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//--------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//--------------------------------------------------------------------------
package org.apache.ibatis.ognl;
import java.lang.reflect.Array;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Enumeration;
/**
* This is an abstract class with static methods that define the operations of OGNL.
*
* @author Luke Blanshard ([email protected])
* @author Drew Davidson ([email protected])
*/
public abstract class OgnlOps implements NumericTypes {
/**
* Compares two objects for equality, even if it has to convert
* one of them to the other type. If both objects are numeric
* they are converted to the widest type and compared. If
* one is non-numeric and one is numeric the non-numeric is
* converted to double and compared to the double numeric
* value. If both are non-numeric and Comparable and the
* types are compatible (i.e. v1 is of the same or superclass
* of v2's type) they are compared with Comparable.compareTo().
* If both values are non-numeric and not Comparable or of
* incompatible classes this will throw and IllegalArgumentException.
*
* @param v1 First value to compare
* @param v2 second value to compare
* @return integer describing the comparison between the two objects.
* A negative number indicates that v1 < v2. Positive indicates
* that v1 > v2. Zero indicates v1 == v2.
* @throws IllegalArgumentException if the objects are both non-numeric
* yet of incompatible types or do not implement Comparable.
*/
public static int compareWithConversion(Object v1, Object v2) {
return compareWithConversion(v1, v2, false);
}
/**
* Compares two objects for equality, even if it has to convert
* one of them to the other type. If both objects are numeric
* they are converted to the widest type and compared. If
* one is non-numeric and one is numeric the non-numeric is
* converted to double and compared to the double numeric
* value. If both are non-numeric and Comparable and the
* types are compatible (i.e. v1 is of the same or superclass
* of v2's type) they are compared with Comparable.compareTo().
* If both values are non-numeric and not Comparable or of
* incompatible classes this will throw and IllegalArgumentException.
*
* @param v1 First value to compare
* @param v2 second value to compare
* @return integer describing the comparison between the two objects.
* A negative number indicates that v1 < v2. Positive indicates
* that v1 > v2. Zero indicates v1 == v2.
* @throws IllegalArgumentException if the objects are both non-numeric
* yet of incompatible types or do not implement Comparable.
*/
public static int compareWithConversion(Object v1, Object v2, boolean equals) {
int result;
if (v1 == v2) {
result = 0;
} else {
int t1 = getNumericType(v1),
t2 = getNumericType(v2),
type = getNumericType(t1, t2, true);
switch (type) {
case BIGINT:
result = bigIntValue(v1).compareTo(bigIntValue(v2));
break;
case BIGDEC:
result = bigDecValue(v1).compareTo(bigDecValue(v2));
break;
case NONNUMERIC:
if ((t1 == NONNUMERIC) && (t2 == NONNUMERIC)) {
if ((v1 == null) || (v2 == null)) {
result = (v1 == v2) ? 0 : 1;
} else {
if (v1.getClass().isAssignableFrom(v2.getClass()) || v2.getClass().isAssignableFrom(v1.getClass())) {
if (v1 instanceof Comparable) {
result = ((Comparable) v1).compareTo(v2);
break;
} else {
if (equals) {
result = v1.equals(v2) ? 0 : 1;
break;
}
}
}
if (equals) {
// Equals comparison between non-numerics that are not of a common
// superclass return not equal
result = 1;
break;
} else {
throw new IllegalArgumentException("invalid comparison: " + v1.getClass().getName() + " and " + v2.getClass().getName());
}
}
}
// else fall through
case FLOAT:
case DOUBLE:
double dv1 = doubleValue(v1),
dv2 = doubleValue(v2);
return (dv1 == dv2) ? 0 : ((dv1 < dv2) ? -1 : 1);
default:
long lv1 = longValue(v1),
lv2 = longValue(v2);
return (lv1 == lv2) ? 0 : ((lv1 < lv2) ? -1 : 1);
}
}
return result;
}
/**
* Returns true if object1 is equal to object2 in either the
* sense that they are the same object or, if both are non-null
* if they are equal in the equals() sense.
