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Abs function now available in GREL

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git-svn-id: http://google-refine.googlecode.com/svn/trunk@1890 7d457c2a-affb-35e4-300a-418c747d4874
This commit is contained in:
Iain Sproat 2010-11-17 09:38:51 +00:00
parent acbed0c1ba
commit dd333d5b43
2 changed files with 65 additions and 0 deletions
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63
main/src/com/google/refine/expr/functions/math/Abs.java Normal file
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@ -0,0 +1,63 @@
/*
Copyright 2010, Google Inc.
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 Google Inc. 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 com.google.refine.expr.functions.math;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONWriter;
import com.google.refine.expr.EvalError;
import com.google.refine.grel.ControlFunctionRegistry;
import com.google.refine.grel.Function;
public class Abs implements Function {
public Object call(Properties bindings, Object[] args) {
if (args.length == 1 && args[0] != null && args[0] instanceof Number) {
return Math.abs(((Number) args[0]).doubleValue());
}
return new EvalError(ControlFunctionRegistry.getFunctionName(this) + " expects a number");
}
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("description"); writer.value("Returns the absolute value of a number");
writer.key("params"); writer.value("number d");
writer.key("returns"); writer.value("number");
writer.endObject();
}
}

2
main/src/com/google/refine/grel/ControlFunctionRegistry.java
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@ -59,6 +59,7 @@ import com.google.refine.expr.functions.booleans.Or;
import com.google.refine.expr.functions.date.DatePart;
import com.google.refine.expr.functions.date.Inc;
import com.google.refine.expr.functions.date.Now;
import com.google.refine.expr.functions.math.Abs;
import com.google.refine.expr.functions.math.Ceil;
import com.google.refine.expr.functions.math.Exp;
import com.google.refine.expr.functions.math.Floor;
@ -214,6 +215,7 @@ public class ControlFunctionRegistry {
registerFunction("round", new Round());
registerFunction("floor", new Floor());
registerFunction("ceil", new Ceil());
registerFunction("abs", new Abs());
registerFunction("mod", new Mod());
registerFunction("max", new Max());
registerFunction("min", new Min());