93 lines
2.7 KiB
Java
93 lines
2.7 KiB
Java
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/*
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* This file is part of Applied Energistics 2.
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* Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
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*
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* Applied Energistics 2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Applied Energistics 2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
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*/
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package appeng.services.export;
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import java.util.List;
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import javax.annotation.Nonnull;
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import com.google.common.base.Preconditions;
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import org.apache.commons.codec.digest.DigestUtils;
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import cpw.mods.fml.common.ModContainer;
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/**
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* Checks the cached digest against the current mods including their versions.
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* Use the config to manipulate the process
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*
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* @author thatsIch
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* @version rv3 - 01.09.2015
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* @since rv3 - 01.09.2015
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*/
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final class ModListChecker implements Checker<List<ModContainer>>
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{
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private final String configHashValue;
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@Nonnull
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private final ExportConfig config;
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/**
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* @param config uses the config to retrieve the old hash of the mod list
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*/
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ModListChecker( @Nonnull final ExportConfig config )
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{
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this.config = Preconditions.checkNotNull( config );
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this.configHashValue = Preconditions.checkNotNull( config.getCache() );
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}
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/**
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* Compiles a list of all mods and their versions to a digest which is updated, if it differs from the config. This is used to elevate the need to export
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* the csv once again, if no change was detected.
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*
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* @param modContainers all mods and their versions to check if a difference exists between the current instance and the previous instance
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*
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* @return CheckType.EQUAL if no change was detected
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*/
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@Nonnull
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@Override
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public CheckType isEqual( @Nonnull final List<ModContainer> modContainers )
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{
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Preconditions.checkNotNull( modContainers );
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final StringBuilder builder = new StringBuilder();
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for( final ModContainer container : modContainers )
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{
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builder.append( container.getModId() );
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builder.append( container.getVersion() );
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}
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final String allModsAndVersions = builder.toString();
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final String hex = DigestUtils.md5Hex( allModsAndVersions );
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if( hex.equals( this.configHashValue ) )
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{
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return CheckType.EQUAL;
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}
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else
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{
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this.config.setCache( hex );
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return CheckType.UNEQUAL;
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}
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}
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}
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