Add some support

api/src/main/java/com/github/skjolber/packing/api/HorizontalSupport.java

@@ -0,0 +1,33 @@
+package com.github.skjolber.packing.api;
+
+import java.io.Serializable;
+
+public class HorizontalSupport implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+	private final SupportPlacement3D negative;
+	private final SupportPlacement3D positive;
+
+	private final long area;
+
+	public HorizontalSupport(SupportPlacement3D negative, SupportPlacement3D positive, long area) {
+		super();
+		this.negative = negative;
+		this.positive = positive;
+		this.area = area;
+	}
+
+	public SupportPlacement3D getNegative() {
+		return negative;
+	}
+
+	public SupportPlacement3D getPositive() {
+		return positive;
+	}
+
+	public long getArea() {
+		return area;
+	}
+
+}

api/src/main/java/com/github/skjolber/packing/api/SupportPlacement3D.java

@@ -0,0 +1,21 @@
+package com.github.skjolber.packing.api;
+
+import java.util.List;
+
+import com.github.skjolber.packing.api.Surface.Label;
+
+public interface SupportPlacement3D extends Placement3D {
+
+	List<VerticalSupport> getBottomSupports();
+
+	List<VerticalSupport> getTopSupports();
+
+	List<HorizontalSupport> getLeftSupports();
+
+	List<HorizontalSupport> getRightSupports();
+
+	List<HorizontalSupport> getFrontSupports();
+
+	List<HorizontalSupport> getRearSupports();
+
+}

api/src/main/java/com/github/skjolber/packing/api/SupportStackPlacement.java

@@ -0,0 +1,59 @@
+package com.github.skjolber.packing.api;
+
+import java.util.List;
+
+public class SupportStackPlacement extends StackPlacement implements SupportPlacement3D {
+
+	private static final long serialVersionUID = 1L;
+
+	protected List<VerticalSupport> bottomSupports;
+
+	protected List<VerticalSupport> topSupports;
+
+	protected List<HorizontalSupport> leftSupports;
+
+	protected List<HorizontalSupport> rightSupports;
+
+	protected List<HorizontalSupport> frontSupports;
+
+	protected List<HorizontalSupport> rearSupports;
+
+	public SupportStackPlacement() {
+		super();
+	}
+
+	public SupportStackPlacement(Stackable stackable, StackValue value, int x, int y, int z) {
+		super(stackable, value, x, y, z);
+	}
+
+	@Override
+	public List<VerticalSupport> getBottomSupports() {
+		return bottomSupports;
+	}
+
+	@Override
+	public List<VerticalSupport> getTopSupports() {
+		return topSupports;
+	}
+
+	@Override
+	public List<HorizontalSupport> getLeftSupports() {
+		return leftSupports;
+	}
+
+	@Override
+	public List<HorizontalSupport> getRightSupports() {
+		return rightSupports;
+	}
+
+	@Override
+	public List<HorizontalSupport> getFrontSupports() {
+		return frontSupports;
+	}
+
+	@Override
+	public List<HorizontalSupport> getRearSupports() {
+		return rearSupports;
+	}
+
+}

api/src/main/java/com/github/skjolber/packing/api/VerticalSupport.java

@@ -0,0 +1,44 @@
+package com.github.skjolber.packing.api;
+
+import java.io.Serializable;
+
+public class VerticalSupport implements Serializable {
+
+	private static final long serialVersionUID = 1L;
+
+	private final SupportPlacement3D negative;
+	private final SupportPlacement3D positive;
+
+	private final long area;
+
+	private int weightLimit;
+
+	public VerticalSupport(SupportPlacement3D negative, SupportPlacement3D positive, long area, int weightLimit) {
+		super();
+		this.negative = negative;
+		this.positive = positive;
+		this.area = area;
+		this.weightLimit = weightLimit;
+	}
+
+	public SupportPlacement3D getNegative() {
+		return negative;
+	}
+
+	public SupportPlacement3D getPositive() {
+		return positive;
+	}
+
+	public long getArea() {
+		return area;
+	}
+
+	public void decrementWeightLimit(int weightLimit) {
+		this.weightLimit -= weightLimit;
+	}
+
+	public int getWeightLimit() {
+		return weightLimit;
+	}
+
+}