// Copyright 2007, 2008 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.internal.renderers;
import org.apache.tapestry5.MarkupWriter;
import org.apache.tapestry5.dom.Element;
import static org.apache.tapestry5.ioc.IOCConstants.PERTHREAD_SCOPE;
import org.apache.tapestry5.ioc.Location;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.ioc.annotations.Scope;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import org.apache.tapestry5.services.ObjectRenderer;
import java.io.*;
import java.util.Set;
/**
* Responsible for rendering a {@link Location}. It is designed to only perform the full output (which includes a
* snippet of the source file) once per render. This requires the use of the "perthread" scope (since the service
* tracks, internally, which locations have already been rendered, to avoid repetition).
*/
@Scope(PERTHREAD_SCOPE)
public class LocationRenderer implements ObjectRenderer<Location>
{
private static final int RANGE = 5;
private final Set<Location> rendered = CollectionFactory.newSet();
public void render(Location location, MarkupWriter writer)
{
writer.write(location.toString());
/** If the full details were already rendered this request, then skip the rest. */
if (rendered.contains(location)) return;
rendered.add(location);
Resource r = location.getResource();
int line = location.getLine();
// No line number? then nothing more to render.
if (line <= 0) return;
if (!r.exists()) return;
int start = line - RANGE;
int end = line + RANGE;
writer.element("table", "class", "t-location-outer");
LineNumberReader reader = null;
try
{
InputStream is = r.openStream();
InputStreamReader isr = new InputStreamReader(is);
reader = new LineNumberReader(new BufferedReader(isr));
while (true)
{
String input = reader.readLine();
if (input == null) break;
int current = reader.getLineNumber();
if (current < start) continue;
if (current > end) break;
writer.element("tr");
writer.element("td", "class", "t-location-line");
if (line == current) writer.getElement().addClassName("t-location-current");
writer.write(Integer.toString(current));
writer.end();
Element td = writer.element("td", "class", "t-location-content");
if (line == current) td.addClassName("t-location-current");
if (start == current) td.addClassName("t-location-content-first");
writer.write(input);
writer.end();
writer.end(); // tr
}
reader.close();
reader = null;
}
catch (IOException ex)
{
writer.write(ex.toString());
}
finally
{
InternalUtils.close(reader);
}
writer.end(); // div
}
}