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.expr;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLExprImpl;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLListExpr extends SQLExprImpl implements SQLReplaceable {
      private final List<SQLExpr> items;
  
      public SQLListExpr() {
          items = new ArrayList<SQLExpr>();
      }
  
      public SQLListExpr(SQLExpr... items) {
          this.items = new ArrayList<SQLExpr>(items.length);
          for (SQLExpr item : items) {
              item.setParent(this);
              this.items.add(item);
          }
      }
  
      public SQLListExpr(List<SQLExpr> items) {
          this.items = new ArrayList<>(items.size());
          for (SQLExpr item : items) {
              item.setParent(this);
              this.items.add(item);
          }
      }
  
      public List<SQLExpr> getItems() {
          return items;
      }
  
      public void addItem(SQLExpr item) {
          if (item != null) {
              item.setParent(this);
          }
          this.items.add(item);
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              for (int i = 0; i < items.size(); i++) {
                  SQLExpr item = items.get(i);
                  if (item != null) {
                      item.accept(visitor);
                  }
              }
          }
          visitor.endVisit(this);
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + 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;
          }
          SQLListExpr other = (SQLListExpr) obj;
          if (!items.equals(other.items)) {
              return false;
          }
          return true;
      }
  
      public SQLListExpr clone() {
          SQLListExpr x = new SQLListExpr();
          for (SQLExpr item : items) {
              SQLExpr item2 = item.clone();
              item2.setParent(x);
              x.items.add(item2);
          }
          return x;
      }
  
      public List getChildren() {
          return this.items;
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          for (int i = 0; i < items.size(); i++) {
              if (items.get(i) == expr) {
                  target.setParent(this);
                  items.set(i, target);
                  return true;
              }
          }
          return false;
      }
  }
  