/*
 * Created on 27.7.2004
 */
package net.sf.tomp.xml.resolver;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.resolver.CatalogManager;
import org.apache.xml.resolver.tools.CatalogResolver;

/**
 * @author tomp
 */
public class JavaResolver extends CatalogResolver {

    private Log log = LogFactory.getLog(JavaResolver.class);

    protected static final String JAVA_PREFIX = "java:";

    /**
     *  
     */
    public JavaResolver() {
        super();

        // TODO Auto-generated constructor stub
    }

    /**
     * @param privateCatalog
     */
    public JavaResolver(boolean privateCatalog) {
        super(privateCatalog);

        // TODO Auto-generated constructor stub
    }

    /**
     * @param manager
     */
    public JavaResolver(CatalogManager manager) {
        super(manager);

        // TODO Auto-generated constructor stub
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.xml.resolver.tools.CatalogResolver#getResolvedEntity(java.lang.String,
     *      java.lang.String)
     */
    public String getResolvedEntity(String publicId, String systemId) {
        // TODO Auto-generated method stub
        return super.getResolvedEntity(publicId, systemId);
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.xml.transform.URIResolver#resolve(java.lang.String,
     *      java.lang.String)
     */
    public Source resolve(String href, String base) throws TransformerException {
        if (isJavaURI(href, base)) {
            String ref = href;
            String fragment = null;
            int hashPos = href.indexOf("#");

            if (hashPos >= 0) {
                ref = href.substring(0, hashPos);
                fragment = href.substring(hashPos + 1);
            }

            ref = ref.substring(JAVA_PREFIX.length());

            // FIXME base ignored; this is not OK!
            return new StreamSource(JavaResolver.class.getClassLoader()
                    .getResourceAsStream(ref));
        } else {
            Source src = super.resolve(href, base); 
            log.debug("CatalogResolver resolved href="+href+" base="+base+" to systemId="+src.getSystemId());
//            System.out.println("catalog="+this.getCatalog());
//            System.out.println("catalog.currbase="+this.getCatalog().getCurrentBase());
            return src;
        }
    }

    private boolean isJavaURI(String href, String base) {
        return base.startsWith(JAVA_PREFIX) || href.startsWith(JAVA_PREFIX);
    }
}