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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.demo;
import com.yahoo.processing.Response;
import com.yahoo.processing.rendering.AsynchronousSectionedRenderer;
import com.yahoo.processing.response.Data;
import com.yahoo.processing.response.DataList;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
/**
* Render a response as plain text. First line is whether an error occurred,
* second rendering initialization time stamp, then each line is response data
* (indented according to its place in the hierarchic response), and the last
* line is time stamp for when the renderer was finished.
*/
public class DemoRenderer extends AsynchronousSectionedRenderer<Response> {
/**
* Indent size for rendering hierarchic response data.
*/
public static final int INDENT_SIZE = 4;
// Response heading
private String heading;
// Just a utility to write strings to output stream
private Writer writer;
// current indent in the rendered tree
String indent;
/**
* No global, shared state to set.
*/
public DemoRenderer() {
}
@Override
public void beginResponse(OutputStream stream) throws IOException {
writer = new OutputStreamWriter(stream, StandardCharsets.UTF_8.newEncoder());
if (getResponse().data().request().errors().size() == 0) {
writer.write("OK\n");
} else {
writer.write("Oops!\n");
}
writer.write(heading);
writer.write('\n');
}
/**
* Indent {@link #INDENT_SIZE} spaces for each level in the tree.
*/
@Override
public void beginList(DataList<?> list) throws IOException {
indent = spaces((getRecursionLevel() - 1) * INDENT_SIZE);
}
@Override
public void data(Data data) throws IOException {
if (!(data instanceof DataProcessor.DemoData)) {
return;
}
writer.write(indent);
writer.write(((DataProcessor.DemoData) data).content());
writer.write('\n');
}
private static String spaces(int len) {
StringBuilder s = new StringBuilder(len);
for (int i = 0; i < len; ++i) {
s.append(' ');
}
return s.toString();
}
/**
* Out-dent one level if not at outermost level.
*/
@Override
public void endList(DataList<?> list) throws IOException {
if (indent.length() == 0) {
return;
}
indent = spaces(indent.length() - INDENT_SIZE);
}
@Override
public void endResponse() throws IOException {
writer.write("Rendering finished work: " + System.currentTimeMillis());
writer.write('\n');
writer.close();
}
@Override
public String getEncoding() {
return StandardCharsets.UTF_8.name();
}
@Override
public String getMimeType() {
return "text/plain";
}
/**
* Initialize mutable, per-result set state here.
*/
@Override
public void init() {
long time = System.currentTimeMillis();
super.init(); // Important! The base class needs to initialize itself.
heading = "Renderer initialized: " + time;
}
}
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