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package org.scijava.util;

import java.util.List;

/**
 * Interface for primitive-type extensible arrays, modeled after
 * {@link java.util.ArrayList}, but more performant.
 * <p>
 * For primitive type arrays, {@link java.util.ArrayList} is not a good choice
 * because it uses boxing and unboxing to store the elements, leading to a large
 * memory footprint as well as performance penalties.
 * </p>
 * 
 * @author Johannes Schindelin
 * @author Curtis Rueden
 * @param <ArrayType> Type of the primitive array; e.g., {@code double[]}.
 * @param <BaseType> Boxed type of the array element; e.g., {@code Double}.
 */
public interface PrimitiveArray<ArrayType, BaseType> extends List<BaseType>,
	Sizable
{

	/**
	 * Gets the fixed-size array backing this instance.
	 * 
	 * @return the backing array
	 */
	ArrayType getArray();

	/**
	 * Sets the fixed-size array backing this instance.
	 * 
	 * @param array the new backing array
	 */
	void setArray(ArrayType array);

	/**
	 * Gets the maximal step size by which to grow the fixed-size array when
	 * running out of space.
	 */
	int getMaximumGrowth();

	/**
	 * Sets the maximal step size by which to grow the fixed-size array when
	 * running out of space.
	 */
	void setMaximumGrowth(int growth);

	/**
	 * Returns a copy of the primitive-array array.
	 * <p>
	 * The returned array is guaranteed to have {@link #size()} elements.
	 * </p>
	 * 
	 * @return the fixed-size array
	 */
	ArrayType copyArray();

	/** Gets the current capacity of the backing array. */
	int capacity();

	/**
	 * Makes sure the backing array at least a specified capacity.
	 * <p>
	 * After calling this method, the internal array will have at least
	 * {@code minCapacity} elements.
	 * </p>
	 * 
	 * @param minCapacity the minimum capacity
	 */
	void ensureCapacity(int minCapacity);

	/**
	 * Shifts the array to insert space at a specified index.
	 * 
	 * @param index the index where the space should be inserted
	 * @param count the number of values to insert
	 */
	void insert(int index, int count);

	/**
	 * Shifts the array to delete space starting at a specified index.
	 * 
	 * @param index the index where the space should be deleted
	 * @param count the number of values to delete
	 */
	void delete(int index, int count);

	BaseType defaultValue();
}
