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 */
017 package org.apache.camel.component.file.strategy;
018
019 import java.io.File;
020 import java.util.Map;
021
022 import org.apache.camel.CamelContext;
023 import org.apache.camel.Expression;
024 import org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy;
025 import org.apache.camel.component.file.GenericFileProcessStrategy;
026 import org.apache.camel.spi.Language;
027 import org.apache.camel.util.ObjectHelper;
028
029 public final class FileProcessStrategyFactory {
030
031 private FileProcessStrategyFactory() {
032 }
033
034 public static GenericFileProcessStrategy<File> createGenericFileProcessStrategy(CamelContext context, Map<String, Object> params) {
035
036 // We assume a value is present only if its value not null for String and 'true' for boolean
037 Expression moveExpression = (Expression) params.get("move");
038 Expression moveFailedExpression = (Expression) params.get("moveFailed");
039 Expression preMoveExpression = (Expression) params.get("preMove");
040 boolean isNoop = params.get("noop") != null;
041 boolean isDelete = params.get("delete") != null;
042 boolean isMove = moveExpression != null || preMoveExpression != null || moveFailedExpression != null;
043
044 if (isNoop) {
045 GenericFileNoOpProcessStrategy<File> strategy = new GenericFileNoOpProcessStrategy<File>();
046 strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
047 return strategy;
048 } else if (isDelete) {
049 GenericFileDeleteProcessStrategy<File> strategy = new GenericFileDeleteProcessStrategy<File>();
050 strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
051 return strategy;
052 } else if (isMove) {
053 GenericFileRenameProcessStrategy<File> strategy = new GenericFileRenameProcessStrategy<File>();
054 strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
055 if (moveExpression != null) {
056 GenericFileExpressionRenamer<File> renamer = new GenericFileExpressionRenamer<File>();
057 renamer.setExpression(moveExpression);
058 strategy.setCommitRenamer(renamer);
059 } else {
060 strategy.setCommitRenamer(getDefaultCommitRenamer(context));
061 }
062 if (preMoveExpression != null) {
063 GenericFileExpressionRenamer<File> renamer = new GenericFileExpressionRenamer<File>();
064 renamer.setExpression(preMoveExpression);
065 strategy.setBeginRenamer(renamer);
066 }
067 if (moveFailedExpression != null) {
068 GenericFileExpressionRenamer<File> renamer = new GenericFileExpressionRenamer<File>();
069 renamer.setExpression(moveFailedExpression);
070 strategy.setFailureRenamer(renamer);
071 }
072 return strategy;
073 } else {
074 // default strategy will move files in a .camel/ subfolder where the file was consumed
075 GenericFileRenameProcessStrategy<File> strategy = new GenericFileRenameProcessStrategy<File>();
076 strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
077 strategy.setCommitRenamer(getDefaultCommitRenamer(context));
078 return strategy;
079 }
080 }
081
082 private static GenericFileExpressionRenamer<File> getDefaultCommitRenamer(CamelContext context) {
083 // use context to lookup language to let it be loose coupled
084 Language language = context.resolveLanguage("file");
085 Expression expression = language.createExpression("${file:parent}/.camel/${file:onlyname}");
086 return new GenericFileExpressionRenamer<File>(expression);
087 }
088
089 @SuppressWarnings("unchecked")
090 private static GenericFileExclusiveReadLockStrategy<File> getExclusiveReadLockStrategy(Map<String, Object> params) {
091 GenericFileExclusiveReadLockStrategy strategy = (GenericFileExclusiveReadLockStrategy) params.get("exclusiveReadLockStrategy");
092 if (strategy != null) {
093 return strategy;
094 }
095
096 // no explicit stategy set then fallback to readLock option
097 String readLock = (String) params.get("readLock");
098 if (ObjectHelper.isNotEmpty(readLock)) {
099 if ("none".equals(readLock) || "false".equals(readLock)) {
100 return null;
101 } else if ("fileLock".equals(readLock)) {
102 GenericFileExclusiveReadLockStrategy<File> readLockStrategy = new FileLockExclusiveReadLockStrategy();
103 Long timeout = (Long) params.get("readLockTimeout");
104 if (timeout != null) {
105 readLockStrategy.setTimeout(timeout);
106 }
107 return readLockStrategy;
108 } else if ("rename".equals(readLock)) {
109 GenericFileExclusiveReadLockStrategy<File> readLockStrategy = new GenericFileRenameExclusiveReadLockStrategy<File>();
110 Long timeout = (Long) params.get("readLockTimeout");
111 if (timeout != null) {
112 readLockStrategy.setTimeout(timeout);
113 }
114 return readLockStrategy;
115 } else if ("changed".equals(readLock)) {
116 GenericFileExclusiveReadLockStrategy readLockStrategy = new FileChangedExclusiveReadLockStrategy();
117 Long timeout = (Long) params.get("readLockTimeout");
118 if (timeout != null) {
119 readLockStrategy.setTimeout(timeout);
120 }
121 return readLockStrategy;
122 } else if ("markerFile".equals(readLock)) {
123 return new MarkerFileExclusiveReadLockStrategy();
124 }
125 }
126
127 return null;
128 }
129 }