hunt.sql.ast.expr.SQLCharExpr 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.SQLCharExpr;
17 
18 import hunt.sql.SQLUtils;
19 import hunt.sql.ast.SQLDataType;
20 import hunt.sql.ast.SQLObject;
21 import hunt.sql.ast.statement.SQLCharacterDataType;
22 import hunt.sql.visitor.SQLASTOutputVisitor;
23 import hunt.sql.visitor.SQLASTVisitor;
24 import hunt.sql.ast.expr.SQLTextLiteralExpr;
25 import hunt.sql.ast.expr.SQLValuableExpr;
26 import hunt.collection;
27 import hunt.String;
28 import hunt.util.Appendable;
29 import hunt.util.Common;
30 import hunt.util.StringBuilder;
31 
32 import std.concurrency : initOnce;
33 
34 public class SQLCharExpr : SQLTextLiteralExpr , SQLValuableExpr {
35 
36     static SQLDataType DEFAULT_DATA_TYPE() {
37         __gshared SQLDataType inst;
38         return initOnce!inst(new SQLCharacterDataType("varchar"));
39     }
40 
41     public this(){
42 
43     }
44 
45     public this(String text){
46         super(text);
47     }
48 
49     // public this(String text){
50     //     super(new String(text.value));
51     // }
52 
53     public this(string text){
54         super(new String(text));
55     }
56 
57     override public void output(StringBuilder buf) {
58         output(cast(Appendable) buf);
59     }
60 
61     public void output(Appendable buf) {
62         this.accept(new SQLASTOutputVisitor(buf));
63     }
64 
65     override  protected void accept0(SQLASTVisitor visitor) {
66         visitor.visit(this);
67         visitor.endVisit(this);
68     }
69 
70     override
71     public Object getValue() {
72         return this.text;
73     }
74     
75     override public string toString() {
76         return SQLUtils.toSQLString(this);
77     }
78 
79     override public SQLCharExpr clone() {
80         return new SQLCharExpr(this.text);
81     }
82 
83     override public SQLDataType computeDataType() {
84         return DEFAULT_DATA_TYPE;
85     }
86 
87     override public List!SQLObject getChildren() {
88         return Collections.emptyList!(SQLObject)();
89     }
90 }