Add ExpressionConvertible

.gitignore

@@ -1,2 +1,7 @@
 .idea/
 /build
+.gradle/
+*.iml
+*.ipr
+*.iws
+out/

build.gradle

@@ -1,14 +1,13 @@
 apply plugin: 'java'
+apply plugin: 'idea'
+apply from: "https://github.com/shadowfacts/maven/raw/master/maven.gradle"
 
 sourceCompatibility = 1.7
 targetCompatibility = 1.7
+group = "no.birkett"
+archivesBaseName = "kiwi"
 version = '1.0'
 
-task wrapper(type: Wrapper) {
-  gradleVersion = '1.9'
-  distributionUrl = 'http://services.gradle.org/distributions/gradle-1.9-all.zip'
-}
-
 repositories {
     mavenCentral()
 }

local.properties

@@ -1,11 +0,0 @@
-## This file is automatically generated by Android Studio.
-# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
-#
-# This file must *NOT* be checked into Version Control Systems,
-# as it contains information specific to your local configuration.
-#
-# Location of the SDK. This is only used by Gradle.
-# For customization when using a Version Control System, please read the
-# header note.
-#Sat Jan 31 12:43:25 CET 2015
-sdk.dir=/Users/alex/sdk

settings.gradle

@@ -1,4 +1 @@
 rootProject.name = 'kiwi-java'
-
-include 'lib'
-

src/main/java/no/birkett/kiwi/Expression.java

@@ -6,7 +6,7 @@ import java.util.List;
 /**
  * Created by alex on 30/01/15.
  */
-public class Expression {
+public class Expression implements ExpressionConvertible {
 
     private List<Term> terms;
 
@@ -69,6 +69,11 @@ public class Expression {
         return terms.size() == 0;
     }
 
+    @Override
+    public Expression toExpression() {
+        return this;
+    }
+
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder();

src/main/java/no/birkett/kiwi/ExpressionConvertible.java

@@ -0,0 +1,10 @@
+package no.birkett.kiwi;
+
+/**
+ * @author shadowfacts
+ */
+public interface ExpressionConvertible {
+
+	Expression toExpression();
+
+}

src/main/java/no/birkett/kiwi/Term.java

@@ -3,7 +3,7 @@ package no.birkett.kiwi;
 /**
  * Created by alex on 30/01/15.
  */
-public class Term {
+public class Term implements ExpressionConvertible {
 
     private Variable variable;
     double coefficient;
@@ -37,6 +37,11 @@ public class Term {
         return coefficient * variable.getValue();
     }
 
+    @Override
+    public Expression toExpression() {
+        return new Expression(this);
+    }
+
     @Override
     public String toString() {
         return "variable: (" + variable + ") coefficient: "  + coefficient;

src/main/java/no/birkett/kiwi/Variable.java

@@ -3,7 +3,7 @@ package no.birkett.kiwi;
 /**
  * Created by alex on 30/01/15.
  */
-public class Variable {
+public class Variable implements ExpressionConvertible {
 
     private String name;
 
@@ -28,6 +28,11 @@ public class Variable {
         return name;
     }
 
+    @Override
+    public Expression toExpression() {
+        return new Expression(new Term(this));
+    }
+
     @Override
     public String toString() {
         return "name: " + name + " value: " + value;