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EpubCheck is a tool to validate IDPF EPUB files. It can detect many types of errors in EPUB. OCF container structure, OPF and OPS mark-up, and internal reference consistency are checked. EpubCheck can be run as a standalone command-line tool, installed as a Java server-side web application or used as a Java library.

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package com.adobe.epubcheck.nav;

import java.util.Set;

import com.adobe.epubcheck.opf.ValidationContext;
import com.adobe.epubcheck.ops.OPSHandler30;
import com.adobe.epubcheck.util.FeatureEnum;
import com.adobe.epubcheck.vocab.StructureVocab.EPUB_TYPES;
import com.adobe.epubcheck.xml.XMLElement;
import com.adobe.epubcheck.xml.XMLParser;

public class NavHandler extends OPSHandler30
{

  private boolean inToc = false;

  NavHandler(ValidationContext context, XMLParser parser)
  {
    super(context, parser);
  }

  @Override
  public void startElement()
  {
    super.startElement();
    XMLElement e = parser.getCurrentElement();
    String name = e.getName();
    if (inToc && "a".equals(name))
    {
      context.featureReport.report(FeatureEnum.TOC_LINKS, parser.getLocation());
    }
  }

  @Override
  public void endElement()
  {
    super.endElement();
    XMLElement e = parser.getCurrentElement();
    String name = e.getName();
    if (inToc && "nav".equals(name))
    {
      inToc = false;
    }
  }

  protected void checkTypes(Set types)
  {
    super.checkTypes(types);
    if (types.contains(EPUB_TYPES.TOC))
    {
      inToc = true;
    }
    if (types.contains(EPUB_TYPES.PAGE_LIST))
    {
      context.featureReport.report(FeatureEnum.PAGE_LIST, parser.getLocation());
    }
    if (types.contains(EPUB_TYPES.LOI))
    {
      context.featureReport.report(FeatureEnum.LOI, parser.getLocation());
    }
    if (types.contains(EPUB_TYPES.LOT))
    {
      context.featureReport.report(FeatureEnum.LOT, parser.getLocation());
    }
    if (types.contains(EPUB_TYPES.LOA))
    {
      context.featureReport.report(FeatureEnum.LOA, parser.getLocation());
    }
    if (types.contains(EPUB_TYPES.LOV))
    {
      context.featureReport.report(FeatureEnum.LOV, parser.getLocation());
    }
  }

}