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/*
* Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation
//
package org.eclipse.persistence.jpa.jpql;
/**
* An enumeration listing the various releases of the Java Persistence specification.
*
* Provisional API: This interface is part of an interim API that is still under development and
* expected to change significantly before reaching stability. It is available at this early stage
* to solicit feedback from pioneering adopters on the understanding that any code that uses this
* API will almost certainly be broken (repeatedly) as the API evolves.
*
* @version 2.5
* @since 2.3
* @author Pascal Filion
*/
public enum JPAVersion {
/**
* The constant for the default version used by the parsing system, which is always the latest
* version of the Java Persistence functional specification, which is version 2.0.
*/
DEFAULT_VERSION(2.1),
/**
* The constant for the Java Persistence specification 1.0.
*/
VERSION_1_0(1.0),
/**
* The constant for the Java Persistence specification 2.0.
*/
VERSION_2_0(2.0),
/**
* The constant for the Java Persistence specification 2.1.
*/
VERSION_2_1(2.1);
/**
* The real version number.
*/
private double version;
/**
* Creates a new JPAVersion.
*
* @param version The actual version number
*/
private JPAVersion(double version) {
this.version = version;
}
/**
* Retrieves the enumeration constant for the given value. If the value is not known, then
* {@link #DEFAULT_VERSION} will be returned.
*
* @param value The value to retrieve its constant version
* @return The constant version of the given value
*/
public static JPAVersion value(String value) {
for (JPAVersion version : versions()) {
if (version.getVersion().equals(value)) {
return version;
}
}
return DEFAULT_VERSION;
}
/**
* Returns the list of {@link JPAVersion} excluding {@link #DEFAULT_VERSION}.
*
* @return The list of unique constants
*/
public static JPAVersion[] versions() {
JPAVersion[] values = new JPAVersion[3];
values[0] = VERSION_1_0;
values[1] = VERSION_2_0;
values[2] = VERSION_2_1;
return values;
}
/**
* Returns the real version this constant represents.
*
* @return The string value of the version
*/
public String getVersion() {
return String.valueOf(version);
}
/**
* Determines whether this constant represents a version that is newer than the given version.
*
* @param version The constant to verify if it's representing a version that is older than this one
* @return true if this constant represents a newer version and the given constant
* represents a version that is older; false if the given constant represents a
* newer and this constant represents an older version
*/
public boolean isNewerThan(JPAVersion version) {
return this.version > version.version;
}
/**
* Determines whether this constant represents a version that is newer than the given version or
* if it's the same version.
*
* @param version The constant to verify if it's representing a version that is older than this
* one or if it's the same than this one
* @return true if this constant represents a newer version and the given constant
* represents a version that is older or if it's the same constant; false if the
* given constant represents a newer and this constant represents an older version
*/
public boolean isNewerThanOrEqual(JPAVersion version) {
return this.version >= version.version;
}
/**
* Determines whether this constant represents a version that is older than the given version.
*
* @param version The constant to verify if it's representing a version that is more recent than
* this one
* @return true if this constant represents an earlier version and the given
* constant represents a version that is more recent; false if the given constant
* represents an earlier version and this constant represents a more recent version
*/
public boolean isOlderThan(JPAVersion version) {
return this.version < version.version;
}
/**
* Determines whether this constant represents a version that is older than the given version or
* if it's the same version.
*
* @param version The constant to verify if it's representing a version that is more recent than
* this one or if it's the same than this one
* @return true if this constant represents an earlier version and the given
* constant represents a version that is more recent or if it's the same constant; false
* if the given constant represents an earlier version and this constant represents a more recent
* version
*/
public boolean isOlderThanOrEqual(JPAVersion version) {
return this.version <= version.version;
}
/**
* Converts the current constant to one of the known versions, this means if the constant is
* {@link #DEFAULT_VERSION}, then it will be converted into the actual constant representing that
* version.
*
* @return Either this same constant or the actual version constant
*/
public JPAVersion toCurrentVersion() {
if (this == DEFAULT_VERSION) {
String currentVersion = getVersion();
for (JPAVersion version : versions()) {
if (currentVersion.equals(String.valueOf(version.version))) {
return version;
}
}
}
return this;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return getVersion();
}
}