svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / numeric / AbsFunction.java @ 43983
History | View | Annotate | Download (1.86 KB)
1 |
package org.gvsig.expressionevaluator.impl.function.numeric; |
---|---|
2 |
|
3 |
import org.apache.commons.lang3.Range; |
4 |
import org.gvsig.expressionevaluator.Interpreter; |
5 |
import org.gvsig.expressionevaluator.spi.AbstractFunction; |
6 |
|
7 |
public class AbsFunction extends AbstractFunction { |
8 |
|
9 |
public AbsFunction() {
|
10 |
super("Numeric", "ABS",Range.is(1), |
11 |
"Returns the absolute value of a double value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned. Special cases:\n" +
|
12 |
"- If the argument is positive zero or negative zero, the result is positive zero.\n" +
|
13 |
"- If the argument is infinite, the result is positive infinity.\n" +
|
14 |
"- If the argument is NaN, the result is NaN.\n" +
|
15 |
"In other words, the result is the same as the value of the expression:\n" +
|
16 |
"Double.longBitsToDouble((Double.doubleToLongBits(a)<<1)>>>1)",
|
17 |
"ABS({{a}})",
|
18 |
new String[]{ |
19 |
"a - the argument whose absolute value is to be determined"
|
20 |
}, |
21 |
"Double"
|
22 |
); |
23 |
} |
24 |
|
25 |
@Override
|
26 |
public Object call(Interpreter interpreter, Object[] args) { |
27 |
Object op1 = args[0]; |
28 |
|
29 |
if( op1 instanceof Double ) { |
30 |
double value = Math.abs(((Number) op1).doubleValue()); |
31 |
return value;
|
32 |
} |
33 |
if( op1 instanceof Float ) { |
34 |
float value = Math.abs(((Number) op1).floatValue()); |
35 |
return value;
|
36 |
} |
37 |
if( op1 instanceof Long ) { |
38 |
long value = Math.abs(((Number) op1).longValue()); |
39 |
return value;
|
40 |
} |
41 |
if( op1 instanceof Integer ) { |
42 |
int value = Math.abs(((Number) op1).intValue()); |
43 |
return value;
|
44 |
} |
45 |
throw new IllegalArgumentException("Types not allowed in '"+name()+"' function."); |
46 |
} |
47 |
|
48 |
|
49 |
} |