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.ast.SQLDataType;
  import com.alibaba.druid.sql.ast.SQLDataTypeImpl;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLObject;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  import com.alibaba.druid.util.Utils;
  
  import java.math.BigDecimal;
  
  public class SQLNumberExpr extends SQLNumericLiteralExpr implements SQLValuableExpr {
      public static final SQLDataType DATA_TYPE_NUMBER = new SQLDataTypeImpl("number");
  
      public static final SQLDataType DATA_TYPE_DOUBLE = new SQLDataTypeImpl("double");
      public static final SQLDataType DATA_TYPE_BIGINT = SQLIntegerExpr.DATA_TYPE;
  
      private char[] chars;
  
      public SQLNumberExpr() {
          super(new SQLDataTypeImpl(SQLDataType.Constants.NUMBER));
      }
  
      public SQLNumberExpr(Number number) {
          this();
          this.value = number;
      }
  
      public SQLNumberExpr(char[] chars, SQLObject parent) {
          this();
          this.chars = chars;
          this.parent = parent;
      }
  
      public SQLNumberExpr(char[] chars) {
          this();
          this.chars = chars;
      }
  
      public Number getNumber() {
          if (chars != null && value == null) {
              boolean exp = false;
              for (int i = 0; i < chars.length; i++) {
                  char ch = chars[i];
                  if (ch == 'e' || ch == 'E') {
                      exp = true;
                  }
              }
              if (exp) {
                  this.value = Double.parseDouble(new String(chars));
              } else {
                  this.value = new BigDecimal(chars);
              }
          }
          return getValue();
      }
  
      public Number getValue() {
          return (Number) value;
      }
  
      public void setNumber(Number number) {
          this.value = number;
          this.chars = null;
      }
  
      public void output(StringBuilder buf) {
          if (chars != null) {
              buf.append(chars);
          } else {
              buf.append(this.value.toString());
          }
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
          visitor.endVisit(this);
      }
  
      @Override
      public int hashCode() {
          Number number = getNumber();
          if (number == null) {
              return 0;
          }
  
          return number.hashCode();
      }
  
      @Override
      public boolean equals(Object obj) {
          if (chars != null && value == null) {
              this.value = new BigDecimal(chars);
          }
  
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
  
          SQLNumberExpr other = (SQLNumberExpr) obj;
          return Utils.equals(getNumber(), other.getNumber());
      }
  
      public SQLNumberExpr clone() {
          SQLNumberExpr x = new SQLNumberExpr();
          x.chars = chars;
          x.value = value;
          return x;
      }
  
      public SQLDataType computeDataType() {
          return DATA_TYPE_NUMBER;
      }
  
      public static boolean isZero(SQLExpr x) {
          if (x instanceof SQLNumberExpr) {
              Number number = ((SQLNumberExpr) x).getNumber();
              if (number instanceof Integer) {
                  return number.intValue() == 0;
              } else if (number instanceof Long) {
                  return number.longValue() == 0L;
              }
          }
  
          return false;
      }
  
      public static boolean isOne(SQLExpr x) {
          if (x instanceof SQLNumberExpr) {
              Number number = ((SQLNumberExpr) x).getNumber();
              if (number instanceof Integer) {
                  return number.intValue() == 1;
              } else if (number instanceof Long) {
                  return number.longValue() == 1L;
              }
          }
  
          return false;
      }
  }
  