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.SQLName;
  import com.alibaba.druid.sql.ast.SQLObject;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLSubqueryTableSource extends SQLTableSourceImpl {
      protected SQLSelect select;
      protected List<SQLName> columns = new ArrayList<SQLName>();
  
      public SQLSubqueryTableSource() {
      }
  
      public SQLSubqueryTableSource(String alias) {
          super(alias);
      }
  
      public SQLSubqueryTableSource(SQLSelect select, String alias) {
          super(alias);
          this.setSelect(select);
      }
  
      public SQLSubqueryTableSource(SQLSelect select) {
          this.setSelect(select);
      }
  
      public SQLSubqueryTableSource(SQLSelectQuery query) {
          this(new SQLSelect(query));
      }
  
      public SQLSubqueryTableSource(SQLSelectQuery query, String alias) {
          this(new SQLSelect(query), alias);
      }
  
      public SQLSelect getSelect() {
          return this.select;
      }
  
      public void setSelect(SQLSelect x) {
          if (x != null) {
              x.setParent(this);
          }
          this.select = x;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.select);
              super.accept0(visitor);
          }
          visitor.endVisit(this);
      }
  
      public SQLObject resolveColumn(long columnNameHash) {
          if (select != null) {
              SQLSelectQueryBlock queryBlock = select.getQueryBlock();
              if (queryBlock != null) {
                  return queryBlock.findSelectItem(columnNameHash);
              }
          }
          return null;
      }
  
      public void cloneTo(SQLSubqueryTableSource x) {
          x.alias = alias;
  
          if (select != null) {
              x.select = select.clone();
              x.select.setParent(x);
          }
  
          for (SQLName column : columns) {
              SQLName c2 = column.clone();
              c2.setParent(x);
              x.columns.add(c2);
          }
      }
  
      public SQLSubqueryTableSource clone() {
          SQLSubqueryTableSource x = new SQLSubqueryTableSource();
          cloneTo(x);
          return x;
      }
  
      public SQLTableSource findTableSourceWithColumn(String columnName) {
          if (select == null) {
              return null;
          }
  
          SQLSelectQueryBlock queryBlock = select.getFirstQueryBlock();
          if (queryBlock == null) {
              return null;
          }
  
          if (queryBlock.findSelectItem(columnName) != null) {
              return this;
          }
  
          return null;
      }
  
      public SQLTableSource findTableSourceWithColumn(long columnNameHash, String columnName, int option) {
          if (select == null) {
              return null;
          }
  
          SQLSelectQueryBlock queryBlock = select.getFirstQueryBlock();
          if (queryBlock == null) {
              return null;
          }
  
          if (queryBlock.findSelectItem(columnNameHash) != null) {
              return this;
          }
  
          return null;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          SQLSubqueryTableSource that = (SQLSubqueryTableSource) o;
  
          return select != null ? select.equals(that.select) : that.select == null;
      }
  
      @Override
      public int hashCode() {
          return select != null ? select.hashCode() : 0;
      }
  
      public List<SQLName> getColumns() {
          return columns;
      }
  
      public void addColumn(SQLName column) {
          column.setParent(this);
          this.columns.add(column);
      }
  
      public SQLColumnDefinition findColumn(long columnNameHash) {
          SQLSelectQueryBlock queryBlock = select.getFirstQueryBlock();
          if (queryBlock != null) {
              return queryBlock.findColumn(columnNameHash);
          } else {
              if (select.getQuery() instanceof SQLUnionQuery && ((SQLUnionQuery) select.getQuery()).getFirstQueryBlock() instanceof SQLSelectQueryBlock) {
                  SQLSelectQueryBlock left = ((SQLUnionQuery) select.getQuery()).getFirstQueryBlock();
                  return ((SQLSelectQueryBlock) left).findColumn(columnNameHash);
              }
          }
          return null;
      }
  
      public SQLColumnDefinition findColumn(String columnName) {
          SQLSelectQueryBlock queryBlock = select.getFirstQueryBlock();
          if (queryBlock != null) {
              return queryBlock.findColumn(columnName);
          } else {
              if (select.getQuery() instanceof SQLUnionQuery && ((SQLUnionQuery) select.getQuery()).getFirstQueryBlock() instanceof SQLSelectQueryBlock) {
                  SQLSelectQueryBlock left = ((SQLUnionQuery) select.getQuery()).getFirstQueryBlock();
                  return ((SQLSelectQueryBlock) left).findColumn(columnName);
              }
          }
          return null;
      }
  
      public static SQLSubqueryTableSource fixParenthesized(SQLSubqueryTableSource rightTableSourceTmp) {
          if (rightTableSourceTmp.getSelect() != null && rightTableSourceTmp.getSelect().getQuery() != null && rightTableSourceTmp.getSelect()
              .getQuery().isParenthesized()) {
              rightTableSourceTmp.getSelect().getQuery().setParenthesized(false);
          }
          return rightTableSourceTmp;
      }
  }
  