Calculator++ core module

calculatorpp-core/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.solovyev.android</groupId>
+        <artifactId>calculatorpp-parent</artifactId>
+        <version>1.3.1</version>
+    </parent>
+
+    <groupId>org.solovyev.android</groupId>
+    <artifactId>calculatorpp-core</artifactId>
+    <version>1.3.1</version>
+    <name>Calculator++ Application Core</name>
+
+    <packaging>jar</packaging>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.intellij</groupId>
+            <artifactId>annotations</artifactId>
+        </dependency>
+
+    </dependencies>
+
+    
+</project>

calculatorpp-core/src/main/java/org/solovyev/math/units/Unit.java

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+package org.solovyev.math.units;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 4/21/12
+ * Time: 7:54 PM
+ */
+public interface Unit<V> {
+
+    @NotNull
+    V getValue();
+
+    @NotNull
+    UnitType<V> getUnitType();
+}

calculatorpp-core/src/main/java/org/solovyev/math/units/UnitConverter.java

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+package org.solovyev.math.units;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 4/21/12
+ * Time: 7:53 PM
+ */
+public interface UnitConverter<T> {
+
+    boolean isSupported(@NotNull UnitType<?> from, @NotNull UnitType<T> to);
+
+    @NotNull
+    Unit<T> convert(@NotNull Unit<?> from, @NotNull UnitType<T> toType);
+
+    public static class Dummy implements UnitConverter<Object> {
+
+        @NotNull
+        private static final Dummy instance = new Dummy();
+
+        @NotNull
+        public static <T> UnitConverter<T> getInstance() {
+            return (UnitConverter<T>)instance;
+        }
+
+        private Dummy() {
+        }
+
+        @Override
+        public boolean isSupported(@NotNull UnitType<?> from, @NotNull UnitType<Object> to) {
+            return false;
+        }
+
+        @NotNull
+        @Override
+        public Unit<Object> convert(@NotNull Unit<?> from, @NotNull UnitType<Object> toType) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+}

calculatorpp-core/src/main/java/org/solovyev/math/units/UnitImpl.java

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+package org.solovyev.math.units;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 4/21/12
+ * Time: 8:01 PM
+ */
+public class UnitImpl<V> implements Unit<V> {
+
+    @NotNull
+    private V value;
+
+    @NotNull
+    private UnitType<V> unitType;
+
+    private UnitImpl() {
+    }
+
+    @NotNull
+    public static <V> Unit<V> newInstance(@NotNull V value, @NotNull UnitType<V> unitType) {
+        final UnitImpl<V> result = new UnitImpl<V>();
+
+        result.value = value;
+        result.unitType = unitType;
+
+        return result;
+    }
+
+    @NotNull
+    @Override
+    public V getValue() {
+        return this.value;
+    }
+
+    @NotNull
+    @Override
+    public UnitType<V> getUnitType() {
+        return unitType;
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/math/units/UnitType.java

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+package org.solovyev.math.units;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 4/21/12
+ * Time: 7:55 PM
+ */
+public interface UnitType<V> {
+
+    @NotNull
+    Class<V> getUnitValueClass();
+
+    boolean equals(@NotNull Object o);
+}