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package org.openjdk.jmc.greychart.providers;

import org.openjdk.jmc.greychart.impl.SamplePoint;

/**
 * A sample counting buffer for the {@link SampleCountingProvider}.
 * <p>
 * Each bucket represents the number of samples that start in the bucket.
 */
public class SampleCountingBuffer extends AbstractSampler {

	public SampleCountingBuffer(int size) {
		super(size);
		for (int n = 0; n < getSize(); n++) {
			getSamplePoint(n); // All sample points should exist
		}
	}

	public void addDataPoint(double normalizedX, double currentY) {
		if (normalizedX < 0 || normalizedX > 1.0) {
			throw new IllegalArgumentException("Must add a normalized value [0, 1]! Value was " + normalizedX); //$NON-NLS-1$
		}
		addSamplePoint(getSize() * normalizedX, currentY);
	}

	private void addSamplePoint(double currentX, double currentY) {
		int currentIndex = getIndex(currentX);
		if (currentIndex >= 0 && currentIndex < getSize()) {
			SamplePoint sp = getSamplePoint(currentIndex);
			sp.count++;
			sp.y++;
			invalidateStatistics();
		}
	}
}
