@@ -54,6 +54,8 @@
package org.apache.tools.ant.types;
import java.lang.reflect.Method;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
@@ -72,6 +74,7 @@ import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.util.FileUtils;
import org.xml.sax.EntityResolver;
@@ -138,13 +141,14 @@ import org.xml.sax.XMLReader;
* @author <a href="mailto:cstrong@arielpartners.com">Craeg Strong</a>
* @version $Id$
*/
public class XMLCatalog extends DataType implements Cloneable, EntityResolver, URIResolver {
public class XMLCatalog extends DataType
implements Cloneable, EntityResolver, URIResolver {
/** File utilities instance */
private FileUtils fileUtils = FileUtils.newFileUtils();
//-- Fields ----------------------------------------------------------------
/** holds dtd/entity objects until needed */
/** Holds dtd/entity objects and catalog filesets until needed. */
private Vector elements = new Vector();
/**
@@ -152,6 +156,14 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
*/
private Path classpath;
/**
* The name of the bridge to the Apache xml-commons resolver
* class, used to determine whether resolver.jar is present in the
* classpath.
*/
public static final String APACHE_RESOLVER
= "org.apache.tools.ant.types.resolver.ApacheCatalogResolver";
//-- Methods ---------------------------------------------------------------
public XMLCatalog() {
@@ -159,9 +171,11 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Returns the elements of the catalog - DTDLocation objects.
* Returns the elements of the catalog - ResolverLocation and FileSet
* objects.
*
* @return the elements of the catalog - DTDLocation objects
* @return the elements of the catalog - ResolverLocation and FileSet
* objects
*/
private Vector getElements() {
return elements;
@@ -177,14 +191,18 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Set the list of DTDLocation objects in the catalog. Not
* allowed if this catalog is itself a reference to another
* catalog -- that is, a catalog cannot both refer to another
* <em>and</em> contain elements or other attributes.
* Set the list of ResourceLocation objects and FileSets in the catalog.
* Not allowed if this catalog is itself a reference to another catalog --
* that is, a catalog cannot both refer to another <em>and</em> contain
* elements or other attributes.
*
* @param aVector the new list of DTD Locations to use in the catalog.
* @param aVector the new list of ResourceLocations and FileSets
* to use in the catalog.
*/
private void setElements(Vector aVector) {
if (isReference()) {
throw noChildrenAllowed();
}
elements = aVector;
}
@@ -237,6 +255,22 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
setChecked( false );
}
/** Creates the nested <code><catalogfiles></code> element. Not
* allowed if this catalog is itself a reference to another catalog -- that
* is, a catalog cannot both refer to another <em>and</em> contain elements
* or other attributes.
*
* @param fs the fileset of external catalogs.
* @exception BuildException
* if this is a reference and no nested elements are allowed.
*/
public void addCatalogfiles(FileSet fs) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
getElements().addElement(fs);
}
/**
* Creates the nested <code><dtd></code> element. Not
* allowed if this catalog is itself a reference to another
@@ -248,7 +282,7 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
* @exception BuildException if this is a reference and no nested
* elements are allowed.
*/
public void addDTD(DTD Location dtd) throws BuildException {
public void addDTD(Resource Location dtd) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
@@ -256,6 +290,9 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
getElements().addElement(dtd);
setChecked( false );
}
public void addDTD(DTDLocation dtd) throws BuildException {
addDTD((ResourceLocation)dtd);
}
/**
* Creates the nested <code><entity></code> element. Not
@@ -263,13 +300,34 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
* catalog -- that is, a catalog cannot both refer to another
* <em>and</em> contain elements or other attributes.
*
* @param dtd the information about the URI resource mapping to be
* added to the catalog
* @param entity the information about the URI resource mapping to
* be added to the catalog.
* @exception BuildException if this is a reference and no nested
* elements are allowed.
*/
public void addEntity(DTDLocation dtd) throws BuildException {
addDTD(dtd);
public void addEntity(EntityLocation entity) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
getElements().addElement(entity);
}
/**
* Creates the nested <code><entity></code> element. Not
* allowed if this catalog is itself a reference to another
* catalog -- that is, a catalog cannot both refer to another
* <em>and</em> contain elements or other attributes.
*
* @param entity the information about the URI resource mapping to
* be added to the catalog.
* @exception BuildException if this is a reference and no nested
* elements are allowed.
