io.macgyver.plugin.metrics.RegexMetricFilter.java Source code

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Here is the source code for io.macgyver.plugin.metrics.RegexMetricFilter.java

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/**
 * 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 io.macgyver.plugin.metrics;

import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricFilter;
import com.google.common.base.CharMatcher;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.Lists;
import com.google.common.base.Strings;

public class RegexMetricFilter implements MetricFilter {

    List<Pattern> excludePatterns = Lists.newCopyOnWriteArrayList();
    List<Pattern> includePatterns = Lists.newCopyOnWriteArrayList();

    public RegexMetricFilter() {

    }

    public RegexMetricFilter excludes(String s) {

        Splitter.on(CharMatcher.anyOf(" \n\t\r,;|")).omitEmptyStrings().splitToList(Strings.nullToEmpty(s))
                .forEach(it -> {

                    exclude(Pattern.compile(it));

                });
        return this;
    }

    public RegexMetricFilter includes(String s) {

        Splitter.on(CharMatcher.anyOf(" \n\t\r,;|")).omitEmptyStrings().splitToList(Strings.nullToEmpty(s))
                .forEach(it -> {

                    include(Pattern.compile(it));

                });
        return this;
    }

    public RegexMetricFilter exclude(String s) {
        exclude(Pattern.compile(s));
        return this;
    }

    public RegexMetricFilter exclude(Pattern p) {

        Preconditions.checkNotNull(p);
        excludePatterns.add(p);
        return this;
    }

    public RegexMetricFilter include(String s) {
        include(Pattern.compile(s));
        return this;
    }

    public RegexMetricFilter include(Pattern p) {
        Preconditions.checkNotNull(p);
        includePatterns.add(p);
        return this;
    }

    @Override
    public boolean matches(String n, Metric metric) {

        boolean include = true;

        Iterator<Pattern> t = excludePatterns.iterator();

        while (include && t.hasNext()) {
            Pattern p = t.next();
            Matcher m = p.matcher(n);
            if (m.matches()) {
                include = false;
            }
        }
        if (include) {
            return true;
        }

        t = includePatterns.iterator();

        while (t.hasNext()) {
            Pattern p = t.next();
            Matcher m = p.matcher(n);
            if (m.matches()) {
                return true;
            }
        }

        return include;
    }

}