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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.lang3;

import org.apache.commons.lang3.math.NumberUtils;

/**
 * An enum representing all the versions of the Java specification.
 * This is intended to mirror available values from the
 * java.specification.version System property.
 *
 * @since 3.0
 */
public enum JavaVersion {

    /**
     * The Java version reported by Android. This is not an official Java version number.
     */
    JAVA_0_9(1.5f, "0.9"),

    /**
     * Java 1.1.
     */
    JAVA_1_1(1.1f, "1.1"),

    /**
     * Java 1.2.
     */
    JAVA_1_2(1.2f, "1.2"),

    /**
     * Java 1.3.
     */
    JAVA_1_3(1.3f, "1.3"),

    /**
     * Java 1.4.
     */
    JAVA_1_4(1.4f, "1.4"),

    /**
     * Java 1.5.
     */
    JAVA_1_5(1.5f, "1.5"),

    /**
     * Java 1.6.
     */
    JAVA_1_6(1.6f, "1.6"),

    /**
     * Java 1.7.
     */
    JAVA_1_7(1.7f, "1.7"),

    /**
     * Java 1.8.
     */
    JAVA_1_8(1.8f, "1.8"),

    /**
     * Java 1.9.
     *
     * @deprecated As of release 3.5, replaced by {@link #JAVA_9}
     */
    @Deprecated
    JAVA_1_9(9.0f, "9"),

    /**
     * Java 9.
     *
     * @since 3.5
     */
    JAVA_9(9.0f, "9"),

    /**
     * Java 10.
     *
     * @since 3.7
     */
    JAVA_10(10.0f, "10"),

    /**
     * Java 11.
     *
     * @since 3.8
     */
    JAVA_11(11.0f, "11"),

    /**
     * Java 12.
     *
     * @since 3.9
     */
    JAVA_12(12.0f, "12"),

    /**
     * Java 13.
     *
     * @since 3.9
     */
    JAVA_13(13.0f, "13"),

    /**
     * Java 14.
     *
     * @since 3.11
     */
    JAVA_14(14.0f, "14"),

    /**
     * Java 15.
     *
     * @since 3.11
     */
    JAVA_15(15.0f, "15"),

    /**
     * Java 16.
     *
     * @since 3.11
     */
    JAVA_16(16.0f, "16"),

    /**
     * Java 17.
     *
     * @since 3.12.0
     */
    JAVA_17(17.0f, "17"),

    /**
     * Java 18.
     *
     * @since 3.13.0
     */
    JAVA_18(18.0f, "18"),

    /**
     * Java 19.
     *
     * @since 3.13.0
     */
    JAVA_19(19.0f, "19"),

    /**
     * Java 20.
     *
     * @since 3.13.0
     */
    JAVA_20(20, "20"),

    /**
     * Java 21.
     *
     * @since 3.13.0
     */
    JAVA_21(21, "21"),

    /**
     * The most recent java version. Mainly introduced to avoid to break when a new version of Java is used.
     */
    JAVA_RECENT(maxVersion(), Float.toString(maxVersion()));

    /**
     * The float value.
     */
    private final float value;

    /**
     * The standard name.
     */
    private final String name;

    /**
     * Constructor.
     *
     * @param value  the float value
     * @param name  the standard name, not null
     */
    JavaVersion(final float value, final String name) {
        this.value = value;
        this.name = name;
    }

    /**
     * Whether this version of Java is at least the version of Java passed in.
     *
     * 

For example:
* {@code myVersion.atLeast(JavaVersion.JAVA_1_4)}

* * @param requiredVersion the version to check against, not null * @return true if this version is equal to or greater than the specified version */ public boolean atLeast(final JavaVersion requiredVersion) { return this.value >= requiredVersion.value; } /** * Whether this version of Java is at most the version of Java passed in. * *

For example:
* {@code myVersion.atMost(JavaVersion.JAVA_1_4)}

* * @param requiredVersion the version to check against, not null * @return true if this version is equal to or greater than the specified version * @since 3.9 */ public boolean atMost(final JavaVersion requiredVersion) { return this.value <= requiredVersion.value; } /** * Transforms the given string with a Java version number to the * corresponding constant of this enumeration class. This method is used * internally. * * @param versionStr the Java version as string * @return the corresponding enumeration constant or null if the * version is unknown */ // helper for static importing static JavaVersion getJavaVersion(final String versionStr) { return get(versionStr); } /** * Transforms the given string with a Java version number to the * corresponding constant of this enumeration class. This method is used * internally. * * @param versionStr the Java version as string * @return the corresponding enumeration constant or null if the * version is unknown */ static JavaVersion get(final String versionStr) { if (versionStr == null) { return null; } switch (versionStr) { case "0.9": return JAVA_0_9; case "1.1": return JAVA_1_1; case "1.2": return JAVA_1_2; case "1.3": return JAVA_1_3; case "1.4": return JAVA_1_4; case "1.5": return JAVA_1_5; case "1.6": return JAVA_1_6; case "1.7": return JAVA_1_7; case "1.8": return JAVA_1_8; case "9": return JAVA_9; case "10": return JAVA_10; case "11": return JAVA_11; case "12": return JAVA_12; case "13": return JAVA_13; case "14": return JAVA_14; case "15": return JAVA_15; case "16": return JAVA_16; case "17": return JAVA_17; case "18": return JAVA_18; case "19": return JAVA_19; case "20": return JAVA_20; case "21": return JAVA_21; default: final float v = toFloatVersion(versionStr); if ((v - 1.) < 1.) { // then we need to check decimals > .9 final int firstComma = Math.max(versionStr.indexOf('.'), versionStr.indexOf(',')); final int end = Math.max(versionStr.length(), versionStr.indexOf(',', firstComma)); if (Float.parseFloat(versionStr.substring(firstComma + 1, end)) > .9f) { return JAVA_RECENT; } } else if (v > 10) { return JAVA_RECENT; } return null; } } /** * The string value is overridden to return the standard name. * *

For example, {@code "1.5"}.

* * @return the name, not null */ @Override public String toString() { return name; } /** * Gets the Java Version from the system or 99.0 if the {@code java.specification.version} system property is not set. * * @return the value of {@code java.specification.version} system property or 99.0 if it is not set. */ private static float maxVersion() { final float v = toFloatVersion(System.getProperty("java.specification.version", "99.0")); return v > 0 ? v : 99f; } /** * Parses a float value from a String. * * @param value the String to parse. * @return the float value represented by the string or -1 if the given String can not be parsed. */ private static float toFloatVersion(final String value) { final int defaultReturnValue = -1; if (!value.contains(".")) { return NumberUtils.toFloat(value, defaultReturnValue); } final String[] toParse = value.split("\\."); if (toParse.length >= 2) { return NumberUtils.toFloat(toParse[0] + '.' + toParse[1], defaultReturnValue); } return defaultReturnValue; } }




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