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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.checker.signature;

import com.sun.source.tree.CompilationUnitTree;
import org.checkerframework.common.basetype.BaseTypeChecker;
import org.checkerframework.framework.qual.StubFiles;

/**
 * The Signature Checker.
 *
 * @checker_framework.manual #signature-checker Signature Checker
 */
// Don't use @RelevantJavaTypes.  Any object can be annotated, which should propagate through its
// toString().
// @RelevantJavaTypes(CharSequence.class)
@StubFiles({"javac.astub", "javaparser.astub"})
public final class SignatureChecker extends BaseTypeChecker {

  // This method is needed only under MacOS, perhaps as a result of the
  // broken Apple Java distribution.
  public SignatureAnnotatedTypeFactory createFactory(CompilationUnitTree root) {
    return new SignatureAnnotatedTypeFactory(this);
  }
}