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Posted to cvs@avalon.apache.org by do...@apache.org on 2002/09/20 11:14:58 UTC
cvs commit: jakarta-avalon-excalibur/loader/src/java/org/apache/excalibur/loader/reader ClassLoaderSetReader.java ClassLoaderSetBuilder.java
donaldp 2002/09/20 02:14:58
Added: loader/src/java/org/apache/excalibur/loader/reader
ClassLoaderSetReader.java
Removed: loader/src/java/org/apache/excalibur/loader/reader
ClassLoaderSetBuilder.java
Log:
Rename from Builder to reader
Revision Changes Path
1.1 jakarta-avalon-excalibur/loader/src/java/org/apache/excalibur/loader/reader/ClassLoaderSetReader.java
Index: ClassLoaderSetReader.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.excalibur.loader.reader;
import java.util.ArrayList;
import org.apache.avalon.excalibur.extension.Extension;
import org.apache.excalibur.loader.metadata.ClassLoaderMetaData;
import org.apache.excalibur.loader.metadata.ClassLoaderSetMetaData;
import org.apache.excalibur.loader.metadata.FileSetMetaData;
import org.apache.excalibur.loader.metadata.JoinMetaData;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
/**
* This class builds a {@link ClassLoaderSetMetaData} object from
* specified configuration.
*
* @author <a href="mailto:peter at apache.org">Peter Donald</a>
* @version $Revision: 1.1 $ $Date: 2002/09/20 09:14:58 $
*/
public class ClassLoaderSetReader
{
/**
* Build ClassLoader MetaData from a DOM tree.
*
* @param config the root element
* @return the meta data
* @throws Exception if malformed DOM
*/
public ClassLoaderSetMetaData build( final Element config )
throws Exception
{
final String defaultClassLoader =
config.getAttribute( "default" );
if( isUnspecified( defaultClassLoader ) )
{
final String message = "Default classloader not specified.";
throw new Exception( message );
}
final String version =
config.getAttribute( "version" );
if( !"1.0".equals( version ) )
{
final String message = "Bad version:" + version;
throw new Exception( message );
}
final NodeList joinConfigs =
config.getElementsByTagName( "join" );
final JoinMetaData[] joins = buildJoins( joinConfigs );
final NodeList clConfigs =
config.getElementsByTagName( "classloader" );
final ClassLoaderMetaData[] classloaders =
buildClassLoaders( clConfigs );
final NodeList predefinedConfigs =
config.getElementsByTagName( "predefined" );
final String[] predefined =
buildPredefined( predefinedConfigs );
return new ClassLoaderSetMetaData( defaultClassLoader,
predefined,
classloaders,
joins );
}
/**
* Parse out a set of predefined classloaders from
* specified nodes.
*
* @param configs the nodes to process
* @return the predefined classloaders
*/
private String[] buildPredefined( final NodeList configs )
{
final ArrayList predefines = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element element = (Element)configs.item( i );
final String predefined = element.getAttribute( "name" );
predefines.add( predefined );
}
return (String[])predefines.toArray( new String[ predefines.size() ] );
}
/**
* Build an array of ClassLoader meta datas from node list.
*
* @param configs the nodes to process
* @return the classloaders
*/
private ClassLoaderMetaData[] buildClassLoaders( final NodeList configs )
throws Exception
{
final ArrayList loaders = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element item = (Element)configs.item( i );
final ClassLoaderMetaData loader = buildLoader( item );
loaders.add( loader );
}
return (ClassLoaderMetaData[])loaders.toArray( new ClassLoaderMetaData[ loaders.size() ] );
}
/**
* Build a ClassLoader meta datas from element.
*
* @param config the nodes to process
* @return the classloader
*/
private ClassLoaderMetaData buildLoader( final Element config )
throws Exception
{
final String name = config.getAttribute( "name" );
final String parent = config.getAttribute( "parent" );
final String[] entrys =
buildEntrys( config.getElementsByTagName( "entry" ) );
final Extension[] extensions =
buildExtensions( config.getElementsByTagName( "extension" ) );
final FileSetMetaData[] fileSets =
buildFileSets( config.getElementsByTagName( "fileset" ) );
return new ClassLoaderMetaData( name, parent, entrys,
extensions, fileSets );
}
/**
* Build and array of extensions
*
* @param configs the nodes to process
* @return an array of extensions
*/
private Extension[] buildExtensions( final NodeList configs )
throws Exception
{
final ArrayList extensions = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Extension extension =
buildExtension( (Element)configs.item( i ) );
extensions.add( extension );
}
return (Extension[])extensions.toArray( new Extension[ extensions.size() ] );
}
/**
* Build an extension from a DOM element.
