dataflow.src.org.checkerframework.dataflow.cfg.node.FunctionalInterfaceNode Maven / Gradle / Ivy

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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import org.checkerframework.javacutil.ErrorReporter;
import org.checkerframework.javacutil.InternalUtils;

import java.util.Collection;
import java.util.LinkedList;

import com.sun.source.tree.LambdaExpressionTree;
import com.sun.source.tree.MemberReferenceTree;
import com.sun.source.tree.Tree;

/**
 * A node for member references and lambdas.
 *
 * The {@link Node#type} of a FunctionalInterfaceNode is determined by the
 * assignment context the member reference or lambda is used in.
 *
 *  *   FunctionalInterface func = param1, param2, ... -> statement
 * 
 *
 *  *   FunctionalInterface func = param1, param2, ... -> { ... }
 * 
 *
 *  *   FunctionalInterface func = member reference
 * 
 *
 * @author David
 *
 */
public class FunctionalInterfaceNode extends Node {

    protected Tree tree;

    public FunctionalInterfaceNode(MemberReferenceTree tree) {
        super(InternalUtils.typeOf(tree));
        this.tree = tree;
    }

    public FunctionalInterfaceNode(LambdaExpressionTree tree) {
        super(InternalUtils.typeOf(tree));
        this.tree = tree;
    }

    @Override
    public Tree getTree() {
        return tree;
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitMemberReference(this, p);
    }

    @Override
    public String toString() {
        if (tree instanceof LambdaExpressionTree) {
            return "FunctionalInterfaceNode:" + ((LambdaExpressionTree) tree).getBodyKind();
        } else if (tree instanceof MemberReferenceTree) {
            return "FunctionalInterfaceNode:" + ((MemberReferenceTree) tree).getName();
        } else {
            // This should never happen.
            ErrorReporter.errorAbort("Invalid tree in FunctionalInterfaceNode");
            return null; // Dead code
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        FunctionalInterfaceNode that = (FunctionalInterfaceNode) o;

        if (tree != null ? !tree.equals(that.tree) : that.tree != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return tree != null ? tree.hashCode() : 0;
    }

    @Override
    public Collection getOperands() {
        LinkedList list = new LinkedList();
        return list;
    }
}