| /* |
| * 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 java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.Stack; |
| import org.apache.log4j.chainsaw.logevents.ChainsawLoggingEvent; |
| import org.apache.log4j.spi.LoggingEventFieldResolver; |
| |
| /** |
| * A Rule class which returns the result of |
| * performing equals against two strings. |
| * |
| * @author Scott Deboy (sdeboy@apache.org) |
| */ |
| public class EqualsRule extends AbstractRule { |
| /** |
| * Serialization ID. |
| */ |
| static final long serialVersionUID = 1712851553477517245L; |
| /** |
| * Resolver. |
| */ |
| private static final LoggingEventFieldResolver RESOLVER = LoggingEventFieldResolver.getInstance(); |
| /** |
| * Value. |
| */ |
| private final String value; |
| /** |
| * Field. |
| */ |
| private final String field; |
| |
| /** |
| * Create new instance. |
| * @param field field |
| * @param value value |
| */ |
| private EqualsRule(final String field, final String value) { |
| super(); |
| if (!RESOLVER.isField(field)) { |
| throw new IllegalArgumentException("Invalid EQUALS rule - " + field + " is not a supported field"); |
| } |
| |
| this.field = field; |
| this.value = value; |
| } |
| |
| /** |
| * Create new instance from top two elements of stack. |
| * @param stack stack |
| * @return new instance |
| */ |
| public static Rule getRule(final Stack stack) { |
| if (stack.size() < 2) { |
| throw new IllegalArgumentException( |
| "Invalid EQUALS rule - expected two parameters but received " + stack.size()); |
| } |
| |
| String p2 = stack.pop().toString(); |
| String p1 = stack.pop().toString(); |
| |
| return getRule(p1, p2); |
| } |
| |
| /** |
| * Create new instance. |
| * @param p1 field, special treatment for level and timestamp. |
| * @param p2 value |
| * @return new instance |
| */ |
| public static Rule getRule(final String p1, final String p2) { |
| if (p1.equalsIgnoreCase(LoggingEventFieldResolver.LEVEL_FIELD)) { |
| return LevelEqualsRule.getRule(p2); |
| } else if (p1.equalsIgnoreCase(LoggingEventFieldResolver.TIMESTAMP_FIELD)) { |
| return TimestampEqualsRule.getRule(p2); |
| } else { |
| return new EqualsRule(p1, p2); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean evaluate(final ChainsawLoggingEvent event, Map matches) { |
| Object p2 = RESOLVER.getValue(field, event); |
| |
| boolean result = (p2 != null) && p2.toString().equals(value); |
| if (result && matches != null) { |
| Set entries = (Set) matches.get(field.toUpperCase()); |
| if (entries == null) { |
| entries = new HashSet(); |
| matches.put(field.toUpperCase(), entries); |
| } |
| entries.add(value); |
| } |
| return result; |
| } |
| } |