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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.
package org.checkerframework.dataflow.cfg.node;
import java.util.Collection;
import java.util.Collections;
import javax.lang.model.type.TypeMirror;
import org.checkerframework.dataflow.util.HashCodeUtils;
import com.sun.source.tree.Tree;
/**
* A node for the string conversion operation. See JLS 5.1.11 for the definition
* of string conversion.
*
* 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".
*
* 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 accept(NodeVisitor 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 getOperands() {
return Collections.singletonList(getOperand());
}
}