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.SQLUtils;
  import com.alibaba.druid.sql.ast.*;
  import com.alibaba.druid.sql.ast.statement.*;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  import com.alibaba.druid.util.FnvHash;
  
  import java.util.Collections;
  import java.util.List;
  
  public final class SQLIdentifierExpr extends SQLExprImpl implements SQLName, Comparable<SQLIdentifierExpr> {
      protected String name;
      protected long hashCode64;
  
      private SQLObject resolvedColumn;
      private SQLObject resolvedOwnerObject;
  
      protected String collate;
  
      public SQLIdentifierExpr() {
      }
  
      public SQLIdentifierExpr(String name) {
          this.name = name;
      }
  
      public SQLIdentifierExpr(String name, long hash_lower) {
          this.name = name;
          this.hashCode64 = hash_lower;
      }
  
      public String getSimpleName() {
          return name;
      }
  
      public String getLowerName() {
          if (name == null) {
              return null;
          }
  
          return name.toLowerCase();
      }
  
      public String getName() {
          return this.name;
      }
  
      public void setName(String name) {
          this.name = name;
          this.hashCode64 = 0L;
  
          if (parent instanceof SQLPropertyExpr) {
              SQLPropertyExpr propertyExpr = (SQLPropertyExpr) parent;
              propertyExpr.computeHashCode64();
          }
      }
  
      public String getCollate() {
          return collate;
      }
  
      public void setCollate(String collate) {
          this.collate = collate;
      }
  
      public long nameHashCode64() {
          return hashCode64();
      }
  
      @Override
      public long hashCode64() {
          if (hashCode64 == 0
                  && name != null) {
              if (collate != null) {
                  hashCode64 = FnvHash.hashCode64(name + collate);
              } else {
                  hashCode64 = FnvHash.hashCode64(name);
              }
          }
          return hashCode64;
      }
  
      public void output(StringBuilder buf) {
          buf.append(this.name);
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
  
          visitor.endVisit(this);
      }
  
      @Override
      public int hashCode() {
          long value = hashCode64();
          return (int) (value ^ (value >>> 32));
      }
  
      @Override
      public boolean equals(Object obj) {
          if (obj instanceof SQLPropertyExpr) {
              return ((SQLPropertyExpr) obj).equals(this);
          }
  
          if (!(obj instanceof SQLIdentifierExpr)) {
              return false;
          }
  
          SQLIdentifierExpr other = (SQLIdentifierExpr) obj;
          return this.hashCode64() == other.hashCode64();
      }
  
      public String toString() {
          return this.name;
      }
  
      public SQLIdentifierExpr clone() {
          SQLIdentifierExpr x = new SQLIdentifierExpr(this.name, hashCode64);
          x.resolvedColumn = resolvedColumn;
          x.resolvedOwnerObject = resolvedOwnerObject;
  
          if (hint != null) {
              x.hint = hint.clone();
          }
          x.collate = collate;
          return x;
      }
  
      public SQLIdentifierExpr simplify() {
          String normalized = SQLUtils.normalize(name);
          if (normalized != name) {
              return new SQLIdentifierExpr(normalized, hashCode64);
          }
          return this;
      }
  
      public String normalizedName() {
          return SQLUtils.normalize(name);
      }
  
      public SQLColumnDefinition getResolvedColumn() {
          if (resolvedColumn instanceof SQLColumnDefinition) {
              return (SQLColumnDefinition) resolvedColumn;
          }
  
          if (resolvedColumn instanceof SQLSelectItem) {
              SQLSelectItem selectItem = (SQLSelectItem) resolvedColumn;
              final SQLExpr expr = selectItem.getExpr();
              if (expr instanceof SQLIdentifierExpr && expr != this) {
                  return ((SQLIdentifierExpr) expr).getResolvedColumn();
              } else if (expr instanceof SQLPropertyExpr) {
                  return ((SQLPropertyExpr) expr).getResolvedColumn();
              }
          }
  
          return null;
      }
  
      public SQLSelectItem getResolvedSelectItem() {
          if (resolvedColumn instanceof SQLSelectItem) {
              return (SQLSelectItem) resolvedColumn;
          }
  
          return null;
      }
  
      public SQLObject getResolvedColumnObject() {
          return resolvedColumn;
      }
  
