/*

 * Copyright 2003-2008 Sun Microsystems, Inc.  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.  Sun designates this

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

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.javac.util;

import java.util.Locale;

import java.util.Map;

import javax.tools.Diagnostic;

import javax.tools.JavaFileObject;

import com.sun.tools.javac.file.JavacFileManager;

import com.sun.tools.javac.tree.JCTree;

import static com.sun.tools.javac.util.JCDiagnostic.DiagnosticType.*;

/** An abstraction of a diagnostic message generated by the compiler.

 *

 *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

 *  you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class JCDiagnostic implements Diagnostic<JavaFileObject> {

    /** A factory for creating diagnostic objects. */

    public static class Factory {

        /** The context key for the diagnostic factory. */

        protected static final Context.Key<JCDiagnostic.Factory> diagnosticFactoryKey =

            new Context.Key<JCDiagnostic.Factory>();

        /** Get the Factory instance for this context. */

        public static Factory instance(Context context) {

            Factory instance = context.get(diagnosticFactoryKey);

            if (instance == null)

                instance = new Factory(context);

            return instance;

        }

        final Messages messages;

        final String prefix;

        /** Create a new diagnostic factory. */

        protected Factory(Context context) {

            context.put(diagnosticFactoryKey, this);

            messages = Messages.instance(context);

            prefix = "compiler";

        }

        /** Create a new diagnostic factory. */

        public Factory(Messages messages, String prefix) {

            this.messages = messages;

            this.prefix = prefix;

        }

        /**

         * Create an error diagnostic.

         *  @param source The source of the compilation unit, if any, in which to report the error.

         *  @param pos    The source position at which to report the error.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         */

        public JCDiagnostic error(

                DiagnosticSource source, DiagnosticPosition pos, String key, Object... args) {

            return new JCDiagnostic(messages, ERROR, true, source, pos, qualify(ERROR, key), args);

        }

        /**

         * Create a warning diagnostic that will not be hidden by the -nowarn or -Xlint:none options.

         *  @param source The source of the compilation unit, if any, in which to report the warning.

         *  @param pos    The source position at which to report the warning.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         *  @see MandatoryWarningHandler

         */

        public JCDiagnostic mandatoryWarning(

                 DiagnosticSource source, DiagnosticPosition pos, String key, Object... args) {

            return new JCDiagnostic(messages, WARNING, true, source, pos, qualify(WARNING, key), args);

        }

        /**

         * Create a warning diagnostic.

         *  @param source The source of the compilation unit, if any, in which to report the warning.

         *  @param pos    The source position at which to report the warning.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         */

        public JCDiagnostic warning(

                DiagnosticSource source, DiagnosticPosition pos, String key, Object... args) {

            return new JCDiagnostic(messages, WARNING, false, source, pos, qualify(WARNING, key), args);

        }

        /**

         * Create a note diagnostic that will not be hidden by the -nowarn or -Xlint:none options.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         *  @see MandatoryWarningHandler

         */

        public JCDiagnostic mandatoryNote(DiagnosticSource source, String key, Object... args) {

            return new JCDiagnostic(messages, NOTE, true, source, null, qualify(NOTE, key), args);

        }

        /**

         * Create a note diagnostic.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         */

        public JCDiagnostic note(String key, Object... args) {

            return note(null, null, key, args);

        }

        /**

         * Create a note diagnostic.

         *  @param source The source of the compilation unit, if any, in which to report the note.

         *  @param pos    The source position at which to report the note.

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         */

        public JCDiagnostic note(

                DiagnosticSource source, DiagnosticPosition pos, String key, Object... args) {

            return new JCDiagnostic(messages, NOTE, false, source, pos, qualify(NOTE, key), args);

        }

        /**

         * Create a fragment diagnostic, for use as an argument in other diagnostics

         *  @param key    The key for the localized error message.

         *  @param args   Fields of the error message.

         */

        public JCDiagnostic fragment(String key, Object... args) {

            return new JCDiagnostic(messages, FRAGMENT, false, null, null, qualify(FRAGMENT, key), args);

        }

        protected String qualify(DiagnosticType t, String key) {

            return prefix + "." + t.key + "." + key;

        }

    }

    /**

     * Create a fragment diagnostic, for use as an argument in other diagnostics

     *  @param key    The key for the localized error message.