*/
public void addEntity(DTDLocation entity) throws BuildException {
if (isReference()) {
throw noChildrenAllowed();
}
getElements().addElement(entity);
}
/**
@@ -337,17 +395,18 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException, IOException {
if (!isChecked()) {
// make sure we don't have a circular reference here
Stack stk = new Stack();
stk.push(this);
dieOnCircularReference(stk, getProject());
}
if (!isChecked()) {
// make sure we don't have a circular reference here
Stack stk = new Stack();
stk.push(this);
dieOnCircularReference(stk, getProject());
}
log("resolveEntity: '" + publicId + "': '" + systemId + "'",
Project.MSG_DEBUG);
InputSource inputSource = resolveEntityImpl(publicId );
InputSource inputSource =
getCatalogResolver().resolveEntity(publicId, systemId);
if (inputSource == null) {
log("No matching catalog entry found, parser will use: '" +
@@ -365,12 +424,12 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
public Source resolve(String href, String base)
throws TransformerException {
if (!isChecked()) {
// make sure we don't have a circular reference here
Stack stk = new Stack();
stk.push(this);
dieOnCircularReference(stk, getProject());
}
if (!isChecked()) {
// make sure we don't have a circular reference here
Stack stk = new Stack();
stk.push(this);
dieOnCircularReference(stk, getProject());
}
SAXSource source = null;
@@ -389,11 +448,11 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
//
source = new SAXSource();
try
{
URL baseURL = new URL(base);
URL url = (uri.length() == 0 ? baseURL : new URL(baseURL, uri));
source.setInputSource(new InputSource(url.toString()));
}
{
URL baseURL = new URL(base);
URL url = (uri.length() == 0 ? baseURL : new URL(baseURL, uri));
source.setInputSource(new InputSource(url.toString()));
}
catch (MalformedURLException ex) {
// At this point we are probably in failure mode, but
// try to use the bare URI as a last gasp
@@ -406,25 +465,67 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Find a DTDLocation instance for the given publicId.
* The instance of the CatalogResolver strategy to use.
*/
private static CatalogResolver catalogResolver = null;
/**
* Factory method for creating the appropriate CatalogResolver
* strategy implementation.
* <p> Until we query the classpath, we don't know whether the Apache
* resolver (Norm Walsh's library from xml-commons) is available or not.
* This method determines whether the library is available and creates the
* appropriate implementation of CatalogResolver based on the answer.</p>
* <p>This is an application of the Gang of Four Strategy Pattern
* combined with Template Method.</p>
*
* @param publicId the publicId of the Resource for which local information
* is required
* @return a DTDLocation instance with information on the local location
* @return a Resource Location instance with information on the local location
* of the Resource or null if no such information is available
*/
private DTDLocation findMatchingEntry(String publicId) {
Enumeration elements = getElements().elements();
DTDLocation element = null;
while (elements.hasMoreElements()) {
element = (DTDLocation) elements.nextElement();
if (element.getPublicId().equals(publicId)) {
return element;
private CatalogResolver getCatalogResolver() {
if (catalogResolver == null) {
AntClassLoader loader = null;
loader = new AntClassLoader(project, Path.systemClasspath);
try {
Class clazz = loader.forceLoadSystemClass(APACHE_RESOLVER);
Object obj = clazz.newInstance();
//
// Success! The xml-commons resolver library is
// available, so use it.
//
catalogResolver = new ApacheResolver(clazz, obj);
}
catch (Throwable ex) {
//
// The xml-commons resolver library is not
// available, so we can't use it.
//
catalogResolver = new InternalResolver();
//
// If any <catalogfiles> are specified, warn that they
// will be ignored.
//
Enumeration enum = getElements().elements();
while (enum.hasMoreElements()) {
Object o = enum.nextElement();
if (o instanceof FileSet) {
log("Warning: External catalogfiles will be ignored",
Project.MSG_WARN);
break;
}
}
}
}
return null;
return catalogResolver ;
}
/**
* <p>This is called from the URIResolver to set an EntityResolver
* on the SAX parser to be used for new XML documents that are
@@ -464,6 +565,29 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
source.setXMLReader(reader);
}
/**
* Find a ResourceLocation instance for the given publicId.
*
* @param publicId the publicId of the Resource for which local information is
* required.
* @return a ResourceLocation instance with information on the local location
* of the Resource or null if no such information is available.
*/
private ResourceLocation findMatchingEntry(String publicId) {
Enumeration enum = getElements().elements();
ResourceLocation element = null;
while (enum.hasMoreElements()) {
Object o = enum.nextElement();
if (o instanceof ResourceLocation) {
element = (ResourceLocation)o;
if (element.getPublicId().equals(publicId)) {
return element;
}
}
}
return null;
}
/**
* Utility method to remove trailing fragment from a URI.
* For example,
@@ -484,17 +608,17 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Utility method to lookup a DTD Location in the filesystem.
