coercions.java

jBpm是一个灵活可扩展的工作流管理系统。作为jBpm运行时server输入的业务流程使用简单强大的语言表达并打包在流程档案中

  //-------------------------------------
  /**
   *
   * Coerces a value to the given primitive number class
   **/
  public static Number coerceToPrimitiveNumber (Object pValue,
						Class pClass,
						Logger pLogger)
    throws ELException
  {
    if (pValue == null ||
	"".equals (pValue)) {
      return coerceToPrimitiveNumber (ZERO, pClass);
    }
    else if (pValue instanceof Character) {
      char val = ((Character) pValue).charValue ();
      return coerceToPrimitiveNumber (new Short((short) val), pClass);
    }
    else if (pValue instanceof Boolean) {
      if (pLogger.isLoggingError ()) {
	pLogger.logError (Constants.BOOLEAN_TO_NUMBER,
			  pValue,
			  pClass.getName ());
      }
      return coerceToPrimitiveNumber (ZERO, pClass);
    }
    else if (pValue.getClass () == pClass) {
      return (Number) pValue;
    }
    else if (pValue instanceof Number) {
      return coerceToPrimitiveNumber ((Number) pValue, pClass);
    }
    else if (pValue instanceof String) {
      try {
	return coerceToPrimitiveNumber ((String) pValue, pClass);
      }
      catch (Exception exc) {
	if (pLogger.isLoggingError ()) {
	  pLogger.logError
	    (Constants.STRING_TO_NUMBER_EXCEPTION,
	     (String) pValue,
	     pClass.getName ());
	}
	return coerceToPrimitiveNumber (ZERO, pClass);
      }
    }
    else {
      if (pLogger.isLoggingError ()) {
	pLogger.logError
	  (Constants.COERCE_TO_NUMBER,
	   pValue.getClass ().getName (),
	   pClass.getName ());
      }
      return coerceToPrimitiveNumber (0, pClass);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a value to an Integer, returning null if the coercion
   * isn't possible.
   **/
  public static Integer coerceToInteger (Object pValue,
					 Logger pLogger)
    throws ELException
  {
    if (pValue == null) {
      return null;
    }
    else if (pValue instanceof Character) {
      return PrimitiveObjects.getInteger 
	((int) (((Character) pValue).charValue ()));
    }
    else if (pValue instanceof Boolean) {
      if (pLogger.isLoggingWarning ()) {
	pLogger.logWarning (Constants.BOOLEAN_TO_NUMBER,
			    pValue,
			    Integer.class.getName ());
      }
      return PrimitiveObjects.getInteger
	(((Boolean) pValue).booleanValue () ? 1 : 0);
    }
    else if (pValue instanceof Integer) {
      return (Integer) pValue;
    }
    else if (pValue instanceof Number) {
      return PrimitiveObjects.getInteger (((Number) pValue).intValue ());
    }
    else if (pValue instanceof String) {
      try {
	return Integer.valueOf ((String) pValue);
      }
      catch (Exception exc) {
	if (pLogger.isLoggingWarning ()) {
	  pLogger.logWarning
	    (Constants.STRING_TO_NUMBER_EXCEPTION,
	     (String) pValue,
	     Integer.class.getName ());
	}
	return null;
      }
    }
    else {
      if (pLogger.isLoggingWarning ()) {
	pLogger.logWarning
	  (Constants.COERCE_TO_NUMBER,
	   pValue.getClass ().getName (),
	   Integer.class.getName ());
      }
      return null;
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a long to the given primitive number class
   **/
  static Number coerceToPrimitiveNumber (long pValue,
					 Class pClass)
    throws ELException
  {
    if (pClass == Byte.class || pClass == Byte.TYPE) {
      return PrimitiveObjects.getByte ((byte) pValue);
    }
    else if (pClass == Short.class || pClass == Short.TYPE) {
      return PrimitiveObjects.getShort ((short) pValue);
    }
    else if (pClass == Integer.class || pClass == Integer.TYPE) {
      return PrimitiveObjects.getInteger ((int) pValue);
    }
