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MessageEncoder.java
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55 lines (48 loc) · 1.48 KB
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/**
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby;
import io.jooby.exception.NotAcceptableException;
import javax.annotation.Nonnull;
import java.nio.charset.StandardCharsets;
/**
* Render a route output as byte array.
*
* @author edgar
* @since 2.0.0
*/
public interface MessageEncoder {
/** To string renderer. */
MessageEncoder TO_STRING = (ctx, value) -> {
if (ctx.accept(ctx.getResponseType())) {
return value.toString().getBytes(StandardCharsets.UTF_8);
}
throw new NotAcceptableException(ctx.header("Accept").valueOrNull());
};
/**
* MessageEncoder a value into a byte array or <code>null</code> if given object isn't supported it.
*
* @param ctx Web context.
* @param value Value to render.
* @return Value as byte array or <code>null</code> if given object isn't supported it.
* @throws Exception If something goes wrong.
*/
@Nonnull byte[] encode(@Nonnull Context ctx, @Nonnull Object value) throws Exception;
/**
* Execute this renderer only if the <code>Accept</code> header matches the content-type
* parameter.
*
* @param contentType Mediatype to test.
* @return A new renderer with accept header matching.
*/
@Nonnull default MessageEncoder accept(@Nonnull MediaType contentType) {
return (ctx, value) -> {
if (ctx.accept(contentType)) {
return encode(ctx, value);
}
return null;
};
}
}