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TkForward.java
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TkForward.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.facets.forward;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.takes.Request;
import org.takes.Response;
import org.takes.Take;
import org.takes.rs.RsSimple;
/**
* Redirect on exception.
*
* <p>The class is immutable and thread-safe.
*
* @since 0.1
* @see org.takes.facets.forward.TkForward
*/
@ToString(of = "origin")
@EqualsAndHashCode
public final class TkForward implements Take {
/**
* Original take.
*/
private final Take origin;
/**
* Ctor.
* @param take Original
*/
public TkForward(final Take take) {
this.origin = take;
}
@Override
public Response act(final Request req) throws IOException {
Response res;
try {
res = this.origin.act(req);
} catch (final RsForward ex) {
res = ex;
}
return new TkForward.Safe(res);
}
/**
* Safe response.
*/
@ToString(of = { "origin", "saved" })
private static final class Safe implements Response {
/**
* Original response.
*/
private final Response origin;
/**
* Saved response.
*/
private final List<Response> saved;
/**
* Ctor.
* @param res Original response
*/
private Safe(final Response res) {
this.origin = res;
this.saved = new CopyOnWriteArrayList<>();
}
@Override
public Iterable<String> head() throws IOException {
return this.load().head();
}
@Override
public InputStream body() throws IOException {
return this.load().body();
}
/**
* Load it.
* @return Response
* @throws IOException If fails
*/
private Response load() throws IOException {
if (this.saved.isEmpty()) {
Iterable<String> head;
InputStream body;
try {
head = this.origin.head();
body = this.origin.body();
} catch (final RsForward ex) {
head = ex.head();
body = ex.body();
}
this.saved.add(new RsSimple(head, body));
}
return this.saved.get(0);
}
}
}