io.bootique.mvc.AbstractViewWriter Maven / Gradle / Ivy
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Provides basic abstractions for web MVC in Bootique.
package io.bootique.mvc;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Objects;
import javax.inject.Provider;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import io.bootique.mvc.renderer.TemplateRendererFactory;
import io.bootique.mvc.resolver.TemplateResolver;
public class AbstractViewWriter implements MessageBodyWriter {
private TemplateResolver templateResolver;
private TemplateRendererFactory templateRendererFactory;
// TODO dirty ... other properties are set in constructor, but this one
// awaits injection. So the object is in a partial state for the part of its
// lifecycle...
@Context
private Provider resourceInfoProvider;
public AbstractViewWriter(TemplateResolver templateResolver, TemplateRendererFactory templateRendererFactory) {
this.templateResolver = templateResolver;
this.templateRendererFactory = templateRendererFactory;
}
@Override
public long getSize(AbstractView t, Class> type, Type genericType, Annotation[] annotations,
MediaType mediaType) {
return -1;
}
@Override
public boolean isWriteable(Class> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return AbstractView.class.isAssignableFrom(type);
}
@Override
public void writeTo(AbstractView t, Class> type, Type genericType, Annotation[] annotations, MediaType mediaType,
MultivaluedMap httpHeaders, OutputStream entityStream)
throws IOException, WebApplicationException {
// doublecheck injection....
Objects.requireNonNull(resourceInfoProvider, "'resourceInfoProvider' was not injected");
Writer out = new OutputStreamWriter(entityStream, t.getEncoding());
Template template = templateResolver.resolve(t.getTemplateName(), t.getClass());
templateRendererFactory.getRenderer(template).render(out, template, t);
// flush but do not close the underlying stream
out.flush();
}
}