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/*
 * Fabric3
 * Copyright (c) 2009-2013 Metaform Systems
 *
 * Fabric3 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 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 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 Fabric3.
 * If not, see .
*/
package org.fabric3.wsdl.contribution.impl;

import java.io.IOException;
import java.net.URL;

import org.apache.ws.commons.schema.resolver.DefaultURIResolver;
import org.apache.ws.commons.schema.resolver.URIResolver;
import org.xml.sax.InputSource;

/**
 * Resolves a WSDL entity by first using the thread context classloader and if not found, a default URI resolver. The following resource locations
 * will be used with the thread context classloader: 
 * 
 * 
Root jar directory
 * 
 * 
wsdl directory
 * 
 * 
META-INF directory
 * 
 * 
META-INF/wsdl directory
 * 
 * 
 */
public class ContextClassLoaderResolver implements URIResolver {
    private URIResolver next;

    public ContextClassLoaderResolver(URIResolver next) {
        this.next = next;
    }

    public InputSource resolveEntity(String targetNamespace, String schemaLocation, String baseUri) {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        URL url = loader.getResource(schemaLocation);
        if (url != null) {
            return createSource(url);
        }
        url = loader.getResource("wsdl/" + schemaLocation);
        if (url != null) {
            return createSource(url);
        }
        url = loader.getResource("META-INF/" + schemaLocation);
        if (url != null) {
            return createSource(url);
        }
        url = loader.getResource("META-INF/wsdl/" + schemaLocation);
        if (url != null) {
            return createSource(url);
        }
        return next.resolveEntity(targetNamespace, schemaLocation, baseUri);
    }

    private InputSource createSource(URL url) {
        try {
            return new InputSource(url.openStream());
        } catch (IOException e) {
            throw new AssertionError(e);
        }
    }
}