src/main/java/org/takes/rs/RsPrettyJson.java
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2024 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.rs;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import javax.json.Json;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonWriter;
import javax.json.stream.JsonGenerator;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.takes.Response;
/**
* Response with properly indented JSON body.
*
* <p>The class is immutable and thread-safe.
*
* @since 1.0
*/
@ToString(of = "origin")
@EqualsAndHashCode
public final class RsPrettyJson implements Response {
/**
* Original response.
*/
private final Response origin;
/**
* Response with properly transformed body.
*/
private final List<Response> transformed;
/**
* Ctor.
* @param res Original response
*/
public RsPrettyJson(final Response res) {
this.transformed = new CopyOnWriteArrayList<>();
this.origin = res;
}
@Override
public Iterable<String> head() throws IOException {
return this.make().head();
}
@Override
public InputStream body() throws IOException {
return this.make().body();
}
/**
* Make a response.
* @return Response just made
* @throws IOException If fails
*/
private Response make() throws IOException {
if (this.transformed.isEmpty()) {
this.transformed.add(
new RsWithBody(
this.origin,
RsPrettyJson.transform(this.origin.body())
)
);
}
return this.transformed.get(0);
}
/**
* Format body with proper indents.
* @param body Response body
* @return New properly formatted body
* @throws IOException If fails
*/
private static byte[] transform(final InputStream body) throws IOException {
final ByteArrayOutputStream res = new ByteArrayOutputStream();
try (JsonReader rdr = Json.createReader(body)) {
final JsonObject obj = rdr.readObject();
try (JsonWriter wrt = Json.createWriterFactory(
Collections.singletonMap(JsonGenerator.PRETTY_PRINTING, true)
)
.createWriter(res)
) {
wrt.writeObject(obj);
}
} catch (final JsonException ex) {
throw new IOException(ex);
}
return res.toByteArray();
}
}