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.mysql.ast.statement;
  
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLIndex;
  import com.alibaba.druid.sql.ast.SQLIndexDefinition;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.ast.SQLPartitionBy;
  import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
  import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
  import com.alibaba.druid.sql.ast.statement.*;
  import com.alibaba.druid.sql.dialect.mysql.ast.MySqlObject;
  import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.List;
  
  public class MySqlTableIndex extends SQLConstraintImpl implements SQLTableElement, SQLIndex, MySqlObject {
      private SQLIndexDefinition indexDefinition = new SQLIndexDefinition();
  
      public MySqlTableIndex() {
          indexDefinition.setParent(this);
      }
  
      public SQLIndexDefinition getIndexDefinition() {
          return indexDefinition;
      }
  
      public SQLName getName() {
          return indexDefinition.getName();
      }
  
      public String getIndexType() {
          return indexDefinition.getType();
      }
  
      public void setIndexType(String indexType) {
          indexDefinition.setType(indexType);
      }
  
      public void setName(SQLName name) {
          indexDefinition.setName(name);
      }
  
      public List<SQLSelectOrderByItem> getColumns() {
          return indexDefinition.getColumns();
      }
  
      public void addColumn(SQLSelectOrderByItem column) {
          if (column != null) {
              column.setParent(this);
          }
          this.indexDefinition.getColumns().add(column);
      }
  
      public void accept0(SQLASTVisitor visitor) {
          accept0((MySqlASTVisitor) visitor);
      }
  
      public void accept0(MySqlASTVisitor visitor) {
          if (visitor.visit(this)) {
              if (indexDefinition.getName() != null) {
                  indexDefinition.getName().accept(visitor);
              }
  
              for (int i = 0; i < indexDefinition.getColumns().size(); i++) {
                  final SQLSelectOrderByItem item = indexDefinition.getColumns().get(i);
                  if (item != null) {
                      item.accept(visitor);
                  }
              }
  
              for (int i = 0; i < indexDefinition.getCovering().size(); i++) {
                  final SQLName item = indexDefinition.getCovering().get(i);
                  if (item != null) {
                      item.accept(visitor);
                  }
              }
          }
          visitor.endVisit(this);
      }
  
      public MySqlTableIndex clone() {
          MySqlTableIndex x = new MySqlTableIndex();
          indexDefinition.cloneTo(x.indexDefinition);
          return x;
      }
  
      public boolean applyColumnRename(SQLName columnName, SQLColumnDefinition to) {
          for (SQLSelectOrderByItem orderByItem : getColumns()) {
              SQLExpr expr = orderByItem.getExpr();
              if (expr instanceof SQLName
                      && SQLUtils.nameEquals((SQLName) expr, columnName)) {
                  orderByItem.setExpr(to.getName().clone());
                  return true;
              }
  
              if (expr instanceof SQLMethodInvokeExpr
                      && SQLUtils.nameEquals(((SQLMethodInvokeExpr) expr).getMethodName(), columnName.getSimpleName())) {
                  // More complex when with key length.
                  if (1 == ((SQLMethodInvokeExpr) expr).getArguments().size() &&
                          ((SQLMethodInvokeExpr) expr).getArguments().get(0) instanceof SQLIntegerExpr) {
                      if (to.getDataType().hasKeyLength() &&
                              1 == to.getDataType().getArguments().size() &&
                              to.getDataType().getArguments().get(0) instanceof SQLIntegerExpr) {
                          int newKeyLength = ((SQLIntegerExpr) to.getDataType().getArguments().get(0)).getNumber().intValue();
                          int oldKeyLength = ((SQLIntegerExpr) ((SQLMethodInvokeExpr) expr).getArguments().get(0)).getNumber().intValue();
                          if (newKeyLength > oldKeyLength) {
                              // Change name and keep key length.
                              ((SQLMethodInvokeExpr) expr).setMethodName(to.getName().getSimpleName());
                              return true;
                          }
                      }
                      // Remove key length.
                      orderByItem.setExpr(to.getName().clone());
                      return true;
                  }
              }
          }
          return false;
      }
  
