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.FastsqlException;
  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 java.math.BigDecimal;
  import java.math.BigInteger;
  
  public class SQLIntegerExpr extends SQLNumericLiteralExpr implements Comparable<SQLIntegerExpr> {
      public static final SQLDataType DATA_TYPE = new SQLDataTypeImpl("bigint");
  
      private Number number;
      private String type;
  
      public SQLIntegerExpr(Number number) {
          this();
          this.number = number;
      }
  
      public SQLIntegerExpr(Number number, SQLObject parent) {
          this();
          this.number = number;
          this.parent = parent;
      }
  
      public SQLIntegerExpr() {
          super(new SQLDataTypeImpl(SQLDataType.Constants.INT));
      }
  
      public Number getNumber() {
          return this.number;
      }
  
      public void setNumber(Number number) {
          this.number = number;
      }
  
      public void output(StringBuilder buf) {
          buf.append(this.number.toString());
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
  
          visitor.endVisit(this);
      }
  
      public String getType() {
          return type;
      }
  
      public void setType(String type) {
          this.type = type;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((number == null) ? 0 : number.hashCode());
          return result;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj == null) {
              return false;
          }
          if (getClass() != obj.getClass()) {
              return false;
          }
          SQLIntegerExpr other = (SQLIntegerExpr) obj;
          if (number == null) {
              if (other.number != null) {
                  return false;
              }
          } else if (!number.equals(other.number)) {
              return false;
          }
          return true;
      }
  
      @Override
      public Object getValue() {
          return this.number;
      }
  
      public SQLIntegerExpr clone() {
          return new SQLIntegerExpr(this.number);
      }
  
      public SQLDataType computeDataType() {
          return DATA_TYPE;
      }
  
      public void decrement() {
          if (number instanceof Integer) {
              number = Integer.valueOf((Integer) number.intValue() - 1);
          } else if (number instanceof Long) {
              number = Long.valueOf((Long) number.longValue() - 1);
          } else {
              throw new FastsqlException("decrement not support.");
          }
      }
  
      public static boolean isZero(SQLExpr expr) {
          if (expr instanceof SQLIntegerExpr) {
              Number number = ((SQLIntegerExpr) expr).getNumber();
              return number != null && number.intValue() == 0;
          }
          return false;
      }
  
      public static SQLIntegerExpr substract(SQLIntegerExpr a, SQLIntegerExpr b) {
          int val = a.number.intValue() - b.number.intValue();
          return new SQLIntegerExpr(val);
      }
  
      public static SQLIntegerExpr least(SQLIntegerExpr a, SQLIntegerExpr b) {
          if (a == null) {
              return b;
          }
  
          if (a.number.intValue() <= b.number.intValue()) {
              return a;
          }
  
          return b;
      }
  
      public static SQLIntegerExpr greatst(SQLIntegerExpr a, SQLIntegerExpr b) {
          if (a.number.intValue() >= b.number.intValue()) {
              return a;
          }
  
          return b;
      }
  
      public static SQLIntegerExpr ofIntOrLong(long value) {
          if (value >= Integer.MIN_VALUE && value <= Integer.MAX_VALUE) {
              return new SQLIntegerExpr((int) value);
          }
  
          return new SQLIntegerExpr(value);
      }
  
      public static SQLIntegerExpr add(long a, long b) {
          long r = a + b;
  
          if (a > 0 && b > 0 && r <= 0) {
              return new SQLIntegerExpr(BigInteger.valueOf(a).add(BigInteger.valueOf(b)));
          }
  
          return new SQLIntegerExpr(r);
      }
  
      @Override
      public int compareTo(SQLIntegerExpr o) {
          if (this.number instanceof Integer && o.number instanceof Integer) {
              return ((Integer) this.number).compareTo((Integer) o.number);
          }
  
          if (this.number instanceof Long && o.number instanceof Long) {
              return ((Long) this.number).compareTo((Long) o.number);
          }
  
          if (this.number instanceof BigDecimal && o.number instanceof BigDecimal) {
              return ((BigDecimal) this.number).compareTo((BigDecimal) o.number);
          }
  
          if (this.number instanceof Float && o.number instanceof Float) {
              return ((Float) this.number).compareTo((Float) o.number);
          }
  
          if (this.number instanceof Double && o.number instanceof Double) {
              return ((Double) this.number).compareTo((Double) o.number);
          }
  
          return -1;
      }
  
      public SQLIntegerExpr negative() {
          Number number = this.number;
          if (number instanceof Integer) {
              number = -number.intValue();
          } else if (number instanceof Long) {
              number = -number.longValue();
          } else if (number instanceof BigInteger) {
              number = ((BigInteger) number).negate();
          } else {
              throw new UnsupportedOperationException();
          }
          return new SQLIntegerExpr(number);
      }
  }
  