| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.commons.functor.range; |
| |
| import java.util.Iterator; |
| |
| import org.apache.commons.functor.BinaryFunction; |
| import org.apache.commons.lang3.Validate; |
| |
| /** |
| * A range of longs. |
| * |
| * @since 1.0 |
| * @version $Revision: 1385335 $ $Date: 2012-09-16 15:08:31 -0300 (Sun, 16 Sep 2012) $ |
| */ |
| public final class LongRange extends NumericRange<Long> { |
| // attributes |
| //--------------------------------------------------------------- |
| |
| /** |
| * Current value. |
| */ |
| private long currentValue; |
| |
| /** |
| * Calculate default step. |
| */ |
| public static final BinaryFunction<Long, Long, Long> DEFAULT_STEP = new BinaryFunction<Long, Long, Long>() { |
| |
| public Long evaluate(Long left, Long right) { |
| return left > right ? -1L : 1L; |
| } |
| }; |
| |
| // constructors |
| // --------------------------------------------------------------- |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| */ |
| public LongRange(Number from, Number to) { |
| this(from.longValue(), to.longValue()); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| * @param step increment |
| */ |
| public LongRange(Number from, Number to, Number step) { |
| this(from.longValue(), to.longValue(), step.longValue()); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| */ |
| public LongRange(long from, long to) { |
| this(from, to, DEFAULT_STEP.evaluate(from, to).longValue()); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| * @param step increment |
| */ |
| public LongRange(long from, long to, long step) { |
| this(from, DEFAULT_LEFT_BOUND_TYPE, to, DEFAULT_RIGHT_BOUND_TYPE, step); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| * @throws NullPointerException if either {@link Endpoint} is {@code null} |
| */ |
| public LongRange(Endpoint<Long> from, Endpoint<Long> to) { |
| this(from, to, DEFAULT_STEP.evaluate(from.getValue(), to.getValue())); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| * @param step increment |
| * @throws NullPointerException if either {@link Endpoint} is {@code null} |
| */ |
| public LongRange(Endpoint<Long> from, Endpoint<Long> to, int step) { |
| this(from, to, (long) step); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param leftBoundType type of left bound |
| * @param to end |
| * @param rightBoundType type of right bound |
| * @throws NullPointerException if either {@link BoundType} is {@code null} |
| */ |
| public LongRange(long from, BoundType leftBoundType, long to, BoundType rightBoundType) { |
| this(from, leftBoundType, to, rightBoundType, DEFAULT_STEP.evaluate(from, to)); |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param to end |
| * @param step increment |
| * @throws NullPointerException if either {@link Endpoint} is {@code null} |
| */ |
| public LongRange(Endpoint<Long> from, Endpoint<Long> to, long step) { |
| super(from, to, Long.valueOf(step)); |
| final long f = from.getValue(); |
| final long t = to.getValue(); |
| |
| Validate.isTrue(f == t || Long.signum(step) == Long.signum(t - f), |
| "Will never reach '%s' from '%s' using step %s", t, f, step); |
| |
| if (from.getBoundType() == BoundType.CLOSED) { |
| this.currentValue = f; |
| } else { |
| this.currentValue = f + step; |
| } |
| } |
| |
| /** |
| * Create a new LongRange. |
| * |
| * @param from start |
| * @param leftBoundType type of left bound |
| * @param to end |
| * @param rightBoundType type of right bound |
| * @param step increment |
| * @throws NullPointerException if either {@link BoundType} is {@code null} |
| */ |
| public LongRange(long from, BoundType leftBoundType, long to, |
| BoundType rightBoundType, long step) { |
| this(new Endpoint<Long>(from, leftBoundType), new Endpoint<Long>(to, rightBoundType), step); |
| } |
| |
| // iterable, iterator methods |
| // --------------------------------------------------------------- |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean hasNext() { |
| final long to = this.rightEndpoint.getValue(); |
| if (step < 0) { |
| if (this.rightEndpoint.getBoundType() == BoundType.CLOSED) { |
| return this.currentValue >= to; |
| } else { |
| return this.currentValue > to; |
| } |
| } else { |
| if (this.rightEndpoint.getBoundType() == BoundType.CLOSED) { |
| return this.currentValue <= to; |
| } else { |
| return this.currentValue < to; |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Long next() { |
| final long step = this.getStep(); |
| final long r = this.currentValue; |
| this.currentValue += step; |
| return Long.valueOf(r); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Iterator<Long> iterator() { |
| return this; |
| } |
| |
| } |