org.springframework.util.xml.ListBasedXMLEventReader Maven / Gradle / Ivy
/*
* Copyright 2002-2016 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.util.xml;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import javax.xml.stream.events.XMLEvent;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Implementation of {@code XMLEventReader} based on a list of {@link XMLEvent}s.
*
* @author Arjen Poutsma
* @since 5.0
*/
class ListBasedXMLEventReader extends AbstractXMLEventReader {
private final List events;
private int cursor = 0;
public ListBasedXMLEventReader(List events) {
Assert.notNull(events, "'events' must not be null");
this.events = Collections.unmodifiableList(events);
}
@Override
public boolean hasNext() {
return (this.cursor != this.events.size());
}
@Override
public XMLEvent nextEvent() {
if (this.cursor < this.events.size()) {
return this.events.get(this.cursor++);
}
else {
throw new NoSuchElementException();
}
}
@Override
@Nullable
public XMLEvent peek() {
if (this.cursor < this.events.size()) {
return this.events.get(this.cursor);
}
else {
return null;
}
}
@Override
public void close() {
super.close();
this.events.clear();
}
}