*
* @param v1 First object to compare
* @param v2 Second object to compare
* @return true if v1 == v2
*/
public static boolean isEqual(Object object1, Object object2) {
boolean result = false;
if (object1 == object2) {
result = true;
} else {
if ((object1 != null) && (object2 != null)) {
if (object1.getClass().isArray() && object2.getClass().isArray() && (object2.getClass() == object1.getClass())) {
result = (Array.getLength(object1) == Array.getLength(object2));
if (result) {
for (int i = 0, icount = Array.getLength(object1); result && (i < icount); i++) {
result = isEqual(Array.get(object1, i), Array.get(object2, i));
}
}
} else {
if ((object1 != null) && (object2 != null)) {
// Check for converted equivalence first, then equals() equivalence
result = (compareWithConversion(object1, object2, true) == 0) || object1.equals(object2);
}
}
}
}
return result;
}
/**
* Evaluates the given object as a boolean: if it is a Boolean object, it's easy; if
* it's a Number or a Character, returns true for non-zero objects; and otherwise
* returns true for non-null objects.
*
* @param value an object to interpret as a boolean
* @return the boolean value implied by the given object
*/
public static boolean booleanValue(Object value) {
if (value == null)
return false;
Class c = value.getClass();
if (c == Boolean.class)
return ((Boolean) value).booleanValue();
// if ( c == String.class )
// return ((String)value).length() > 0;
if (c == Character.class)
return ((Character) value).charValue() != 0;
if (value instanceof Number)
return ((Number) value).doubleValue() != 0;
return true; // non-null
}
/**
* Evaluates the given object as a long integer.
*
* @param value an object to interpret as a long integer
* @return the long integer value implied by the given object
* @throws NumberFormatException if the given object can't be understood as a long integer
*/
public static long longValue(Object value) throws NumberFormatException {
if (value == null)
return 0L;
Class c = value.getClass();
if (c.getSuperclass() == Number.class)
return ((Number) value).longValue();
if (c == Boolean.class)
return ((Boolean) value).booleanValue() ? 1 : 0;
if (c == Character.class)
return ((Character) value).charValue();
return Long.parseLong(stringValue(value, true));
}
/**
* Evaluates the given object as a double-precision floating-point number.
*
* @param value an object to interpret as a double
* @return the double value implied by the given object
* @throws NumberFormatException if the given object can't be understood as a double
*/
public static double doubleValue(Object value) throws NumberFormatException {
if (value == null)
return 0.0;
Class c = value.getClass();
if (c.getSuperclass() == Number.class)
return ((Number) value).doubleValue();
if (c == Boolean.class)
return ((Boolean) value).booleanValue() ? 1 : 0;
if (c == Character.class)
return ((Character) value).charValue();
String s = stringValue(value, true);
return (s.length() == 0) ? 0.0 : Double.parseDouble(s);
/*
For 1.1 parseDouble() is not available
*/
//return Double.valueOf( value.toString() ).doubleValue();
}
/**
* Evaluates the given object as a BigInteger.
*
* @param value an object to interpret as a BigInteger
* @return the BigInteger value implied by the given object
* @throws NumberFormatException if the given object can't be understood as a BigInteger
*/
public static BigInteger bigIntValue(Object value) throws NumberFormatException {
if (value == null)
return BigInteger.valueOf(0L);
Class c = value.getClass();
if (c == BigInteger.class)
return (BigInteger) value;
if (c == BigDecimal.class)
return ((BigDecimal) value).toBigInteger();
if (c.getSuperclass() == Number.class)
return BigInteger.valueOf(((Number) value).longValue());
if (c == Boolean.class)
return BigInteger.valueOf(((Boolean) value).booleanValue() ? 1 : 0);
if (c == Character.class)
return BigInteger.valueOf(((Character) value).charValue());
return new BigInteger(stringValue(value, true));
}
/**
* Evaluates the given object as a BigDecimal.
*
* @param value an object to interpret as a BigDecimal
* @return the BigDecimal value implied by the given object
* @throws NumberFormatException if the given object can't be understood as a BigDecimal
*/
public static BigDecimal bigDecValue(Object value) throws NumberFormatException {
if (value == null)
return BigDecimal.valueOf(0L);
Class c = value.getClass();
if (c == BigDecimal.class)
return (BigDecimal) value;
if (c == BigInteger.class)
return new BigDecimal((BigInteger) value);
if (c.getSuperclass() == Number.class)
return new BigDecimal(((Number) value).doubleValue());
if (c == Boolean.class)
return BigDecimal.valueOf(((Boolean) value).booleanValue() ? 1 : 0);
if (c == Character.class)
return BigDecimal.valueOf(((Character) value).charValue());
return new BigDecimal(stringValue(value, true));
}
/**
* Evaluates the given object as a String and trims it if the trim flag is true.
