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package org.checkerframework.dataflow.cfg.node;
import java.util.Collection;
import java.util.LinkedList;
import org.checkerframework.dataflow.cfg.node.AssignmentContext.AssignmentLhsContext;
import org.checkerframework.dataflow.util.HashCodeUtils;
import org.checkerframework.javacutil.InternalUtils;
import com.sun.source.tree.AssignmentTree;
import com.sun.source.tree.CompoundAssignmentTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.UnaryTree;
import com.sun.source.tree.VariableTree;
/**
* A node for an assignment:
*
* <pre>
* <em>variable</em> = <em>expression</em>
* <em>expression</em> . <em>field</em> = <em>expression</em>
* <em>expression</em> [ <em>index</em> ] = <em>expression</em>
* </pre>
*
* We allow assignments without corresponding AST {@link Tree}s.
*
* @author Stefan Heule
*
*/
public class AssignmentNode extends Node {
protected Tree tree;
protected Node lhs;
protected Node rhs;
public AssignmentNode(Tree tree, Node target, Node expression) {
super(InternalUtils.typeOf(tree));
assert tree instanceof AssignmentTree || tree instanceof VariableTree
|| tree instanceof CompoundAssignmentTree || tree instanceof UnaryTree;
assert target instanceof FieldAccessNode
|| target instanceof LocalVariableNode
|| target instanceof ArrayAccessNode;
this.tree = tree;
this.lhs = target;
this.rhs = expression;
rhs.setAssignmentContext(new AssignmentLhsContext(lhs));
}
public Node getTarget() {
return lhs;
}
public Node getExpression() {
return rhs;
}
@Override
public Tree getTree() {
return tree;
}
@Override
public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
return visitor.visitAssignment(this, p);
}
@Override
public String toString() {
return getTarget() + " = " + getExpression();
}
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof AssignmentNode)) {
return false;
}
AssignmentNode other = (AssignmentNode) obj;
return getTarget().equals(other.getTarget())
&& getExpression().equals(other.getExpression());
}
@Override
public int hashCode() {
return HashCodeUtils.hash(getTarget(), getExpression());
}
@Override
public Collection<Node> getOperands() {
LinkedList<Node> list = new LinkedList<Node>();
list.add(getTarget());
list.add(getExpression());
return list;
}
}
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