hunt.sql.ast.expr.SQLFlashbackExpr 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.SQLFlashbackExpr;
17 
18 import hunt.sql.ast.SQLExpr;
19 import hunt.sql.ast.SQLExprImpl;
20 import hunt.sql.ast.SQLObject;
21 import hunt.sql.visitor.SQLASTVisitor;
22 import hunt.collection;
23 
24 /**
25  * Created by wenshao on 14/06/2017.
26  */
27 public class SQLFlashbackExpr : SQLExprImpl {
28     private Type type;
29     private SQLExpr expr;
30 
31     public this() {
32 
33     }
34 
35     public this(Type type, SQLExpr expr) {
36         this.type = type;
37         this.setExpr(expr);
38     }
39 
40     public Type getType() {
41         return type;
42     }
43 
44     public void setType(Type type) {
45         this.type = type;
46     }
47 
48     public SQLExpr getExpr() {
49         return expr;
50     }
51 
52     public void setExpr(SQLExpr expr) {
53         if (expr !is null) {
54             expr.setParent(this);
55         }
56         this.expr = expr;
57     }
58 
59     override  protected void accept0(SQLASTVisitor visitor) {
60         if (visitor.visit(this)) {
61             acceptChild(visitor, expr);
62         }
63         visitor.endVisit(this);
64     }
65 
66    override
67     public List!SQLObject getChildren() {
68         return Collections.singletonList!SQLObject(expr);
69     }
70 
71     override public SQLFlashbackExpr clone() {
72         SQLFlashbackExpr x = new SQLFlashbackExpr();
73         x.type = this.type;
74         if (expr !is null) {
75             x.setExpr(expr.clone());
76         }
77         return x;
78     }
79 
80    override
81     public bool opEquals(Object o) {
82         if (this == o) return true;
83         if (o is null || typeid(this) != typeid(o)) return false;
84 
85         SQLFlashbackExpr that = cast(SQLFlashbackExpr) o;
86 
87         if (type != that.type) return false;
88         return expr !is null ? (cast(Object)(expr)).opEquals(cast(Object)(that.expr)) : that.expr is null;
89     }
90 
91    override
92     public size_t toHash() @trusted nothrow {
93         size_t result = hashOf(type);
94         result = 31 * result + (expr !is null ? (cast(Object)expr).toHash() : 0);
95         return result;
96     }
97 
98     public static struct Type {
99         enum Type SCN = Type("");
100         enum Type TIMESTAMP = Type("");
101 
102         private string _name;
103 
104         this(string name)
105         {
106             _name = name;
107         }
108 
109         @property string name()
110         {
111             return _name;
112         }
113 
114         bool opEquals(const Type h) nothrow {
115             return _name == h._name ;
116         } 
117 
118         bool opEquals(ref const Type h) nothrow {
119             return _name == h._name ;
120         } 
121     }
122 }