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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*		 
 * Copyright (C) 2002-2015 Sebastiano Vigna
 *
 * 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 it.unimi.dsi.fastutil.bytes;

/** An abstract class facilitating the creation of type-specific {@linkplain it.unimi.dsi.fastutil.BidirectionalIterator bidirectional iterators}.
 *
 * To create a type-specific bidirectional iterator, besides what is needed for an iterator you need both a method returning the previous element as primitive type and a method returning the
 * previous element as an object. However, if you inherit from this class you need just one (anyone).
 *
 * This class implements also a trivial version of {@link #back(int)} that uses type-specific methods. */
public abstract class AbstractByteBidirectionalIterator extends AbstractByteIterator implements ByteBidirectionalIterator {
	protected AbstractByteBidirectionalIterator() {}

	/** Delegates to the corresponding generic method. */
	public byte previousByte() {
		return previous().byteValue();
	}

	/** Delegates to the corresponding type-specific method. */
	public Byte previous() {
		return Byte.valueOf( previousByte() );
	}

	/** This method just iterates the type-specific version of {@link #previous()} for at most n times, stopping if {@link #hasPrevious()} becomes false. */
	public int back( final int n ) {
		int i = n;
		while ( i-- != 0 && hasPrevious() )
			previousByte();
		return n - i - 1;
	}
}