FileReadingMessageSourceFactoryBean.java :  » J2EE » spring-integration-2.0.0.M2 » org » springframework » integration » file » config » Java Open Source

/*
 * Copyright 2002-2009 the original author or authors.
 *
 * Licensed 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.springframework.integration.file.config;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.integration.file.CompositeFileListFilter;
import org.springframework.integration.file.DirectoryScanner;
import org.springframework.integration.file.FileListFilter;
import org.springframework.integration.file.FileReadingMessageSource;
import org.springframework.integration.file.locking.BaseLockingFilter;

import java.io.File;
import java.util.Comparator;

/**
 * @author Mark Fisher
 * @author Iwein Fuld
 * @since 1.0.3
 */
public class FileReadingMessageSourceFactoryBean implements FactoryBean {

    private volatile FileReadingMessageSource source;

    private volatile File directory;

    private volatile FileListFilter filter;

    private volatile BaseLockingFilter locker;

    private volatile Comparator<File> comparator;

    private volatile DirectoryScanner scanner;

    private volatile Boolean scanEachPoll;

    private volatile Boolean autoCreateDirectory;

    private final Object initializationMonitor = new Object();

    public void setDirectory(File directory) {
        this.directory = directory;
    }

    public void setComparator(Comparator<File> comparator) {
        this.comparator = comparator;
    }

    public void setScanner(DirectoryScanner scanner) {
        this.scanner = scanner;
    }

    public void setFilter(FileListFilter filter) {
        this.filter = filter;
    }

    public void setScanEachPoll(Boolean scanEachPoll) {
        this.scanEachPoll = scanEachPoll;
    }

    public void setAutoCreateDirectory(Boolean autoCreateDirectory) {
        this.autoCreateDirectory = autoCreateDirectory;
    }

    public void setLocker(BaseLockingFilter locker) {
        this.locker = locker;
    }

    public Object getObject() throws Exception {
        if (this.source == null) {
            initSource();
        }
        return this.source;
    }

    public Class<?> getObjectType() {
        return FileReadingMessageSource.class;
    }

    public boolean isSingleton() {
        return true;
    }

    private void initSource() {
        synchronized (this.initializationMonitor) {
            if (this.source != null) {
                return;
            }
            this.source = (this.comparator != null) ?
                    new FileReadingMessageSource(this.comparator) : new FileReadingMessageSource();
            this.source.setDirectory(this.directory);
            if (this.filter != null) {
                if (this.locker == null) {
                    this.source.setFilter(this.filter);
                } else {
                    this.source.setFilter(new CompositeFileListFilter(this.filter, this.locker));
                    this.source.setLocker(locker);
                }
            }
            if (this.scanEachPoll != null) {
                this.source.setScanEachPoll(this.scanEachPoll);
            }
            if (this.autoCreateDirectory != null) {
                this.source.setAutoCreateDirectory(this.autoCreateDirectory);
            }
            if (this.scanner != null) {
                this.source.setScanner(this.scanner);
            }
            this.source.afterPropertiesSet();
        }
    }

}