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package org.scijava.convert;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

import org.scijava.plugin.Plugin;
import org.scijava.util.StringUtils;

/**
 * A collection of {@link Converter} plugins for going between {@link String},
 * {@link File} and {@code File[]}.
 *
 * @author Jan Eglinger
 * @author Curtis Rueden
 */
public class FileListConverters {
	// -- String to File (list) converters --

	@Plugin(type = Converter.class)
	public static class StringToFileConverter extends
		AbstractConverter<String, File>
	{

		@SuppressWarnings("unchecked")
		@Override
		public <T> T convert(final Object src, final Class<T> dest) {
			return (T) new File((String) src);
		}

		@Override
		public Class<File> getOutputType() {
			return File.class;
		}

		@Override
		public Class<String> getInputType() {
			return String.class;
		}

	}

	@Plugin(type = Converter.class)
	public static class StringToFileArrayConverter extends
		AbstractConverter<String, File[]>
	{

		@SuppressWarnings("unchecked")
		@Override
		public <T> T convert(final Object src, final Class<T> dest) {
			final String[] tokens = StringUtils.splitUnquoted((String) src, ",");
			final List<File> fileList = new ArrayList<>();
			for (final String filePath : tokens) {
				if ( filePath.isEmpty() )
					continue;
				fileList.add(new File(filePath.replaceAll("^\"|\"$", "")));
			}
			return (T) fileList.toArray(new File[fileList.size()]);
		}

		@Override
		public Class<File[]> getOutputType() {
			return File[].class;
		}

		@Override
		public Class<String> getInputType() {
			return String.class;
		}

	}

	// TODO add StringToFileListConverter

	// -- File (list) to String converters --

	@Plugin(type = Converter.class)
	public static class FileToStringConverter extends
		AbstractConverter<File, String>
	{

		@SuppressWarnings("unchecked")
		@Override
		public <T> T convert(final Object src, final Class<T> dest) {
			return (T) ((File) src).getAbsolutePath();
		}

		@Override
		public Class<String> getOutputType() {
			return String.class;
		}

		@Override
		public Class<File> getInputType() {
			return File.class;
		}

	}

	@Plugin(type = Converter.class)
	public static class FileArrayToStringConverter extends
		AbstractConverter<File[], String>
	{

		@SuppressWarnings("unchecked")
		@Override
		public <T> T convert(final Object src, final Class<T> dest) {
			final List<String> result = Arrays.asList((File[]) src).stream().map(
				f -> {
					final String path = f.getAbsolutePath();
					return path.contains(",") ? "\"" + path + "\"" : path;
				}).collect(Collectors.toList());
			return (T) String.join(",", result);
		}

		@Override
		public Class<String> getOutputType() {
			return String.class;
		}

		@Override
		public Class<File[]> getInputType() {
			return File[].class;
		}

	}

	// TODO add FileListToStringConverter
}
