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PavelSakharchukPavelSakharchuk
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Defines the pattern for taking unique items from collection of JSONArray
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‎README.md‎

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@@ -85,20 +85,21 @@ Functions
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Functions can be invoked at the tail end of a path - the input to a function is the output of the path expression.
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The function output is dictated by the function itself.
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| Function | Description | Output type |
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|:----------|:-------------------------------------------------------------------------------------|:---------------------|
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| min() | Provides the min value of an array of numbers | Double |
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| max() | Provides the max value of an array of numbers | Double |
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| avg() | Provides the average value of an array of numbers | Double |
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| stddev() | Provides the standard deviation value of an array of numbers | Double |
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| length() | Provides the length of an array | Integer |
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| sum() | Provides the sum value of an array of numbers | Double |
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| keys() | Provides the property keys (An alternative for terminal tilde `~`) | `Set<E>` |
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| concat(X) | Provides a concatinated version of the path output with a new item | like input |
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| append(X) | add an item to the json path output array | like input |
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| first() | Provides the first item of an array | Depends on the array |
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| last() | Provides the last item of an array | Depends on the array |
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| index(X) | Provides the item of an array of index: X, if the X is negative, take from backwards | Depends on the array |
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| Function | Description | Output type |
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|:-----------|:-------------------------------------------------------------------------------------|:---------------------|
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| min() | Provides the min value of an array of numbers | Double |
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| max() | Provides the max value of an array of numbers | Double |
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| avg() | Provides the average value of an array of numbers | Double |
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| stddev() | Provides the standard deviation value of an array of numbers | Double |
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| length() | Provides the length of an array | Integer |
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| sum() | Provides the sum value of an array of numbers | Double |
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| keys() | Provides the property keys (An alternative for terminal tilde `~`) | `Set<E>` |
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| concat(X) | Provides a concatinated version of the path output with a new item | like input |
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| append(X) | add an item to the json path output array | like input |
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| first() | Provides the first item of an array | Depends on the array |
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| last() | Provides the last item of an array | Depends on the array |
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| index(X) | Provides the item of an array of index: X, if the X is negative, take from backwards | Depends on the array |
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| distinct() | Provides the unique items of an array | Depends on the array |
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Filter Operators
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-----------------
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‎json-path/src/main/java/com/jayway/jsonpath/internal/function/PathFunctionFactory.java‎

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import com.jayway.jsonpath.internal.function.numeric.Min;
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import com.jayway.jsonpath.internal.function.numeric.StandardDeviation;
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import com.jayway.jsonpath.internal.function.numeric.Sum;
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import com.jayway.jsonpath.internal.function.sequence.Distinct;
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import com.jayway.jsonpath.internal.function.sequence.First;
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import com.jayway.jsonpath.internal.function.sequence.Index;
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import com.jayway.jsonpath.internal.function.sequence.Last;
@@ -53,6 +54,7 @@ public class PathFunctionFactory {
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// Sequential Functions
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map.put("first", First.class);
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map.put("last", Last.class);
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map.put("distinct", Distinct.class);
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map.put("index", Index.class);
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‎json-path/src/main/java/com/jayway/jsonpath/internal/function/sequence/Distinct.java‎

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package com.jayway.jsonpath.internal.function.sequence;
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import com.jayway.jsonpath.JsonPathException;
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import com.jayway.jsonpath.internal.EvaluationContext;
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import com.jayway.jsonpath.internal.PathRef;
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import com.jayway.jsonpath.internal.function.Parameter;
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import com.jayway.jsonpath.internal.function.PathFunction;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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/**
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* Take the unique items from collection of JSONArray
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*
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* Created by PavelSakharchuk on 21/09/23
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*/
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public class Distinct implements PathFunction {
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@Override
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public Object invoke(String currentPath, PathRef parent, Object model, EvaluationContext ctx, List<Parameter> parameters) {
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if(ctx.configuration().jsonProvider().isArray(model)){
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Iterable<?> objects = ctx.configuration().jsonProvider().toIterable(model);
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Set<Object> objectSet = new HashSet<>();
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objects.forEach(objectSet::add);
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return new ArrayList<>(objectSet);
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}
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throw new JsonPathException("Aggregation function attempted to calculate value using empty array");
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}
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}

‎json-path/src/test/java/com/jayway/jsonpath/internal/function/BaseFunctionTest.java‎

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*/
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public class BaseFunctionTest {
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protected static final String NUMBER_SERIES = "{\"empty\": [], \"numbers\" : [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]}";
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protected static final String TEXT_SERIES = "{\"urls\": [\"http://api.worldbank.org/countries/all/?format=json\", \"http://api.worldbank.org/countries/all/?format=json\"], \"text\" : [ \"a\", \"b\", \"c\", \"d\", \"e\", \"f\" ]}";
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protected static final String TEXT_SERIES = "{\"urls\": [\"http://api.worldbank.org/countries/all/?format=json\", \"http://api.worldbank.org/countries/all/?format=json\"], \"text\" : [ \"a\", \"b\", \"c\", \"d\", \"d\", \"e\", \"f\" ]}";
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protected static final String TEXT_AND_NUMBER_SERIES = "{\"text\" : [ \"a\", \"b\", \"c\", \"d\", \"e\", \"f\" ], \"numbers\" : [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]}";
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/**

‎json-path/src/test/java/com/jayway/jsonpath/internal/function/SequentialPathFunctionTest.java‎

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import com.jayway.jsonpath.Configuration;
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import com.jayway.jsonpath.Configurations;
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import java.util.Arrays;
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import org.junit.Test;
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/**
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* -first
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* -last
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* -index(X)
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* -distinct
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*
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* Created by git9527 on 6/11/22.
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*/
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verifyFunction(conf, "$.text.index(-1)", TEXT_SERIES, "f");
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verifyFunction(conf, "$.text.index(1)", TEXT_SERIES, "b");
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}
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@Test
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public void testDistinctOfText() throws Exception {
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verifyFunction(conf, "$.text.distinct()", TEXT_SERIES, Arrays.asList("a", "b", "c", "d", "e", "f"));
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}
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}

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