      public boolean applyDropColumn(SQLName columnName) {
          for (int i = indexDefinition.getColumns().size() - 1; i >= 0; i--) {
              SQLExpr expr = indexDefinition.getColumns().get(i).getExpr();
              if (expr instanceof SQLName
                      && SQLUtils.nameEquals((SQLName) expr, columnName)) {
                  indexDefinition.getColumns().remove(i);
                  return true;
              }
              if (expr instanceof SQLMethodInvokeExpr
                      && SQLUtils.nameEquals(((SQLMethodInvokeExpr) expr).getMethodName(), columnName.getSimpleName())) {
                  indexDefinition.getColumns().remove(i);
                  return true;
              }
          }
          return false;
      }
  
      public void addOption(String name, SQLExpr value) {
          indexDefinition.addOption(name, value);
      }
  
      public SQLExpr getOption(String name) {
          return indexDefinition.getOption(name);
      }
  
      protected SQLExpr getOption(long hash64) {
          return indexDefinition.getOption(hash64);
      }
  
      public String getDistanceMeasure() {
          return indexDefinition.getDistanceMeasure();
      }
  
      public String getAlgorithm() {
          return indexDefinition.getAlgorithm();
      }
  
      public List<SQLAssignItem> getOptions() {
          return indexDefinition.getCompatibleOptions();
      }
  
      public SQLExpr getComment() {
          return indexDefinition.getOptions().getComment();
      }
  
      public void setComment(SQLExpr x) {
          this.indexDefinition.getOptions().setComment(x);
      }
  
      public SQLExpr getDbPartitionBy() {
          return indexDefinition.getDbPartitionBy();
      }
  
      public void setDbPartitionBy(SQLExpr x) {
          indexDefinition.setDbPartitionBy(x);
      }
  
      public SQLExpr getTablePartitions() {
          return indexDefinition.getTbPartitions();
      }
  
      public void setTablePartitions(SQLExpr x) {
          indexDefinition.setTbPartitions(x);
      }
  
      public SQLExpr getTablePartitionBy() {
          return indexDefinition.getTbPartitionBy();
      }
  
      public void setTablePartitionBy(SQLExpr x) {
          indexDefinition.setTbPartitionBy(x);
      }
  
      public void setCovering(List<SQLName> covering) {
          indexDefinition.setCovering(covering);
      }
  
      public boolean isGlobal() {
          return this.indexDefinition.isGlobal();
      }
  
      public void setGlobal(boolean global) {
          this.indexDefinition.setGlobal(global);
      }
  
      public boolean isLocal() {
          return this.indexDefinition.isLocal();
      }
  
      public void setLocal(boolean local) {
          this.indexDefinition.setLocal(local);
      }
  
      @Override
      public List<SQLName> getCovering() {
          return indexDefinition.getCovering();
      }
  
      public SQLName getIndexAnalyzerName() {
          return indexDefinition.getIndexAnalyzerName();
      }
  
      public void setIndexAnalyzerName(SQLName indexAnalyzerName) {
          this.indexDefinition.setIndexAnalyzerName(indexAnalyzerName);
      }
  
      public SQLName getQueryAnalyzerName() {
          return indexDefinition.getQueryAnalyzerName();
      }
  
      public void setQueryAnalyzerName(SQLName queryAnalyzerName) {
          this.indexDefinition.setQueryAnalyzerName(queryAnalyzerName);
      }
  
      public void setPartitioning(SQLPartitionBy sqlPartitioning) {
          this.indexDefinition.setPartitioning(sqlPartitioning);
      }
  
      public SQLPartitionBy getPartitioning() {
          return this.indexDefinition.getPartitioning();
      }
  
      public SQLName getWithDicName() {
          return indexDefinition.getWithDicName();
      }
  
      public void setWithDicName(SQLName withDicName) {
          this.indexDefinition.setWithDicName(withDicName);
      }
  
      public SQLName getAnalyzerName() {
          return indexDefinition.getAnalyzerName();
      }
  
      public void setAnalyzerName(SQLName analyzerName) {
          this.indexDefinition.setAnalyzerName(analyzerName);
      }
  }
  