ApacheCatalog (Apache Ant API)
Date: 2008-06-27

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## org.apache.tools.ant.types.resolver
Class ApacheCatalog

    java.lang.Object
      org.apache.xml.resolver.Catalog
          org.apache.tools.ant.types.resolver.ApacheCatalog

    public class ApacheCatalog

extends org.apache.xml.resolver.Catalog

This class extends the Catalog class provided by Norman Walsh's resolver library in xml-commons in order to add classpath entity and URI resolution. Since XMLCatalog already does classpath resolution, we simply add all CatalogEntry instances back to the controlling XMLCatalog instance. This is done via a callback mechanism. ApacheCatalog is only used for external catalog files. Inline entries (currently `<dtd>` and `<entity>`) are not added to ApacheCatalog. See XMLCatalog.java for the details of the entity and URI resolution algorithms.

Since:
  Ant 1.6
See Also:
  `XMLCatalog.CatalogResolver`

Field Summary

Fields inherited from class org.apache.xml.resolver.Catalog
`base, BASE, CATALOG, catalogCwd, catalogEntries, catalogFiles, catalogManager, catalogs, default_override, DELEGATE_PUBLIC, DELEGATE_SYSTEM, DELEGATE_URI, DOCTYPE, DOCUMENT, DTDDECL, ENTITY, LINKTYPE, localCatalogFiles, localDelegate, NOTATION, OVERRIDE, PUBLIC, readerArr, readerMap, REWRITE_SYSTEM, REWRITE_URI, SGMLDECL, SYSTEM, SYSTEM_SUFFIX, URI, URI_SUFFIX`

Constructor Summary
`ApacheCatalog()`

Method Summary
`void` | `addEntry(org.apache.xml.resolver.CatalogEntry entry)` This method overrides the superclass method of the same name in order to add catalog entries back to the controlling XMLCatalog instance.
`protected org.apache.xml.resolver.Catalog` | `newCatalog()` Create a new ApacheCatalog instance.
`void` | `setResolver(ApacheCatalogResolver resolver)` Set the resolver object to callback.

Methods inherited from class org.apache.xml.resolver.Catalog
`addDelegate, addReader, copyReaders, encodedByte, fixSlashes, getCatalogManager, getCurrentBase, getDefaultOverride, loadSystemCatalogs, makeAbsolute, normalizeURI, parseAllCatalogs, parseCatalog, parseCatalog, parseCatalog, parseCatalogFile, parsePendingCatalogs, resolveDoctype, resolveDocument, resolveEntity, resolveLocalPublic, resolveLocalSystem, resolveLocalURI, resolveNotation, resolvePublic, resolveSubordinateCatalogs, resolveSystem, resolveURI, setCatalogManager, setupReaders, unknownEntry`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ApacheCatalog

    public ApacheCatalog()

Method Detail

### newCatalog

    protected org.apache.xml.resolver.Catalog newCatalog()

  Create a new ApacheCatalog instance.

  This method overrides the superclass method of the same name in order to set the resolver object for callbacks. The reason we have to do this is that internally Catalog creates a new instance of itself for each external catalog file processed. That is, if two external catalog files are processed, there will be a total of two ApacheCatalog instances, and so on.

  Overrides:
    `newCatalog` in class `org.apache.xml.resolver.Catalog`
  Returns:
    the catalog.

### setResolver

    public void setResolver(ApacheCatalogResolver resolver)

  Set the resolver object to callback.

  Parameters:
    `resolver` - the apache catalog resolver.

### addEntry

    public void addEntry(org.apache.xml.resolver.CatalogEntry entry)

  This method overrides the superclass method of the same name in order to add catalog entries back to the controlling XMLCatalog instance. In this way, we can add classpath lookup for these entries.

  When we add an external catalog file, the entries inside it get parsed by this method. Therefore, we override it to add each of them back to the controlling XMLCatalog instance. This is done by performing a callback to the ApacheCatalogResolver, which in turn calls the XMLCatalog.

  XMLCatalog currently only understands `PUBLIC` and `URI` entry types, so we ignore the other types.

  Overrides:
    `addEntry` in class `org.apache.xml.resolver.Catalog`
  Parameters:
    `entry` - The CatalogEntry to process.

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