From 45be1b60457eaa89e2dca7bbbc928154a2596a40 Mon Sep 17 00:00:00 2001
From: joe zhang <joe.zhang@ringcentral.com>
Date: Tue, 28 Jul 2020 21:12:15 +0800
Subject: [PATCH] Add primitive type check method and unit tests

---
 .../core-java-lang-oop-types/pom.xml          |  8 ++++
 .../primitivetype/PrimitiveTypeUtil.java      | 38 +++++++++++++++++
 .../primitivetype/PrimitiveTypeUtilTest.java  | 41 +++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 core-java-modules/core-java-lang-oop-types/src/main/java/com/baeldung/primitivetype/PrimitiveTypeUtil.java
 create mode 100644 core-java-modules/core-java-lang-oop-types/src/test/java/com/baeldung/primitivetype/PrimitiveTypeUtilTest.java

diff --git a/core-java-modules/core-java-lang-oop-types/pom.xml b/core-java-modules/core-java-lang-oop-types/pom.xml
index 5555df4818..ee167bbae2 100644
--- a/core-java-modules/core-java-lang-oop-types/pom.xml
+++ b/core-java-modules/core-java-lang-oop-types/pom.xml
@@ -12,4 +12,12 @@
     <artifactId>core-java-lang-oop-types</artifactId>
     <name>core-java-lang-oop-types</name>
     <packaging>jar</packaging>
+    
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+    </dependencies>
 </project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-lang-oop-types/src/main/java/com/baeldung/primitivetype/PrimitiveTypeUtil.java b/core-java-modules/core-java-lang-oop-types/src/main/java/com/baeldung/primitivetype/PrimitiveTypeUtil.java
new file mode 100644
index 0000000000..c749ed9dcd
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-types/src/main/java/com/baeldung/primitivetype/PrimitiveTypeUtil.java
@@ -0,0 +1,38 @@
+package com.baeldung.primitivetype;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.commons.lang3.ClassUtils;
+
+import com.google.common.primitives.Primitives;
+
+public class PrimitiveTypeUtil {
+
+    private static final Map<Class<?>, Class<?>> WRAPPER_TYPE_MAP;
+    static {
+        WRAPPER_TYPE_MAP = new HashMap<Class<?>, Class<?>>(16);
+        WRAPPER_TYPE_MAP.put(Integer.class, int.class);
+        WRAPPER_TYPE_MAP.put(Byte.class, byte.class);
+        WRAPPER_TYPE_MAP.put(Character.class, char.class);
+        WRAPPER_TYPE_MAP.put(Boolean.class, boolean.class);
+        WRAPPER_TYPE_MAP.put(Double.class, double.class);
+        WRAPPER_TYPE_MAP.put(Float.class, float.class);
+        WRAPPER_TYPE_MAP.put(Long.class, long.class);
+        WRAPPER_TYPE_MAP.put(Short.class, short.class);
+        WRAPPER_TYPE_MAP.put(Void.class, void.class);
+    }
+
+    public boolean isPrimitiveTypeByCommansLang(Object source) {
+        return ClassUtils.isPrimitiveOrWrapper(source.getClass());
+    }
+
+    public boolean isPrimitiveTypeByGuava(Object source) {
+        return Primitives.isWrapperType(source.getClass());
+    }
+
+    public boolean isPrimitiveType(Object source) {
+        return WRAPPER_TYPE_MAP.containsKey(source.getClass());
+    }
+
+}
diff --git a/core-java-modules/core-java-lang-oop-types/src/test/java/com/baeldung/primitivetype/PrimitiveTypeUtilTest.java b/core-java-modules/core-java-lang-oop-types/src/test/java/com/baeldung/primitivetype/PrimitiveTypeUtilTest.java
new file mode 100644
index 0000000000..7d3c2964d4
--- /dev/null
+++ b/core-java-modules/core-java-lang-oop-types/src/test/java/com/baeldung/primitivetype/PrimitiveTypeUtilTest.java
@@ -0,0 +1,41 @@
+package com.baeldung.primitivetype;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class PrimitiveTypeUtilTest {
+
+    private PrimitiveTypeUtil primitiveTypeUtil;
+    private boolean booleanVal = false;
+    private Long longWrapper = 1L;
+    private String nonPrimitiveVal = "Test";
+
+    @Before
+    public void setup() {
+        primitiveTypeUtil = new PrimitiveTypeUtil();
+    }
+
+    @Test
+    public void givenObjectWhenCheckWithGuavaShouldValidate() {
+        assertTrue(primitiveTypeUtil.isPrimitiveTypeByGuava(booleanVal));
+        assertTrue(primitiveTypeUtil.isPrimitiveTypeByGuava(longWrapper));
+        assertFalse(primitiveTypeUtil.isPrimitiveTypeByGuava(nonPrimitiveVal));
+    }
+
+    @Test
+    public void givenObjectWhenCheckWithCommansLangShouldValidate() {
+        assertTrue(primitiveTypeUtil.isPrimitiveTypeByCommansLang(booleanVal));
+        assertTrue(primitiveTypeUtil.isPrimitiveTypeByCommansLang(longWrapper));
+        assertFalse(primitiveTypeUtil.isPrimitiveTypeByCommansLang(nonPrimitiveVal));
+    }
+
+    @Test
+    public void givenPrimitiveOrWrapperWhenCheckWithCustomMethodShouldReturnTrue() {
+        assertTrue(primitiveTypeUtil.isPrimitiveType(booleanVal));
+        assertTrue(primitiveTypeUtil.isPrimitiveType(longWrapper));
+        assertFalse(primitiveTypeUtil.isPrimitiveType(nonPrimitiveVal));
+    }
+}