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.dialect.oracle.ast.stmt;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
  import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
  import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
  import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
  import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
  import com.alibaba.druid.sql.dialect.oracle.ast.OracleSQLObject;
  import com.alibaba.druid.sql.dialect.oracle.ast.clause.ModelClause;
  import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class OracleSelectQueryBlock extends SQLSelectQueryBlock implements OracleSQLObject {
      private ModelClause modelClause;
  
      private boolean skipLocked;
  
      public OracleSelectQueryBlock clone() {
          OracleSelectQueryBlock x = new OracleSelectQueryBlock();
  
          super.cloneTo(x);
  
          if (modelClause != null) {
              x.setModelClause(modelClause.clone());
          }
  
          if (forUpdateOf != null) {
              for (SQLExpr item : forUpdateOf) {
                  SQLExpr item1 = item.clone();
                  item1.setParent(x);
                  x.getForUpdateOf().add(item1);
              }
          }
  
          x.skipLocked = skipLocked;
  
          return x;
      }
  
      public OracleSelectQueryBlock() {
          dbType = DbType.oracle;
      }
  
      public ModelClause getModelClause() {
          return modelClause;
      }
  
      public void setModelClause(ModelClause modelClause) {
          this.modelClause = modelClause;
      }
  
      public boolean isSkipLocked() {
          return skipLocked;
      }
  
      public void setSkipLocked(boolean skipLocked) {
          this.skipLocked = skipLocked;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor instanceof OracleASTVisitor) {
              accept0((OracleASTVisitor) visitor);
              return;
          }
  
          super.accept0(visitor);
      }
  
      public void accept0(OracleASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.hints);
              acceptChild(visitor, this.selectList);
              acceptChild(visitor, this.into);
              acceptChild(visitor, this.from);
              acceptChild(visitor, this.where);
              acceptChild(visitor, this.startWith);
              acceptChild(visitor, this.connectBy);
              acceptChild(visitor, this.groupBy);
              acceptChild(visitor, this.orderBy);
              acceptChild(visitor, this.waitTime);
              acceptChild(visitor, this.limit);
              acceptChild(visitor, this.modelClause);
              acceptChild(visitor, this.forUpdateOf);
          }
          visitor.endVisit(this);
      }
  
      public String toString() {
          return SQLUtils.toOracleString(this);
      }
  
      public void limit(int rowCount, int offset) {
          if (offset <= 0) {
              SQLExpr rowCountExpr = new SQLIntegerExpr(rowCount);
              SQLExpr newCondition = SQLUtils.buildCondition(SQLBinaryOperator.BooleanAnd, rowCountExpr, false,
                      where);
              setWhere(newCondition);
          } else {
              throw new UnsupportedOperationException("not support offset");
          }
      }
  
      public void setFrom(String tableName) {
          SQLExprTableSource from;
          if (tableName == null || tableName.length() == 0) {
              from = null;
          } else {
              from = new OracleSelectTableReference(new SQLIdentifierExpr(tableName));
          }
          this.setFrom(from);
      }
  }
  