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// Copyright 2014 Google Inc. All rights reserved.
//
// 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 com.google.devtools.build.lib.events;
import java.util.regex.Pattern;
/**
* An output filter for warnings.
*/
public interface OutputFilter {
/** An output filter that matches everything. */
public static final OutputFilter OUTPUT_EVERYTHING = new OutputFilter() {
@Override
public boolean showOutput(String tag) {
return true;
}
};
/** An output filter that matches nothing. */
public static final OutputFilter OUTPUT_NOTHING = new OutputFilter() {
@Override
public boolean showOutput(String tag) {
return false;
}
};
/**
* Returns true iff the given tag matches the output filter.
*/
boolean showOutput(String tag);
/**
* An output filter using regular expression matching.
*/
public static final class RegexOutputFilter implements OutputFilter {
/** Returns an output filter for the given regex (by compiling it). */
public static OutputFilter forRegex(String regex) {
return new RegexOutputFilter(Pattern.compile(regex));
}
/** Returns an output filter for the given pattern. */
public static OutputFilter forPattern(Pattern pattern) {
return new RegexOutputFilter(pattern);
}
private final Pattern pattern;
private RegexOutputFilter(Pattern pattern) {
this.pattern = pattern;
}
@Override
public boolean showOutput(String tag) {
return pattern.matcher(tag).find();
}
@Override
public String toString() {
return pattern.toString();
}
}
}
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