| /* |
| * 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 org.apache.commons.functor.generator; |
| |
| import org.apache.commons.functor.UnaryProcedure; |
| import org.apache.commons.lang3.Validate; |
| |
| import java.util.Iterator; |
| |
| /** |
| * Adapts an {@link Iterator} to the {@link Generator} interface. |
| * |
| * @param <E> the type of elements held in this generator. |
| * @since 1.0 |
| * @version $Revision$ $Date$ |
| * @author Jason Horman (jason@jhorman.org) |
| * @author Rodney Waldhoff |
| */ |
| public final class IteratorToGeneratorAdapter<E> extends BaseGenerator<E> { |
| // instance variables |
| //----------------------------------------------------- |
| |
| /** |
| * The adapted iterator. |
| */ |
| private final Iterator<? extends E> iter; |
| |
| // constructors |
| //----------------------------------------------------- |
| /** |
| * Create a new IteratorToGeneratorAdapter. |
| * @param iter Iterator to adapt |
| */ |
| public IteratorToGeneratorAdapter(Iterator<? extends E> iter) { |
| this.iter = Validate.notNull(iter, "Iterator argument was null"); |
| } |
| |
| // instance methods |
| //----------------------------------------------------- |
| /** |
| * {@inheritDoc} |
| */ |
| public void run(UnaryProcedure<? super E> proc) { |
| while (iter.hasNext()) { |
| proc.run(iter.next()); |
| if (isStopped()) { |
| break; |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof IteratorToGeneratorAdapter<?>)) { |
| return false; |
| } |
| IteratorToGeneratorAdapter<?> that = (IteratorToGeneratorAdapter<?>) obj; |
| return this.iter.equals(that.iter); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public int hashCode() { |
| int hash = "IteratorToGeneratorAdapater".hashCode(); |
| hash <<= 2; |
| hash ^= iter.hashCode(); |
| return hash; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String toString() { |
| return "IteratorToGeneratorAdapter<" + iter + ">"; |
| } |
| |
| // static methods |
| //----------------------------------------------------- |
| /** |
| * Adapt an Iterator to the Generator interface. |
| * |
| * @param <E> the type of elements held in this generator. |
| * @param iter to adapt |
| * @return IteratorToGeneratorAdapter |
| */ |
| public static <E> IteratorToGeneratorAdapter<E> adapt(Iterator<? extends E> iter) { |
| return null == iter ? null : new IteratorToGeneratorAdapter<E>(iter); |
| } |
| |
| } |