/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.druid.sql.ast;
import java.util.ArrayList;
import java.util.List;
import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
import com.alibaba.druid.sql.visitor.SQLASTVisitor;
public class SQLOrderBy extends SQLObjectImpl {
protected final List<SQLSelectOrderByItem> items = new ArrayList<SQLSelectOrderByItem>();
public SQLOrderBy(){
}
public SQLOrderBy(SQLExpr expr){
SQLSelectOrderByItem item = new SQLSelectOrderByItem(expr);
item.setParent(this);
this.items.add(item);
}
public void addItem(SQLSelectOrderByItem item) {
if (item != null) {
item.setParent(this);
}
this.items.add(item);
}
public List<SQLSelectOrderByItem> getItems() {
return this.items;
}
protected void accept0(SQLASTVisitor visitor) {
if (visitor.visit(this)) {
acceptChild(visitor, this.items);
}
visitor.endVisit(this);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((items == null) ? 0 : items.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
SQLOrderBy other = (SQLOrderBy) obj;
if (items == null) {
if (other.items != null) return false;
} else if (!items.equals(other.items)) return false;
return true;
}
}