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.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.ast.SQLObjectImpl;
  import com.alibaba.druid.sql.ast.SQLReplaceable;
  import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
  import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class SQLUpdateSetItem extends SQLObjectImpl implements SQLReplaceable {
      private SQLExpr column;
      private SQLExpr value;
  
      public SQLUpdateSetItem() {
      }
  
      public SQLUpdateSetItem(SQLExpr column, SQLExpr value) {
          this.setColumn(column);
          this.setValue(value);
      }
  
      public SQLExpr getColumn() {
          return column;
      }
  
      public void cloneTo(SQLUpdateSetItem x) {
          if (column != null) {
              x.column = column.clone();
              x.column.setParent(x);
          }
          if (value != null) {
              x.value = value.clone();
              x.value.setParent(x);
          }
      }
  
      @Override
      public SQLUpdateSetItem clone() {
          SQLUpdateSetItem x = new SQLUpdateSetItem();
          cloneTo(x);
          return x;
      }
  
      public void setColumn(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.column = x;
      }
  
      public SQLExpr getValue() {
          return value;
      }
  
      public void setValue(SQLExpr value) {
          if (value != null) {
              value.setParent(this);
          }
          this.value = value;
      }
  
      public void output(StringBuilder buf) {
          column.output(buf);
          buf.append(" = ");
          value.output(buf);
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              if (column != null) {
                  column.accept(visitor);
              }
  
              if (value != null) {
                  value.accept(visitor);
              }
          }
  
          visitor.endVisit(this);
      }
  
      public boolean columnMatch(String column) {
          if (this.column instanceof SQLIdentifierExpr) {
              return ((SQLIdentifierExpr) this.column).nameEquals(column);
          } else if (this.column instanceof SQLPropertyExpr) {
              ((SQLPropertyExpr) this.column).nameEquals(column);
          }
          return false;
      }
  
      public boolean columnMatch(long columnHash) {
          if (this.column instanceof SQLName) {
              return ((SQLName) this.column).nameHashCode64() == columnHash;
          }
  
          return false;
      }
  
      @Override
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (expr == this.column) {
              this.setColumn(target);
              return true;
          }
  
          if (expr == this.value) {
              setValue(target);
              return true;
          }
          return false;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          SQLUpdateSetItem that = (SQLUpdateSetItem) o;
  
          if (column != null ? !column.equals(that.column) : that.column != null) {
              return false;
          }
          return value != null ? value.equals(that.value) : that.value == null;
      }
  
      @Override
      public int hashCode() {
          int result = column != null ? column.hashCode() : 0;
          result = 31 * result + (value != null ? value.hashCode() : 0);
          return result;
      }
  }
  