| /* |
| * 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 org.apache.log4j.rule; |
| |
| import org.apache.log4j.spi.LoggingEventFieldResolver; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Stack; |
| import org.apache.log4j.chainsaw.logevents.ChainsawLoggingEvent; |
| |
| |
| /** |
| * A Rule class implementing inequality evaluation. |
| * expects to be able to convert two values to longs. |
| * If a specific inequality evaluation class has been provided |
| * for the event field, the appropriate rule is returned. |
| * (For example, if the expression is Level < DEBUG, |
| * a LevelInequalityRule is returned). |
| * |
| * @author Scott Deboy (sdeboy@apache.org) |
| */ |
| public class InequalityRule extends AbstractRule { |
| /** |
| * Serialization ID. |
| */ |
| static final long serialVersionUID = -5592986598528885122L; |
| /** |
| * field RESOLVER. |
| */ |
| private static final LoggingEventFieldResolver RESOLVER = |
| LoggingEventFieldResolver.getInstance(); |
| /** |
| * Field name. |
| */ |
| private final String field; |
| /** |
| * Comparison value. |
| */ |
| private final String value; |
| /** |
| * Inequality symbol. |
| */ |
| private final String inequalitySymbol; |
| |
| /** |
| * Create new instance. |
| * @param inequalitySymbol inequality symbol. |
| * @param field field |
| * @param value comparison value. |
| */ |
| private InequalityRule( |
| final String inequalitySymbol, |
| final String field, |
| final String value) { |
| super(); |
| this.inequalitySymbol = inequalitySymbol; |
| if (!RESOLVER.isField(field)) { |
| throw new IllegalArgumentException("Invalid " + inequalitySymbol |
| + " rule - " + field + " is not a supported field"); |
| } |
| |
| this.field = field; |
| this.value = value; |
| } |
| |
| /** |
| * Create new instance from top two elements on stack. |
| * @param inequalitySymbol inequality symbol. |
| * @param stack stack. |
| * @return rule. |
| */ |
| public static Rule getRule(final String inequalitySymbol, |
| final Stack stack) { |
| if (stack.size() < 2) { |
| throw new IllegalArgumentException("Invalid " + inequalitySymbol |
| + " rule - expected two parameters but received " |
| + stack.size()); |
| } |
| |
| String p2 = stack.pop().toString(); |
| String p1 = stack.pop().toString(); |
| return getRule(inequalitySymbol, p1, p2); |
| } |
| |
| /** |
| * Create new instance from top two elements on stack. |
| * @param inequalitySymbol inequality symbol. |
| * @param field field. |
| * @param value comparison value. |
| * @return rule. |
| */ |
| public static Rule getRule(final String inequalitySymbol, |
| final String field, |
| final String value) { |
| if (field.equalsIgnoreCase(LoggingEventFieldResolver.LEVEL_FIELD)) { |
| //push the value back on the stack and |
| // allow the level-specific rule pop values |
| return LevelInequalityRule.getRule(inequalitySymbol, value); |
| } else if ( |
| field.equalsIgnoreCase(LoggingEventFieldResolver.TIMESTAMP_FIELD)) { |
| return TimestampInequalityRule.getRule(inequalitySymbol, value); |
| } else { |
| return new InequalityRule(inequalitySymbol, field, value); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean evaluate(final ChainsawLoggingEvent event, Map matches) { |
| long first = 0; |
| try { |
| first = new Long(RESOLVER.getValue(field, event).toString()).longValue(); |
| } catch (NumberFormatException nfe) { |
| return false; |
| } |
| |
| long second = 0; |
| |
| try { |
| second = new Long(value).longValue(); |
| } catch (NumberFormatException nfe) { |
| return false; |
| } |
| |
| boolean result = false; |
| |
| if ("<".equals(inequalitySymbol)) { |
| result = first < second; |
| } else if (">".equals(inequalitySymbol)) { |
| result = first > second; |
| } else if ("<=".equals(inequalitySymbol)) { |
| result = first <= second; |
| } else if (">=".equals(inequalitySymbol)) { |
| result = first >= second; |
| } |
| if (result && matches != null) { |
| Set entries = (Set) matches.get(field.toUpperCase()); |
| if (entries == null) { |
| entries = new HashSet(); |
| matches.put(field.toUpperCase(), entries); |
| } |
| entries.add(String.valueOf(first)); |
| } |
| return result; |
| } |
| } |