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/**
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* '$RCSfile$'
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* Purpose: A class to asyncronously do delta-T replication checking
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Chad Berkley
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* Release: @release@
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*
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* '$Author: sgarg $'
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* '$Date: 2005-03-04 11:51:55 -0800 (Fri, 04 Mar 2005) $'
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* '$Revision: 2399 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.StringReader;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.Hashtable;
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import java.util.Vector;
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import org.apache.xpath.objects.XObject;
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import org.apache.xpath.XPathAPI;
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import org.apache.xerces.parsers.DOMParser;
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import org.apache.xerces.dom.DocumentTypeImpl;
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import org.w3c.dom.Attr;
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import org.w3c.dom.NamedNodeMap;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.Document;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.w3c.dom.DocumentType;
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import org.xml.sax.InputSource;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.transform.*;
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import javax.xml.transform.stream.*;
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import javax.xml.transform.dom.*;
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import org.ecoinformatics.eml.EMLParser;
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/**
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* This class will figure out which content type it is for a given data file.
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* First, from xml_relation to get all relative files to this data file.
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* Then from xml_documents to get physical files. From physical file pull out
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* the content type
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*/
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public class ContentTypeProvider
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{
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private String dataFileId = null;
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private String contentType = null;
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private String packageType = null;
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private Hashtable contentTypeHash = new Hashtable();
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//Constant
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private String BETA = "beta";
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private String EML2 = "eml2";
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private String DEFAULTCONTENTTYPE = MetaCatUtil.
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getOption("defaultcontenttype");
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private String FORMATPATH = "//format";
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private String TEXT = "text";
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private String TEXTYPE ="text/plain";
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private String XML = "xml";
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private String XMLTYPE = "text/xml";
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private String HTML = "HTML";
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private String HTMLTYPE = "text/html";
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private String GIF = "gif";
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private String JPEG = "jpeg";
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private String JPEGTYPE = "image/jpeg";
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private String GIFTYPE = "image/gif";
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private String BMP = "bmp";
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private String BMPTYPE = "image/bmp";
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private String TAR = "tar";
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private String TARTYPE ="application/x-tar";
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private String ZIP = "zip";
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private String ZIPTYPE = "application/x-zip-compressed";
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private String BINARY = "binary";
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private String BINARYTYPE = "application/octet-stream";
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private String ENTITYDOCTYPE = "entitydoctype";
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private String PHYSICALDOCTYPE = "physicaldoctype";
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private String EML2DOCTYPE = "eml2namespace";
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private String DATAFORMAT = "dataFormat";
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private String TEXTFORMAT = "textFormat";
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private String EXTENALFORMAT = "externallyDefinedFormat";
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private String FORMATNAME = "formatName";
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private String BINARYRASTERFORMAT = "binaryRasterFormat";
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private String DATAFILEPATH ="//physical/distribution/online/url";
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/**
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* Constructor of ContentTypeProvider
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*/
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public ContentTypeProvider(String docIdWithRevision)
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{
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dataFileId = MetaCatUtil.getDocIdFromString(docIdWithRevision);
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//get relative doclist for data file and package type
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Vector docLists = null;
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docLists = getRelativeDocIdList(dataFileId);
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if ( packageType == null)
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{
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// other situation, contenetype is default value
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contentType = DEFAULTCONTENTTYPE;
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}
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else if (packageType.equals(BETA))
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{
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// for beta package and get entity docid for the data file
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String entityDocid = getTargetDocIdForBeta(docLists, ENTITYDOCTYPE);
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// get physical docid for data file
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docLists = getRelativeDocIdList(entityDocid);
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String physicalDocId = getTargetDocIdForBeta(docLists, PHYSICALDOCTYPE);
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// if no physical docid assign to this data file, content type is default
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if (physicalDocId == null)
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{
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contentType = DEFAULTCONTENTTYPE;
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}
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else
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{
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parsePhysicalDocumentForBeta(physicalDocId);
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}
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}
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else if (packageType.equals(EML2))
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{
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// for eml2 package
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// get eml document for data file
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//String eml2Docid = getTargetDocIdForBeta(docLists, EML2DOCTYPE);
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String eml2Docid = (String)docLists.elementAt(0);
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findContentTypeInEML2(eml2Docid);
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}
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}
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/** Method to get content type */
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public String getContentType()
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{
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return contentType;
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}//getContentType
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/* Method to find content type base on data format*/
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private void findContentTypeInEML2(String eml2DocId)
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{
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if (eml2DocId == null)
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{
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contentType = DEFAULTCONTENTTYPE;
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return;
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}
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DocumentImpl xmlDoc = null;
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String xmlString = null;
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StringReader read = null;
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InputSource in = null;
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DocumentBuilderFactory dfactory = null;
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Document doc = null;
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// create xml document
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try
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{
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xmlDoc = new DocumentImpl(eml2DocId);
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xmlString = xmlDoc.toString();
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// create dom tree
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read = new StringReader(xmlString);
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in = new InputSource(read);
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dfactory = DocumentBuilderFactory.newInstance();
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dfactory.setNamespaceAware(false);
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doc = dfactory.newDocumentBuilder().parse(in);
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}
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catch (Exception e)
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{
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// if faild, set default value
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contentType = DEFAULTCONTENTTYPE;
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MetaCatUtil.debugMessage("Error in ContentTypeProvider." +
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"findContentTypeInEML2()" + e.getMessage(), 30);
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return;
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}
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Node dataFormatNode = findDataFormatNodeInEML2(doc, DATAFILEPATH,
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dataFileId);
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if (dataFormatNode == null)
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{
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contentType = DEFAULTCONTENTTYPE;
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MetaCatUtil.debugMessage("Couldn't find data format node", 30);
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return;
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}
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NodeList childList = dataFormatNode.getChildNodes();
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// go through childList
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for (int i = 0; i<childList.getLength(); i++)
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{
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Node child = childList.item(i);
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// if has text format child set to text/plain
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if (child.getNodeName() != null && child.getNodeName().equals(TEXTFORMAT))
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{
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MetaCatUtil.debugMessage("in text format", 35);
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contentType = TEXTYPE;
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}
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//external format
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if (child.getNodeName() != null && child.getNodeName().equals(EXTENALFORMAT))
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{
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MetaCatUtil.debugMessage("in external format ", 35);
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String format = getTextValueForGivenChildTag(child, FORMATNAME);
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MetaCatUtil.debugMessage("The format is: "+format, 35);
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// if we can find the format in the contentTypeHash table
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contentType = (String)lookUpContentType(format);
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if (contentType == null)
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{
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contentType = BINARYTYPE;
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}
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}
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// binaryRasterFormat
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if (child.getNodeName() != null && child.getNodeName().
