hunt.sql.ast.expr.SQLNCharExpr source code

1 /*
2  * Copyright 2015-2018 HuntLabs.cn
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 module hunt.sql.ast.expr.SQLNCharExpr;
17 
18 import hunt.sql.ast.SQLDataType;
19 import hunt.sql.ast.statement.SQLCharacterDataType;
20 import hunt.sql.visitor.SQLASTVisitor;
21 import hunt.sql.ast.expr.SQLTextLiteralExpr;
22 import hunt.collection;
23 import std.array;
24 import hunt.String;
25 import hunt.util.StringBuilder;
26 
27 import std.concurrency : initOnce;
28 
29 public class SQLNCharExpr : SQLTextLiteralExpr {
30     
31     static SQLDataType defaultDataType() {
32         __gshared SQLDataType inst;
33         return initOnce!inst(new SQLCharacterDataType("nvarchar"));
34     }
35 
36     public this(){
37 
38     }
39 
40     public this(String text){
41         super(text);
42     }
43 
44     public this(string text){
45         super(new String(text));
46     }
47 
48     override public void output(StringBuilder buf) {
49         if ((this.text is null) || (this.text.value.length == 0)) {
50             buf.append("NULL");
51             return;
52         }
53 
54         buf.append("N'");
55         buf.append(this.text.value().replace("'", "''"));
56         buf.append("'");
57     }
58 
59     override  protected void accept0(SQLASTVisitor visitor) {
60         visitor.visit(this);
61         visitor.endVisit(this);
62     }
63 
64     override public SQLNCharExpr clone() {
65         return new SQLNCharExpr(text);
66     }
67 
68     override public SQLDataType computeDataType() {
69         return defaultDataType;
70     }
71 }