private AbstractSampler createSampleBuffer()

in application/org.openjdk.jmc.greychart/src/main/java/org/openjdk/jmc/greychart/providers/SubsamplingProvider.java [195:254]
54 lines of code
26 McCabe index (conditional complexity)

	private AbstractSampler createSampleBuffer(int width) {
		Iterator<IXYData> it = m_dataSeries.createIterator(m_requestedStartX, m_requestedEndX);
		if (!it.hasNext()) {
			return isIntegrate() ? new IntegratingSubsamplingBuffer(0) : new SubsamplingBuffer(0);
		}

		AbstractSampler sampleBuffer = isIntegrate() ? new IntegratingSubsamplingBuffer(width)
				: new SubsamplingBuffer(width);
		long worldWidth = m_xAxis.getMax().longValue() - m_xAxis.getMin().longValue();
		long leftEdge = m_xAxis.getMin().longValue();
		long rightEdge = leftEdge + worldWidth;

		IXYData leftMost = null;
		IXYData rightMost = null;
		IXYData rightMostWithin = null;
		IXYData leftMostWithin = null;

		while (it.hasNext() && m_cancelService.isNotCancelled()) {
			IXYData newData = it.next();
			long x = getXAsLong(newData);
			if (x < leftEdge && (leftMost == null || x >= getXAsLong(leftMost))) {
				leftMost = newData;
			} else if (x > rightEdge && (rightMost == null || x < getXAsLong(rightMost))) {
				rightMost = newData;
			}
			if (x >= leftEdge && x <= rightEdge) {
				addXYDataPoint(sampleBuffer, worldWidth, leftEdge, newData);
				if (leftMostWithin == null) {
					leftMostWithin = newData;
					rightMostWithin = newData;
				} else {
					if (getXAsLong(leftMostWithin) > x) {
						leftMostWithin = newData;
					} else if (getXAsLong(rightMostWithin) <= x) {
						rightMostWithin = newData;
					}
				}
			}
		}

		if (isIntegrate()) {
			((IntegratingSubsamplingBuffer) sampleBuffer).fixSamples();
		} else {
			// If we had a sample left of the left edge, or right of the right edge, we must add an interpolated
			// sample at the edge (unless the actual internal values were already on the borders).
			leftMostWithin = leftMostWithin == null ? rightMost : leftMostWithin;
			rightMostWithin = rightMostWithin == null ? leftMost : rightMostWithin;
			if (leftMost != null && leftMostWithin != null && getXAsLong(leftMostWithin) != leftEdge
					&& getXAsLong(leftMost) < leftEdge) {
				addInterpolatedNormalizedPoint((SubsamplingBuffer) sampleBuffer, 0.0, leftMost, leftMostWithin,
						worldWidth, leftEdge);
			}
			if (rightMost != null && rightMostWithin != null && getXAsLong(rightMostWithin) != rightEdge
					&& getXAsLong(rightMost) > rightEdge) {
				addInterpolatedNormalizedPoint((SubsamplingBuffer) sampleBuffer, 1.0, rightMostWithin, rightMost,
						worldWidth, leftEdge);
			}
		}
		return sampleBuffer;
	}