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+++ b/library/log4php/filters/LoggerFilterLevelRange.php
@@ -0,0 +1,138 @@
+<?php
+/**
+ * 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 log4php
+ */
+
+/**
+ * This is a very simple filter based on level matching, which can be
+ * used to reject messages with priorities outside a certain range.
+ *
+ * <p>The filter admits three options <b><var>LevelMin</var></b>, <b><var>LevelMax</var></b>
+ * and <b><var>AcceptOnMatch</var></b>.</p>
+ *
+ * <p>If the level of the {@link LoggerLoggingEvent} is not between Min and Max
+ * (inclusive), then {@link LoggerFilter::DENY} is returned.</p>
+ *
+ * <p>If the Logging event level is within the specified range, then if
+ * <b><var>AcceptOnMatch</var></b> is <i>true</i>,
+ * {@link LoggerFilter::ACCEPT} is returned, and if
+ * <b><var>AcceptOnMatch</var></b> is <i>false</i>,
+ * {@link LoggerFilter::NEUTRAL} is returned.</p>
+ *
+ * <p>If <b><var>LevelMin</var></b> is not defined, then there is no
+ * minimum acceptable level (i.e. a level is never rejected for
+ * being too "low"/unimportant).  If <b><var>LevelMax</var></b> is not
+ * defined, then there is no maximum acceptable level (ie a
+ * level is never rejected for being too "high"/important).</p>
+ *
+ * <p>Refer to the {@link LoggerAppender::setThreshold()} method
+ * available to <b>all</b> appenders extending {@link LoggerAppender}
+ * for a more convenient way to filter out events by level.</p>
+ *
+ * <p>
+ * An example for this filter:
+ *
+ * {@example ../../examples/php/filter_levelrange.php 19}
+ *
+ * <p>
+ * The corresponding XML file:
+ *
+ * {@example ../../examples/resources/filter_levelrange.xml 18}
+ *
+ * @author Simon Kitching
+ * @author based on the org.apache.log4j.varia.LevelRangeFilte Java code by Ceki G&uuml;lc&uuml;
+ *
+ * @version $Revision: 1213283 $
+ * @package log4php
+ * @subpackage filters
+ * @since 0.6
+ */
+class LoggerFilterLevelRange extends LoggerFilter {
+
+    /**
+     * @var boolean
+     */
+    protected $acceptOnMatch = true;
+
+    /**
+     * @var LoggerLevel
+     */
+    protected $levelMin;
+
+    /**
+     * @var LoggerLevel
+     */
+    protected $levelMax;
+
+    /**
+     * @param boolean $acceptOnMatch
+     */
+    public function setAcceptOnMatch($acceptOnMatch) {
+        $this->setBoolean('acceptOnMatch', $acceptOnMatch);
+    }
+
+    /**
+     * @param string $l the level min to match
+     */
+    public function setLevelMin($level) {
+        $this->setLevel('levelMin', $level);
+    }
+
+    /**
+     * @param string $l the level max to match
+     */
+    public function setLevelMax($level) {
+        $this->setLevel('levelMax', $level);
+    }
+
+    /**
+     * Return the decision of this filter.
+     *
+     * @param LoggerLoggingEvent $event
+     * @return integer
+     */
+    public function decide(LoggerLoggingEvent $event) {
+        $level = $event->getLevel();
+
+        if ($this->levelMin !== null) {
+            if ($level->isGreaterOrEqual($this->levelMin) == false) {
+                // level of event is less than minimum
+                return LoggerFilter::DENY;
+            }
+        }
+
+        if ($this->levelMax !== null) {
+            if ($level->toInt() > $this->levelMax->toInt()) {
+                // level of event is greater than maximum
+                // Alas, there is no Level.isGreater method. and using
+                // a combo of isGreaterOrEqual && !Equal seems worse than
+                // checking the int values of the level objects..
+                return LoggerFilter::DENY;
+            }
+        }
+
+        if ($this->acceptOnMatch) {
+            // this filter set up to bypass later filters and always return
+            // accept if level in range
+            return LoggerFilter::ACCEPT;
+        } else {
+            // event is ok for this filter; allow later filters to have a look..
+            return LoggerFilter::NEUTRAL;
+        }
+    }
+}