    else if (pClass == Long.class || pClass == Long.TYPE) {
      return PrimitiveObjects.getLong (pValue);
    }
    else if (pClass == Float.class || pClass == Float.TYPE) {
      return PrimitiveObjects.getFloat ((float) pValue);
    }
    else if (pClass == Double.class || pClass == Double.TYPE) {
      return PrimitiveObjects.getDouble ((double) pValue);
    }
    else {
      return PrimitiveObjects.getInteger (0);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a double to the given primitive number class
   **/
  static Number coerceToPrimitiveNumber (double pValue,
					 Class pClass)
    throws ELException
  {
    if (pClass == Byte.class || pClass == Byte.TYPE) {
      return PrimitiveObjects.getByte ((byte) pValue);
    }
    else if (pClass == Short.class || pClass == Short.TYPE) {
      return PrimitiveObjects.getShort ((short) pValue);
    }
    else if (pClass == Integer.class || pClass == Integer.TYPE) {
      return PrimitiveObjects.getInteger ((int) pValue);
    }
    else if (pClass == Long.class || pClass == Long.TYPE) {
      return PrimitiveObjects.getLong ((long) pValue);
    }
    else if (pClass == Float.class || pClass == Float.TYPE) {
      return PrimitiveObjects.getFloat ((float) pValue);
    }
    else if (pClass == Double.class || pClass == Double.TYPE) {
      return PrimitiveObjects.getDouble (pValue);
    }
    else {
      return PrimitiveObjects.getInteger (0);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a Number to the given primitive number class
   **/
  static Number coerceToPrimitiveNumber (Number pValue,
					 Class pClass)
    throws ELException
  {
    if (pClass == Byte.class || pClass == Byte.TYPE) {
      return PrimitiveObjects.getByte (pValue.byteValue ());
    }
    else if (pClass == Short.class || pClass == Short.TYPE) {
      return PrimitiveObjects.getShort (pValue.shortValue ());
    }
    else if (pClass == Integer.class || pClass == Integer.TYPE) {
      return PrimitiveObjects.getInteger (pValue.intValue ());
    }
    else if (pClass == Long.class || pClass == Long.TYPE) {
      return PrimitiveObjects.getLong (pValue.longValue ());
    }
    else if (pClass == Float.class || pClass == Float.TYPE) {
      return PrimitiveObjects.getFloat (pValue.floatValue ());
    }
    else if (pClass == Double.class || pClass == Double.TYPE) {
      return PrimitiveObjects.getDouble (pValue.doubleValue ());
    }
    else if (pClass == BigInteger.class) {
        if (pValue instanceof BigDecimal)
            return ((BigDecimal) pValue).toBigInteger();
        else
            return BigInteger.valueOf(pValue.longValue());
    }
    else if (pClass == BigDecimal.class) {
        if (pValue instanceof BigInteger)
            return new BigDecimal((BigInteger) pValue);
        else
            return new BigDecimal(pValue.doubleValue());
    }
    else {
      return PrimitiveObjects.getInteger (0);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a String to the given primitive number class
   **/
  static Number coerceToPrimitiveNumber (String pValue,
					 Class pClass)
    throws ELException
  {
    if (pClass == Byte.class || pClass == Byte.TYPE) {
      return Byte.valueOf (pValue);
    }
    else if (pClass == Short.class || pClass == Short.TYPE) {
      return Short.valueOf (pValue);
    }
    else if (pClass == Integer.class || pClass == Integer.TYPE) {
      return Integer.valueOf (pValue);
    }
    else if (pClass == Long.class || pClass == Long.TYPE) {
      return Long.valueOf (pValue);
    }
    else if (pClass == Float.class || pClass == Float.TYPE) {
      return Float.valueOf (pValue);
