/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jshell;

import java.util.Locale;

import javax.tools.Diagnostic;

/**

 * Diagnostic information for a Snippet.

 * @see jdk.jshell.JShell#diagnostics(jdk.jshell.Snippet)

 */

public abstract class Diag {

    // Simplified view on compiler Diagnostic.

    /**

     * Used to signal that no position is available.

     */

    public final static long NOPOS = Diagnostic.NOPOS;

    /**

     * @return true if this diagnostic is an error

     */

    public abstract boolean isError();

    /**

     * Returns a character offset from the beginning of the source object

     * associated with this diagnostic that indicates the location of

     * the problem.  In addition, the following must be true:

     *

     * <p>{@code getStartPostion() <= getPosition()}

     * <p>{@code getPosition() <= getEndPosition()}

     *

     * @return character offset from beginning of source; {@link

     * #NOPOS} if the position is not available.

     */

    public abstract long getPosition();

    /**

     * Returns the character offset from the beginning of the file

     * associated with this diagnostic that indicates the start of the

     * problem.

     *

     * @return offset from beginning of file; {@link #NOPOS} if and

     * only if {@link #getPosition()} returns {@link #NOPOS}

     */

    public abstract long getStartPosition();

    /**

     * Returns the character offset from the beginning of the file

     * associated with this diagnostic that indicates the end of the

     * problem.

     *

     * @return offset from beginning of file; {@link #NOPOS} if and

     * only if {@link #getPosition()} returns {@link #NOPOS}

     */

    public abstract long getEndPosition();

    /**

     * Returns a diagnostic code indicating the type of diagnostic.  The

     * code is implementation-dependent and might be {@code null}.

     *

     * @return a diagnostic code

     */

    public abstract String getCode();

    /**

     * Returns a localized message for the given locale.  The actual

     * message is implementation-dependent.  If the locale is {@code

     * null} use the default locale.

     *

     * @param locale a locale; might be {@code null}

     * @return a localized message

     */

    public abstract String getMessage(Locale locale);

    // *** Internal support ***

    /**

     * Internal: If this is from a compile/analyze wrapped in an outer class, extract the snippet.

     * Otherwise null.

     */

    Snippet snippetOrNull() {

        return null;

    }

    /**

     * This is an unreachable-statement error

     */

    boolean isUnreachableError() {

        return getCode().equals("compiler.err.unreachable.stmt");

    }

    /**

     * This is a not-a-statement error

     */

    boolean isNotAStatementError() {

        return getCode().equals("compiler.err.not.stmt");

    }

    /**

     * This is a resolution error.

     */

    boolean isResolutionError() {

        //TODO: try javac RESOLVE_ERROR flag

        return getCode().startsWith("compiler.err.cant.resolve")

                || getCode().equals("compiler.err.cant.apply.symbol");

    }

}