/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.quicksetup.upgrader;
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import org.opends.quicksetup.i18n.ResourceProvider;
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import org.opends.quicksetup.BuildInformation;
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/**
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* This class can answer questions important upgrade/reversion questions
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* like 'can I upgrade from verion X to version Y?' and 'if not then why?'.
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*/
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public class UpgradeOracle {
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private BuildInformation currentBuildInfo;
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private BuildInformation newBuildInfo;
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/**
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* Creates a new instance that can analyze a hypothetical upgrade/reversion
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* operation from one version to another.
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* @param current BuildInformation representing the current version
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* @param neu BuildInformation representing the proposed next version
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*/
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public UpgradeOracle(BuildInformation current, BuildInformation neu) {
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this.currentBuildInfo = current;
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this.newBuildInfo = neu;
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}
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/**
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* Indicates whether or not this operation would be considered an
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* upgrade (as opposed to a reversion).
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* @return boolean where true indicates that this would be an upgrade;
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* false indicates that this would be a reversion.
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*/
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public boolean isUpgrade() {
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return currentBuildInfo.compareTo(newBuildInfo) < 0;
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}
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/**
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* Indicates whether or not this operation would be considered an
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* reversion (as opposed to an upgrade).
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* @return boolean where true indicates that this would be a reversion;
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* false indicates that this would be an upgrade.
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*/
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public boolean isReversion() {
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return currentBuildInfo.compareTo(newBuildInfo) < 0;
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}
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/**
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* Indicates whether or not this hypothetical operation should be allowed
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* to happen.
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* @return boolean where true indicates that we are confident that such
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* an operation will succeed
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*/
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public boolean isSupported() {
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return !isReversion();
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}
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/**
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* Creates a string summarizing a hypothetical upgrade/reversion
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* from <code>currentVersion</code> to <code>newVersion</code> giving
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* reasons why such an attempt would not be successful.
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* @return String representing a localized message giving a summary of
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* this hypothetical operation.
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*/
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public String getSummaryMessage() {
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String msg;
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String[] args = { currentBuildInfo.toString(),
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currentBuildInfo.toString() };
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ResourceProvider rp = ResourceProvider.getInstance();
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if (isSupported()) {
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if (isUpgrade()) {
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msg = rp.getMsg("upgrade-hypothetical-upgrade-success", args);
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} else if (isReversion()) {
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msg = rp.getMsg("upgrade-hypothetical-reversion-success", args);
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} else {
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msg = rp.getMsg("upgrade-hypothetical-versions-the-same", args);
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}
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} else {
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if (isUpgrade()) {
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msg = rp.getMsg("upgrade-hypothetical-upgrade-failure", args);
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} else if (isReversion()) {
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msg = rp.getMsg("upgrade-hypothetical-reversion-failure", args);
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} else {
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msg = rp.getMsg("upgrade-hypothetical-versions-the-same", args);
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}
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}
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return msg;
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}
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}
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