/*
 *  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
 *
 *    https://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.grails.gsp;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.core.io.Resource;
import org.springframework.util.Assert;

import org.grails.core.io.StaticResourceLoader;

/**
 * A StaticResourceLoader that loads GSPs from a local grails-app folder instead of from WEB-INF in
 * development mode.
 *
 * @see org.grails.core.io.StaticResourceLoader
 *
 * @author Graeme Rocher
 * @since 0.5
 */
public class GroovyPageResourceLoader extends StaticResourceLoader {

    /**
     * The id of the instance of this bean to be used in the Spring context
     */
    public static final String BEAN_ID = "groovyPageResourceLoader";

    private static final Log LOG = LogFactory.getLog(GroovyPageResourceLoader.class);
    private static final String PLUGINS_PATH = "/plugins/";

    private Resource localBaseResource;

    @Override
    public void setBaseResource(Resource baseResource) {
        localBaseResource = baseResource;
        super.setBaseResource(baseResource);
    }

    @Override
    public Resource getResource(String location) {
        Assert.hasLength(location, "Argument [location] cannot be null or blank");

        Resource resource = super.getResource(location);

        if (LOG.isDebugEnabled()) {
            LOG.debug("Resolved GSP location [" + location + "] to resource [" + resource +
                    "] (exists? [" + resource.exists() + "]) using base resource [" + localBaseResource + "]");
        }
        return resource;
    }
}