*
* @param value an object to interpret as a String
* @return the String value implied by the given object as returned by the toString() method,
* or "null" if the object is null.
*/
public static String stringValue(Object value, boolean trim) {
String result;
if (value == null) {
result = OgnlRuntime.NULL_STRING;
} else {
result = value.toString();
if (trim) {
result = result.trim();
}
}
return result;
}
/**
* Evaluates the given object as a String.
*
* @param value an object to interpret as a String
* @return the String value implied by the given object as returned by the toString() method,
* or "null" if the object is null.
*/
public static String stringValue(Object value) {
return stringValue(value, false);
}
/**
* Returns a constant from the NumericTypes interface that represents the numeric
* type of the given object.
*
* @param value an object that needs to be interpreted as a number
* @return the appropriate constant from the NumericTypes interface
*/
public static int getNumericType(Object value) {
int result = NONNUMERIC;
if (value != null) {
Class c = value.getClass();
if (c == Integer.class) return INT;
if (c == Double.class) return DOUBLE;
if (c == Boolean.class) return BOOL;
if (c == Byte.class) return BYTE;
if (c == Character.class) return CHAR;
if (c == Short.class) return SHORT;
if (c == Long.class) return LONG;
if (c == Float.class) return FLOAT;
if (c == BigInteger.class) return BIGINT;
if (c == BigDecimal.class) return BIGDEC;
}
return NONNUMERIC;
}
/**
* Returns the value converted numerically to the given class type
*
* This method also detects when arrays are being converted and
* converts the components of one array to the type of the other.
*
* @param value an object to be converted to the given type
* @param toType class type to be converted to
* @return converted value of the type given, or value if the value
* cannot be converted to the given type.
*/
public static Object convertValue(Object value, Class toType) {
Object result = null;
if (value != null) {
/* If array -> array then convert components of array individually */
if (value.getClass().isArray() && toType.isArray()) {
Class componentType = toType.getComponentType();
result = Array.newInstance(componentType, Array.getLength(value));
for (int i = 0, icount = Array.getLength(value); i < icount; i++) {
Array.set(result, i, convertValue(Array.get(value, i), componentType));
}
} else {
if ((toType == Integer.class) || (toType == Integer.TYPE)) result = new Integer((int) longValue(value));
if ((toType == Double.class) || (toType == Double.TYPE)) result = new Double(doubleValue(value));
if ((toType == Boolean.class) || (toType == Boolean.TYPE))
result = booleanValue(value) ? Boolean.TRUE : Boolean.FALSE;
if ((toType == Byte.class) || (toType == Byte.TYPE)) result = new Byte((byte) longValue(value));
if ((toType == Character.class) || (toType == Character.TYPE)) result = new Character((char) longValue(value));
if ((toType == Short.class) || (toType == Short.TYPE)) result = new Short((short) longValue(value));
if ((toType == Long.class) || (toType == Long.TYPE)) result = new Long(longValue(value));
if ((toType == Float.class) || (toType == Float.TYPE)) result = new Float(doubleValue(value));
if (toType == BigInteger.class) result = bigIntValue(value);
if (toType == BigDecimal.class) result = bigDecValue(value);
if (toType == String.class) result = stringValue(value);
}
} else {
if (toType.isPrimitive()) {
result = OgnlRuntime.getPrimitiveDefaultValue(toType);
}
}
return result;
}
/**
* Returns the constant from the NumericTypes interface that best expresses the type
* of a numeric operation on the two given objects.
*
* @param v1 one argument to a numeric operator
* @param v2 the other argument
* @return the appropriate constant from the NumericTypes interface
*/
public static int getNumericType(Object v1, Object v2) {
return getNumericType(v1, v2, false);
}
/**
* Returns the constant from the NumericTypes interface that best expresses the type
* of an operation, which can be either numeric or not, on the two given types.
