package pl.wroc.pwr.imagechannel.basic;

import pl.wroc.pwr.IOperator;
import pl.wroc.pwr.imagechannel.IImageChannel;
import pl.wroc.pwr.imagechannel.factory.ImageChannelFactory;

public class SubtractValue implements IOperator< IImageChannel >
{
	/**
	 *
	 */
	private static final long serialVersionUID = -6503593023056401910L;

	private IImageChannel inputChannel;
	private float value;
	private boolean inPlace;

	public SubtractValue( IImageChannel channel, float value, boolean inPlace ) {
		this.inputChannel = channel;
		this.value = value;
		this.inPlace = inPlace;
	}

	public void setInPlace( boolean inPlace ) {
		this.inPlace = inPlace;
	}

	public void setValue( float value ) {
		this.value = value;
	}

	public IImageChannel apply( ) {
		if ( this.inputChannel == null ) {
			return null;
		}
		IImageChannel outputChannel = this.inPlace ? this.inputChannel : new ImageChannelFactory(this.inputChannel).apply();
		final int maxIndex = this.inputChannel.getMaxIndex();
		for ( int i = 0; i < maxIndex; i++ ) {
			outputChannel.setValue( i, this.inputChannel.getValue( i ) - this.value );
		}
		return outputChannel;
	}
}