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.util.Map;
020    
021    import org.apache.camel.CamelContext;
022    import org.apache.camel.Expression;
023    import org.apache.camel.component.file.GenericFileExclusiveReadLockStrategy;
024    import org.apache.camel.component.file.GenericFileProcessStrategy;
025    import org.apache.camel.util.ObjectHelper;
026    
027    public final class GenericFileProcessStrategyFactory {
028    
029        private GenericFileProcessStrategyFactory() {
030        }
031    
032        @SuppressWarnings("unchecked")
033        public static GenericFileProcessStrategy createGenericFileProcessStrategy(CamelContext context, Map<String, Object> params) {
034    
035            // We assume a value is present only if its value not null for String and 'true' for boolean
036            boolean isNoop = params.get("noop") != null;
037            boolean isDelete = params.get("delete") != null;
038            Expression moveExpression = (Expression) params.get("move");
039            Expression preMoveExpression = (Expression) params.get("preMove");
040    
041            if (isNoop) {
042                GenericFileNoOpProcessStrategy strategy = new GenericFileNoOpProcessStrategy();
043                strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
044                return strategy;
045            } else if (isDelete) {
046                GenericFileDeleteProcessStrategy strategy = new GenericFileDeleteProcessStrategy();
047                strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
048                return strategy;
049            } else if (moveExpression != null || preMoveExpression != null) {
050                FileRenameProcessStrategy strategy = new FileRenameProcessStrategy();
051                strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
052                if (moveExpression != null) {
053                    GenericFileExpressionRenamer renamer = new GenericFileExpressionRenamer();
054                    renamer.setExpression(moveExpression);
055                    strategy.setCommitRenamer(renamer);
056                }
057                if (preMoveExpression != null) {
058                    GenericFileExpressionRenamer renamer = new GenericFileExpressionRenamer();
059                    renamer.setExpression(preMoveExpression);
060                    strategy.setBeginRenamer(renamer);
061                }
062                return strategy;
063            } else {
064                // default strategy will do nothing
065                GenericFileNoOpProcessStrategy strategy = new GenericFileNoOpProcessStrategy();
066                strategy.setExclusiveReadLockStrategy(getExclusiveReadLockStrategy(params));
067                return strategy;
068            }
069        }
070    
071        private static GenericFileExclusiveReadLockStrategy getExclusiveReadLockStrategy(Map<String, Object> params) {
072            GenericFileExclusiveReadLockStrategy strategy = (GenericFileExclusiveReadLockStrategy) params.get("exclusiveReadLockStrategy");
073            if (strategy != null) {
074                return strategy;
075            }
076    
077            // no explicit stategy set then fallback to readLock option
078            String readLock = (String) params.get("readLock");
079            if (ObjectHelper.isNotEmpty(readLock)) {
080                if ("none".equals(readLock) || "false".equals(readLock)) {
081                    return null;
082                } else if ("rename".equals(readLock)) {
083                    GenericFileRenameExclusiveReadLockStrategy readLockStrategy = new GenericFileRenameExclusiveReadLockStrategy();
084                    Long timeout = (Long) params.get("readLockTimeout");
085                    if (timeout != null) {
086                        readLockStrategy.setTimeout(timeout);
087                    }
088                    return readLockStrategy;
089                }
090            }
091    
092            return null;
093        }
094    }