com.netbout.client.RtBoutIterator Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2016, netbout.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are PROHIBITED without prior written permission from
* the author. This product may NOT be used anywhere and on any computer
* except the server platform of netbout Inc. located at www.netbout.com.
* Federal copyright law prohibits unauthorized reproduction by any means
* and imposes fines up to $25,000 for violation. If you received
* this code accidentally and without intent to use it, please report this
* incident to the author by email.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
package com.netbout.client;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.jcabi.aspects.Loggable;
import com.jcabi.http.Request;
import com.jcabi.http.response.RestResponse;
import com.jcabi.http.response.XmlResponse;
import com.jcabi.xml.XML;
import com.netbout.spi.Bout;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Queue;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* REST bout iterator.
*
* @author Yegor Bugayenko ([email protected])
* @version $Id: 99caf92aa5fe5c38a164276b90af6676db519e57 $
* @since 2.14
*/
@ToString
@Loggable(Loggable.DEBUG)
@EqualsAndHashCode(of = { "request", "bouts" })
final class RtBoutIterator implements Iterator {
/**
* Pre-fetched bouts.
*/
private final transient Queue bouts = new LinkedList();
/**
* Request to use.
*/
private transient Request request;
/**
* Has more?
*/
private transient boolean more = true;
/**
* Public ctor.
* @param req Request to use
*/
RtBoutIterator(final Request req) {
this.request = req;
}
@Override
public boolean hasNext() {
if (this.bouts.isEmpty() && this.more) {
try {
this.fetch();
} catch (final IOException ex) {
throw new IllegalStateException(ex);
}
}
return !this.bouts.isEmpty();
}
@Override
public Bout next() {
if (!this.hasNext()) {
throw new NoSuchElementException("end of inbox");
}
return this.bouts.poll();
}
@Override
public void remove() {
throw new UnsupportedOperationException("#remove()");
}
/**
* Fetch more.
* @throws IOException If fails
*/
private void fetch() throws IOException {
final XmlResponse response = this.request.fetch()
.as(RestResponse.class)
.assertStatus(HttpURLConnection.HTTP_OK)
.as(XmlResponse.class);
final XML xml = response.xml();
this.bouts.addAll(
Lists.transform(
xml.xpath("/page/bouts/bout/number/text()"),
new Function() {
@Override
public Bout apply(final String input) {
final long number = Long.parseLong(input);
return new RtBout(
number,
RtBoutIterator.this.request
.uri().path("/b")
.path(Long.toString(number))
.back()
);
}
}
)
);
if (xml.nodes("/page/bouts/bout").isEmpty()) {
this.more = false;
} else {
this.request = response.rel(
"/page/bouts/bout[last()]/links/link[@rel='more']/@href"
);
}
}
}