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16 package org.outerj.daisy.query.model;
17
18 import org.outerj.daisy.query.QueryContext;
19 import org.outerj.daisy.repository.query.QueryException;
20 import org.outerj.daisy.repository.query.EvaluationContext;
21
22 import java.util.List  ;
23 import java.util.ArrayList ;
24 import java.util.Iterator ;
25 import java.sql.PreparedStatement ;
26 import java.sql.SQLException ;
27
28 public abstract class AbstractFunction implements Function {
29 protected List params = new ArrayList (4);
30 private int line = -1;
31 private int column = -1;
32
33 public void setLocation(int line, int column) {
34 this.line = line;
35 this.column = column;
36 }
37
38 public String getLocation() {
39 if (line == -1 && column == -1)
40 return "(location unknown)";
41 else
42 return "line " + line + ", column " + column;
43 }
44
45 public int getLine() {
46 return line;
47 }
48
49 public int getColumn() {
50 return column;
51 }
52
53 public void addParam(ValueExpr param) {
54 params.add(param);
55 }
56
57 protected ValueExpr getParam(int index) {
58 return (ValueExpr)params.get(index);
59 }
60
61 public void prepare(QueryContext context) throws QueryException {
62 if (params.size() == 0)
63 return;
64 Iterator paramsIt = params.iterator();
65 while (paramsIt.hasNext()) {
66 ((ValueExpr)paramsIt.next()).prepare(context);
67 }
68 }
69
70 public String getSqlPreConditions(SqlGenerationContext context) throws QueryException {
71 if (params.size() == 0)
72 return null;
73 StringBuffer preConds = new StringBuffer ();
74 Iterator paramsIt = params.iterator();
75 while (paramsIt.hasNext()) {
76 ValueExpr param = (ValueExpr)paramsIt.next();
77 String preCond = param.getSqlPreConditions(context);
78 if (preCond != null) {
79 if (preConds.length() > 0)
80 preConds.append(" and ");
81 preConds.append(preCond);
82 }
83 }
84 return preConds.length() > 0 ? preConds.toString() : null;
85 }
86
87 public int bindPreConditions(PreparedStatement stmt, int bindPos) throws SQLException , QueryException {
88 if (params.size() == 0)
89 return bindPos;
90 Iterator paramsIt = params.iterator();
91 while (paramsIt.hasNext()) {
92 ValueExpr param = (ValueExpr)paramsIt.next();
93 bindPos = param.bindPreConditions(stmt, bindPos);
94 }
95 return bindPos;
96 }
97
98 public boolean isSymbolicIdentifier() {
99 return false;
100 }
101
102 public boolean isMultiValue() {
103 return false;
104 }
105
106 public boolean isOutputOnly() {
107 Iterator paramsIt = params.iterator();
108 while (paramsIt.hasNext()) {
109 ValueExpr param = (ValueExpr)paramsIt.next();
110 if (param.isOutputOnly())
111 return true;
112 }
113 return false;
114 }
115
116 public AclConditionViolation isAclAllowed() {
117 Iterator paramsIt = params.iterator();
118 while (paramsIt.hasNext()) {
119 ValueExpr param = (ValueExpr)paramsIt.next();
120 AclConditionViolation violation = param.isAclAllowed();
121 if (violation != null)
122 return violation;
123 }
124 return null;
125 }
126
127 public Object translateSymbolic(ValueExpr valueExpr, EvaluationContext evaluationContext) throws QueryException {
128 throw new QueryException("translateSymbolic should not be called if isSymbolic returns false");
129 }
130
131 public void generateSqlValueExpr(StringBuffer sql, SqlGenerationContext context) throws QueryException {
132 Iterator paramsIt = params.iterator();
133 boolean first = true;
134 while (paramsIt.hasNext()) {
135 if (first)
136 first = false;
137 else
138 sql.append(", ");
139 ValueExpr param = (ValueExpr)paramsIt.next();
140 param.generateSqlValueExpr(sql, context);
141 }
142 }
143
144 public int bindValueExpr(PreparedStatement stmt, int bindPos, QValueType valueType, EvaluationContext evaluationContext) throws SQLException , QueryException {
145 Iterator paramsIt = params.iterator();
146 while (paramsIt.hasNext()) {
147 ValueExpr param = (ValueExpr)paramsIt.next();
148 bindPos = param.bindValueExpr(stmt, bindPos, valueType, evaluationContext);
149 }
150 return bindPos;
151 }
152
153 public String getExpression() {
154 StringBuffer expression = new StringBuffer ();
155 expression.append(getFunctionName()).append("(");
156 boolean first = true;
157 Iterator paramsIt = params.iterator();
158 while (paramsIt.hasNext()) {
159 if (first)
160 first = false;
161 else
162 expression.append(", ");
163 ValueExpr valueExpr = (ValueExpr)paramsIt.next();
164 expression.append(valueExpr.getExpression());
165 }
166 expression.append(")");
167 return expression.toString();
168 }
169
170 public boolean canTestAppliesTo() {
171 Iterator paramsIt = params.iterator();
172 while (paramsIt.hasNext()) {
173 ValueExpr param = (ValueExpr)paramsIt.next();
174 if (!param.canTestAppliesTo())
175 return false;
176 }
177 return true;
178 }
179 }
180 |
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