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package org.apache.tapestry.describe; |
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import org.apache.hivemind.Location; |
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import org.apache.tapestry.IMarkupWriter; |
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import org.apache.tapestry.IRequestCycle; |
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import java.io.*; |
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import java.net.URL; |
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public class LocationRenderStrategy implements RenderStrategy |
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{ |
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private static final int RANGE = 5; |
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public void renderObject(Object object, IMarkupWriter writer, |
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IRequestCycle cycle) |
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{ |
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Location l = (Location) object; |
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writer.print(l.toString()); |
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int lineNumber = l.getLineNumber(); |
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if (lineNumber < 1) |
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return; |
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URL url = l.getResource().getResourceURL(); |
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if (url == null) |
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return; |
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writeResourceContent(writer, url, lineNumber); |
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} |
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private void writeResourceContent(IMarkupWriter writer, URL url, int lineNumber) |
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{ |
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LineNumberReader reader = null; |
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try |
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{ |
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reader = new LineNumberReader(new BufferedReader( new InputStreamReader(url.openStream()))); |
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writer.beginEmpty("br"); |
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writer.begin("table"); |
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writer.attribute("class", "location-content"); |
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writer.attribute("cellspacing", "0"); |
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writer.attribute("cellpadding", "0"); |
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while(true) |
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{ |
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String line = reader.readLine(); |
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if (line == null) |
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break; |
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int currentLine = reader.getLineNumber(); |
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if (currentLine > lineNumber + RANGE) |
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break; |
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if (currentLine < lineNumber - RANGE) |
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continue; |
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writer.begin("tr"); |
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if (currentLine == lineNumber) |
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writer.attribute("class", "target-line"); |
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writer.begin("td"); |
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writer.attribute("class", "line-number"); |
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writer.print(currentLine); |
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writer.end(); |
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writer.begin("td"); |
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String spacers = extractWhitespaceStart(line); |
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if (spacers != null && spacers.length() > 0) |
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{ |
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writer.printRaw(spacers); |
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} |
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writer.print(line); |
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writer.end("tr"); |
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writer.println(); |
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} |
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reader.close(); |
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reader = null; |
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} |
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catch (Exception ex) |
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{ |
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} |
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finally |
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{ |
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writer.end("table"); |
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close(reader); |
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} |
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} |
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String extractWhitespaceStart(String input) |
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{ |
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if (input == null || input.length() < 1) |
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return null; |
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char[] vals = input.toCharArray(); |
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StringBuffer ret = new StringBuffer(); |
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for (int i=0; i < vals.length; i++) |
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{ |
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if (Character.isWhitespace(vals[i])) |
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{ |
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ret.append(" "); |
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continue; |
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} |
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if (vals[i] == '\t') |
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{ |
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ret.append(" "); |
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continue; |
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} |
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break; |
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} |
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return ret.toString(); |
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} |
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private void close(Reader reader) |
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{ |
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try |
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{ |
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if (reader != null) |
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reader.close(); |
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} |
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catch (IOException ex) |
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{ |
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} |
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} |
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} |