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.repository;
  
  import com.alibaba.druid.sql.ast.SQLDeclareItem;
  import com.alibaba.druid.sql.ast.SQLObject;
  import com.alibaba.druid.sql.ast.SQLOver;
  import com.alibaba.druid.sql.ast.SQLParameter;
  import com.alibaba.druid.sql.ast.expr.*;
  import com.alibaba.druid.sql.ast.statement.*;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static com.alibaba.druid.sql.repository.SchemaResolveVisitorFactory.*;
  
  /**
   * Created by wenshao on 03/08/2017.
   */
  public interface SchemaResolveVisitor extends SQLASTVisitor {
      boolean isEnabled(Option option);
  
      int getOptions();
  
      public static enum Option {
          ResolveAllColumn,
          ResolveIdentifierAlias,
          CheckColumnAmbiguous;
  
          private Option() {
              mask = (1 << ordinal());
          }
  
          public final int mask;
  
          public static int of(Option... options) {
              if (options == null) {
                  return 0;
              }
  
              int value = 0;
  
              for (Option option : options) {
                  value |= option.mask;
              }
  
              return value;
          }
      }
  
      SchemaRepository getRepository();
  
      Context getContext();
  
      Context createContext(SQLObject object);
  
      void popContext();
  
      public static class Context {
          public final Context parent;
          public final SQLObject object;
          public final int level;
  
          private SQLTableSource tableSource;
  
          private SQLTableSource from;
  
          private Map<Long, SQLTableSource> tableSourceMap;
  
          protected Map<Long, SQLDeclareItem> declares;
  
          public Context(SQLObject object, Context parent) {
              this.object = object;
              this.parent = parent;
              this.level = parent == null
                      ? 0
                      : parent.level + 1;
          }
  
          public SQLTableSource getFrom() {
              return from;
          }
  
          public void setFrom(SQLTableSource from) {
              this.from = from;
          }
  
          public SQLTableSource getTableSource() {
              return tableSource;
          }
  
          public void setTableSource(SQLTableSource tableSource) {
              this.tableSource = tableSource;
          }
  
          public void addTableSource(long alias_hash, SQLTableSource tableSource) {
              if (tableSourceMap == null) {
                  tableSourceMap = new HashMap<Long, SQLTableSource>();
              }
  
              tableSourceMap.put(alias_hash, tableSource);
          }
  
          protected void declare(SQLDeclareItem x) {
              if (declares == null) {
                  declares = new HashMap<Long, SQLDeclareItem>();
              }
              declares.put(x.getName().nameHashCode64(), x);
          }
  
          protected SQLDeclareItem findDeclare(long nameHash) {
              if (declares == null) {
                  return null;
              }
              return declares.get(nameHash);
          }
  
          protected SQLTableSource findTableSource(long nameHash) {
              SQLTableSource table = null;
              if (tableSourceMap != null) {
                  table = tableSourceMap.get(nameHash);
              }
  
              return table;
          }
  
          protected SQLTableSource findTableSourceRecursive(long nameHash) {
              for (Context ctx = this; ctx != null; ctx = ctx.parent) {
                  if (ctx.tableSourceMap != null) {
                      SQLTableSource table = ctx.tableSourceMap.get(nameHash);
                      if (table != null) {
                          return table;
                      }
                  }
              }
  
              return null;
          }
      }
  
      default boolean visit(SQLSelectStatement x) {
          resolve(this, x.getSelect());
          return false;
      }
  
      default boolean visit(SQLSelect x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLWithSubqueryClause x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLIfStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLCreateFunctionStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLExprTableSource x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLSelectQueryBlock x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLForeignKeyImpl x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLIdentifierExpr x) {
          resolveIdent(this, x);
          return true;
      }
  
      default boolean visit(SQLPropertyExpr x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLBinaryOpExpr x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLAllColumnExpr x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLCreateTableStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLUpdateStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLDeleteStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLAlterTableStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLInsertStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLParameter x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLDeclareItem x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLOver x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLMethodInvokeExpr x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLUnionQuery x) {
          resolveUnion(this, x);
          return false;
      }
  
      default boolean visit(SQLMergeStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLCreateProcedureStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLBlockStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLReplaceStatement x) {
          resolve(this, x);
          return false;
      }
  
      default boolean visit(SQLCastExpr x) {
          x.getExpr()
                  .accept(this);
          return true;
      }
  
      default boolean visit(SQLFetchStatement x) {
          resolve(this, x);
          return false;
      }
  }
  