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    • leap.lang.convert.ArrayConverter Maven / Gradle / Ivy

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    /*
 * Copyright 2012 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 leap.lang.convert;

import java.lang.reflect.Array;
import java.lang.reflect.Type;
import java.util.Collection;

import leap.lang.Out;
import leap.lang.Strings;

public class ArrayConverter extends AbstractConverter{

	@SuppressWarnings("unused")
	public boolean convertFrom(Object value, Class targetType, Type genericType, Out out, ConvertContext context) throws Throwable {
		Class sourceType = value.getClass();
		Class targetComponentType = targetType.getComponentType();

		if (sourceType.isArray()) {
			
			Class sourceCompoenentType = sourceType.getComponentType();

			if (targetComponentType.isAssignableFrom(sourceCompoenentType)) {
				out.set(value);
			} else {
				int length = Array.getLength(value);
				Object array = Array.newInstance(targetComponentType, length);
				for (int i = 0; i < length; i++) {
					Array.set(array, i, Converts.convert(Array.get(value, i),targetComponentType));
				}
				out.set(array);
			}
			
			return true;
			
		} else if (value instanceof CharSequence) {
			out.set(stringToArray(value.toString(),targetComponentType));
			return true;
		} else if (value instanceof Collection) {
			Collection collection = (Collection)value;

			out.set(iterableToArray(collection, targetComponentType, collection.size()));
			return true;
		} else if (value instanceof Iterable) {
			Iterable iterable = (Iterable) value;
			
			int length = 0;
			
			for (Object e : iterable) {
				length++;
			}
			
			out.set(iterableToArray(iterable, targetComponentType, length));
			return true;
		}

		return false;
	}

	@Override
    public String convertToString(Object array) throws Throwable {
		
        StringBuilder string = new StringBuilder(128);
        
        for(int i=0;i 0){
                string.append(',');
            }
            
            string.append(Converts.toString(Array.get(array, i)));
        }
        
        return string.toString();
    }
	
	private static Object iterableToArray(Iterable iterable,Class componentType,int length){
		Object array = Array.newInstance(componentType, length);

		if(length > 0){
			int index = 0;
			
			for (Object element : iterable) {
				Array.set(array, index++, Converts.convert(element,componentType));
			}
		}

		return array;
	}
	
    private static Object stringToArray(String string,Class componentType){
        String[] strings = Strings.split(string,',');
        
        Object array = Array.newInstance(componentType, strings.length);
        
        for(int i=0;i    
    
    
    

    




    
    
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