* Utility method to lookup a Resource Location in the filesystem.
*
* @return An InputSource for reading the file, or <code>null</code>
* if the file does not exist or is not readable.
*/
private InputSource filesystemLookup(DTD Location matchingEntry) {
private InputSource filesystemLookup(Resource Location matchingEntry) {
String uri = matchingEntry.getLocation();
//
// The DTD Location may specify a relative path for its
// The Resource Location may specify a relative path for its
// location attribute. This is resolved using the appropriate
// base.
//
@@ -522,12 +646,12 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Utility method to lookup a DTD Location in the classpath.
* Utility method to lookup a Resource Location in the classpath.
*
* @return An InputSource for reading the resource, or <code>null</code>
* if the resource does not exist in the classpath or is not readable.
*/
private InputSource classpathLookup(DTD Location matchingEntry) {
private InputSource classpathLookup(Resource Location matchingEntry) {
InputSource source = null;
@@ -557,7 +681,7 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
/**
* Utility method to lookup a DTD Location in URL-space.
* Utility method to lookup a Resource Location in URL-space.
*
* @return An InputSource for reading the resource, or <code>null</code>
* if the resource does not identify a valid URL or is not readable.
@@ -602,31 +726,33 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
/**
* Implements the guts of the resolveEntity() lookup strategy.
*/
private InputSource resolveEntityImpl(String publicId) {
/*
private InputSource resolveEntityImpl(String publicId) {
InputSource result = null;
InputSource result = null;
DTD Location matchingEntry = findMatchingEntry(publicId);
Resource Location matchingEntry = findMatchingEntry(publicId);
if (matchingEntry != null) {
if (matchingEntry != null) {
log("Matching catalog entry found for publicId: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
log("Matching catalog entry found for publicId: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
result = filesystemLookup(matchingEntry);
result = filesystemLookup(matchingEntry);
if (result == null) {
result = classpathLookup(matchingEntry);
}
if (result == null) {
result = classpathLookup(matchingEntry);
}
if (result == null) {
result = urlLookup(matchingEntry.getLocation(), null);
}
}
return result;
}
if (result == null) {
result = urlLookup(matchingEntry.getLocation(), null);
}
}
return result;
}
*/
/**
* Implements the guts of the resolve() lookup strategy.
@@ -636,7 +762,7 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
SAXSource result = null;
InputSource source = null;
DTD Location matchingEntry = findMatchingEntry(href);
Resource Location matchingEntry = findMatchingEntry(href);
if (matchingEntry != null) {
@@ -661,4 +787,312 @@ public class XMLCatalog extends DataType implements Cloneable, EntityResolver, U
}
return result;
}
/**
* Interface implemented by both the InternalResolver strategy and
* the ApacheResolver strategy.
*/
private interface CatalogResolver extends URIResolver, EntityResolver {
InputSource resolveEntity(String publicId, String systemId);
Source resolve(String href, String base) throws TransformerException;
}
/**
* The InternalResolver strategy is used if the Apache resolver
* library (Norm Walsh's library from xml-commons) is not
* available. In this case, external catalog files will be
* ignored.
*
*/
private class InternalResolver implements CatalogResolver {
public InternalResolver() {
log("Apache resolver library not found, internal resolver will be used",
Project.MSG_INFO);
}
public InputSource resolveEntity(String publicId,
String systemId) {
InputSource result = null;
ResourceLocation matchingEntry = findMatchingEntry(publicId);
if (matchingEntry != null) {
log("Matching catalog entry found for publicId: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
result = filesystemLookup(matchingEntry);
if (result == null) {
result = classpathLookup(matchingEntry);
}
if (result == null) {
result = urlLookup(matchingEntry.getLocation(), null);
}
}
return result;
}
public Source resolve(String href, String base)
throws TransformerException {
SAXSource result = null;
InputSource source = null;
ResourceLocation matchingEntry = findMatchingEntry(href);
if (matchingEntry != null) {
log("Matching catalog entry found for uri: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
source = filesystemLookup(matchingEntry);
if (source == null) {
source = classpathLookup(matchingEntry);
}
if (source == null) {
source = urlLookup(matchingEntry.getLocation(), base);
}
if (source != null) {
result = new SAXSource(source);
}
}
return result;
}
}
/**
* The ApacheResolver strategy is used if the Apache resolver
* library (Norm Walsh's library from xml-commons) is available in
* the classpath. The ApacheResolver is a essentially a superset
* of the InternalResolver.