*
* @param config the node to process
* @return an extension
*/
private Extension buildExtension( final Element config )
throws Exception
{
final String name = config.getAttribute( "name" );
if( isUnspecified( name ) )
{
final String message = "Missing name from extension";
throw new Exception( message );
}
final String specVersion =
config.getAttribute( "specification-version" );
final String specVendor =
config.getAttribute( "specification-vendor" );
final String implVersion =
config.getAttribute( "implementation-version" );
final String implVendor =
config.getAttribute( "implementation-vendor" );
final String implVendorID =
config.getAttribute( "implementation-vendor-id" );
final String implURL =
config.getAttribute( "implementation-url" );
return new Extension( name, specVersion, specVendor,
implVersion, implVendor, implVendorID,
implURL );
}
/**
* Build and array of file sets.
*
* @param configs the nodes to process
* @return an array of file sets
*/
private FileSetMetaData[] buildFileSets( final NodeList configs )
{
final ArrayList fileSets = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final FileSetMetaData fileSet =
buildFileSet( (Element)configs.item( i ) );
fileSets.add( fileSet );
}
return (FileSetMetaData[])fileSets.toArray( new FileSetMetaData[ fileSets.size() ] );
}
/**
* Build a fileset from a DOM element.
*
* @param config the node to process
* @return a fileset
*/
private FileSetMetaData buildFileSet( final Element config )
{
final String dir = config.getAttribute( "dir" );
final String[] includes =
buildSelectors( config.getElementsByTagName( "include" ) );
final String[] excludes =
buildSelectors( config.getElementsByTagName( "exclude" ) );
return new FileSetMetaData( dir, includes, excludes );
}
/**
* Build and array of selectors (ie includes/excludes).
*
* @param configs the nodes to process
* @return an array of selectors
*/
private String[] buildSelectors( final NodeList configs )
{
final ArrayList selectors = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element element = (Element)configs.item( i );
final String name = element.getAttribute( "name" );
selectors.add( name );
}
return (String[])selectors.toArray( new String[ selectors.size() ] );
}
/**
* Build file entrys from a nodelist.
*
* @param configs the nodes to procexx
* @return an array of file entrys
*/
private String[] buildEntrys( final NodeList configs )
{
final ArrayList entrys = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element config = (Element)configs.item( i );
final String entry = config.getAttribute( "location" );
entrys.add( entry );
}
return (String[])entrys.toArray( new String[ entrys.size() ] );
}
/**
* Build an array of Join classloaders out of supplied nodes.
*
* @param configs the nodes to process
* @return the join meta data array
*/
private JoinMetaData[] buildJoins( final NodeList configs )
{
final ArrayList joins = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element config = (Element)configs.item( i );
final JoinMetaData join = buildJoin( config );
joins.add( join );
}
return (JoinMetaData[])joins.toArray( new JoinMetaData[ joins.size() ] );
}
/**
* Build a Join classloader out of supplied Element.
*
* @param config the config element
* @return the join meta data
*/
private JoinMetaData buildJoin( final Element config )
{
final String name = config.getAttribute( "name" );
final NodeList children =
config.getElementsByTagName( "classloader-ref" );
final String[] classloaders =
buildClassLoaderRefs( children );
return new JoinMetaData( name, classloaders );
}
/**
* Create a set of strings for ClassLoader references
* in a Join classloader.
*
* @param configs the nodes to process
* @return the strings for class loader refs
*/
private String[] buildClassLoaderRefs( final NodeList configs )
{
final ArrayList refs = new ArrayList();
final int length = configs.getLength();
for( int i = 0; i < length; i++ )
{
final Element element = (Element)configs.item( i );
final String ref = element.getAttribute( "name" );
refs.add( ref );
}
return (String[])refs.toArray( new String[ refs.size() ] );
}
/**
* Utility class to test if attribute is unspecified (by
* testing if it is equal to empty string).
*
* @param attribute the attribute
* @return true if equal to empty string
*/
private boolean isUnspecified( final String attribute )
{
return "".equals( attribute );
}
}
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