*
* @param t1 type of one argument to an operator
* @param t2 type of the other argument
* @param canBeNonNumeric whether the operator can be interpreted as non-numeric
* @return the appropriate constant from the NumericTypes interface
*/
public static int getNumericType(int t1, int t2, boolean canBeNonNumeric) {
if (t1 == t2)
return t1;
if (canBeNonNumeric && (t1 == NONNUMERIC || t2 == NONNUMERIC || t1 == CHAR || t2 == CHAR))
return NONNUMERIC;
if (t1 == NONNUMERIC) t1 = DOUBLE; // Try to interpret strings as doubles...
if (t2 == NONNUMERIC) t2 = DOUBLE; // Try to interpret strings as doubles...
if (t1 >= MIN_REAL_TYPE) {
if (t2 >= MIN_REAL_TYPE)
return Math.max(t1, t2);
if (t2 < INT)
return t1;
if (t2 == BIGINT)
return BIGDEC;
return Math.max(DOUBLE, t1);
} else if (t2 >= MIN_REAL_TYPE) {
if (t1 < INT)
return t2;
if (t1 == BIGINT)
return BIGDEC;
return Math.max(DOUBLE, t2);
} else
return Math.max(t1, t2);
}
/**
* Returns the constant from the NumericTypes interface that best expresses the type
* of an operation, which can be either numeric or not, on the two given objects.
*
* @param v1 one argument to an operator
* @param v2 the other argument
* @param canBeNonNumeric whether the operator can be interpreted as non-numeric
* @return the appropriate constant from the NumericTypes interface
*/
public static int getNumericType(Object v1, Object v2, boolean canBeNonNumeric) {
return getNumericType(getNumericType(v1), getNumericType(v2), canBeNonNumeric);
}
/**
* Returns a new Number object of an appropriate type to hold the given integer
* value. The type of the returned object is consistent with the given type
* argument, which is a constant from the NumericTypes interface.
*
* @param type the nominal numeric type of the result, a constant from the NumericTypes interface
* @param value the integer value to convert to a Number object
* @return a Number object with the given value, of type implied by the type argument
*/
public static Number newInteger(int type, long value) {
switch (type) {
case BOOL:
case CHAR:
case INT:
return new Integer((int) value);
case FLOAT:
if ((long) (float) value == value) {
return new Float((float) value);
}
// else fall through:
case DOUBLE:
if ((long) (double) value == value) {
return new Double((double) value);
}
// else fall through:
case LONG:
return new Long(value);
case BYTE:
return new Byte((byte) value);
case SHORT:
return new Short((short) value);
default:
return BigInteger.valueOf(value);
}
}
/**
* Returns a new Number object of an appropriate type to hold the given real value.
* The type of the returned object is always either Float or Double, and is only
* Float if the given type tag (a constant from the NumericTypes interface) is
* FLOAT.
*
* @param type the nominal numeric type of the result, a constant from the NumericTypes interface
* @param value the real value to convert to a Number object
* @return a Number object with the given value, of type implied by the type argument
*/
public static Number newReal(int type, double value) {
if (type == FLOAT)
return new Float((float) value);
return new Double(value);
}
public static Object binaryOr(Object v1, Object v2) {
int type = getNumericType(v1, v2);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).or(bigIntValue(v2));
return newInteger(type, longValue(v1) | longValue(v2));
}
public static Object binaryXor(Object v1, Object v2) {
int type = getNumericType(v1, v2);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).xor(bigIntValue(v2));
return newInteger(type, longValue(v1) ^ longValue(v2));
}
public static Object binaryAnd(Object v1, Object v2) {
int type = getNumericType(v1, v2);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).and(bigIntValue(v2));
return newInteger(type, longValue(v1) & longValue(v2));
}
public static boolean equal(Object v1, Object v2) {
if (v1 == null)
return v2 == null;
if (v1 == v2 || isEqual(v1, v2))
return true;
if (v1 instanceof Number && v2 instanceof Number)
return ((Number) v1).doubleValue() == ((Number) v2).doubleValue();
