CatalogComponentResolver.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * 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
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package ddf.camel.component.catalog;

import java.io.InputStream;

import org.apache.camel.CamelContext;
import org.apache.camel.Component;
import org.apache.camel.spi.ComponentResolver;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ddf.camel.component.catalog.converter.BinaryContentStringTypeConverter;
import ddf.catalog.data.BinaryContent;

/**
 * Custom Camel component resolver used to resolve the custom DDF <code>catalog</code> scheme in
 * Camel route nodes, i.e., route nodes with URIs like <code>
 *     uri="catalog:inputtransformer?id=text/xml;id=identity"
 *     </code>
 *
 * @author Hugh Rodgers, Lockheed Martin
 * @author William Miller, Lockheed Martin
 * @author ddf.isgs@lmco.com
 *
 */
public class CatalogComponentResolver implements ComponentResolver {
    private static final transient Logger LOGGER =
            LoggerFactory.getLogger(CatalogComponentResolver.class);

    private final Component component;

    /**
     * Constructs component resolver for specified Camel component.
     *
     * @param component
     *            the Camel component associated with this component resolver
     */
    public CatalogComponentResolver(Component component) {
        LOGGER.debug("INSIDE: constructor");
        this.component = component;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.camel.spi.ComponentResolver#resolveComponent(java.lang.String,
     * org.apache.camel.CamelContext)
     */
    public Component resolveComponent(String name, CamelContext context) {
        LOGGER.debug("INSIDE: resolveComponent");

        if (null != context) {
            BinaryContentStringTypeConverter converter = new BinaryContentStringTypeConverter();
            context.getTypeConverterRegistry()
                    .addTypeConverter(BinaryContent.class, String.class, converter);
            context.getTypeConverterRegistry()
                    .addTypeConverter(BinaryContent.class, InputStream.class, converter);
        }
        if (CatalogComponent.NAME.equals(name)) {
            return component;
        }
        return null;
    }
}