net.sf.ehcache.pool.sizeof.filter.ResourceSizeOfFilter Maven / Gradle / Ivy
/**
* Copyright 2003-2010 Terracotta, Inc.
*
* Licensed 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 net.sf.ehcache.pool.sizeof.filter;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.net.URL;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
/**
* Filters based on a configuration file
*
* @author Chris Dennis
*/
public class ResourceSizeOfFilter implements SizeOfFilter {
private final Set filteredTerms;
/**
* Builds a filter based on the provided configuration URL
* @param filterData the URL of the configuration
* @throws IOException if it couldn't read the configuration from the URL
*/
public ResourceSizeOfFilter(URL filterData) throws IOException {
if (filterData == null) {
filteredTerms = Collections.emptySet();
} else {
InputStream is = filterData.openStream();
try {
Set filtered = new HashSet();
BufferedReader r = new BufferedReader(new InputStreamReader(is));
try {
while (true) {
String field = r.readLine();
if (field == null) {
break;
} else {
field = field.trim();
if (field.length() > 0 && !field.startsWith("#")) {
filtered.add(field);
}
}
}
filteredTerms = Collections.unmodifiableSet(filtered);
} finally {
r.close();
}
} finally {
is.close();
}
}
}
/**
* {@inheritDoc}
*/
public Collection filterFields(Class klazz, Collection fields) {
for (Iterator it = fields.iterator(); it.hasNext();) {
Field f = it.next();
if (filteredTerms.contains(f.getDeclaringClass().getName() + "." + f.getName())) {
it.remove();
}
}
return fields;
}
/**
* {@inheritDoc}
*/
public boolean filterClass(Class klazz) {
String klazzName = klazz.getName();
if (filteredTerms.contains(klazzName)) {
return false;
}
int lastDot = klazzName.lastIndexOf('.');
if (lastDot >= 0) {
String packageName = klazzName.substring(0, lastDot);
if (packageName.length() > 0 && filteredTerms.contains(packageName)) {
return false;
}
}
return true;
}
}