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Merge pull request eugenp#6615 from josephine-barboza/master
BAEL-2766 Maps in Groovy
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‎core-groovy-collections/README.md‎

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# Groovy
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## Relevant articles:
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- [Maps in Groovy](http://www.baeldung.com/)
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‎core-groovy-collections/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-groovy-collections</artifactId>
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<version>1.0-SNAPSHOT</version>
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<name>core-groovy-collections</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.codehaus.groovy</groupId>
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<artifactId>groovy</artifactId>
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<version>${groovy.version}</version>
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</dependency>
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<dependency>
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<groupId>org.codehaus.groovy</groupId>
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<artifactId>groovy-all</artifactId>
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<version>${groovy-all.version}</version>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>org.codehaus.groovy</groupId>
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<artifactId>groovy-dateutil</artifactId>
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<version>${groovy.version}</version>
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</dependency>
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<dependency>
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<groupId>org.codehaus.groovy</groupId>
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<artifactId>groovy-sql</artifactId>
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<version>${groovy-sql.version}</version>
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</dependency>
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<dependency>
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<groupId>org.junit.platform</groupId>
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<artifactId>junit-platform-runner</artifactId>
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<version>${junit.platform.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hsqldb</groupId>
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<artifactId>hsqldb</artifactId>
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<version>${hsqldb.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.spockframework</groupId>
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<artifactId>spock-core</artifactId>
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<version>${spock-core.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.codehaus.gmavenplus</groupId>
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<artifactId>gmavenplus-plugin</artifactId>
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<version>${gmavenplus-plugin.version}</version>
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<executions>
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<execution>
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<goals>
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<goal>addSources</goal>
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<goal>addTestSources</goal>
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<goal>compile</goal>
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<goal>compileTests</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<artifactId>maven-failsafe-plugin</artifactId>
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<version>${maven-failsafe-plugin.version}</version>
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<dependencies>
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<dependency>
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<groupId>org.junit.platform</groupId>
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<artifactId>junit-platform-surefire-provider</artifactId>
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<version>${junit.platform.version}</version>
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</dependency>
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</dependencies>
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<executions>
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<execution>
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<id>junit5</id>
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<goals>
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<goal>integration-test</goal>
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<goal>verify</goal>
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</goals>
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<configuration>
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<includes>
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<include>**/*Test5.java</include>
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</includes>
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</configuration>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.20.1</version>
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<configuration>
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<useFile>false</useFile>
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<includes>
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<include>**/*Test.java</include>
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<include>**/*Spec.java</include>
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</includes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<repositories>
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<repository>
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<id>central</id>
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<url>http://jcenter.bintray.com</url>
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</repository>
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</repositories>
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<properties>
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<junit.platform.version>1.0.0</junit.platform.version>
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<groovy.version>2.5.6</groovy.version>
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<groovy-all.version>2.5.6</groovy-all.version>
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<groovy-sql.version>2.5.6</groovy-sql.version>
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<hsqldb.version>2.4.0</hsqldb.version>
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<spock-core.version>1.1-groovy-2.4</spock-core.version>
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<gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
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</properties>
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</project>
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‎core-groovy-collections/src/test/groovy/com/baeldung/map/MapTest.groovy‎

