LANG-1067: Add a reflection-based variant of DiffBuilder

1 files changed, 131 insertions, 0 deletions

diff --git a/src/test/java/org/apache/commons/lang3/builder/ReflectionDiffBuilderTest.java b/src/test/java/org/apache/commons/lang3/builder/ReflectionDiffBuilderTest.java
new file mode 100644
index 000000000..8fcc76a45
--- /dev/null
+++ b/src/test/java/org/apache/commons/lang3/builder/ReflectionDiffBuilderTest.java
@@ -0,0 +1,131 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.lang3.builder;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+
+public class ReflectionDiffBuilderTest {
+
+    private static final ToStringStyle SHORT_STYLE = ToStringStyle.SHORT_PREFIX_STYLE;
+
+    @SuppressWarnings("unused")
+    private static class TypeTestClass implements Diffable<TypeTestClass> {
+        private ToStringStyle style = SHORT_STYLE;
+        private boolean booleanField = true;
+        private boolean[] booleanArrayField = {true};
+        private byte byteField = (byte) 0xFF;
+        private byte[] byteArrayField = {(byte) 0xFF};
+        private char charField = 'a';
+        private char[] charArrayField = {'a'};
+        private double doubleField = 1.0;
+        private double[] doubleArrayField = {1.0};
+        private float floatField = 1.0f;
+        private float[] floatArrayField = {1.0f};
+        int intField = 1;
+        private int[] intArrayField = {1};
+        private long longField = 1L;
+        private long[] longArrayField = {1L};
+        private short shortField = 1;
+        private short[] shortArrayField = {1};
+        private Object objectField = null;
+        private Object[] objectArrayField = {null};
+        private static int staticField;
+        private transient String transientField;
+
+        @Override
+        public DiffResult diff(final TypeTestClass obj) {
+            return new ReflectionDiffBuilder(this, obj, style).build();
+        }
+
+        @Override
+        public int hashCode() {
+            return HashCodeBuilder.reflectionHashCode(this, false);
+        }
+
+        @Override
+        public boolean equals(final Object obj) {
+            return EqualsBuilder.reflectionEquals(this, obj, false);
+        }
+    }
+
+    @SuppressWarnings("unused")
+    private static class TypeTestChildClass extends TypeTestClass {
+        String field = "a";
+    }
+
+    @Test
+    public void test_no_differences() {
+        final TypeTestClass firstObject = new TypeTestClass();
+        final TypeTestClass secondObject = new TypeTestClass();
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(0, list.getNumberOfDiffs());
+    }
+
+    @Test
+    public void test_primitive_difference() {
+        final TypeTestClass firstObject = new TypeTestClass();
+        firstObject.charField = 'c';
+        final TypeTestClass secondObject = new TypeTestClass();
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(1, list.getNumberOfDiffs());
+    }
+
+    @Test
+    public void test_array_difference() {
+        final TypeTestClass firstObject = new TypeTestClass();
+        firstObject.charArrayField = new char[] { 'c' };
+        final TypeTestClass secondObject = new TypeTestClass();
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(1, list.getNumberOfDiffs());
+    }
+
+    @Test
+    public void test_transient_field_difference() {
+        final TypeTestClass firstObject = new TypeTestClass();
+        firstObject.transientField = "a";
+        final TypeTestClass secondObject = new TypeTestClass();
+        firstObject.transientField = "b";
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(0, list.getNumberOfDiffs());
+    }
+
+    @Test
+    public void test_no_differences_inheritance() {
+        final TypeTestChildClass firstObject = new TypeTestChildClass();
+        final TypeTestChildClass secondObject = new TypeTestChildClass();
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(0, list.getNumberOfDiffs());
+    }
+
+    @Test
+    public void test_difference_in_inherited_field() {
+        final TypeTestChildClass firstObject = new TypeTestChildClass();
+        firstObject.intField = 99;
+        final TypeTestChildClass secondObject = new TypeTestChildClass();
+
+        final DiffResult list = firstObject.diff(secondObject);
+        assertEquals(1, list.getNumberOfDiffs());
+    }
+}