package innovimax.mixthem.io;

import java.io.IOException;
import java.util.ArrayList;
//import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class MultiChannelCharReader implements IMultiChannelCharInput {
	
	//private final List<ICharInput> readers = new ArrayList<ICharInput>();
	private final List<ICharInput> readers;
	
	/**
	* Constructor
	* @param inputs The list of inputs as InputResource
	* @param selection The input index selection (maybe empty)
	* @see innovimax.mixthem.io.InputResource
	*/
	public MultiChannelCharReader(final List<InputResource> inputs, final Set<Integer> selection) {		
		/*IntStream.rangeClosed(1, inputs.size())
			.filter(index -> selection.isEmpty() || selection.contains(Integer.valueOf(index)))
			.mapToObj(index -> inputs.get(index-1))
			.forEachOrdered(input -> {
				try {
					this.readers.add(new DefaultCharReader(input));
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			});*/
		this.reader = IntStream.rangeClosed(1, inputs.size())
			.filter(index -> selection.isEmpty() || selection.contains(Integer.valueOf(index)))
			.mapToObj(index -> inputs.get(index-1))
			.mapToObj(input -> {
				try {
					return new DefaultCharReader(input);
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			})
			.collect(Collectors.toList());
	}
	
	@Override
	public boolean hasCharacter() throws IOException {
		return this.readers.stream()
			.anyMatch(reader -> {
				try {
					return reader.hasCharacter();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}		
			});
	}
	
	@Override
	public int[] nextCharacterRange() throws IOException {
		return readers.stream()
			.mapToInt(reader -> {
				try {
					return reader.nextCharacter();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}	
			})
			.toArray();
	}

	@Override
	public void close() throws IOException {
		this.readers.forEach(reader -> {
			try {
				reader.close();
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		});
	}
	
}

package innovimax.mixthem.io;

import java.io.IOException;
//import java.util.ArrayList;
//import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class MultiChannelCharReader implements IMultiChannelCharInput {
	
	//private final List<ICharInput> readers = new ArrayList<ICharInput>();
	private final List<ICharInput> readers;
	
	/**
	* Constructor
	* @param inputs The list of inputs as InputResource
	* @param selection The input index selection (maybe empty)
	* @see innovimax.mixthem.io.InputResource
	*/
	public MultiChannelCharReader(final List<InputResource> inputs, final Set<Integer> selection) {		
		/*IntStream.rangeClosed(1, inputs.size())
			.filter(index -> selection.isEmpty() || selection.contains(Integer.valueOf(index)))
			.mapToObj(index -> inputs.get(index-1))
			.forEachOrdered(input -> {
				try {
					this.readers.add(new DefaultCharReader(input));
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			});*/
		this.reader = IntStream.rangeClosed(1, inputs.size())
			.filter(index -> selection.isEmpty() || selection.contains(Integer.valueOf(index)))
			.mapToObj(index -> inputs.get(index-1))
			.mapToObj(input -> {
				try {
					return new DefaultCharReader(input);
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			})
			.collect(Collectors.toList());
	}
	
	@Override
	public boolean hasCharacter() throws IOException {
		return this.readers.stream()
			.anyMatch(reader -> {
				try {
					return reader.hasCharacter();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}		
			});
	}
	
	@Override
	public int[] nextCharacterRange() throws IOException {
		return readers.stream()
			.mapToInt(reader -> {
				try {
					return reader.nextCharacter();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}	
			})
			.toArray();
	}

	@Override
	public void close() throws IOException {
		this.readers.forEach(reader -> {
			try {
				reader.close();
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		});
	}
	
}

Update MultiChannelCharReader.java