dataflow.src.org.checkerframework.dataflow.cfg.node.PackageNameNode 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.checker.nullness.qual.Nullable;
*/

import org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;
import org.checkerframework.javacutil.TreeUtils;

import java.util.Collection;
import java.util.Collections;

import javax.lang.model.element.Element;

import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.source.tree.Tree;

/**
 * A node representing a package name used in an expression such as a
 * constructor invocation
 *
 * 
 * package.class.object(...)
 * 
 * parent.package.class.object(...)
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class PackageNameNode extends Node {

    protected final Tree tree;
    /** The package named by this node */
    protected final Element element;

    /** The parent name, if any. */
    protected final /*@Nullable*/ PackageNameNode parent;

    public PackageNameNode(IdentifierTree tree) {
        super(InternalUtils.typeOf(tree));
        this.tree = tree;
        this.element = TreeUtils.elementFromUse(tree);
        this.parent = null;
    }

    public PackageNameNode(MemberSelectTree tree, PackageNameNode parent) {
        super(InternalUtils.typeOf(tree));
        this.tree = tree;
        this.element = TreeUtils.elementFromUse(tree);
        this.parent = parent;
    }

    public Element getElement() {
        return element;
    }

    public PackageNameNode getParent() {
        return parent;
    }

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

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

    @Override
    public String toString() {
        return getElement().getSimpleName().toString();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof PackageNameNode)) {
            return false;
        }
        PackageNameNode other = (PackageNameNode) obj;
        if (getParent() == null) {
            return other.getParent() == null
                    && getElement().equals(other.getElement());
        } else {
            return getParent().equals(other.getParent())
                    && getElement().equals(other.getElement());
        }
    }

    @Override
    public int hashCode() {
        if (parent == null) {
            return HashCodeUtils.hash(getElement());
        }
        return HashCodeUtils.hash(getElement(), getParent());
    }

    @Override
    public Collection getOperands() {
        if (parent == null) {
            return Collections.emptyList();
        }
        return Collections.singleton((Node) parent);
    }
}