/*
* 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.apache.hadoop.chukwa.util;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import org.apache.commons.lang.ArrayUtils;
import org.apache.hadoop.chukwa.Chunk;
import org.apache.hadoop.chukwa.extraction.engine.RecordUtil;
public class Filter {
private static final String[] SEARCH_TARGS =
{"datatype", "name", "host", "cluster", "content"};
static final String SEPARATOR="&";
private static class SearchRule {
Pattern p;
String targ;
SearchRule(Pattern p, String t) {
this.p = p;
this.targ = t;
}
boolean matches(Chunk chunk) {
if(targ.equals("datatype")) {
return p.matcher(chunk.getDataType()).matches();
} else if(targ.equals("name")) {
return p.matcher(chunk.getStreamName()).matches();
} else if(targ.equals("host")) {
return p.matcher(chunk.getSource()).matches();
} else if(targ.equals("cluster")) {
String cluster = RecordUtil.getClusterName(chunk);
return p.matcher(cluster).matches();
} else if(targ.equals("content")) {
String content = new String(chunk.getData());
return p.matcher(content).matches();
} else if(targ.startsWith("tags.")) {
String tagName = targ.substring("tags.".length());
String tagVal = chunk.getTag(tagName);
if(tagVal == null)
return false;
return p.matcher(tagVal).matches();
} else {
assert false: "unknown target: " +targ;
return false;
}
}
public String toString() {
return targ + "=" +p.toString();
}
}
List<SearchRule> compiledPatterns;
public Filter(String listOfPatterns) throws PatternSyntaxException{
compiledPatterns = new ArrayList<SearchRule>();
//FIXME: could escape these
String[] patterns = listOfPatterns.split(SEPARATOR);
for(String p: patterns) {
int equalsPos = p.indexOf('=');
if(equalsPos < 0 || equalsPos > (p.length() -2)) {
throw new PatternSyntaxException(
"pattern must be of form targ=pattern", p, -1);
}
String targ = p.substring(0, equalsPos);
if(!targ.startsWith("tags.") && !ArrayUtils.contains(SEARCH_TARGS, targ)) {
throw new PatternSyntaxException(
"pattern doesn't start with recognized search target", p, -1);
}
Pattern pat = Pattern.compile(p.substring(equalsPos+1), Pattern.DOTALL);
compiledPatterns.add(new SearchRule(pat, targ));
}
}
public boolean matches(Chunk chunk) {
for(SearchRule r: compiledPatterns) {
if(!r.matches(chunk))
return false;
}
return true;
}
int size() {
return compiledPatterns.size();
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(compiledPatterns.get(0));
for(int i=1; i < compiledPatterns.size(); ++i) {
sb.append(" & ");
sb.append(compiledPatterns.get(i));
}
return sb.toString();
}
private static final class MatchAll extends Filter {
public MatchAll() {
super("datatype=.*");
}
public boolean matches(Chunk c) {
return true;
}
public String toString() {
return "ALL";
}
}
public static final Filter ALL = new MatchAll();
}//end class