| package org.checkerframework.dataflow.cfg.node; |
| |
| import com.sun.source.tree.Tree; |
| import java.util.Collection; |
| import java.util.Collections; |
| import javax.lang.model.type.TypeMirror; |
| import org.checkerframework.dataflow.util.HashCodeUtils; |
| |
| /** |
| * A node for the string conversion operation. See JLS 5.1.11 for the definition of string |
| * conversion. |
| * |
| * <p>A {@link StringConversionNode} does not correspond to any tree node in the parsed AST. It is |
| * introduced when a value of non-string type appears in a context that requires a {@link String}, |
| * such as in a string concatenation. A {@link StringConversionNode} should be treated as a |
| * potential call to the toString method of its operand, but does not necessarily call any method |
| * because null is converted to the string "null". |
| * |
| * <p>Conversion of primitive types to Strings requires first boxing and then string conversion. |
| * |
| * @author Stefan Heule |
| * @author Charlie Garrett |
| */ |
| public class StringConversionNode extends Node { |
| |
| protected Tree tree; |
| protected Node operand; |
| |
| // TODO: The type of a string conversion should be a final |
| // TypeMirror representing java.lang.String. Currently we require |
| // the caller to pass in a TypeMirror instead of creating one |
| // through the javax.lang.model.type.Types interface. |
| public StringConversionNode(Tree tree, Node operand, TypeMirror type) { |
| super(type); |
| this.tree = tree; |
| this.operand = operand; |
| } |
| |
| public Node getOperand() { |
| return operand; |
| } |
| |
| @Override |
| public Tree getTree() { |
| return tree; |
| } |
| |
| @Override |
| public <R, P> R accept(NodeVisitor<R, P> visitor, P p) { |
| return visitor.visitStringConversion(this, p); |
| } |
| |
| @Override |
| public String toString() { |
| return "StringConversion(" + getOperand() + ")"; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == null || !(obj instanceof StringConversionNode)) { |
| return false; |
| } |
| StringConversionNode other = (StringConversionNode) obj; |
| return getOperand().equals(other.getOperand()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return HashCodeUtils.hash(getOperand()); |
| } |
| |
| @Override |
| public Collection<Node> getOperands() { |
| return Collections.singletonList(getOperand()); |
| } |
| } |