    }
    else if (pClass == Double.class || pClass == Double.TYPE) {
      return Double.valueOf (pValue);
    }
    else if (pClass == BigInteger.class) {
        return new BigInteger(pValue);
    }
    else if (pClass == BigDecimal.class) {
        return new BigDecimal(pValue);
    }
    else {
      return PrimitiveObjects.getInteger (0);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a value to a Character
   **/
  public static Character coerceToCharacter (Object pValue,
					     Logger pLogger)
    throws ELException
  {
    if (pValue == null ||
	"".equals (pValue)) {
      return PrimitiveObjects.getCharacter ((char) 0);
    }
    else if (pValue instanceof Character) {
      return (Character) pValue;
    }
    else if (pValue instanceof Boolean) {
      if (pLogger.isLoggingError ()) {
	pLogger.logError (Constants.BOOLEAN_TO_CHARACTER, pValue);
      }
      return PrimitiveObjects.getCharacter ((char) 0);
    }
    else if (pValue instanceof Number) {
      return PrimitiveObjects.getCharacter 
	((char) ((Number) pValue).shortValue ());
    }
    else if (pValue instanceof String) {
      String str = (String) pValue;
      return PrimitiveObjects.getCharacter (str.charAt (0));
    }
    else {
      if (pLogger.isLoggingError ()) {
	pLogger.logError
	  (Constants.COERCE_TO_CHARACTER,
	   pValue.getClass ().getName ());
      }
      return PrimitiveObjects.getCharacter ((char) 0);
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a value to a Boolean
   **/
  public static Boolean coerceToBoolean (Object pValue,
					 Logger pLogger)
    throws ELException
  {
    if (pValue == null ||
	"".equals (pValue)) {
      return Boolean.FALSE;
    }
    else if (pValue instanceof Boolean) {
      return (Boolean) pValue;
    }
    else if (pValue instanceof String) {
      String str = (String) pValue;
      try {
	return Boolean.valueOf (str);
      }
      catch (Exception exc) {
	if (pLogger.isLoggingError ()) {
	  pLogger.logError
	    (Constants.STRING_TO_BOOLEAN,
	     exc,
	     (String) pValue);
	}
	return Boolean.FALSE;
      }
    }
    else {
      if (pLogger.isLoggingError ()) {
	pLogger.logError
	  (Constants.COERCE_TO_BOOLEAN,
	   pValue.getClass ().getName ());
      }
      return Boolean.TRUE;
    }
  }

  //-------------------------------------
  /**
   *
   * Coerces a value to the specified Class that is not covered by any
   * of the above cases
   **/
  public static Object coerceToObject (Object pValue,
				       Class pClass,
				       Logger pLogger)
    throws ELException
  {
    if (pValue == null) {
      return null;
    }
    else if (pClass.isAssignableFrom (pValue.getClass ())) {
      return pValue;
    }
    else if (pValue instanceof String) {
      String str = (String) pValue;
      PropertyEditor pe = PropertyEditorManager.findEditor (pClass);
      if (pe == null) {
	if ("".equals (str)) {
	  return null;
	}
	else {
	  if (pLogger.isLoggingError ()) {
	    pLogger.logError
	      (Constants.NO_PROPERTY_EDITOR,
	       str,
	       pClass.getName ());
	  }
	  return null;
	}
      }
      try {
	pe.setAsText (str);
	return pe.getValue ();
      }
      catch (IllegalArgumentException exc) {
	if ("".equals (str)) {
	  return null;
	}
	else {
	  if (pLogger.isLoggingError ()) {
	    pLogger.logError
	      (Constants.PROPERTY_EDITOR_ERROR,
	       exc,
	       pValue,
	       pClass.getName ());
	  }
	  return null;
	}
      }
    }
    else {
      if (pLogger.isLoggingError ()) {
	pLogger.logError
	  (Constants.COERCE_TO_OBJECT,
	   pValue.getClass ().getName (),
	   pClass.getName ());
      }