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 / BitGetFunction.java @ 43983
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1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.numeric; |
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2 | |||
3 | import org.apache.commons.lang3.Range; |
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4 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
5 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
6 | |||
7 | public class BitGetFunction extends AbstractFunction { |
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8 | |||
9 | public BitGetFunction() {
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10 | super(
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11 | "Numeric", "BITGET", Range.is(2), |
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12 | "Returns true if and only if the first parameter has a bit set "
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13 | + "in the position specified by the second parameter. "
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14 | + "This method returns a boolean. "
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15 | + "The second parameter is zero-indexed; the least significant "
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16 | + "bit has position 0",
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17 | 43983 | jjdelcerro | "BITGET({{bits}}, nbit)",
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18 | new String[]{ |
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19 | "bits - a bit set",
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20 | "nbit - bit to check"
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21 | }, |
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22 | "Boolean"
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23 | 43512 | jjdelcerro | ); |
24 | } |
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25 | |||
26 | @Override
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27 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) { |
28 | 43512 | jjdelcerro | Object value = args[0]; |
29 | |||
30 | int bit = getInt(args, 1); |
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31 | if( value instanceof Integer ) { |
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32 | int mask = 1<<bit; |
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33 | boolean r = (((Number) value).intValue() & mask) == mask; |
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34 | return r;
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35 | } |
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36 | if( value instanceof Number ) { |
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37 | int mask = 1<<bit; |
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38 | boolean r = (((Number) value).longValue() & mask) == mask; |
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39 | return r;
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40 | } |
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41 | throw new IllegalArgumentException("Types not allowed in '"+name()+"' function."); |
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42 | } |
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43 | |||
44 | |||
45 | } |