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    • org.unix4j.convert.ListConverters Maven / Gradle / Ivy

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    package org.unix4j.convert;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

public class ListConverters {
	public static final ValueConverter> COLLECTION_TO_LIST = new ValueConverter>() {
		@Override
		public List convert(Object value) throws IllegalArgumentException {
			if (value instanceof Collection) {
				if (value instanceof List) {
					return (List)value;
				}
				return new ArrayList((Collection)value);
			}
			return null;
		}
	};
	public static final ValueConverter> OBJECT_ARRAY_TO_LIST = new ValueConverter>() {
		@Override
		public List convert(Object value) throws IllegalArgumentException {
			if (value instanceof Object[]) {
				return Arrays.asList((Object[])value);
			}
			return null;
		}
	};
	public static final ValueConverter> ANY_ARRAY_TO_LIST = new ValueConverter>() {
		@Override
		public List convert(Object value) throws IllegalArgumentException {
			if (value != null && value.getClass().isArray()) {
				final int len = Array.getLength(value);
				final List result = new ArrayList(len);
				for (int i = 0; i < len; i++) {
					final Object element = Array.get(value, i);
					result.add(element);
				}
				return result;
			}
			return null;
		}
	};
	public static final ValueConverter> ARRAY_TO_LIST = new CompositeValueConverter>().add(OBJECT_ARRAY_TO_LIST).add(ANY_ARRAY_TO_LIST);

	public static final ValueConverter> OBJECT_TO_SINGLETON_LIST = new ValueConverter>() {
		@Override
		public List convert(Object value) throws IllegalArgumentException {
			if (value != null) {
				return Collections.singletonList(value);
			}
			return null;
		}
	};
	
	public static final ValueConverter> COLLECTION_TO_FLAT_LIST = new ValueConverter>() {
		@Override
		public List convert(Object value) throws IllegalArgumentException {
			if (value instanceof Collection) {
				final Collection source = (Collection)value;
				final List target = new ArrayList(source.size());
				for (final Object element : source) {
					final List unnested = COLLECTION_OR_ARRAY_TO_FLAT_LIST.convert(element);
					if (unnested == null) {
						target.add(element);
					} else {
						target.addAll(unnested);
					}
				}
				return target;
			}
			return null;
		}
	};
	public static final ValueConverter> ARRAY_TO_FLAT_LIST = new ConcatenatedConverter>(ARRAY_TO_LIST, COLLECTION_TO_FLAT_LIST);
	public static final ValueConverter> COLLECTION_OR_ARRAY_TO_FLAT_LIST = new CompositeValueConverter>().add(COLLECTION_TO_FLAT_LIST).add(ARRAY_TO_FLAT_LIST);

	public static final ValueConverter> DEFAULT = new CompositeValueConverter>().add(COLLECTION_TO_LIST).add(ARRAY_TO_LIST).add(OBJECT_TO_SINGLETON_LIST);
	public static final ValueConverter> FLATTEN = new CompositeValueConverter>().add(COLLECTION_OR_ARRAY_TO_FLAT_LIST).add(OBJECT_TO_SINGLETON_LIST);
}
    
    
    
    

    




    
    
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