packageorg.apache.flume.interceptor;
importstaticorg.apache.flume.interceptor.RegexFilteringInterceptor.Constants.DEFAULT_EXCLUDE_EVENTS;
importstatic org.apache.flume.interceptor.RegexFilteringInterceptor.Constants.DEFAULT_REGEX;
importstatic org.apache.flume.interceptor.RegexFilteringInterceptor.Constants.EXCLUDE_EVENTS;
importstatic org.apache.flume.interceptor.RegexFilteringInterceptor.Constants.REGEX;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.slf4j.Logger;
importorg.slf4j.LoggerFactory;
import com.google.common.collect.Lists;
publicclass RegexFilteringInterceptorimplements Interceptor {
privatestaticfinal Loggerlogger =LoggerFactory
.getLogger(RegexFilteringInterceptor.class);
privatefinal Patternregex;
privatefinalbooleanexcludeEvents;
/**
*Only{@link RegexFilteringInterceptor.Builder}canbuildme
*/
private RegexFilteringInterceptor(Pattern regex,boolean excludeEvents) {
this.regex = regex;
this.excludeEvents = excludeEvents;
}
@Override
publicvoid initialize() {
// no-op
}
@Override
/**
*Returnstheeventifitpassestheregularexpressionfilterandnull
*otherwise.
*/
public Event intercept(Event event) {
// We've already ensured here that at most one of includeRegex and
// excludeRegex are defined.
if (!excludeEvents) {
if (regex.matcher(new String(event.getBody())).find()) {
return event;
}
else {
returnnull;
}
}
else {
if (regex.matcher(new String(event.getBody())).find()) {
returnnull;
}
else {
return event;
}
}
}
/**
*Returnsthesetofeventswhichpassfilters,accordingto
*{@link #intercept(Event)}.
*@paramevents
*@return
*/
@Override
public List<Event> intercept(List<Event> events) {
List<Event> out = Lists.newArrayList();
for (Event event : events) {
Event outEvent = intercept(event);
if (outEvent !=null) { out.add(outEvent); }
}
return out;
}
@Override
publicvoid close() {
// no-op
}
/**
*BuilderwhichbuildsnewinstanceoftheStaticInterceptor.
*/
publicstaticclass Builderimplements Interceptor.Builder {
private Patternregex;
privatebooleanexcludeEvents;
@Override
publicvoid configure(Context context) {
String regexString = context.getString(REGEX,DEFAULT_REGEX);
regex = Pattern.compile(regexString);
excludeEvents = context.getBoolean(EXCLUDE_EVENTS,
DEFAULT_EXCLUDE_EVENTS);
}
@Override
public Interceptor build() {
logger.info(String.format(
"Creating RegexFilteringInterceptor: regex=%s,excludeEvents=%s",
regex,excludeEvents));
returnnew RegexFilteringInterceptor(regex,excludeEvents);
}
}
publicstaticclass Constants {
publicstaticfinal StringREGEX ="regex";
publicstaticfinal StringDEFAULT_REGEX =".*";
publicstaticfinal StringEXCLUDE_EVENTS ="excludeEvents";
publicstaticfinalbooleanDEFAULT_EXCLUDE_EVENTS = false;
}
}
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