content: package com.alibaba.druid.sql.ast.statement;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLUnnestTableSource extends SQLTableSourceImpl
          implements SQLReplaceable {
      private final List<SQLExpr> items = new ArrayList<SQLExpr>();
      protected List<SQLName> columns = new ArrayList<SQLName>();
      private boolean ordinality;
      private SQLExpr offset;
  
      public SQLUnnestTableSource() {
      }
  
      @Override
      protected void accept0(SQLASTVisitor v) {
          if (v.visit(this)) {
              acceptChild(v, items);
              acceptChild(v, columns);
              acceptChild(v, offset);
              super.accept0(v);
          }
          v.endVisit(this);
      }
  
      public List<SQLName> getColumns() {
          return columns;
      }
  
      public void addColumn(SQLName column) {
          column.setParent(this);
          this.columns.add(column);
      }
  
      public boolean isOrdinality() {
          return ordinality;
      }
  
      public void setOrdinality(boolean ordinality) {
          this.ordinality = ordinality;
      }
  
      public List<SQLExpr> getItems() {
          return items;
      }
  
      public void addItem(SQLExpr item) {
          item.setParent(this);
          this.items.add(item);
      }
  
      public void setItem(int i, SQLExpr item) {
          this.items.set(i, item);
      }
  
      public SQLExpr getOffset() {
          return offset;
      }
  
      public void setOffset(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.offset = x;
      }
  
      public SQLUnnestTableSource clone() {
          SQLUnnestTableSource x = new SQLUnnestTableSource();
  
          for (SQLExpr item : items) {
              SQLExpr item2 = item.clone();
              item2.setParent(x);
              x.items.add(item2);
          }
  
          for (SQLName column : columns) {
              SQLName c2 = column.clone();
              c2.setParent(x);
              x.columns.add(c2);
          }
  
          x.alias = alias;
  
          if (offset != null) {
              x.setOffset(offset);
          }
  
          return x;
      }
  
      @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;
              }
          }
  
          if (target instanceof SQLName) {
              SQLName targetName = (SQLName) target;
              for (int i = 0; i < columns.size(); i++) {
                  if (columns.get(i) == expr) {
                      target.setParent(this);
                      columns.set(i, targetName);
                      return true;
                  }
              }
          }
          return false;
      }
  }
  