com.vaadin.flow.component.upload.receivers.AbstractFileBuffer Maven / Gradle / Ivy
/*
* Copyright 2000-2017 Vaadin Ltd.
*
* 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 com.vaadin.flow.component.upload.receivers;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Abstract class for common file receiver buffers.
*/
public abstract class AbstractFileBuffer implements Serializable {
private FileFactory factory;
/**
* Constructor for creating a file buffer with the default file factory.
*
* Files will be created using {@link File#createTempFile(String, String)}
* and have that build 'upload_tmpfile_{FILENAME}_{currentTimeMillis}'
*/
public AbstractFileBuffer() {
factory = fileName -> {
final String tempFileName = "upload_tmpfile_" + fileName + "_"
+ System.currentTimeMillis();
return File.createTempFile(tempFileName, null);
};
}
/**
* Constructor taking in the file factory used to create upload
* {@link File}.
*
* @param factory
* file factory for file buffer
*/
public AbstractFileBuffer(FileFactory factory) {
this.factory = factory;
}
/**
* Create a file output stream for filename
*
* @param fileName
* @return
*/
protected FileOutputStream createFileOutputStream(String fileName) {
try {
return new FileOutputStream(factory.createFile(fileName));
} catch (IOException e) {
getLogger().log(Level.SEVERE,
"Failed to create file output stream for: '" + fileName
+ "'",
e);
}
return null;
}
protected Logger getLogger() {
return Logger.getLogger(this.getClass().getName());
}
}