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147 changes: 73 additions & 74 deletions
147
...frastructure/src/main/java/org/springframework/batch/item/support/IteratorItemReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,74 +1,73 @@ | ||
| /* | ||
| * Copyright 2006-2007 the original author or authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.springframework.batch.item.support; | ||
|
|
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| import java.util.Iterator; | ||
|
|
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| import org.springframework.batch.item.ItemReader; | ||
| import org.springframework.batch.item.ParseException; | ||
| import org.springframework.batch.item.UnexpectedInputException; | ||
| import org.springframework.util.Assert; | ||
|
|
||
| /** | ||
| * An {@link ItemReader} that pulls data from a {@link Iterator} or | ||
| * {@link Iterable} using the constructors. | ||
| * | ||
| * @author Juliusz Brzostek | ||
| * @author Dave Syer | ||
| */ | ||
| public class IteratorItemReader<T> implements ItemReader<T> { | ||
|
|
||
| /** | ||
| * Internal iterator | ||
| */ | ||
| private final Iterator<T> iterator; | ||
|
|
||
| /** | ||
| * Construct a new reader from this iterable (could be a collection), by | ||
| * extracting an instance of {@link Iterator} from it. | ||
| * | ||
| * @param iterable in instance of {@link Iterable} | ||
| * | ||
| * @see Iterable#iterator() | ||
| */ | ||
| public IteratorItemReader(Iterable<T> iterable) { | ||
| Assert.notNull(iterable, "Iterable argument cannot be null!"); | ||
| this.iterator = iterable.iterator(); | ||
| } | ||
|
|
||
| /** | ||
| * Construct a new reader from this iterator directly. | ||
| * @param iterator an instance of {@link Iterator} | ||
| */ | ||
| public IteratorItemReader(Iterator<T> iterator) { | ||
| Assert.notNull(iterator, "Iterator argument cannot be null!"); | ||
| this.iterator = iterator; | ||
| } | ||
|
|
||
| /** | ||
| * Implementation of {@link ItemReader#read()} that just iterates over the | ||
| * iterator provided. | ||
| */ | ||
| @Override | ||
| public T read() { | ||
| if (iterator.hasNext()) | ||
| return iterator.next(); | ||
| else | ||
| return null; // end of data | ||
| } | ||
|
|
||
| } | ||
| /* | ||
| * Copyright 2006-2019 the original author or authors. | ||
| * | ||
| * 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.springframework.batch.item.support; | ||
|
|
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| import java.util.Iterator; | ||
|
|
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| import org.springframework.batch.item.ItemReader; | ||
| import org.springframework.util.Assert; | ||
|
|
||
| /** | ||
| * An {@link ItemReader} that pulls data from a {@link Iterator} or | ||
| * {@link Iterable} using the constructors. | ||
| * | ||
| * @author Juliusz Brzostek | ||
| * @author Dave Syer | ||
| * @author Mahmoud Ben Hassine | ||
| */ | ||
| public class IteratorItemReader<T> implements ItemReader<T> { | ||
|
|
||
| /** | ||
| * Internal iterator | ||
| */ | ||
| private final Iterator<T> iterator; | ||
|
|
||
| /** | ||
| * Construct a new reader from this iterable (could be a collection), by | ||
| * extracting an instance of {@link Iterator} from it. | ||
| * | ||
| * @param iterable in instance of {@link Iterable} | ||
| * | ||
| * @see Iterable#iterator() | ||
| */ | ||
| public IteratorItemReader(Iterable<T> iterable) { | ||
| Assert.notNull(iterable, "Iterable argument cannot be null!"); | ||
| this.iterator = iterable.iterator(); | ||
| } | ||
|
|
||
| /** | ||
| * Construct a new reader from this iterator directly. | ||
| * @param iterator an instance of {@link Iterator} | ||
| */ | ||
| public IteratorItemReader(Iterator<T> iterator) { | ||
| Assert.notNull(iterator, "Iterator argument cannot be null!"); | ||
| this.iterator = iterator; | ||
| } | ||
|
|
||
| /** | ||
| * Implementation of {@link ItemReader#read()} that just iterates over the | ||
| * iterator provided. | ||
| */ | ||
| @Override | ||
| public T read() { | ||
| if (iterator.hasNext()) | ||
| return iterator.next(); | ||
| else | ||
| return null; // end of data | ||
| } | ||
|
|
||
| } |
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