From 340a8b28f9c9b6bbe1ef0d4d23308ae43aad0390 Mon Sep 17 00:00:00 2001
From: Juergen Hoeller <jhoeller@vmware.com>
Date: Tue, 19 Jul 2011 15:54:36 +0000
Subject: [PATCH] ConvertiblePair implements equals and hashCode (SPR-8459)

---
 .../convert/converter/GenericConverter.java   | 26 ++++++++++++++++---
 .../GenericConversionServiceTests.java        | 26 +++++++++++++++++++
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/org.springframework.core/src/main/java/org/springframework/core/convert/converter/GenericConverter.java b/org.springframework.core/src/main/java/org/springframework/core/convert/converter/GenericConverter.java
index 52da8c3ca0..84c93c8b99 100644
--- a/org.springframework.core/src/main/java/org/springframework/core/convert/converter/GenericConverter.java
+++ b/org.springframework.core/src/main/java/org/springframework/core/convert/converter/GenericConverter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,11 @@
 
 package org.springframework.core.convert.converter;
 
-import java.util.Set;
-
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.util.Assert;
 
+import java.util.Set;
+
 /**
  * Generic converter interface for converting between two or more types.
  *
@@ -87,6 +87,24 @@ public interface GenericConverter {
 		public Class<?> getTargetType() {
 			return this.targetType;
 		}
-	}
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+				return true;
+			}
+            if (obj == null || obj.getClass() != ConvertiblePair.class) {
+				return false;
+			}
+            ConvertiblePair other = (ConvertiblePair) obj;
+            return this.sourceType.equals(other.sourceType) && this.targetType.equals(other.targetType);
+
+        }
+
+        @Override
+        public int hashCode() {
+            return this.sourceType.hashCode() * 31 + this.targetType.hashCode();
+        }
+    }
 
 }
diff --git a/org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java b/org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java
index d941ec832e..cb06f31350 100644
--- a/org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java
+++ b/org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java
@@ -19,10 +19,12 @@ package org.springframework.core.convert.support;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import org.junit.Test;
 
@@ -30,6 +32,7 @@ import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.convert.ConverterNotFoundException;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.converter.Converter;
+import org.springframework.core.convert.converter.GenericConverter;
 import org.springframework.core.io.DescriptiveResource;
 import org.springframework.core.io.Resource;
 import org.springframework.util.StopWatch;
@@ -378,6 +381,29 @@ public class GenericConversionServiceTests {
 	
 	public static Map<String, Integer> map;
 
+	@Test
+	public void testConvertiblePairsInSet() throws Exception {
+		Set<GenericConverter.ConvertiblePair> set = new HashSet<GenericConverter.ConvertiblePair>();
+		set.add(new GenericConverter.ConvertiblePair(Number.class, String.class));
+		assert set.contains(new GenericConverter.ConvertiblePair(Number.class, String.class));
+	}
+
+	@Test
+	public void testConvertiblePairEqualsAndHash() throws Exception {
+		GenericConverter.ConvertiblePair pair = new GenericConverter.ConvertiblePair(Number.class, String.class);
+		GenericConverter.ConvertiblePair pairEqual = new GenericConverter.ConvertiblePair(Number.class, String.class);
+		assertEquals(pair, pairEqual);
+		assertEquals(pair.hashCode(), pairEqual.hashCode());
+	}
+
+	@Test
+	public void testConvertiblePairDifferentEqualsAndHash() throws Exception {
+		GenericConverter.ConvertiblePair pair = new GenericConverter.ConvertiblePair(Number.class, String.class);
+		GenericConverter.ConvertiblePair pairOpposite = new GenericConverter.ConvertiblePair(String.class, Number.class);
+		assertFalse(pair.equals(pairOpposite));
+		assertFalse(pair.hashCode() == pairOpposite.hashCode());
+	}
+
 
 	private interface MyBaseInterface {