*
*/
private class ApacheResolver implements CatalogResolver {
private Method setXMLCatalog = null;
private Method parseCatalog = null;
private Method resolveEntity = null;
private Method resolve = null;
/** The instance of the ApacheCatalogResolver bridge class */
private Object resolverImpl = null;
private boolean externalCatalogsProcessed = false;
public ApacheResolver(Class resolverImplClass,
Object resolverImpl) {
this.resolverImpl = resolverImpl;
//
// Get Method instances for each of the methods we need to
// call on the resolverImpl using reflection. We can't
// call them directly, because they require on the
// xml-commons resolver library which may not be available
// in the classpath.
//
try {
setXMLCatalog =
resolverImplClass.getMethod("setXMLCatalog",
new Class[]
{ XMLCatalog.class });
parseCatalog =
resolverImplClass.getMethod("parseCatalog",
new Class[]
{ String.class });
resolveEntity =
resolverImplClass.getMethod("resolveEntity",
new Class[]
{ String.class, String.class });
resolve =
resolverImplClass.getMethod("resolve",
new Class[]
{ String.class, String.class });
}
catch (NoSuchMethodException ex) {
throw new BuildException(ex);
}
log("Apache resolver library found, xml-commons resolver will be used",
Project.MSG_INFO);
}
public InputSource resolveEntity(String publicId,
String systemId) {
InputSource result = null;
processExternalCatalogs();
ResourceLocation matchingEntry = findMatchingEntry(publicId);
if (matchingEntry != null) {
log("Matching catalog entry found for publicId: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
result = filesystemLookup(matchingEntry);
if (result == null) {
result = classpathLookup(matchingEntry);
}
if (result == null) {
try {
result =
(InputSource)resolveEntity.invoke(resolverImpl,
new Object[]
{ publicId, systemId });
}
catch (Exception ex) {
throw new BuildException(ex);
}
}
}
else {
//
// We didn't match a ResourceLocation, but since we
// only support PUBLIC and URI entry types, it is
// still possible that there is another entry in an
// external catalog that will match. We call Apache
// resolver's resolveEntity method to cover this
// possibility.
//
try {
result =
(InputSource)resolveEntity.invoke(resolverImpl,
new Object[]
{ publicId, systemId });
}
catch (Exception ex) {
throw new BuildException(ex);
}
}
return result;
}
public Source resolve(String href, String base)
throws TransformerException {
SAXSource result = null;
InputSource source = null;
processExternalCatalogs();
ResourceLocation matchingEntry = findMatchingEntry(href);
if (matchingEntry != null) {
log("Matching catalog entry found for uri: '" +
matchingEntry.getPublicId() + "' location: '" +
matchingEntry.getLocation() + "'",
Project.MSG_DEBUG);
source = filesystemLookup(matchingEntry);
if (source == null) {
source = classpathLookup(matchingEntry);
}
if (source != null) {
result = new SAXSource(source);
} else {
try {
result =
(SAXSource)resolve.invoke(resolverImpl,
new Object[]
{ href, base });
}
catch (Exception ex) {
throw new BuildException(ex);
}
}
}
else {
//
// We didn't match a ResourceLocation, but since we
// only support PUBLIC and URI entry types, it is
// still possible that there is another entry in an
// external catalog that will match. We call Apache
// resolver's resolveEntity method to cover this
// possibility.
//
try {
result =
(SAXSource)resolve.invoke(resolverImpl,
new Object[]
{ href, base });
}
catch (Exception ex) {
throw new BuildException(ex);
}
}
return result;
}
/**
* Process each external catalog file specified in a
* <code><catalogfiles></code> FileSet. It will be
* parsed by the resolver library, and the individual elements
* will be added back to us (that is, the controlling
* XMLCatalog instance) via a callback mechanism.
*/
private void processExternalCatalogs() {
if (externalCatalogsProcessed == false) {
try {
setXMLCatalog.invoke(resolverImpl,
new Object[]
{ XMLCatalog.this });
}
catch (Exception ex) {
throw new BuildException(ex);
}
Enumeration enum = getElements().elements();
while (enum.hasMoreElements()) {
Object o = enum.nextElement();
if (o instanceof FileSet) {
FileSet fs = (FileSet)o;
DirectoryScanner ds =
fs.getDirectoryScanner(getProject());
String[] files = ds.getIncludedFiles();
for (int i = 0; i < files.length; i++) {
File catFile = new File(ds.getBasedir(), files[i]);
try {
parseCatalog.invoke(resolverImpl,
new Object[]
{ catFile.getPath() });
}
catch (Exception ex) {
throw new BuildException(ex);
}
}
}
}
}
externalCatalogsProcessed = true;
}
}
}
Stefan Bodewig