      public void setResolvedColumn(SQLColumnDefinition resolvedColumn) {
          this.resolvedColumn = resolvedColumn;
      }
  
      public void setResolvedColumn(SQLObject resolvedColumn) {
          this.resolvedColumn = resolvedColumn;
      }
  
      public void setResolvedColumn(SQLSelectItem selectItem) {
          this.resolvedColumn = selectItem;
      }
  
      public SQLTableSource getResolvedTableSource() {
          if (resolvedOwnerObject instanceof SQLTableSource) {
              return (SQLTableSource) resolvedOwnerObject;
          }
  
          return null;
      }
  
      public void setResolvedTableSource(SQLTableSource resolvedTableSource) {
          this.resolvedOwnerObject = resolvedTableSource;
      }
  
      public SQLObject getResolvedOwnerObject() {
          return resolvedOwnerObject;
      }
  
      public void setResolvedOwnerObject(SQLObject resolvedOwnerObject) {
          this.resolvedOwnerObject = resolvedOwnerObject;
      }
  
      public SQLParameter getResolvedParameter() {
          if (resolvedColumn instanceof SQLParameter) {
              return (SQLParameter) this.resolvedColumn;
          }
          return null;
      }
  
      public void setResolvedParameter(SQLParameter resolvedParameter) {
          this.resolvedColumn = resolvedParameter;
      }
  
      public SQLDeclareItem getResolvedDeclareItem() {
          if (resolvedColumn instanceof SQLDeclareItem) {
              return (SQLDeclareItem) this.resolvedColumn;
          }
          return null;
      }
  
      public void setResolvedDeclareItem(SQLDeclareItem resolvedDeclareItem) {
          this.resolvedColumn = resolvedDeclareItem;
      }
  
      public SQLDataType computeDataType() {
          SQLColumnDefinition resolvedColumn = getResolvedColumn();
          if (resolvedColumn != null) {
              return resolvedColumn.getDataType();
          }
  
          if (this.resolvedColumn instanceof SQLSelectItem) {
              if (((SQLSelectItem) this.resolvedColumn).getExpr() != this) {
                  return ((SQLSelectItem) this.resolvedColumn).computeDataType();
              }
              return null;
          }
  
          SQLSelectQueryBlock queryBlock = null;
          if (resolvedOwnerObject instanceof SQLSubqueryTableSource) {
              SQLSelect select = ((SQLSubqueryTableSource) resolvedOwnerObject).getSelect();
              queryBlock = select.getFirstQueryBlock();
          } else if (resolvedOwnerObject instanceof SQLUnionQueryTableSource) {
              SQLUnionQuery union = ((SQLUnionQueryTableSource) resolvedOwnerObject).getUnion();
              queryBlock = union.getFirstQueryBlock();
          } else if (resolvedOwnerObject instanceof SQLWithSubqueryClause.Entry) {
              queryBlock = ((SQLWithSubqueryClause.Entry) resolvedOwnerObject)
                      .getSubQuery()
                      .getFirstQueryBlock();
          }
  
          if (queryBlock != null) {
              SQLSelectItem selectItem = queryBlock.findSelectItem(nameHashCode64());
              if (selectItem != null) {
                  return selectItem.computeDataType();
              }
          }
  
          for (SQLObject parent = this.parent; parent != null; parent = parent.getParent()) {
              if (parent instanceof SQLCreateFunctionStatement) {
                  SQLCreateFunctionStatement createFunction = (SQLCreateFunctionStatement) parent;
                  SQLParameter parameter = createFunction.getParameter(this.name);
                  return parameter != null ? parameter.computeDataType() : null;
              }
          }
  
          return null;
      }
  
      public boolean nameEquals(String name) {
          return SQLUtils.nameEquals(this.name, name);
      }
  
      @Override
      public List<SQLObject> getChildren() {
          return Collections.emptyList();
      }
  
      public static boolean matchIgnoreCase(SQLExpr expr, String name) {
          if (!(expr instanceof SQLIdentifierExpr)) {
              return false;
          }
          SQLIdentifierExpr ident = (SQLIdentifierExpr) expr;
          return ident.getName().equalsIgnoreCase(name);
      }
  
      @Override
      public int compareTo(SQLIdentifierExpr o) {
          return this.normalizedName()
                  .compareTo(
                          o.normalizedName());
      }
  }
  