ch.qos.logback.core.html.HTMLLayoutBase Maven / Gradle / Ivy

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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2009, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.html;

import java.util.HashMap;
import java.util.Map;

import ch.qos.logback.core.Context;
import ch.qos.logback.core.CoreConstants;
import static ch.qos.logback.core.CoreConstants.LINE_SEPARATOR;
import ch.qos.logback.core.LayoutBase;
import ch.qos.logback.core.pattern.Converter;
import ch.qos.logback.core.pattern.ConverterUtil;
import ch.qos.logback.core.pattern.parser.Node;
import ch.qos.logback.core.pattern.parser.Parser;
import ch.qos.logback.core.pattern.parser.ScanException;

/**
 * This class is a base class for HTMLLayout classes part of
 * other logback modules such as logback-classic and logback-access.
 * 
 *
 * @author Sébastien Pennec
 */
public abstract class HTMLLayoutBase extends LayoutBase {

  protected String pattern;

  protected Converter head;

  protected String title = "Logback Log Messages";

  //It is the responsibility of derived classes to set
  //this variable in their constructor to a default value.
  protected CssBuilder cssBuilder;

   // counter keeping track of the rows output
  protected long counter = 0;
  
  /**
   * Set the ConversionPattern  option. This is the string which controls
   * formatting and consists of a mix of literal content and conversion
   * specifiers.
   */
  public void setPattern(String conversionPattern) {
    pattern = conversionPattern;
  }

  /**
   * Returns the value of the ConversionPattern  option.
   */
  public String getPattern() {
    return pattern;
  }

  public CssBuilder getCssBuilder() {
    return cssBuilder;
  }

  public void setCssBuilder(CssBuilder cssBuilder) {
    this.cssBuilder = cssBuilder;
  }

  /**
   * Parses the pattern and creates the Converter linked list.
   */
  @Override
  public void start() {
    int errorCount = 0;
    
    try {
      Parser p = new Parser(pattern);
      p.setContext(getContext());
      Node t = p.parse();
      this.head = p.compile(t, getEffectiveConverterMap());
      ConverterUtil.startConverters(this.head);
    } catch (ScanException ex) {
      addError("Incorrect pattern found", ex);
      errorCount++;
    }

    if (errorCount == 0) {
      super.started = true;
    }
  }
  
  protected abstract Map getDefaultConverterMap();

  
  /**
   * Returns a map where the default converter map is merged with the map
   * contained in the context.
   */
  public Map getEffectiveConverterMap() {
    Map effectiveMap = new HashMap();

    // add the least specific map fist
    Map defaultMap = getDefaultConverterMap();
    if (defaultMap != null) {
      effectiveMap.putAll(defaultMap);
    }

    // contextMap is more specific than the default map
    Context context = getContext();
    if (context != null) {
      @SuppressWarnings("unchecked")
      Map contextMap = (Map) context
          .getObject(CoreConstants.PATTERN_RULE_REGISTRY);
      if (contextMap != null) {
        effectiveMap.putAll(contextMap);
      }
    }
    return effectiveMap;
  }
  
  /**
   * The Title  option takes a String value. This option sets the
   * document title of the generated HTML document.
   * 
   * 
   * Defaults to 'Logback Log Messages'.
   */
  public void setTitle(String title) {
    this.title = title;
  }

  /**
   * Returns the current value of the Title  option.
   */
  public String getTitle() {
    return title;
  }

  /**
   * Returns the content type output by this layout, i.e "text/html".
   */
  @Override
  public String getContentType() {
    return "text/html";
  }

  /**
   * Returns appropriate HTML headers.
   */
  @Override
  public String getFileHeader() {
    StringBuilder sbuf = new StringBuilder();
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("  ");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("    ");
    sbuf.append(title);
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);
    
    cssBuilder.addCss(sbuf);
//    if (cssBuilder == null) {
//      DefaultCssBuilder.addDefaultCSS(sbuf);
//    } else {
//      cssBuilder.addExternalCSS(sbuf);
//    }
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("  ");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);

    return sbuf.toString();
  }
  
  public String getPresentationHeader() {
    StringBuilder sbuf = new StringBuilder();
    sbuf.append("
");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("Log session start time ");
    sbuf.append(new java.util.Date());
    sbuf.append("
");
    sbuf.append(LINE_SEPARATOR);
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);

    buildHeaderRowForTable(sbuf);
    
    return sbuf.toString();
  }


  private void buildHeaderRowForTable(StringBuilder sbuf) {
    Converter c = head;
    String name;
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);
    while (c != null) {
      name = computeConverterName(c);
      if (name == null) {
        c = c.getNext();
        continue;
      }
      sbuf.append("");
      sbuf.append(LINE_SEPARATOR);
      c = c.getNext();
    }
    sbuf.append("");
    sbuf.append(LINE_SEPARATOR);
  }
  
  public String getPresentationFooter() {
    StringBuilder sbuf = new StringBuilder();
    sbuf.append("");
      sbuf.append(computeConverterName(c));
      sbuf.append("");
    return sbuf.toString();    
  }

  /**
   * Returns the appropriate HTML footers.
   */
  @Override
  public String getFileFooter() {
    StringBuilder sbuf = new StringBuilder();
    sbuf.append(LINE_SEPARATOR);
    sbuf.append("");
    return sbuf.toString();
  }
  
  protected void startNewTableIfLimitReached(StringBuilder sbuf) {
    if (this.counter >= CoreConstants.TABLE_ROW_LIMIT) {
      counter = 0;
      sbuf.append("");
      sbuf.append(LINE_SEPARATOR);
      sbuf.append("");
      sbuf.append("");
      sbuf.append(LINE_SEPARATOR);
      buildHeaderRowForTable(sbuf);
    }
  }

  protected String computeConverterName(Converter c) {
    String className = c.getClass().getSimpleName();
    int index = className.indexOf("Converter");
    if (index == -1) {
      return className;
    } else {
      return className.substring(0, index);
    }
  }

}




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