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package org.glassfish.jersey.examples.sparklines;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.math.BigInteger;
import java.net.URI;
import java.security.MessageDigest;
import java.util.Collections;
import java.util.List;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.EntityTag;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
/**
* @author Paul Sandoz
*/
@Path("/")
@Produces("image/png")
public class SparklinesResource {
List<Integer> data;
@DefaultValue("20")
@QueryParam("height")
int imageHeight;
org.glassfish.jersey.examples.sparklines.Interval limits;
EntityTag tag;
public SparklinesResource(
@QueryParam("d") final IntegerList data,
@DefaultValue("0,100") @QueryParam("limits") final Interval limits,
@Context final Request request,
@Context final UriInfo ui) {
if (data == null) {
throw new WebApplicationException(400);
}
this.data = data;
this.limits = limits;
if (!limits.contains(data)) {
throw new WebApplicationException(400);
}
this.tag = computeEntityTag(ui.getRequestUri());
if ("GET".equals(request.getMethod())) {
final Response.ResponseBuilder rb = request.evaluatePreconditions(tag);
if (rb != null) {
throw new WebApplicationException(rb.build());
}
}
}
@Path("discrete")
@GET
public Response discrete(
@DefaultValue("2") @QueryParam("width") final int width,
@DefaultValue("50") @QueryParam("upper") final int upper,
@DefaultValue("red") @QueryParam("upper-color") final ColorParam upperColor,
@DefaultValue("gray") @QueryParam("lower-color") final ColorParam lowerColor
) {
final BufferedImage image = new BufferedImage(
data.size() * width - 1, imageHeight, BufferedImage.TYPE_INT_RGB);
final Graphics2D g = image.createGraphics();
g.setBackground(Color.WHITE);
g.clearRect(0, 0, image.getWidth(), image.getHeight());
final int gap = 4;
final float d = (limits.width() + 1) / (float) (imageHeight - gap);
for (int i = 0, x = 0, y; i < data.size(); i++, x += width) {
final int v = data.get(i);
g.setColor((v >= upper) ? upperColor : lowerColor);
y = imageHeight - (int) ((v - limits.lower()) / d);
g.drawRect(x, y - gap, width - 2, gap);
}
return Response.ok(image).tag(tag).build();
}
@Path("smooth")
@GET
public Response smooth(
@DefaultValue("2") @QueryParam("step") final int step,
@DefaultValue("true") @QueryParam("min-m") final boolean hasMin,
@DefaultValue("true") @QueryParam("max-m") final boolean hasMax,
@DefaultValue("true") @QueryParam("last-m") final boolean hasLast,
@DefaultValue("blue") @QueryParam("min-color") final ColorParam minColor,
@DefaultValue("green") @QueryParam("max-color") final ColorParam maxColor,
@DefaultValue("red") @QueryParam("last-color") final ColorParam lastColor
) {
final BufferedImage image = new BufferedImage(
data.size() * step - 4, imageHeight, BufferedImage.TYPE_INT_RGB);
final Graphics2D g = image.createGraphics();
g.setBackground(Color.WHITE);
g.clearRect(0, 0, image.getWidth(), image.getHeight());
g.setColor(Color.gray);
final int[] xs = new int[data.size()];
final int[] ys = new int[data.size()];
final int gap = 4;
final float d = (limits.width() + 1) / (float) (imageHeight - gap);
for (int i = 0, x = 0; i < data.size(); i++, x += step) {
final int v = data.get(i);
xs[i] = x;
ys[i] = imageHeight - 3 - (int) ((v - limits.lower()) / d);
}
g.drawPolyline(xs, ys, data.size());
if (hasMin) {
final int i = data.indexOf(Collections.min(data));
g.setColor(minColor);
g.fillRect(xs[i] - step / 2, ys[i] - step / 2, step, step);
}
if (hasMax) {
final int i = data.indexOf(Collections.max(data));
g.setColor(maxColor);
g.fillRect(xs[i] - step / 2, ys[i] - step / 2, step, step);
}
if (hasMax) {
g.setColor(lastColor);
g.fillRect(xs[xs.length - 1] - step / 2, ys[ys.length - 1] - step / 2, step, step);
}
return Response.ok(image).tag(tag).build();
}
private EntityTag computeEntityTag(final URI u) {
return new EntityTag(
computeDigest(u.getRawPath() + u.getRawQuery()));
}
private String computeDigest(final String content) {
try {
final MessageDigest md = MessageDigest.getInstance("SHA");
final byte[] digest = md.digest(content.getBytes("UTF-8"));
final BigInteger bi = new BigInteger(digest);
return bi.toString(16);
} catch (final Exception e) {
return "";
}
}
}