com.github.mrstampy.gameboot.util.resource.AbstractFallbackResourceCondition.java Source code

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Here is the source code for com.github.mrstampy.gameboot.util.resource.AbstractFallbackResourceCondition.java

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/*
 *              ______                        ____              __ 
 *             / ____/___ _____ ___  ___     / __ )____  ____  / /_
 *            / / __/ __ `/ __ `__ \/ _ \   / __  / __ \/ __ \/ __/
 *           / /_/ / /_/ / / / / / /  __/  / /_/ / /_/ / /_/ / /_  
 *           \____/\__,_/_/ /_/ /_/\___/  /_____/\____/\____/\__/  
 *                                                 
 *                                 .-'\
 *                              .-'  `/\
 *                           .-'      `/\
 *                           \         `/\
 *                            \         `/\
 *                             \    _-   `/\       _.--.
 *                              \    _-   `/`-..--\     )
 *                               \    _-   `,','  /    ,')
 *                                `-_   -   ` -- ~   ,','
 *                                 `-              ,','
 *                                  \,--.    ____==-~
 *                                   \   \_-~\
 *                                    `_-~_.-'
 *                                     \-~
 * 
 *                       http://mrstampy.github.io/gameboot/
 *
 * Copyright (C) 2015, 2016 Burton Alexander
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * 
 */
package com.github.mrstampy.gameboot.util.resource;

import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotatedTypeMetadata;

/**
 * The Class AbstractFallbackResourceCondition allows a {@link Condition} to be
 * written where a fallback {@link Resource} can be overridden by any of the
 * supplied overrides should they exist.
 */
public abstract class AbstractFallbackResourceCondition implements Condition {

    /** The Constant EXT_CLASSPATH. */
    public static final String EXT_CLASSPATH = "gameboot/";

    private String fallback;
    private String[] overrides;

    /**
     * Instantiates a new abstract fallback resource condition with a fallback
     * {@link Resource} and overrides.
     *
     * @param fallBack
     *          the fall back
     * @param overrides
     *          the overrides
     */
    protected AbstractFallbackResourceCondition(String fallBack, String... overrides) {
        this.fallback = fallBack;
        this.overrides = overrides;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.context.annotation.Condition#matches(org.
     * springframework.context.annotation.ConditionContext,
     * org.springframework.core.type.AnnotatedTypeMetadata)
     */
    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        ResourceLoader loader = context.getResourceLoader();

        if (hasOverride(loader))
            return false;

        boolean b = loader.getResource(fallback).exists();

        if (b)
            ResourceLogger.log(fallback);

        return b;
    }

    private boolean hasOverride(ResourceLoader loader) {
        if (overrides == null || overrides.length == 0)
            return false;

        for (String override : overrides) {
            Resource o = loader.getResource(override);
            if (o.exists()) {
                ResourceLogger.log(override, fallback);
                return true;
            }
        }

        return false;
    }

}