catalogexception.java

由国外的一个著名的geonetwork修改而来

//=============================================================================
//===	Copyright (C) 2001-2005 Food and Agriculture Organization of the
//===	United Nations (FAO-UN), United Nations World Food Programme (WFP)
//===	and United Nations Environment Programme (UNEP)
//===
//===	This program 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 2 of the License, or (at
//===	your option) any later version.
//===
//===	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
//===	General Public License for more details.
//===
//===	You should have received a copy of the GNU General Public License
//===	along with this program; if not, write to the Free Software
//===	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//===
//===	Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
//===	Rome - Italy. email: [e-mail]
//==============================================================================

package org.fao.geonet.csw.common.exceptions;

import java.util.List;
import jeeves.utils.Xml;
import org.fao.geonet.csw.common.Csw;
import org.jdom.Element;
import org.jdom.Namespace;

//=============================================================================

public abstract class CatalogException extends Exception
{
	protected static final String INVALID_PARAMETER_VALUE    = "InvalidParameterValue";
	protected static final String INVALID_UPDATE_SEQUENCE    = "InvalidUpdateSequence";
	protected static final String MISSING_PARAMETER_VALUE    = "MissingParameterValue";
	protected static final String NO_APPLICABLE_CODE         = "NoApplicableCode";
	protected static final String OPERATION_NOT_SUPPORTED    = "OperationNotSupported";
	protected static final String VERSION_NEGOTIATION_FAILED = "VersionNegotiationFailed";

	//---------------------------------------------------------------------------

	private String code;
	private String locator;

	//---------------------------------------------------------------------------
	//---
	//--- Constructor
	//---
	//---------------------------------------------------------------------------

	public CatalogException(String code, String message, String locator)
	{
		super(message);

		this.code    = code;
		this.locator = locator;
	}

	//---------------------------------------------------------------------------

	public CatalogException(String code, String message, String locator, CatalogException cause)
	{
		super(message, cause);

		this.code    = code;
		this.locator = locator;
	}

	//---------------------------------------------------------------------------
	//---
	//--- API methods
	//---
	//---------------------------------------------------------------------------

	public String getCode()    { return code;    }
	public String getLocator() { return locator; }

	//---------------------------------------------------------------------------

	public String toString()
	{
		String clazz = getClass().getName();
		return clazz +": code="+code+", locator="+locator+", message="+getMessage();
	}

	//---------------------------------------------------------------------------

	public static Element marshal(CatalogException e)
	{
		//--- setup root node

		Element root = new Element("ExceptionReport", Csw.NAMESPACE_OWS);
		root.setAttribute("version", Csw.OWS_VERSION);

		while (e != null)
		{
			Element exc = new Element("Exception", Csw.NAMESPACE_OWS);
			exc.setAttribute("exceptionCode", e.getCode());

			if (e.getMessage() != null)
				exc.addContent(new Element("ExceptionText", Csw.NAMESPACE_OWS).setText(e.getMessage()));

			if (e.getLocator() != null)
				exc.setAttribute("locator", e.getLocator());

			root.addContent(exc);

			e = (CatalogException) e.getCause();
		}

		return root;
	}

	//---------------------------------------------------------------------------

	public static void unmarshal(Element response) throws CatalogException, Exception
	{
		if (!response.getName().equals("ExceptionReport"))
			return;

		Namespace ns = response.getNamespace();

		List exceptions = response.getChildren("Exception", ns);

		if (exceptions.size() == 0)
			throw new Exception("Bad exception (no 'Exception' elem) : \n"+
										Xml.getString(response));

		CatalogException e = null;

		for(int i=exceptions.size() -1; i>=0; i--)
		{
			Element ex = (Element) exceptions.get(i);

			e = createException(ex, response, e);
		}

		throw e;
	}

	//---------------------------------------------------------------------------

	private static CatalogException createException(Element ex, Element response,
																	CatalogException prev) throws Exception
	{
		Namespace ns = response.getNamespace();

		String code = ex.getAttributeValue("exceptionCode");

		if (code == null)
			throw new Exception("Bad exception (no 'exceptionCode' attr) : \n"+
										Xml.getString(response));

		Element text = ex.getChild("ExceptionText", ns);

		String locator = ex.getAttributeValue("locator");
		String message = (text == null) ? null : text.getText();

		CatalogException e = null;

		if (code.equals(INVALID_PARAMETER_VALUE))
			e = new InvalidParameterValueEx(null, message, prev);

		if (code.equals(INVALID_UPDATE_SEQUENCE))
			e = new InvalidUpdateSequenceEx(message, prev);

		if (code.equals(MISSING_PARAMETER_VALUE))
			e = new MissingParameterValueEx(null, prev);

		if (code.equals(NO_APPLICABLE_CODE))
			e = new NoApplicableCodeEx(message, prev);

		if (code.equals(OPERATION_NOT_SUPPORTED))
			e = new OperationNotSupportedEx(null, prev);

		if (code.equals(VERSION_NEGOTIATION_FAILED))
			e = new VersionNegotiationFailedEx(message, prev);

		if (e == null)
			throw new Exception("Bad exception (unknown 'exceptionCode') : \n"+
										Xml.getString(response));

		e.locator = locator;

		return e;
	}
}

//=============================================================================