dataflow.src.org.checkerframework.dataflow.cfg.node.SynchronizedNode 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;
*/

/*
 * This represents the start and end of synchronized code block.
 * If startOfBlock == true it is the node preceding a synchronized code block.
 * Otherwise it is the node immediately after a synchronized code block.
 */

import org.checkerframework.dataflow.util.HashCodeUtils;

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

import javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;

import com.sun.source.tree.Tree;

public class SynchronizedNode extends Node {

    protected /*@Nullable*/ Tree tree;
    protected Node expression;
    protected boolean startOfBlock;

    public SynchronizedNode(/*@Nullable*/ Tree tree, Node expression, boolean startOfBlock, Types types) {
        super(types.getNoType(TypeKind.NONE));
        this.tree = tree;
        this.expression = expression;
        this.startOfBlock = startOfBlock;
    }

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

    public Node getExpression() {
        return expression;
    }

    public boolean getIsStartOfBlock() {
        return startOfBlock;
    }

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

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("synchronized ");
        sb.append("(" + expression + ")");
        return sb.toString();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof SynchronizedNode)) {
            return false;
        }
        SynchronizedNode other = (SynchronizedNode) obj;
        if (tree == null && other.getTree() != null) {
            return false;
        }

        return getTree().equals(other.getTree())
                && getExpression().equals(other.getExpression())
                && startOfBlock == other.startOfBlock;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        if (tree != null) {
            hash = HashCodeUtils.hash(tree);
        }
        hash = HashCodeUtils.hash(startOfBlock);
        return HashCodeUtils.hash(hash, getExpression());
    }

    @Override
    public Collection getOperands() {
        return Collections.emptyList();
    }
}