Add coalesce function
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main/src/com/google/refine/expr/functions/Coalesce.java
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72
main/src/com/google/refine/expr/functions/Coalesce.java
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@ -0,0 +1,72 @@
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/*
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Copyright 2018, Owen Stephens
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.google.refine.expr.functions;
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import java.util.Properties;
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import org.json.JSONException;
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import org.json.JSONWriter;
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import com.google.refine.expr.EvalError;
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import com.google.refine.grel.ControlFunctionRegistry;
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import com.google.refine.grel.Function;
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public class Coalesce implements Function {
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@Override
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public Object call(Properties bindings, Object[] args) {
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if (args.length> 0) {
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for (int i = 0; i < args.length; i++){
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if (args[i] == null) {
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continue;
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} else {
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return args[i];
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}
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}
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return null;
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}
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return new EvalError(ControlFunctionRegistry.getFunctionName(this) + " expects at least one argument");
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}
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@Override
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public void write(JSONWriter writer, Properties options)
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throws JSONException {
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writer.object();
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writer.key("description"); writer.value("Returns the first non-null from a series of values");
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writer.key("params"); writer.value("one or more objects");
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writer.key("returns"); writer.value("object");
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writer.endObject();
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}
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}
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@ -38,6 +38,7 @@ import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import com.google.refine.expr.functions.Coalesce;
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import com.google.refine.expr.functions.Cross;
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import com.google.refine.expr.functions.FacetCount;
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import com.google.refine.expr.functions.Get;
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@ -186,6 +187,7 @@ public class ControlFunctionRegistry {
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}
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static {
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registerFunction("coalesce", new Coalesce());
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registerFunction("type", new Type());
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registerFunction("toString", new ToString());
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@ -0,0 +1,104 @@
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/*
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Copyright 2011, Owen Stephens
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.google.refine.tests.expr.functions.strings;
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import java.util.Properties;
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import org.slf4j.LoggerFactory;
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import org.testng.Assert;
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import org.testng.annotations.AfterMethod;
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import org.testng.annotations.BeforeMethod;
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import org.testng.annotations.BeforeTest;
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import org.testng.annotations.Test;
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import com.google.refine.expr.EvalError;
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import com.google.refine.grel.ControlFunctionRegistry;
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import com.google.refine.grel.Function;
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import com.google.refine.tests.RefineTest;
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public class CoalesceTests extends RefineTest {
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static Properties bindings;
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private static final Integer[] ZERO_TO_TWO = new Integer[] {0, 1, 2};
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@Override
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@BeforeTest
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public void init() {
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logger = LoggerFactory.getLogger(this.getClass());
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}
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@BeforeMethod
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public void SetUp() {
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bindings = new Properties();
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}
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@AfterMethod
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public void TearDown() {
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bindings = null;
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}
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/**
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* Lookup a control function by name and invoke it with a variable number of args
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*/
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private static Object invoke(String name,Object... args) {
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// registry uses static initializer, so no need to set it up
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Function function = ControlFunctionRegistry.getFunction(name);
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if (function == null) {
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throw new IllegalArgumentException("Unknown function "+name);
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}
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if (args == null) {
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return function.call(bindings,new Object[0]);
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} else {
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return function.call(bindings,args);
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}
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}
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@Test
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public void testCoalesceInvalidParams() {
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Assert.assertTrue(invoke("coalesce") instanceof EvalError);
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}
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@Test
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public void testCoalesce() {
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Assert.assertNull(invoke("coalesce", (Object) null));
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Assert.assertEquals(invoke("coalesce", "string"),"string");
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Assert.assertEquals(invoke("coalesce", 1),1);
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Assert.assertEquals(invoke("coalesce", (Object) null, "string"),"string");
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Assert.assertEquals(invoke("coalesce", (Object) null, (Object) null, "string"),"string");
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Assert.assertEquals(invoke("coalesce", (Object) null, 1),1);
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Assert.assertEquals(invoke("coalesce", (Object) null, ZERO_TO_TWO),ZERO_TO_TWO);
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}
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}
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