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JaVers - object auditing and diff framework for Java
package org.javers.core.metamodel.type;
import org.javers.common.collections.EnumerableFunction;
import java.util.*;
import org.javers.common.validation.Validate;
import org.javers.core.metamodel.object.OwnerContext;
import java.lang.reflect.Type;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Collections.unmodifiableList;
/**
* Collection or Array or Map
* @author bartosz walacik
*/
public abstract class EnumerableType extends ClassType {
EnumerableType(Type baseJavaType, int expectedArgs) {
super(baseJavaType, Optional.empty(), expectedArgs);
}
/**
* OwnerContext aware version of {@link #map(Object, EnumerableFunction, OwnerContext)}
*
* @return immutable Enumerable
*/
public abstract Object map(Object sourceEnumerable, EnumerableFunction mapFunction, OwnerContext owner);
public abstract Class getEnumerableInterface();
/**
* Returns a new Enumerable (unmodifiable when possible)
* with items from sourceEnumerable mapped by mapFunction.
*/
public Object map(Object sourceEnumerable, Function mapFunction) {
return map(sourceEnumerable, mapFunction, false);
}
public abstract Object map(Object sourceEnumerable, Function mapFunction, boolean filterNulls);
public abstract boolean isEmpty(Object container);
public abstract Object empty();
/**
* Returns a new, unmodifiable Enumerable with filtered items,
* nulls are omitted.
*/
public List filterToList(Object source, Class filter) {
Validate.argumentsAreNotNull(filter);
return (List) unmodifiableList(
items(source).filter(item -> item!=null && filter.isAssignableFrom(item.getClass()))
.collect(Collectors.toList()));
}
protected abstract Stream