array to collection conversion

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayGenericConverter.java

@@ -17,16 +17,12 @@
 package org.springframework.core.convert.support;
 
 import java.lang.reflect.Array;
+import java.util.Arrays;
+import java.util.Collection;
 
+import org.springframework.core.CollectionFactory;
 import org.springframework.core.convert.TypeDescriptor;
 
-/**
- * A generic converter that can convert from one array type to another.
- *
- * @author Keith Donald
- * @author Juergen Hoeller
- * @since 3.0
- */
 class ArrayGenericConverter implements GenericConverter {
 
 	private GenericConversionService conversionService;
@@ -36,15 +32,33 @@ class ArrayGenericConverter implements GenericConverter {
 	}
 
 	public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return sourceType.isArray() && targetType.isArray();		
+		return sourceType.isArray() || targetType.isArray();		
 	}
 	
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		if (isArrayToArray(sourceType, targetType)) {
+			return convertArrayToArray(source, sourceType, targetType);
+		} else if (isArrayToCollection(sourceType, targetType)) {
+			return convertArrayToCollection(source, sourceType, targetType);
+		} else if (isCollectionToArray(sourceType, targetType)) {
+			return convertCollectionToArray(source, sourceType, targetType);
+		} else if (isArrayToObject(sourceType, targetType)) {
+			return convertArrayToObject(source, sourceType, targetType);			
+		} else {
+			return convertObjectToArray(source, sourceType, targetType);
+		}
+	}
+	
+	private boolean isArrayToArray(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isArray() && targetType.isArray();
+	}
+
+	private Object convertArrayToArray(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (sourceType.isAssignableTo(targetType)) {
 			return source;
 		}
-		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
 		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
+		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
 		Object target = Array.newInstance(targetElementType.getType(), Array.getLength(source));
 		GenericConverter converter = conversionService.getConverter(sourceElementType, targetElementType);
 		for (int i = 0; i < Array.getLength(target); i++) {
@@ -53,4 +67,46 @@ class ArrayGenericConverter implements GenericConverter {
 		return target;		
 	}
 
+	private boolean isArrayToCollection(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isArray() && targetType.isCollection();
+	}
+
+	private Object convertArrayToCollection(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		int length = Array.getLength(source);
+		Collection collection = CollectionFactory.createCollection(targetType.getType(), length);
+		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
+		if (targetElementType == TypeDescriptor.NULL) {
+			for (int i = 0; i < length; i++) {
+				collection.add(Array.get(source, i));
+			}
+		} else {
+			TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
+			GenericConverter converter = conversionService.getConverter(sourceElementType, targetElementType);
+			for (int i = 0; i < length; i++) {
+				collection.add(converter.convert(Array.get(source, i), sourceElementType, targetElementType));
+			}
+		}
+		return collection;
+	}
+
+	private boolean isCollectionToArray(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isCollection() && targetType.isArray();
+	}
+
+	private Object convertCollectionToArray(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+	
+	private boolean isArrayToObject(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isArray();
+	}
+
+	private Object convertArrayToObject(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+
+	private Object convertObjectToArray(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+
 }

org.springframework.core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java

@@ -153,7 +153,6 @@ public class GenericConversionServiceTests {
 	}
 
 	@Test
-	@Ignore
 	public void convertArrayToListInterface() {
 		List<?> result = converter.convert(new String[] { "1", "2", "3" }, List.class);
 		assertEquals("1", result.get(0));
@@ -164,7 +163,6 @@ public class GenericConversionServiceTests {
 	public List<Integer> genericList = new ArrayList<Integer>();
 
 	@Test
-	@Ignore
 	public void convertArrayToListGenericTypeConversion() throws Exception {
 		converter.addConverterFactory(new StringToNumberConverterFactory());
 		List<Integer> result = (List<Integer>) converter.convert(new String[] { "1", "2", "3" }, TypeDescriptor
@@ -175,7 +173,6 @@ public class GenericConversionServiceTests {
 	}
 
 	@Test
-	@Ignore
 	public void convertArrayToListImpl() {
 		LinkedList<?> result = converter.convert(new String[] { "1", "2", "3" }, LinkedList.class);
 		assertEquals("1", result.get(0));
@@ -183,14 +180,9 @@ public class GenericConversionServiceTests {
 		assertEquals("3", result.get(2));
 	}
 
-	@Test
+	@Test(expected=ConversionFailedException.class)
-	@Ignore
 	public void convertArrayToAbstractList() {
-		try {
+		converter.convert(new String[] { "1", "2", "3" }, AbstractList.class);
-			converter.convert(new String[] { "1", "2", "3" }, AbstractList.class);
-		} catch (IllegalArgumentException e) {
-
-		}
 	}
 
 	@Test