content: /*
   * Copyright 1999-2017 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.statement;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLExprImpl;
  import com.alibaba.druid.sql.ast.SQLObject;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.List;
  
  public class SQLAssignItem extends SQLExprImpl implements SQLReplaceable {
      private SQLExpr target;
      private SQLExpr value;
  
      public SQLAssignItem() {
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          SQLAssignItem that = (SQLAssignItem) o;
  
          if (target != null ? !target.equals(that.target) : that.target != null) {
              return false;
          }
          return value != null ? value.equals(that.value) : that.value == null;
      }
  
      @Override
      public int hashCode() {
          int result = target != null ? target.hashCode() : 0;
          result = 31 * result + (value != null ? value.hashCode() : 0);
          return result;
      }
  
      public SQLAssignItem(SQLExpr target, SQLExpr value) {
          setTarget(target);
          setValue(value);
      }
  
      public SQLAssignItem clone() {
          SQLAssignItem x = new SQLAssignItem();
          if (target != null) {
              x.setTarget(target.clone());
          }
          if (value != null) {
              x.setValue(value.clone());
          }
          return x;
      }
  
      @Override
      public List<SQLObject> getChildren() {
          return null;
      }
  
      public SQLExpr getTarget() {
          return target;
      }
  
      public void setTarget(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.target = x;
      }
  
      public SQLExpr getValue() {
          return value;
      }
  
      public void setValue(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.value = x;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.target);
              acceptChild(visitor, this.value);
          }
          visitor.endVisit(this);
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (this.target == expr) {
              setTarget(target);
              return true;
          }
  
          if (this.value == expr) {
              setValue(target);
              return true;
          }
          return false;
      }
  }
  