001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.appender.rolling.action;
018
019import java.nio.file.Path;
020import java.nio.file.attribute.BasicFileAttributes;
021import java.util.Arrays;
022import java.util.Collections;
023import java.util.List;
024
025import org.apache.logging.log4j.Logger;
026import org.apache.logging.log4j.core.config.plugins.Plugin;
027import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
028import org.apache.logging.log4j.core.config.plugins.PluginElement;
029import org.apache.logging.log4j.core.config.plugins.PluginFactory;
030import org.apache.logging.log4j.status.StatusLogger;
031
032/**
033 * PathCondition that accepts paths after some count threshold is exceeded during the file tree walk.
034 */
035@Plugin(name = "IfAccumulatedFileCount", category = "Core", printObject = true)
036public final class IfAccumulatedFileCount implements PathCondition {
037    private static final Logger LOGGER = StatusLogger.getLogger();
038    private final int threshold;
039    private int count;
040    private final PathCondition[] nestedConditions;
041
042    private IfAccumulatedFileCount(final int thresholdParam, final PathCondition[] nestedConditions) {
043        if (thresholdParam <= 0) {
044            throw new IllegalArgumentException("Count must be a positive integer but was " + thresholdParam);
045        }
046        this.threshold = thresholdParam;
047        this.nestedConditions = nestedConditions == null ? new PathCondition[0] : Arrays.copyOf(nestedConditions,
048                nestedConditions.length);
049    }
050
051    public int getThresholdCount() {
052        return threshold;
053    }
054
055    public List<PathCondition> getNestedConditions() {
056        return Collections.unmodifiableList(Arrays.asList(nestedConditions));
057    }
058
059    /*
060     * (non-Javadoc)
061     * 
062     * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#accept(java.nio.file.Path,
063     * java.nio.file.Path, java.nio.file.attribute.BasicFileAttributes)
064     */
065    @Override
066    public boolean accept(final Path basePath, final Path relativePath, final BasicFileAttributes attrs) {
067        final boolean result = ++count > threshold;
068        final String match = result ? ">" : "<=";
069        final String accept = result ? "ACCEPTED" : "REJECTED";
070        LOGGER.trace("IfAccumulatedFileCount {}: {} count '{}' {} threshold '{}'", accept, relativePath, count, match,
071                threshold);
072        if (result) {
073            return IfAll.accept(nestedConditions, basePath, relativePath, attrs);
074        }
075        return result;
076    }
077
078    /*
079     * (non-Javadoc)
080     * 
081     * @see org.apache.logging.log4j.core.appender.rolling.action.PathCondition#beforeFileTreeWalk()
082     */
083    @Override
084    public void beforeFileTreeWalk() {
085        count = 0;
086        IfAll.beforeFileTreeWalk(nestedConditions);
087    }
088
089    /**
090     * Create an IfAccumulatedFileCount condition.
091     * 
092     * @param threshold The threshold count from which files will be deleted.
093     * @return An IfAccumulatedFileCount condition.
094     */
095    @PluginFactory
096    public static IfAccumulatedFileCount createFileCountCondition( //
097            // @formatter:off
098            @PluginAttribute(value = "exceeds", defaultInt = Integer.MAX_VALUE) final int threshold,
099            @PluginElement("PathConditions") final PathCondition... nestedConditions) {
100            // @formatter:on
101
102        if (threshold == Integer.MAX_VALUE) {
103            LOGGER.error("IfAccumulatedFileCount invalid or missing threshold value.");
104        }
105        return new IfAccumulatedFileCount(threshold, nestedConditions);
106    }
107
108    @Override
109    public String toString() {
110        final String nested = nestedConditions.length == 0 ? "" : " AND " + Arrays.toString(nestedConditions);
111        return "IfAccumulatedFileCount(exceeds=" + threshold + nested + ")";
112    }
113}