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Use wicketstuff-annotation to use Java Annotations and class path searching to mount your Wicket pages.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wicketstuff.config;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.classreading.SimpleMetadataReaderFactory;
/**
* Class to get matching resources - uses Spring's {@link PathMatchingResourcePatternResolver}.
*
* @see PathMatchingResourcePatternResolver
*
* @author Doug Donohoe
*/
public class MatchingResources
{
private static Logger logger = LoggerFactory.getLogger(MatchingResources.class);
private Resource[] resources;
private String pattern;
/**
* Initialize list of matching {@link Resource} as found by
* {@link PathMatchingResourcePatternResolver#getResources(String)}.
*
* @param sPattern
* the pattern to search for
* @see PathMatchingResourcePatternResolver
*/
public MatchingResources(String sPattern)
{
pattern = sPattern.replace('\\', '/'); // fix DOS paths
PathMatchingResourcePatternResolver match = new PathMatchingResourcePatternResolver();
try
{
resources = match.getResources(pattern);
logger.debug("Found " + resources.length + " resource(s) for: " + pattern);
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
/**
* Get all matching resources
*
* @return A {@link Resource} array of all matches. If no matches are found this is a
* zero-length array.
*/
public Resource[] getAllMatches()
{
return resources;
}
/**
* Get all matching resources as URLs.
*
* @return {@link URL} array detemined by calling {@link #getURL(Resource)} on each resource.
*/
public URL[] getAllMatchesURL()
{
URL urls[] = new URL[resources.length];
for (int i = 0; i < resources.length; i++)
{
urls[i] = getURL(resources[i]);
}
return urls;
}
/**
* Get all matching classes that are annotated with the given Annotation.
*
* @param annotation
* an annotation class
* @param includeSubclasses
* if true, this will also return classes whose superclass has the specified
* annotation
* @return List of all classes that have the given annotation. List is empty if non matches
* found.
*/
public List> getAnnotatedMatches(Class annotation,
boolean includeSubclasses)
{
List> matches = new ArrayList>();
MetadataReaderFactory f = new SimpleMetadataReaderFactory();
for (Resource r : resources)
{
MetadataReader meta = null;
try
{
meta = f.getMetadataReader(r);
}
catch (IOException e)
{
throw new RuntimeException("Unable to get MetadataReader for " + r, e);
}
AnnotationMetadata anno = meta.getAnnotationMetadata();
Set types = anno.getAnnotationTypes();
if (types.contains(annotation.getName()) ||
(includeSubclasses && anySuperHas(getClass(anno.getSuperClassName()), annotation)))
{
matches.add(getClass(anno.getClassName()));
}
}
return matches;
}
/**
* Get all matching classes that are annotated with the given Annotation. Note that this method
* only returns those classes that actually contain the annotation, and does not return classes
* whose superclass contains the annotation.
*
* @param annotation
* an annotation class
* @return List of all classes that have the given annotation. List is empty if non matches
* found.
* @see MatchingResources#getAnnotatedMatches(Class, boolean)
*/
public List> getAnnotatedMatches(Class annotation)
{
return getAnnotatedMatches(annotation, false);
}
private boolean anySuperHas(Class clz, Class annotation)
{
return clz != null &&
(clz.isAnnotationPresent(annotation) || anySuperHas(clz.getSuperclass(), annotation));
}
private Class getClass(String className)
{
try
{
return Class.forName(className);
}
catch (ClassNotFoundException e)
{
throw new RuntimeException(e);
}
}
/**
* Get a single matching resource. Throws an exception if multiple are found. This is useful if
* you are expecting to find only one instance of an item on the classpath.
*
* @return The single matching {@link Resource}
* @throws RuntimeException
* if more than one {@link Resource} was found
*/
public Resource getSingleResource()
{
if (resources.length > 1)
{
throw new RuntimeException("Found more than one resource in classpath for " + pattern +
": " + toString());
}
if (resources.length == 0)
return null;
return resources[0];
}
/**
* Similar to {@link #getSingleResource()}, but returns result as an {@link URL}.
*
* @return The single matching {@link Resource} as an {@link URL}
* @throws RuntimeException
* if more than one {@link Resource} was found
*/
public URL getSingleResourceURL()
{
Resource r = getSingleResource();
if (r == null)
return null;
return getURL(r);
}
/**
* Get a single required matching resource. Throws an exception if zero or multiple are found.
* This is useful if you are expecting to find one and only one instance of an item on the
* classpath.
*
* @return The single matching {@link Resource}
* @throws RuntimeException
* if zero or more than one {@link Resource} was found
*/
public Resource getSingleRequiredResource()
{
if (resources.length == 0)
{
throw new RuntimeException("Cound not find required resource for " + pattern);
}
if (resources.length > 1)
{
throw new RuntimeException("Found more than one resource in classpath for " + pattern +
": " + toString());
}
if (resources.length == 0)
return null;
return resources[0];
}
/**
* Similar to {@link #getSingleRequiredResource()}, but returns result as an {@link URL}.
*
* @return The single matching {@link Resource} as an {@link URL}
* @throws RuntimeException
* if zero or more than one {@link Resource} was found
*/
public URL getSingleRequiredResourceURL()
{
Resource r = getSingleRequiredResource();
if (r == null)
return null;
return getURL(r);
}
/**
* Get URL from resource.
*
* @param r
* a {@link Resource}
* @return its URL
* @throws RuntimeException
* if {@link Resource#getURL()} throws {@link IOException}
*/
public URL getURL(Resource r)
{
if (r == null)
return null;
try
{
return r.getURL();
}
catch (IOException e)
{
throw new RuntimeException(e);
}
}
/**
* @return string representing all matching resouces as URLs
*/
@Override
public String toString()
{
StringBuilder sb = new StringBuilder();
for (Resource r : resources)
{
if (sb.length() > 0)
sb.append('\n');
sb.append(getURL(r).toString());
}
return sb.toString();
}
}