) {
207 ArrayList tmplist = ((Tuple) tuples.get(j)).getPath(arg.getStringValue());
208 if (tmplist != null) {
209 if (tmplist.size() == 1) {
210 TypedNode tmpnode = (TypedNode) tmplist.get(0);
211
212 Object strvalue = tmpnode.getTypedValue();
213 if (strvalue == null) {
214 strvalue = DOMUtils.getTextLeaf(tmpnode);
215 }
216 if (strvalue == null)
217 throw new XQueryException("Unexpected value encountered while replacing variable");
218 resultExpr = DOMUtils.getXQueryExpression(strvalue);
219
225 if (resultExpr == null)
226 throw new XQueryException("Unexpected type encountered while replacing variable");
227 } else {
228 throw new XQueryException("Replacing variable by more than one value -> not implemented yet");
229 }
230 break;
231 }
232 }
233 }
234
235 }
236 |
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