/*

 * Copyright (c) 2002, 2018, 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 com.sun.tools.javac.jvm;

import java.util.*;

import com.sun.tools.javac.code.Flags;

import com.sun.tools.javac.code.Symbol;

import com.sun.tools.javac.util.*;

import static com.sun.tools.javac.main.Option.TARGET;

/** The classfile version target.

 *

 *  <p><b>This is NOT part of any supported API.

 *  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 enum Target {

    JDK1_1("1.1", 45, 3),

    JDK1_2("1.2", 46, 0),

    JDK1_3("1.3", 47, 0),

    /** J2SE1.4 = Merlin. */

    JDK1_4("1.4", 48, 0),

    /** JDK 5, codename Tiger. */

    JDK1_5("5", 49, 0),

    /** JDK 6. */

    JDK1_6("6", 50, 0),

    /** JDK 7. */

    JDK1_7("7", 51, 0),

    /** JDK 8. */

    JDK1_8("8", 52, 0),

    /** JDK 9. */

    JDK1_9("9", 53, 0),

    /** JDK 10. */

    JDK1_10("10", 54, 0),

    /** JDK 11. */

    JDK1_11("11", 55, 0),

    /** JDK 12. */

    private static final Context.Key<Target> targetKey = new Context.Key<>();

    public static Target instance(Context context) {

        Target instance = context.get(targetKey);

        if (instance == null) {

            Options options = Options.instance(context);

            String targetString = options.get(TARGET);

            if (targetString != null) instance = lookup(targetString);

            if (instance == null) instance = DEFAULT;

            context.put(targetKey, instance);

        }

        return instance;

    }

    public static final Target MIN = Target.JDK1_7;

    private static final Target MAX = values()[values().length - 1];

    private static final Map<String,Target> tab = new HashMap<>();

    static {

        for (Target t : values()) {

            tab.put(t.name, t);

        }

        tab.put("1.5", JDK1_5);

        tab.put("1.6", JDK1_6);

        tab.put("1.7", JDK1_7);

        tab.put("1.8", JDK1_8);

        tab.put("1.9", JDK1_9);

        tab.put("1.10", JDK1_10);

    }

    public final String name;

    public final int majorVersion;

    public final int minorVersion;

    private Target(String name, int majorVersion, int minorVersion) {

        this.name = name;

        this.majorVersion = majorVersion;

        this.minorVersion = minorVersion;

    }

    public static final Target DEFAULT = values()[values().length - 1];

    public static Target lookup(String name) {

        return tab.get(name);

    }

    public boolean isSupported() {

        return this.compareTo(MIN) >= 0;

    }

    /** Return the character to be used in constructing synthetic

     *  identifiers, where not specified by the JLS.

     */

    public char syntheticNameChar() {

        return '$';

    }

    /** Does the target VM expect MethodParameters attributes?

     */

    public boolean hasMethodParameters() {

        return compareTo(JDK1_8) >= 0;

    }

    /** Does the target JDK contain StringConcatFactory class?

     */

    public boolean hasStringConcatFactory() {

        return compareTo(JDK1_9) >= 0;

    }

    /** Value of platform release used to access multi-release jar files

     */

    public String multiReleaseValue() {

        return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);

    }

    /** All modules that export an API are roots when compiling code in the unnamed

     *  module and targeting 11 or newer.

     */

    public boolean allApiModulesAreRoots() {

        return compareTo(JDK1_11) >= 0;

    }

    /** Does the target VM support nestmate access?

     */

    public boolean hasNestmateAccess() {

        return compareTo(JDK1_11) >= 0;

    }

    /** Does the target VM support virtual private invocations?

     */

    public boolean hasVirtualPrivateInvoke() {

        return compareTo(JDK1_11) >= 0;

    }

}