     *  @param args   Fields of the error message.

     */

    // should be deprecated

    public static JCDiagnostic fragment(String key, Object... args) {

        return new JCDiagnostic(Messages.getDefaultMessages(),

                              FRAGMENT,

                              false,

                              null,

                              null,

                              "compiler." + FRAGMENT.key + "." + key,

                              args);

    }

    /**

     * A DiagnosticType defines the type of the diagnostic.

     **/

    public enum DiagnosticType {

        /** A fragment of an enclosing diagnostic. */

        FRAGMENT("misc"),

        /** A note: similar to, but less serious than, a warning. */

        NOTE("note"),

        /** A warning. */

        WARNING("warn"),

        /** An error. */

        ERROR("err");

        final String key;

        /** Create a DiagnosticType.

         * @param key A string used to create the resource key for the diagnostic.

         */

        DiagnosticType(String key) {

            this.key = key;

        }

    };

    /**

     * A DiagnosticPosition provides information about the positions in a file

     * that gave rise to a diagnostic. It always defines a "preferred" position

     * that most accurately defines the location of the diagnostic, it may also

     * provide a related tree node that spans that location.

     */

    public static interface DiagnosticPosition {

        /** Gets the tree node, if any, to which the diagnostic applies. */

        JCTree getTree();

        /** If there is a tree node, get the start position of the tree node.

         *  Otherwise, just returns the same as getPreferredPosition(). */

        int getStartPosition();

        /** Get the position within the file that most accurately defines the

         *  location for the diagnostic. */

        int getPreferredPosition();

        /** If there is a tree node, and if endPositions are available, get

         *  the end position of the tree node. Otherwise, just returns the

         *  same as getPreferredPosition(). */

        int getEndPosition(Map<JCTree, Integer> endPosTable);

    }

    /**

     * A DiagnosticPosition that simply identifies a position, but no related

     * tree node, as the location for a diagnostic. Used for scanner and parser

     * diagnostics. */

    public static class SimpleDiagnosticPosition implements DiagnosticPosition {

        public SimpleDiagnosticPosition(int pos) {

            this.pos = pos;

        }

        public JCTree getTree() {

            return null;

        }

        public int getStartPosition() {

            return pos;

        }

        public int getPreferredPosition() {

            return pos;

        }

        public int getEndPosition(Map<JCTree, Integer> endPosTable) {

            return pos;

        }

        private final int pos;

    }

    private final Messages messages;

    private final DiagnosticType type;

    private final DiagnosticSource source;

    private final DiagnosticPosition position;

    private final int line;

    private final int column;

    private final String key;

    private final Object[] args;

    private boolean mandatory;

    /**

     * Create a diagnostic object.

     * @param messages the resource for localized messages

     * @param dt the type of diagnostic

     * @param name the name of the source file, or null if none.

     * @param pos the character offset within the source file, if given.

     * @param key a resource key to identify the text of the diagnostic

     * @param args arguments to be included in the text of the diagnostic

     */

    protected JCDiagnostic(Messages messages,

                       DiagnosticType dt,

                       boolean mandatory,

                       DiagnosticSource source,

                       DiagnosticPosition pos,

                       String key,

                       Object ... args) {

        if (source == null && pos != null && pos.getPreferredPosition() != Position.NOPOS)

            throw new IllegalArgumentException();

        this.messages = messages;

        this.type = dt;

        this.mandatory = mandatory;

        this.source = source;

        this.position = pos;

        this.key = key;

        this.args = args;

        int n = (pos == null ? Position.NOPOS : pos.getPreferredPosition());

        if (n == Position.NOPOS || source == null)

            line = column = -1;

        else {

            line = source.getLineNumber(n);

            column = source.getColumnNumber(n);

        }

    }

    /**

     * Get the type of this diagnostic.

     * @return the type of this diagnostic

     */

    public DiagnosticType getType() {

        return type;

    }

    /**

     * Check whether or not this diagnostic is required to be shown.

     * @return true if this diagnostic is required to be shown.

