collection and array merged into one

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

@@ -1,112 +0,0 @@
-/*
- * Copyright 2002-2009 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.
- * 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.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;
-
-class ArrayGenericConverter implements GenericConverter {
-
-	private GenericConversionService conversionService;
-
-	public ArrayGenericConverter(GenericConversionService conversionService) {
-		this.conversionService = conversionService;
-	}
-
-	public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		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 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++) {
-			Array.set(target, i, converter.convert(Array.get(source, i), sourceElementType, targetElementType));
-		}
-		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/main/java/org/springframework/core/convert/support/CollectionGenericConverter.java

@@ -16,18 +16,13 @@
 
 package org.springframework.core.convert.support;
 
+import java.lang.reflect.Array;
 import java.util.Collection;
+import java.util.Iterator;
 
 import org.springframework.core.CollectionFactory;
 import org.springframework.core.convert.TypeDescriptor;
 
-/**
- * A generic converter that can convert from one collection type to another.
- *
- * @author Keith Donald
- * @author Juergen Hoeller
- * @since 3.0
- */
 class CollectionGenericConverter implements GenericConverter {
 
 	private GenericConversionService conversionService;
@@ -35,32 +30,125 @@ class CollectionGenericConverter implements GenericConverter {
 	public CollectionGenericConverter(GenericConversionService conversionService) {
 		this.conversionService = conversionService;
 	}
-	
+
 	public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return sourceType.isCollection() && targetType.isCollection();
+		return sourceType.isArray() || targetType.isArray() || sourceType.isCollection() || targetType.isCollection();	
 	}
-
+	
 	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 (isCollectionToCollection(sourceType, targetType)) {
+			return convertCollectionToCollection(source, sourceType, targetType);
+		} else if (isCollectionToArray(sourceType, targetType)) {
+			return convertCollectionToArray(source, sourceType, targetType); 
+		} else if (isArrayToObject(sourceType, targetType)) {
+			return convertArrayToObject(source, sourceType, targetType);			
+		} else if (isObjectToArray(sourceType, targetType)) {
+			return convertObjectToArray(source, sourceType, targetType);
+		} else if (isCollectionToObject(sourceType, targetType))  {
+			return convertCollectionToObject(source, sourceType, targetType);
+		} else {
+			return convertObjectToCollection(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 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++) {
+			Array.set(target, i, converter.convert(Array.get(source, i), sourceElementType, targetElementType));
+		}
+		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 sourceElementType = sourceType.getElementTypeDescriptor();
+		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
+		if (targetElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetElementType)) {
+			for (int i = 0; i < length; i++) {
+				collection.add(Array.get(source, i));
+			}
+		} else {
+			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) {
 		Collection sourceCollection = (Collection) source;
+		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
+		if (sourceElementType == TypeDescriptor.NULL) {
+			sourceElementType = getElementType(sourceCollection);
+		}
 		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
-		if (targetElementType == TypeDescriptor.NULL) {
-			return compatibleCollectionWithoutElementConversion(sourceCollection, targetType);
+		Object array = Array.newInstance(targetElementType.getType(), sourceCollection.size());
+		int i = 0;		
+		if (sourceElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetElementType)) {
+			for (Iterator it = sourceCollection.iterator(); it.hasNext(); i++) {
+				Array.set(array, i, it.next());
+			}
+		} else {
+			GenericConverter converter = conversionService.getConverter(sourceElementType, targetElementType);
+			for (Iterator it = sourceCollection.iterator(); it.hasNext(); i++) {
+				Array.set(array, i, converter.convert(it.next(), sourceElementType, targetElementType));
+			}
 		}
+		return array;
+	}
+	
+	private boolean isCollectionToCollection(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isCollection() && targetType.isCollection();
+	}
+
+	public Object convertCollectionToCollection(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		Collection sourceCollection = (Collection) source;
 		TypeDescriptor sourceElementType = sourceType.getElementTypeDescriptor();
 		if (sourceElementType == TypeDescriptor.NULL) {
 			sourceElementType = getElementType(sourceCollection);
 		}
+		TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
 		if (sourceElementType == TypeDescriptor.NULL || sourceElementType.isAssignableTo(targetElementType)) {
-			return compatibleCollectionWithoutElementConversion(sourceCollection, targetType);
+			if (sourceType.isAssignableTo(targetType)) {
+				return source;
+			} else {
+				Collection targetCollection = CollectionFactory.createCollection(targetType.getType(), sourceCollection.size());
+				targetCollection.addAll(sourceCollection);
+				return targetCollection;
+			}
 		}
 		Collection targetCollection = CollectionFactory.createCollection(targetType.getType(), sourceCollection.size());
-		GenericConverter elementConverter = conversionService.getConverter(sourceElementType, targetElementType);
+		GenericConverter converter = conversionService.getConverter(sourceElementType, targetElementType);
 		for (Object element : sourceCollection) {
-			targetCollection.add(elementConverter.convert(element, sourceElementType, targetElementType));
+			targetCollection.add(converter.convert(element, sourceElementType, targetElementType));
 		}
 		return targetCollection;
 	}
-
+	
 	private TypeDescriptor getElementType(Collection collection) {
 		for (Object element : collection) {
 			if (element != null) {
@@ -70,14 +158,32 @@ class CollectionGenericConverter implements GenericConverter {
 		return TypeDescriptor.NULL;
 	}
 
-	private Collection compatibleCollectionWithoutElementConversion(Collection source, TypeDescriptor targetType) {
-		if (targetType.getType().isAssignableFrom(source.getClass())) {
-			return source;
-		} else {
-			Collection target = CollectionFactory.createCollection(targetType.getType(), source.size());
-			target.addAll(source);
-			return target;
-		}
+	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 boolean isObjectToArray(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return targetType.isArray();
+	}
+
+	private Object convertObjectToArray(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+	
+	private boolean isCollectionToObject(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return sourceType.isCollection();
+	}
+
+	private Object convertCollectionToObject(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
+	}
+
+	private Object convertObjectToCollection(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		throw new UnsupportedOperationException("Not yet implemented");
 	}
 
-}
+}

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

@@ -184,7 +184,6 @@ public class GenericConversionService implements ConversionService, ConverterReg
 	protected void initGenericConverters() {
 		addGenericConverter(new CollectionGenericConverter(this));
 		addGenericConverter(new MapGenericConverter(this));
-		addGenericConverter(new ArrayGenericConverter(this));
 	}
 
 	protected void addGenericConverter(GenericConverter converter) {

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

@@ -186,7 +186,6 @@ public class GenericConversionServiceTests {
 	}
 
 	@Test
-	@Ignore
 	public void convertListToArray() {
 		List<String> list = new ArrayList<String>();
 		list.add("1");
@@ -199,7 +198,6 @@ public class GenericConversionServiceTests {
 	}
 
 	@Test
-	@Ignore
 	public void convertListToArrayWithComponentConversion() {
 		converter.addConverterFactory(new StringToNumberConverterFactory());
 		List<String> list = new ArrayList<String>();