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Jodd BeanUtil is fast and powerful bean manipulation library.
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.typeconverter.impl;
import jodd.typeconverter.TypeConverter;
import jodd.typeconverter.TypeConverterManager;
import jodd.util.CsvUtil;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Converts given object to an array. This converter is specific, as it
* is not directly registered to a type; but created when needed.
* Conversion rules:
*
* null
value is returned as null
* - source non-array value is checked for
Collections
* - if non-array element can't be resolved, it is converted to single element array
* - source array is converted to target array, by converting each element
*
*/
@SuppressWarnings("unchecked")
public class ArrayConverter implements TypeConverter {
public static final char[] NUMBER_DELIMITERS = new char[] {',', ';', '\n'};
protected final TypeConverterManager typeConverterManager;
protected final Class targetComponentType;
public ArrayConverter(final TypeConverterManager typeConverterManager, final Class targetComponentType) {
this.typeConverterManager = typeConverterManager;
this.targetComponentType = targetComponentType;
}
@Override
public T[] convert(final Object value) {
if (value == null) {
return null;
}
Class valueClass = value.getClass();
if (!valueClass.isArray()) {
// source is not an array
return convertValueToArray(value);
}
// source is an array
return convertArrayToArray(value);
}
/**
* Converts type using type converter manager.
*/
protected T convertType(final Object value) {
return typeConverterManager.convertType(value, targetComponentType);
}
/**
* Creates new array of target component type.
* Default implementation uses reflection to create
* an array of target type. Override it for better performances.
*/
protected T[] createArray(final int length) {
return (T[]) Array.newInstance(targetComponentType, length);
}
/**
* Creates an array with single element.
*/
protected T[] convertToSingleElementArray(final Object value) {
T[] singleElementArray = createArray(1);
singleElementArray[0] = convertType(value);
return singleElementArray;
}
/**
* Converts non-array value to array. Detects various
* collection types and iterates them to make conversion
* and to create target array.
*/
protected T[] convertValueToArray(final Object value) {
if (value instanceof List) {
List list = (List) value;
T[] target = createArray(list.size());
for (int i = 0; i < list.size(); i++) {
Object element = list.get(i);
target[i] = convertType(element);
}
return target;
}
if (value instanceof Collection) {
Collection collection = (Collection) value;
T[] target = createArray(collection.size());
int i = 0;
for (Object element : collection) {
target[i] = convertType(element);
i++;
}
return target;
}
if (value instanceof Iterable) {
Iterable iterable = (Iterable) value;
List list = new ArrayList<>();
for (Object element : iterable) {
list.add(convertType(element));
}
T[] target = createArray(list.size());
return list.toArray(target);
}
if (value instanceof CharSequence) {
String[] strings = convertStringToArray(value.toString());
return convertArrayToArray(strings);
}
// everything else:
return convertToSingleElementArray(value);
}
/**
* Converts string to array, for the {@link #convertValueToArray(Object)} method.
* By default, the string is converted into an array using {@link jodd.util.CsvUtil}.
*/
protected String[] convertStringToArray(final String value) {
return CsvUtil.toStringArray(value);
}
/**
* Converts array value to array.
*/
protected T[] convertArrayToArray(final Object value) {
Class valueComponentType = value.getClass().getComponentType();
if (valueComponentType == targetComponentType) {
// equal types, no conversion needed
return (T[]) value;
}
T[] result;
if (valueComponentType.isPrimitive()) {
// convert primitive array to target array
result = convertPrimitiveArrayToArray(value, valueComponentType);
} else {
// convert object array to target array
Object[] array = (Object[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
return result;
}
/**
* Converts primitive array to target array.
*/
@SuppressWarnings("AutoBoxing")
protected T[] convertPrimitiveArrayToArray(final Object value, final Class primitiveComponentType) {
T[] result = null;
if (primitiveComponentType == int.class) {
int[] array = (int[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == long.class) {
long[] array = (long[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == float.class) {
float[] array = (float[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == double.class) {
double[] array = (double[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == short.class) {
short[] array = (short[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == byte.class) {
byte[] array = (byte[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == char.class) {
char[] array = (char[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
else if (primitiveComponentType == boolean.class) {
boolean[] array = (boolean[]) value;
result = createArray(array.length);
for (int i = 0; i < array.length; i++) {
result[i] = convertType(array[i]);
}
}
return result;
}
}