it.unimi.dsi.fastutil.booleans.AbstractBooleanBidirectionalIterator Maven / Gradle / Ivy
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/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
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/* Abstract implementations (keys) */
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/* Methods (values) */
/* Methods (keys/values) */
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/*
* Copyright (C) 2002-2016 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.booleans;
/**
* 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 AbstractBooleanBidirectionalIterator
extends
AbstractBooleanIterator implements BooleanBidirectionalIterator {
protected AbstractBooleanBidirectionalIterator() {
}
/** Delegates to the corresponding generic method. */
public boolean previousBoolean() {
return previous().booleanValue();
}
/** Delegates to the corresponding type-specific method. */
public Boolean previous() {
return Boolean.valueOf(previousBoolean());
}
/**
* 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())
previousBoolean();
return n - i - 1;
}
}