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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.framework.test.diagnostics;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * Indicates what type of Error was, or expected to be, encountered during typechecking
 */
public enum DiagnosticKind {
    Warning("warning"),
    Error("error"),
    Other("other");

    /**
     * How the diagnostic identifier actually appears in error messages or source code
     */
    public final String parseString;

    DiagnosticKind(String parseString) {
        this.parseString = parseString;
    }

    private static final Map stringToCategory = new LinkedHashMap<>();
    static {
        for (DiagnosticKind cat : values()) {
            stringToCategory.put(cat.parseString, cat);
        }
    }

    /**
     * Convert a string as it would appear in error messages or source code into a DiagnosticKind
     */
    public static DiagnosticKind fromParseString(String parseStr) {
        return stringToCategory.get(parseStr);
    }
}