Android Open Source - Jello Expression

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License

The source code is released under:
Apache License
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Java Source Code

package com.atteo.jello;
/*from   ww  w  . j av a  2 s. c  o  m*/
import java.util.ArrayList;

public class Expression {
  public static final int OPERATOR_GREATER = 0;
  public static final int OPERATOR_LOWER = 1;
  public static final int OPERATOR_GREATER_EQUAL = 2;
  public static final int OPERATOR_LOWER_EQUAL = 3;
  public static final int OPERATOR_EQUAL = 4;
  public static final int OPERATOR_NOT_EQUAL = 5;
  public static final int OPERATOR_IN = 7;
  public static final int OPERATOR_OR = 8;
  public static final int OPERATOR_AND = 9;

  public Expression(Object left, int operator, Object right) {
    this.left = left;
    this.operator = operator;
    this.right = right;
  }

  @SuppressWarnings("unchecked")
  public boolean evaluate(Storable storable) {
    Object leftValue = left, rightValue = right;
    if (leftValue instanceof String && ((String) leftValue).startsWith("."))
      leftValue = storable.getDbFieldValue(((String) leftValue).substring(1));

    if (rightValue instanceof String && ((String) rightValue).startsWith("."))
      rightValue = storable.getDbFieldValue(((String) rightValue).substring(1));

    if (leftValue instanceof Expression)
      leftValue = ((Expression) leftValue).evaluate(storable);

    if (rightValue instanceof Expression)
      rightValue = ((Expression) rightValue).evaluate(storable);

    switch (operator) {
    case OPERATOR_EQUAL:
      return leftValue.equals(rightValue);
    case OPERATOR_NOT_EQUAL:
      return !leftValue.equals(rightValue);
    case OPERATOR_AND:
      return (Boolean) leftValue && (Boolean) rightValue;
    case OPERATOR_OR:
      return (Boolean) leftValue || (Boolean) rightValue;
    case OPERATOR_GREATER:
      if (leftValue instanceof Double)
        return (Double) leftValue > (Double) rightValue;
      if (leftValue instanceof Float)
        return (Float) leftValue > (Float) rightValue;
      if (leftValue instanceof Integer)
        return (Integer) leftValue > (Integer) rightValue;
      if (leftValue instanceof Long)
        return (Long) leftValue > (Long) rightValue;
      if (leftValue instanceof Short)
        return (Short) leftValue > (Short) rightValue;

      throw new RuntimeException("Unknown datatype");
    case OPERATOR_GREATER_EQUAL:
      if (leftValue instanceof Double)
        return (Double) leftValue >= (Double) rightValue;
      if (leftValue instanceof Float)
        return (Float) leftValue >= (Float) rightValue;
      if (leftValue instanceof Integer)
        return (Integer) leftValue >= (Integer) rightValue;
      if (leftValue instanceof Long)
        return (Long) leftValue >= (Long) rightValue;
      if (leftValue instanceof Short)
        return (Short) leftValue >= (Short) rightValue;
      throw new RuntimeException("Unknown datatype");
    case OPERATOR_LOWER:
      if (leftValue instanceof Double)
        return (Double) leftValue < (Double) rightValue;
      if (leftValue instanceof Float)
        return (Float) leftValue < (Float) rightValue;
      if (leftValue instanceof Integer)
        return (Integer) leftValue < (Integer) rightValue;
      if (leftValue instanceof Long)
        return (Long) leftValue < (Long) rightValue;
      if (leftValue instanceof Short)
        return (Short) leftValue < (Short) rightValue;
      throw new RuntimeException("Unknown datatype");
    case OPERATOR_LOWER_EQUAL:
      if (leftValue instanceof Double)
        return (Double) leftValue <= (Double) rightValue;
      if (leftValue instanceof Float)
        return (Float) leftValue <= (Float) rightValue;
      if (leftValue instanceof Integer)
        return (Integer) leftValue <= (Integer) rightValue;
      if (leftValue instanceof Long)
        return (Long) leftValue <= (Long) rightValue;
      if (leftValue instanceof Short)
        return (Short) leftValue <= (Short) rightValue;
      throw new RuntimeException("Unknown datatype");
    case OPERATOR_IN:
      ArrayList<Storable> storables = ((StorableCollection<Storable>) rightValue)
          .toArrayList();
      int l = storables.size();
      int id = (Integer) leftValue;
      for (int i = 0; i < l; i++)
        if (storables.get(i).getId() == id)
          return true;
      return false;
    }

    return false;
  }

  int operator;
  Object left;
  Object right;
}
Java Source Code List
