/*

 * Copyright (c) 2002, 2011, 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.code;

import java.util.*;

import javax.lang.model.SourceVersion;

import static javax.lang.model.SourceVersion.*;

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

import com.sun.tools.javac.jvm.Target;

import static com.sun.tools.javac.main.OptionName.*;

/** The source language version accepted.

 *

 *  <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 Source {

    /** 1.0 had no inner classes, and so could not pass the JCK. */

    // public static final Source JDK1_0 =              new Source("1.0");

    /** 1.1 did not have strictfp, and so could not pass the JCK. */

    // public static final Source JDK1_1 =              new Source("1.1");

    /** 1.2 introduced strictfp. */

    JDK1_2("1.2"),

    /** 1.3 is the same language as 1.2. */

    JDK1_3("1.3"),

    /** 1.4 introduced assert. */

    JDK1_4("1.4"),

    /** 1.5 introduced generics, attributes, foreach, boxing, static import,

     *  covariant return, enums, varargs, et al. */

    JDK1_5("1.5"),

    /** 1.6 reports encoding problems as errors instead of warnings. */

    JDK1_6("1.6"),

    /** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */

    JDK1_7("1.7"),

    /** 1.8 covers the to be determined language features that will be added in JDK 8. */

    JDK1_8("1.8");

    private static final Context.Key<Source> sourceKey

        = new Context.Key<Source>();

    public static Source instance(Context context) {

        Source instance = context.get(sourceKey);

        if (instance == null) {

            Options options = Options.instance(context);

            String sourceString = options.get(SOURCE);

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

            if (instance == null) instance = DEFAULT;

            context.put(sourceKey, instance);

        }

        return instance;

    }

    public final String name;

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

    static {

        for (Source s : values()) {

            tab.put(s.name, s);

        }

        tab.put("5", JDK1_5); // Make 5 an alias for 1.5

        tab.put("6", JDK1_6); // Make 6 an alias for 1.6

        tab.put("7", JDK1_7); // Make 7 an alias for 1.7

        tab.put("8", JDK1_8); // Make 8 an alias for 1.8

    }

    private Source(String name) {

        this.name = name;

    }

    public static final Source DEFAULT = JDK1_8;

    public static Source lookup(String name) {

        return tab.get(name);

    }

    public Target requiredTarget() {

        if (this.compareTo(JDK1_8) >= 0) return Target.JDK1_8;

        if (this.compareTo(JDK1_7) >= 0) return Target.JDK1_7;

        if (this.compareTo(JDK1_6) >= 0) return Target.JDK1_6;

        if (this.compareTo(JDK1_5) >= 0) return Target.JDK1_5;

        if (this.compareTo(JDK1_4) >= 0) return Target.JDK1_4;

        return Target.JDK1_1;

    }

    /** Allow encoding errors, giving only warnings. */

    public boolean allowEncodingErrors() {

        return compareTo(JDK1_6) < 0;

    }

    public boolean allowAsserts() {

        return compareTo(JDK1_4) >= 0;

    }

    public boolean allowCovariantReturns() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowGenerics() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowDiamond() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowMulticatch() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowImprovedRethrowAnalysis() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowImprovedCatchAnalysis() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowEnums() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowForeach() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowStaticImport() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowBoxing() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowVarargs() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowAnnotations() {

        return compareTo(JDK1_5) >= 0;

    }

    // hex floating-point literals supported?

    public boolean allowHexFloats() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowAnonOuterThis() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean addBridges() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean enforceMandatoryWarnings() {

        return compareTo(JDK1_5) >= 0;

    }

    public boolean allowTryWithResources() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowTypeAnnotations() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowBinaryLiterals() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowUnderscoresInLiterals() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowStringsInSwitch() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowSimplifiedVarargs() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowObjectToPrimitiveCast() {

        return compareTo(JDK1_7) >= 0;

    }

    public boolean allowLambda() {

        return compareTo(JDK1_8) >= 0;

    }

    public static SourceVersion toSourceVersion(Source source) {

        switch(source) {

        case JDK1_2:

            return RELEASE_2;

        case JDK1_3:

            return RELEASE_3;

        case JDK1_4:

            return RELEASE_4;

        case JDK1_5:

            return RELEASE_5;

        case JDK1_6:

            return RELEASE_6;

        case JDK1_7:

            return RELEASE_7;

        case JDK1_8:

            return RELEASE_8;

        default:

            return null;

        }

    }

}