     */

    public boolean isMandatory() {

        return mandatory;

    }

    /**

     * Get the name of the source file referred to by this diagnostic.

     * @return the name of the source referred to with this diagnostic, or null if none

     */

    public JavaFileObject getSource() {

        if (source == null)

            return null;

        else

            return source.getFile();

    }

    /**

     * Get the name of the source file referred to by this diagnostic.

     * @return the name of the source referred to with this diagnostic, or null if none

     */

    public String getSourceName() {

        JavaFileObject s = getSource();

        return s == null ? null : JavacFileManager.getJavacFileName(s);

    }

    /**

     * Get the source referred to by this diagnostic.

     * @return the source referred to with this diagnostic, or null if none

     */

    public DiagnosticSource getDiagnosticSource() {

        return source;

    }

    protected int getIntStartPosition() {

        return (position == null ? Position.NOPOS : position.getStartPosition());

    }

    protected int getIntPosition() {

        return (position == null ? Position.NOPOS : position.getPreferredPosition());

    }

    protected int getIntEndPosition() {

        return (position == null ? Position.NOPOS : position.getEndPosition(source.getEndPosTable()));

    }

    public long getStartPosition() {

        return getIntStartPosition();

    }

    public long getPosition() {

        return getIntPosition();

    }

    public long getEndPosition() {

        return getIntEndPosition();

    }

    /**

     * Get the line number within the source referred to by this diagnostic.

     * @return  the line number within the source referred to by this diagnostic

     */

    public long getLineNumber() {

        return line;

    }

    /**

     * Get the column number within the line of source referred to by this diagnostic.

     * @return  the column number within the line of source referred to by this diagnostic

     */

    public long getColumnNumber() {

        return column;

    }

    /**

     * Get the arguments to be included in the text of the diagnostic.

     * @return  the arguments to be included in the text of the diagnostic

     */

    public Object[] getArgs() {

        return args;

    }

    /**

     * Get the prefix string associated with this type of diagnostic.

     * @return the prefix string associated with this type of diagnostic

     */

    public String getPrefix() {

        return getPrefix(type);

    }

    /**

     * Get the prefix string associated with a particular type of diagnostic.

     * @return the prefix string associated with a particular type of diagnostic

     */

    public String getPrefix(DiagnosticType dt) {

        switch (dt) {

        case FRAGMENT: return "";

        case NOTE:     return getLocalizedString("compiler.note.note");

        case WARNING:  return getLocalizedString("compiler.warn.warning");

        case ERROR:    return getLocalizedString("compiler.err.error");

        default:

            throw new AssertionError("Unknown diagnostic type: " + dt);

        }

    }

    /**

     * Return the standard presentation of this diagnostic.

     */

    public String toString() {

        if (defaultFormatter == null) {

            defaultFormatter =

                new DiagnosticFormatter();

        }

        return defaultFormatter.format(this);

    }

    private static DiagnosticFormatter defaultFormatter;

    private static final String messageBundleName =

        "com.sun.tools.javac.resources.compiler";

    private String getLocalizedString(String key, Object... args) {

        String[] strings = new String[args.length];

        for (int i = 0; i < strings.length; i++) {

            Object arg = args[i];

            if (arg == null)

                strings[i] = null;

            else if (arg instanceof JCDiagnostic)

                strings[i] = ((JCDiagnostic) arg).getMessage(null);

            else

                strings[i] = arg.toString();

        }

        return messages.getLocalizedString(key, (Object[]) strings);

    }

    // Methods for javax.tools.Diagnostic

    public Diagnostic.Kind getKind() {

        switch (type) {

        case NOTE:

            return Diagnostic.Kind.NOTE;

        case WARNING:

            return mandatory ? Diagnostic.Kind.MANDATORY_WARNING

                             : Diagnostic.Kind.WARNING;

        case ERROR:

            return Diagnostic.Kind.ERROR;

        default:

            return Diagnostic.Kind.OTHER;

        }

    }

    public String getCode() {

        return key;

    }

    public String getMessage(Locale locale) {

        // RFE 6406133: JCDiagnostic.getMessage ignores locale argument

        return getLocalizedString(key, args);

    }

}