URILocationImpl.java

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 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * Copyright 2002 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.exolab.castor.net.util;

import org.exolab.castor.net.URILocation;
import java.io.*;

/**
 * An implementation of URILocation
 *
 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date: 2005-03-05 06:42:06 -0700 (Sat, 05 Mar 2005) $
**/
public final class URILocationImpl extends URILocation {

    private String _documentBase = null;
    private String _absoluteURI  = null;
    private String _relativeURI  = null;


    private Reader      _reader = null;
    private InputStream _is     = null;


    /**
     * Creates a new URILocationImpl
    **/
    public URILocationImpl(String href) {
        this(href, null);
    } //-- URILocationImpl

    /**
     * Creates a new URILocationImpl
    **/
    public URILocationImpl(String href, String documentBase) {
        if (href == null)
            throw new IllegalStateException("href must not be null");
        _absoluteURI = URIUtils.resolveAsString(href, documentBase);
    } //-- URILocationImpl


    /**
     * Creates a new URILocationImpl
    **/
    public URILocationImpl(Reader reader, String href) {
        this(href, null);
        _reader = reader;
    } //-- URILocationImpl

    /**
     * Creates a new URILocationImpl
    **/
    public URILocationImpl(InputStream is, String href) {
        this(href, null);
        _is = is;
    } //-- URILocationImpl



	/**
	 * Returns the absolute URI for this URILocation
	 *
	 * @return the absolute URI for this URILocation
	 * @see #getRelativeURI
	 * @see #getBaseURI
	**/
	public String getAbsoluteURI() {
	    return _absoluteURI;
	} //-- getAbsoluteURI

	/**
	 * Returns the base location of this URILocation.
	 * If this URILocation is an URL, the base location
	 * will be equivalent to the document base for the URL.
	 *
	 * @return the base location of this URILocation
	 * @see #getAbsoluteURI
	 * @see #getRelativeURI
	**/
	public String getBaseURI() {
	    if (_documentBase == null)
	        _documentBase = URIUtils.getDocumentBase(_absoluteURI);
	    return _documentBase;
	} //-- getBaseURI

	/**
	 * Returns a Reader for the resource represented
	 * by this URILocation.
	 *
	 * @return a Reader for the resource represented by
	 * this URILocation
	 * @exception java.io.FileNotFoundException
	 * @exception java.io.IOException
	**/
	public Reader getReader() throws java.io.IOException {

	    if (_reader != null)
	        return _reader;
	    if (_is != null)
	        return new InputStreamReader(_is);

	    return URIUtils.getReader(_absoluteURI, null);
	} //-- getReader

	/**
	 * Returns the relative URI for this URILocation
	 *
	 * @return the relative URI for this URILocation
	 * @see #getAbsoluteURI
	 * @see #getBaseURI
	**/
	public String getRelativeURI() {

	    if (_relativeURI == null) {
	        int idx = getBaseURI().length();
	        _relativeURI = _absoluteURI.substring(idx);
	    }

	    return _relativeURI;

	} //-- getRelativeURI

	/**
	 * Returns the String representation of
	 * this URILocation.
	 *
	 * @return the String representation of this URILocation
	**/
	public String toString() {
	    return getAbsoluteURI();
	}

} //-- URILocationImpl