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/*
* Copyright 2019 Serge Merzliakov
*
* 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
*
* https://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.epistatic.app3.controller
import com.google.common.eventbus.EventBus
import com.google.common.eventbus.Subscribe
import javafx.fxml.FXML
import javafx.scene.control.Label
import javafx.scene.control.TextArea
import org.epistatic.app3.event.FileAddedEvent
import org.epistatic.app3.event.FileSelectedEvent
import java.io.File
import java.nio.charset.Charset
private const val PREVIEW_BYTES = 8192
/**
* Controller for app3/fileData.fxml - which displays the contents of file in a TextArea
*/
class FileDataController(eventBus: EventBus) : EventAwareController(eventBus) {
// view
@FXML lateinit var fileContentsArea: TextArea
@FXML lateinit var fileContentsLabel: Label
@Subscribe
fun handleFileAdded(e: FileAddedEvent) {
println("FileDataController processing FileAddedEvent")
loadAndDisplayContents(e.file)
}
@Subscribe
fun handleFileSelectionChanged(e: FileSelectedEvent) {
println("FileDataController processing FileSelectedEvent")
loadAndDisplayContents(e.file)
}
/**
* Either load the whole file or a preview of it.
*/
private fun loadAndDisplayContents(file: File) {
if (file.length() < PREVIEW_BYTES) {
fileContentsArea.text = String(file.readBytes(), Charset.defaultCharset())
fileContentsLabel.text = "Full File Contents"
} else {
// preview first PREVIEW_BYTES only - could be a very large file!
val stream = file.inputStream()
val bytes = stream.readNBytes(PREVIEW_BYTES)
fileContentsArea.text = String(bytes, Charset.defaultCharset())
fileContentsLabel.text = "File Content Preview - First $PREVIEW_BYTES Bytes Only"
}
}
}