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Contains the entire NEBA core implementation, i.e. the framework that interprets the NEBA API annotations and provides implementations for the service and lifecycle callback interfaces provided in the NEBA API. This package must not export anything as its implementation details are entirely private.

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/**
 * Copyright 2013 the original author or authors.
 * 
 * Licensed 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
 * 
 * http://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 io.neba.core.rendering;

import io.neba.core.sling.AdministrativeResourceResolver;
import org.apache.commons.collections.ExtendedProperties;
import org.apache.sling.api.resource.Resource;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.resource.loader.ResourceLoader;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.InputStream;

/**
 * Loads velocity resources from a JCR repository.
 * 
 * @author Olaf Otto
 */
@Service
public class JcrResourceLoader extends ResourceLoader {
    @Autowired
    private AdministrativeResourceResolver resourceResolver;

    @Override
    public void init(ExtendedProperties configuration) {
    }

    @Override
    public InputStream getResourceStream(String source) throws ResourceNotFoundException {
        InputStream in = null;
        Resource resource = getResource(source);
        if (resource != null) {
            in = resource.adaptTo(InputStream.class);
        }
        return in;
    }

    @Override
    public boolean isSourceModified(org.apache.velocity.runtime.resource.Resource velocityResource) {
        Resource resource = getResource(velocityResource.getName());
        boolean resourceWasRemoved = resource == null;
        boolean resourceWasModified = !resourceWasRemoved && 
                resource.getResourceMetadata().getModificationTime() > velocityResource.getLastModified();
        return resourceWasRemoved || resourceWasModified;
    }

    @Override
    public long getLastModified(org.apache.velocity.runtime.resource.Resource velocityResource) {
        Resource resource = getResource(velocityResource.getName());
        return resource == null ? -1 : resource.getResourceMetadata().getModificationTime();
    }

    private Resource getResource(String source) {
        return this.resourceResolver.get(source);
    }
}