org.apache.commons.lang3.JavaVersion Maven / Gradle / Ivy
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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;
/**
* 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
* @version $Id: $
*/
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(1.1f, "1.1"),
JAVA_1_2(1.2f, "1.2"),
JAVA_1_3(1.3f, "1.3"),
JAVA_1_4(1.4f, "1.4"),
JAVA_1_5(1.5f, "1.5"),
JAVA_1_6(1.6f, "1.6"),
JAVA_1_7(1.7f, "1.7"),
JAVA_1_8(1.8f, "1.8");
/**
* The float value.
*/
private float value;
/**
* The standard name.
*/
private 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(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 nom 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 nom) {
return get(nom);
}
/**
* Transforms the given string with a Java version number to the
* corresponding constant of this enumeration class. This method is used
* internally.
*
* @param nom the Java version as string
* @return the corresponding enumeration constant or null if the
* version is unknown
*/
static JavaVersion get(final String nom) {
if ("0.9".equals(nom)) {
return JAVA_0_9;
} else if ("1.1".equals(nom)) {
return JAVA_1_1;
} else if ("1.2".equals(nom)) {
return JAVA_1_2;
} else if ("1.3".equals(nom)) {
return JAVA_1_3;
} else if ("1.4".equals(nom)) {
return JAVA_1_4;
} else if ("1.5".equals(nom)) {
return JAVA_1_5;
} else if ("1.6".equals(nom)) {
return JAVA_1_6;
} else if ("1.7".equals(nom)) {
return JAVA_1_7;
} else if ("1.8".equals(nom)) {
return JAVA_1_8;
} else {
return null;
}
}
//-----------------------------------------------------------------------
/**
*
The string value is overridden to return the standard name.
*
* For example, "1.5".
*
* @return the name, not null
*/
@Override
public String toString() {
return name;
}
}