return false;
}
public static boolean less(Object v1, Object v2) {
return compareWithConversion(v1, v2) < 0;
}
public static boolean greater(Object v1, Object v2) {
return compareWithConversion(v1, v2) > 0;
}
public static boolean in(Object v1, Object v2) throws OgnlException {
if (v2 == null) // A null collection is always treated as empty
return false;
ElementsAccessor elementsAccessor = OgnlRuntime.getElementsAccessor(OgnlRuntime.getTargetClass(v2));
for (Enumeration e = elementsAccessor.getElements(v2); e.hasMoreElements();) {
Object o = e.nextElement();
if (equal(v1, o))
return true;
}
return false;
}
public static Object shiftLeft(Object v1, Object v2) {
int type = getNumericType(v1);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).shiftLeft((int) longValue(v2));
return newInteger(type, longValue(v1) << (int) longValue(v2));
}
public static Object shiftRight(Object v1, Object v2) {
int type = getNumericType(v1);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).shiftRight((int) longValue(v2));
return newInteger(type, longValue(v1) >> (int) longValue(v2));
}
public static Object unsignedShiftRight(Object v1, Object v2) {
int type = getNumericType(v1);
if (type == BIGINT || type == BIGDEC)
return bigIntValue(v1).shiftRight((int) longValue(v2));
if (type <= INT)
return newInteger(INT, ((int) longValue(v1)) >>> (int) longValue(v2));
return newInteger(type, longValue(v1) >>> (int) longValue(v2));
}
public static Object add(Object v1, Object v2) {
int type = getNumericType(v1, v2, true);
switch (type) {
case BIGINT:
return bigIntValue(v1).add(bigIntValue(v2));
case BIGDEC:
return bigDecValue(v1).add(bigDecValue(v2));
case FLOAT:
case DOUBLE:
return newReal(type, doubleValue(v1) + doubleValue(v2));
case NONNUMERIC:
int t1 = getNumericType(v1),
t2 = getNumericType(v2);
if (((t1 != NONNUMERIC) && (v2 == null)) || ((t2 != NONNUMERIC) && (v1 == null))) {
throw new NullPointerException();
}
return stringValue(v1) + stringValue(v2);
default:
return newInteger(type, longValue(v1) + longValue(v2));
}
}
public static Object subtract(Object v1, Object v2) {
int type = getNumericType(v1, v2);
switch (type) {
case BIGINT:
return bigIntValue(v1).subtract(bigIntValue(v2));
case BIGDEC:
return bigDecValue(v1).subtract(bigDecValue(v2));
case FLOAT:
case DOUBLE:
return newReal(type, doubleValue(v1) - doubleValue(v2));
default:
return newInteger(type, longValue(v1) - longValue(v2));
}
}
public static Object multiply(Object v1, Object v2) {
int type = getNumericType(v1, v2);
switch (type) {
case BIGINT:
return bigIntValue(v1).multiply(bigIntValue(v2));
case BIGDEC:
return bigDecValue(v1).multiply(bigDecValue(v2));
case FLOAT:
case DOUBLE:
return newReal(type, doubleValue(v1) * doubleValue(v2));
default:
return newInteger(type, longValue(v1) * longValue(v2));
}
}
public static Object divide(Object v1, Object v2) {
int type = getNumericType(v1, v2);
switch (type) {
case BIGINT:
return bigIntValue(v1).divide(bigIntValue(v2));
case BIGDEC:
return bigDecValue(v1).divide(bigDecValue(v2), BigDecimal.ROUND_HALF_EVEN);
case FLOAT:
case DOUBLE:
return newReal(type, doubleValue(v1) / doubleValue(v2));
default:
return newInteger(type, longValue(v1) / longValue(v2));
}
}
public static Object remainder(Object v1, Object v2) {
int type = getNumericType(v1, v2);
switch (type) {
case BIGDEC:
case BIGINT:
return bigIntValue(v1).remainder(bigIntValue(v2));
default:
return newInteger(type, longValue(v1) % longValue(v2));
}
}
public static Object negate(Object value) {
int type = getNumericType(value);
switch (type) {
case BIGINT:
return bigIntValue(value).negate();
case BIGDEC:
return bigDecValue(value).negate();
case FLOAT:
case DOUBLE:
return newReal(type, -doubleValue(value));
default:
return newInteger(type, -longValue(value));
}
}
public static Object bitNegate(Object value) {
int type = getNumericType(value);
switch (type) {
case BIGDEC:
case BIGINT:
return bigIntValue(value).not();
default:
return newInteger(type, ~longValue(value));
}
}
}
