Fix #60 Add property for Double values

src/main/java/ch/jalu/configme/properties/DoubleProperty.java

@@ -0,0 +1,20 @@
+package ch.jalu.configme.properties;
+
+import ch.jalu.configme.resource.PropertyReader;
+
+public class DoubleProperty extends BaseProperty<Double> {
+
+    public DoubleProperty(String path, double defaultValue) {
+        super(path, defaultValue);
+    }
+
+    @Override
+    protected Double getFromResource(PropertyReader reader) {
+        return reader.getDouble(getPath());
+    }
+
+    @Override
+    public Object toExportValue(Double value) {
+        return value;
+    }
+}

src/main/java/ch/jalu/configme/properties/PropertyInitializer.java

@@ -40,6 +40,17 @@ public static Property<Integer> newProperty(String path, int defaultValue) {
         return new IntegerProperty(path, defaultValue);
     }
 
+    /**
+     * Creates a new double property.
+     *
+     * @param path the property's path
+     * @param defaultValue the default value
+     * @return the created property
+     */
+    public static Property<Double> newProperty(String path, double defaultValue) {
+        return new DoubleProperty(path, defaultValue);
+    }
+
     /**
      * Creates a new String property.
      *

src/test/java/ch/jalu/configme/properties/DoublePropertyTest.java

@@ -0,0 +1,60 @@
+package ch.jalu.configme.properties;
+
+import ch.jalu.configme.resource.PropertyReader;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.mockito.BDDMockito.given;
+
+/**
+ * Test for {@link DoubleProperty}.
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class DoublePropertyTest {
+
+    @Mock
+    private PropertyReader reader;
+
+    @Test
+    public void shouldReturnDoubleFromResource() {
+        // given
+        Property<Double> property = new DoubleProperty("test.path", 3.4);
+        given(reader.getDouble("test.path")).willReturn(-2508.346);
+
+        // when
+        double result = property.determineValue(reader);
+
+        // then
+        assertThat(result, equalTo(-2508.346));
+    }
+
+    @Test
+    public void shouldReturnDefaultValue() {
+        // given
+        Property<Double> property = new DoubleProperty("property.path", 5.9);
+        given(reader.getDouble("property.path")).willReturn(null);
+
+        // when
+        double result = property.determineValue(reader);
+
+        // then
+        assertThat(result, equalTo(5.9));
+    }
+
+    @Test
+    public void shouldReturnValueAsExportValue() {
+        // given
+        Property<Double> property = new DoubleProperty("property.path", 4);
+        double givenValue = 4.3456;
+
+        // when
+        Object exportValue = property.toExportValue(givenValue);
+
+        // then
+        assertThat(exportValue, equalTo(givenValue));
+    }
+}

src/test/java/ch/jalu/configme/properties/PropertyInitializerTest.java

@@ -25,6 +25,7 @@ public class PropertyInitializerTest {
     public void shouldInstantiateProperties() {
         assertThat(newProperty("my.path", true), instanceOf(BooleanProperty.class));
         assertThat(newProperty("my.path", 12), instanceOf(IntegerProperty.class));
+        assertThat(newProperty("my.path", -8.4), instanceOf(DoubleProperty.class));
         assertThat(newProperty("my.path", "default"), instanceOf(StringProperty.class));
         assertThat(newProperty(TestEnum.class, "my.path", TestEnum.FIRST), instanceOf(EnumProperty.class));
         assertThat(newListProperty("path", "default", "entries"), instanceOf(StringListProperty.class));

src/test/java/ch/jalu/configme/resource/YamlFileReaderTest.java

@@ -76,7 +76,7 @@ public void shouldReadAllProperties() {
         expected.put(TestConfiguration.VERSION_NUMBER, 2492);
         expected.put(TestConfiguration.SKIP_BORING_FEATURES, false);
         expected.put(TestConfiguration.BORING_COLORS, Arrays.asList("beige", "gray"));
-        expected.put(TestConfiguration.DUST_LEVEL, 2);
+        expected.put(TestConfiguration.DUST_LEVEL, 2.4);
         expected.put(TestConfiguration.USE_COOL_FEATURES, true);
         expected.put(TestConfiguration.COOL_OPTIONS, Arrays.asList("Dinosaurs", "Explosions", "Big trucks"));
 

src/test/java/ch/jalu/configme/resource/YamlFileResourceTest.java

@@ -75,7 +75,7 @@ public void shouldWriteMissingProperties() {
         expected.put(TestConfiguration.VERSION_NUMBER, 32046);
         expected.put(TestConfiguration.SKIP_BORING_FEATURES, false);
         expected.put(TestConfiguration.BORING_COLORS, Collections.EMPTY_LIST);
-        expected.put(TestConfiguration.DUST_LEVEL, -1);
+        expected.put(TestConfiguration.DUST_LEVEL, -1.1);
         expected.put(TestConfiguration.USE_COOL_FEATURES, false);
         expected.put(TestConfiguration.COOL_OPTIONS, asList("Dinosaurs", "Explosions", "Big trucks"));
         for (Map.Entry<Property<?>, Object> entry : expected.entrySet()) {
@@ -117,7 +117,7 @@ public void shouldProperlyExportAnyValues() {
         expected.put(TestConfiguration.VERSION_NUMBER, -1337);
         expected.put(TestConfiguration.SKIP_BORING_FEATURES, false);
         expected.put(TestConfiguration.BORING_COLORS, asList("it's a difficult string!", "gray\nwith new lines\n"));
-        expected.put(TestConfiguration.DUST_LEVEL, -1);
+        expected.put(TestConfiguration.DUST_LEVEL, -1.1);
         expected.put(TestConfiguration.USE_COOL_FEATURES, true);
         expected.put(TestConfiguration.COOL_OPTIONS, Collections.EMPTY_LIST);
         expected.put(properties.get(0), properties.get(0).getDefaultValue());

src/test/java/ch/jalu/configme/samples/TestConfiguration.java

@@ -47,8 +47,8 @@ public final class TestConfiguration implements SettingsHolder {
         newListProperty("features.boring.colors");
 
     // No comment
-    public static final Property<Integer> DUST_LEVEL =
-        newProperty("features.boring.dustLevel", -1);
+    public static final Property<Double> DUST_LEVEL =
+        newProperty("features.boring.dustLevel", -1.1);
 
     @Comment("Enable cool features?")
     public static final Property<Boolean> USE_COOL_FEATURES =

src/test/resources/config-export-expected.yml

@@ -25,7 +25,7 @@ features:
         colors: 
         - beige
         - gray
-        dustLevel: 2
+        dustLevel: 2.4
     # Cool features
     # Contains cool settings
     cool:

src/test/resources/config-sample.yml

@@ -17,7 +17,7 @@ features:
         colors:
             - 'beige'
             - 'gray'
-        dustLevel: 2
+        dustLevel: 2.4
     cool:
         enabled: true
         options: