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# Rotations - For AVL trees this is a double rotation for...

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package DataStructures; final class Rotations { /** * Rotate binary tree node with left child. * For AVL trees, this is a single rotation for case 1. */ static BinaryNode withLeftChild( BinaryNode k2 ) { BinaryNode k1 = k2.left; k2.left = k1.right; k1.right = k2; return k1; } /** * Rotate binary tree node with right child. * For AVL trees, this is a single rotation for case 4. */ static BinaryNode withRightChild( BinaryNode k1 ) { BinaryNode k2 = k1.right; k1.right = k2.left; k2.left = k1; return k2; } /** * Double rotate binary tree node: first left child * with its right child; then node k3 with new left child.
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Unformatted text preview: * For AVL trees, this is a double rotation for case 2. */ static BinaryNode doubleWithLeftChild( BinaryNode k3 ) { k3.left = withRightChild( k3.left ); return withLeftChild( k3 ); } /** * Double rotate binary tree node: first right child * with its left child; then node k1 with new right child. * For AVL trees, this is a double rotation for case 3. */ static BinaryNode doubleWithRightChild( BinaryNode k1 ) { k1.right = withLeftChild( k1.right ); return withRightChild( k1 ); } }...
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