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 <T> GenericFileProcessStrategy<T> 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            Expression moveExpression = (Expression) params.get("move");
037            Expression moveFailedExpression = (Expression) params.get("moveFailed");
038            Expression preMoveExpression = (Expression) params.get("preMove");
039            boolean isNoop = params.get("noop") != null;
040            boolean isDelete = params.get("delete") != null;
041            boolean isMove = moveExpression != null || preMoveExpression != null || moveFailedExpression != null;
042    
043            if (isNoop) {
044                GenericFileNoOpProcessStrategy<T> strategy = new GenericFileNoOpProcessStrategy<T>();
045                strategy.setExclusiveReadLockStrategy((GenericFileExclusiveReadLockStrategy<T>) getExclusiveReadLockStrategy(params));
046                return strategy;
047            } else if (isDelete) {
048                GenericFileDeleteProcessStrategy<T> strategy = new GenericFileDeleteProcessStrategy<T>();
049                strategy.setExclusiveReadLockStrategy((GenericFileExclusiveReadLockStrategy<T>) getExclusiveReadLockStrategy(params));
050                return strategy;
051            } else if (isMove) {
052                GenericFileRenameProcessStrategy<T> strategy = new GenericFileRenameProcessStrategy<T>();
053                strategy.setExclusiveReadLockStrategy((GenericFileExclusiveReadLockStrategy<T>) getExclusiveReadLockStrategy(params));
054                if (moveExpression != null) {
055                    GenericFileExpressionRenamer<T> renamer = new GenericFileExpressionRenamer<T>();
056                    renamer.setExpression(moveExpression);
057                    strategy.setCommitRenamer(renamer);
058                }
059                if (moveFailedExpression != null) {
060                    GenericFileExpressionRenamer<T> renamer = new GenericFileExpressionRenamer<T>();
061                    renamer.setExpression(moveFailedExpression);
062                    strategy.setFailureRenamer(renamer);
063                }
064                if (preMoveExpression != null) {
065                    GenericFileExpressionRenamer<T> renamer = new GenericFileExpressionRenamer<T>();
066                    renamer.setExpression(preMoveExpression);
067                    strategy.setBeginRenamer(renamer);
068                }
069                return strategy;
070            } else {
071                // default strategy will do nothing
072                GenericFileNoOpProcessStrategy<T> strategy = new GenericFileNoOpProcessStrategy<T>();
073                strategy.setExclusiveReadLockStrategy((GenericFileExclusiveReadLockStrategy<T>) getExclusiveReadLockStrategy(params));
074                return strategy;
075            }
076        }
077    
078        @SuppressWarnings("unchecked")
079        private static <T> GenericFileExclusiveReadLockStrategy<T> getExclusiveReadLockStrategy(Map<String, Object> params) {
080            GenericFileExclusiveReadLockStrategy<T> strategy = (GenericFileExclusiveReadLockStrategy<T>) params.get("exclusiveReadLockStrategy");
081            if (strategy != null) {
082                return strategy;
083            }
084    
085            // no explicit stategy set then fallback to readLock option
086            String readLock = (String) params.get("readLock");
087            if (ObjectHelper.isNotEmpty(readLock)) {
088                if ("none".equals(readLock) || "false".equals(readLock)) {
089                    return null;
090                } else if ("rename".equals(readLock)) {
091                    GenericFileRenameExclusiveReadLockStrategy<T> readLockStrategy = new GenericFileRenameExclusiveReadLockStrategy<T>();
092                    Long timeout = (Long) params.get("readLockTimeout");
093                    if (timeout != null) {
094                        readLockStrategy.setTimeout(timeout);
095                    }
096                    return readLockStrategy;
097                }
098            }
099            return null;
100        }
101    }