de.invation.code.toval.graphic.dialog.ConditionalFileDialog Maven / Gradle / Ivy

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TOVAL comprises a set of java classes for common programming issues. It includes utils for arrays, lists, sets and collections for convenient handling and modification, but also support for mathematic definitions concerning logic (clauses + resolution) together with some algorithms for permutations, powersets and resolution. Additionally it contains a number of types for multisets, matrices with object keys and much more.

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package de.invation.code.toval.graphic.dialog;

import java.awt.Window;
import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

/**
 * This class can be used to request a file/directory with the help of a JFileChooserDialog.

 * It allows to customize the accepted files/directories by overriding the method {@link #isValid(File)}.

 * The user will be shown a JFileChooserDialog until he hits cancel or selects a valid file.
 * 
 * @author Thomas Stocker
 */
public abstract class ConditionalFileDialog {
	
	private JFileChooser fileChooser = null;
	private Window parent = null;

	public ConditionalFileDialog(Window parent, FileChooserType type, String title) {
		this.parent = parent;
		fileChooser = new JFileChooser();
		fileChooser.setDialogTitle(title);
		switch(type){
		case DIRECTORY:
			fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
			break;
		case FILE:
			fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
			break;
		}	
	}
	
	public String chooseFile(){
		while(fileChooser.showOpenDialog(parent) == JFileChooser.APPROVE_OPTION && !isValid(fileChooser.getSelectedFile())){
			JOptionPane.showMessageDialog(parent, getErrorMessage(), "Invalid or corrupted file/directory", JOptionPane.ERROR_MESSAGE);
		}
		if(fileChooser.getSelectedFile() == null)
			return null;
		return fileChooser.getSelectedFile().getAbsolutePath();
	}
	
	protected abstract String getErrorMessage();

	protected abstract boolean isValid(File file);
	
	public enum FileChooserType {
		DIRECTORY, FILE;
	}

}