org.rapidoid.datamodel.impl.PagingIterator Maven / Gradle / Ivy
package org.rapidoid.datamodel.impl;
/*
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.datamodel.PageableData;
import java.util.Iterator;
import java.util.List;
@Authors("Nikolche Mihajlovski")
@Since("5.1.0")
public class PagingIterator extends RapidoidThing implements Iterator {
private final PageableData data;
private List page;
private int offset;
private int pageLength;
private int index;
public PagingIterator(PageableData data) {
this(data, 100);
}
public PagingIterator(PageableData data, int pageLength) {
this.data = data;
this.pageLength = pageLength;
}
@Override
public boolean hasNext() {
if (page == null || index >= page.size()) {
page = data.getPage(offset, pageLength);
offset += page.size();
index = 0;
}
return index < page.size();
}
@Override
public T next() {
return page.get(index++);
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
}