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Computes the AST difference between two Spoon abstract syntax trees using the Gumtree algorithm.

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package gumtree.spoon.builder;

import spoon.reflect.code.CtArrayAccess;
import spoon.reflect.code.CtBinaryOperator;
import spoon.reflect.code.CtConstructorCall;
import spoon.reflect.code.CtExpression;
import spoon.reflect.code.CtInvocation;
import spoon.reflect.code.CtLiteral;
import spoon.reflect.code.CtThisAccess;
import spoon.reflect.code.CtTypeAccess;
import spoon.reflect.code.CtUnaryOperator;
import spoon.reflect.code.CtVariableAccess;
import spoon.reflect.declaration.CtNamedElement;
import spoon.reflect.visitor.CtInheritanceScanner;

class NodeCreator extends CtInheritanceScanner {
	private final TreeScanner builder;

	NodeCreator(TreeScanner builder) {
		this.builder = builder;
	}

	@Override
	public void scanCtNamedElement(CtNamedElement e) {
		builder.addNodeToTree(builder.createNode(e, e.getSimpleName()));
	}

	@Override
	public > void scanCtArrayAccess(CtArrayAccess arrayAccess) {
		builder.addNodeToTree(builder.createNode(arrayAccess, arrayAccess.toString()));
	}

	@Override
	public  void scanCtVariableAccess(CtVariableAccess variableAccess) {
		if (variableAccess.getVariable() != null) {
			builder.addNodeToTree(builder.createNode(variableAccess, variableAccess.getVariable().getSimpleName()));
		}
	}

	@Override
	public  void visitCtInvocation(CtInvocation invocation) {
		if (invocation.getExecutable() != null) {
			builder.addNodeToTree(builder.createNode(invocation, invocation.getExecutable().getSignature()));
		}
	}

	@Override
	public  void visitCtConstructorCall(CtConstructorCall ctConstructorCall) {
		if (ctConstructorCall.getType() != null) {
			builder.addNodeToTree(builder.createNode(ctConstructorCall, ctConstructorCall.getExecutable().getSignature()));
		}
	}

	@Override
	public  void visitCtLiteral(CtLiteral literal) {
		builder.addNodeToTree(builder.createNode(literal, literal.toString()));
	}

	@Override
	public  void visitCtBinaryOperator(CtBinaryOperator operator) {
		builder.addNodeToTree(builder.createNode(operator, operator.getKind().toString()));
	}

	@Override
	public  void visitCtUnaryOperator(CtUnaryOperator operator) {
		builder.addNodeToTree(builder.createNode(operator, operator.getKind().toString()));
	}

	@Override
	public  void visitCtThisAccess(CtThisAccess thisAccess) {
		builder.addNodeToTree(builder.createNode(thisAccess, thisAccess.toString()));
	}

	@Override
	public  void visitCtTypeAccess(CtTypeAccess typeAccess) {
		builder.addNodeToTree(builder.createNode(typeAccess, typeAccess.getSignature()));
	}
}