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package com.baeldung.map;
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import static groovy.test.GroovyAssert.*
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import org.junit.Test
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class MapTest{
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@Test
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void createMap() {
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def emptyMap = [:]
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assertNotNull(emptyMap)
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assertTrue(emptyMap instanceof java.util.LinkedHashMap)
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def map = [name:"Jerry", age: 42, city: "New York"]
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assertTrue(map.size() == 3)
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}
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@Test
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void addItemsToMap() {
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def map = [name:"Jerry"]
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map["age"] = 42
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map.city = "New York"
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def hobbyLiteral = "hobby"
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def hobbyMap = [(hobbyLiteral): "Singing"]
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map.putAll(hobbyMap)
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assertTrue(map == [name:"Jerry", age: 42, city: "New York", hobby:"Singing"])
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assertTrue(hobbyMap.hobby == "Singing")
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assertTrue(hobbyMap[hobbyLiteral] == "Singing")
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map.plus([1:20]) // returns new map
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map << [2:30]
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}
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@Test
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void getItemsFromMap() {
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def map = [name:"Jerry", age: 42, city: "New York", hobby:"Singing"]
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assertTrue(map["name"] == "Jerry")
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assertTrue(map.name == "Jerry")
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def propertyAge = "age"
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assertTrue(map[propertyAge] == 42)
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}
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@Test
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void removeItemsFromMap() {
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def map = [1:20, a:30, 2:42, 4:34, ba:67, 6:39, 7:49]
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def minusMap = map.minus([2:42, 4:34]);
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assertTrue(minusMap == [1:20, a:30, ba:67, 6:39, 7:49])
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minusMap.removeAll{it -> it.key instanceof String}
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assertTrue( minusMap == [ 1:20, 6:39, 7:49])
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minusMap.retainAll{it -> it.value %2 == 0}
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assertTrue( minusMap == [1:20])
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}
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@Test
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void iteratingOnMaps(){
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def map = [name:"Jerry", age: 42, city: "New York", hobby:"Singing"]
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map.each{ entry -> println "$entry.key: $entry.value" }
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map.eachWithIndex{ entry, i -> println "$i $entry.key: $entry.value" }
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map.eachWithIndex{ key, value, i -> println "$i $key: $value" }
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}
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@Test
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void filteringAndSearchingMaps(){
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def map = [name:"Jerry", age: 42, city: "New York", hobby:"Singing"]
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assertTrue(map.find{ it.value == "New York"}.key == "city")
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assertTrue(map.findAll{ it.value == "New York"} == [city : "New York"])
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map.grep{it.value == "New York"}.each{ it -> assertTrue(it.key == "city" && it.value == "New York")}
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assertTrue(map.every{it -> it.value instanceof String} == false)
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assertTrue(map.any{it -> it.value instanceof String} == true)
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}
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@Test
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void collect(){
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def map = [1: [name:"Jerry", age: 42, city: "New York"],
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2: [name:"Long", age: 25, city: "New York"],
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3: [name:"Dustin", age: 29, city: "New York"],
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4: [name:"Dustin", age: 34, city: "New York"]]
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def names = map.collect{entry -> entry.value.name} // returns only list
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assertTrue(names == ["Jerry", "Long", "Dustin", "Dustin"])
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def uniqueNames = map.collect([] as HashSet){entry -> entry.value.name}
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assertTrue(uniqueNames == ["Jerry", "Long", "Dustin"] as Set)
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def idNames = map.collectEntries{key, value -> [key, value.name]}
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assertTrue(idNames == [1:"Jerry", 2: "Long", 3:"Dustin", 4: "Dustin"])
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def below30Names = map.findAll{it.value.age < 30}.collect{key, value -> value.name}
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assertTrue(below30Names == ["Long", "Dustin"])
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}
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@Test
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void group(){
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def map = [1:20, 2: 40, 3: 11, 4: 93]
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def subMap = map.groupBy{it.value % 2}
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println subMap
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assertTrue(subMap == [0:[1:20, 2:40 ], 1:[3:11, 4:93]])
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def keySubMap = map.subMap([1, 2])
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assertTrue(keySubMap == [1:20, 2:40])
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}
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@Test
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void sorting(){
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def map = [ab:20, a: 40, cb: 11, ba: 93]
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def naturallyOrderedMap = map.sort()
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assertTrue([a:40, ab:20, ba:93, cb:11] == naturallyOrderedMap)
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def compSortedMap = map.sort({ k1, k2 -> k1 <=> k2 } as Comparator)
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assertTrue([a:40, ab:20, ba:93, cb:11] == compSortedMap)
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def cloSortedMap = map.sort({ it1, it2 -> it1.value <=> it1.value })
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assertTrue([cb:11, ab:20, a:40, ba:93] == cloSortedMap)
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}
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}

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