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equals(BINARYRASTERFORMAT))
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{
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contentType = BINARYTYPE;
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}//if
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}//for
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//if contentype still be null, set default value
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if (contentType == null)
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{
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contentType = DEFAULTCONTENTTYPE;
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}
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}
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/* Method get text value of given child tagname*/
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private String getTextValueForGivenChildTag(Node parentNode,
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String childTagName)
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{
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String textValue = null;
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NodeList childList = parentNode.getChildNodes();
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for (int i= 0; i<childList.getLength();i++)
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{
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Node child = childList.item(i);
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if (child.getNodeName() != null && child.getNodeName().equals(childTagName))
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{
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MetaCatUtil.debugMessage("Find child node: " + childTagName, 35);
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Node textNode = child.getFirstChild();
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if (textNode.getNodeType() == Node.TEXT_NODE)
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{
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textValue = textNode.getNodeValue();
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}//if
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}//if
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}//for
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MetaCatUtil.debugMessage("The text value for element- " + childTagName +
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" is " + textValue, 30);
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return textValue;
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}//getTExtValueForGivenChildTag
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/* Find the data format node in eml2 document */
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private Node findDataFormatNodeInEML2(Document xml, String xPath,
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String targetDocId)
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{
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Node targetNode = null;
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Node node = findDataFileNodeInEML2(xml, xPath, targetDocId);
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if (node != null)
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{
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// get the phycial the prent is online, grandparent is distribution
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// the grand'parent is physical
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Node phyicalNode = node.getParentNode().getParentNode().getParentNode();
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NodeList list = phyicalNode.getChildNodes();
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for (int i = 0; i < list.getLength(); i++)
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{
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Node kid = list.item(i);
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// find dataFormat node
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if (kid.getNodeType() == node.ELEMENT_NODE &&
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kid.getNodeName().equals(DATAFORMAT))
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{
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targetNode = kid;
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break;
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} //if
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} //for
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if (targetNode != null)
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{
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MetaCatUtil.debugMessage("dataFormat node'name: " +
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targetNode.getNodeName(), 35);
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}
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}//if
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return targetNode;
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}
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/* Find the datafile node */
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private Node findDataFileNodeInEML2(Document xml, String xPath,
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String targetDocId)
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{
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Node dataFileNode = null;
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NodeList list = null;
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try
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{
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list = XPathAPI.selectNodeList(xml, xPath);
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}
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catch (Exception e)
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{
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// catch an error and return null
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MetaCatUtil.debugMessage("Error in findDataFileNode: "+e.getMessage(), 30);
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return dataFileNode;
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}
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// go through the list and find target docid in online/url
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if (list != null)
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{
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for (int i = 0; i < list.getLength(); i++)
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318
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{
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Node node = list.item(i);
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Node textNode = node.getFirstChild();
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if (textNode.getNodeType() == node.TEXT_NODE)
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{
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String URLData = textNode.getNodeValue();
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MetaCatUtil.debugMessage("online/url text data: " + URLData, 30);
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//Only handle ecogrid data file
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326
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if (URLData.indexOf(DBSAXHandler.ECOGRID) != -1 )
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{
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// Get docid from url
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String docId = MetaCatUtil.
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getAccessionNumberFromEcogridIdentifier(URLData);
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// Get rid of revision
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docId = MetaCatUtil.getDocIdFromAccessionNumber(docId);
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MetaCatUtil.debugMessage("docid from url element in xml is: " +
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docId, 30);
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//if this docid equals target one, we find it
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if (docId != null && docId.equals(targetDocId))
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337
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{
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338
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MetaCatUtil.debugMessage("Find target docid in online/url: " +
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339
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docId, 30);
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340
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dataFileNode = node;
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341
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break;
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342
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}
|
343
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} //if
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344
|
|
345
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} //if
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346
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} //for
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347
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}//if
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348
|
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349
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return dataFileNode;
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350
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}//findDataFileNode
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351
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|
352
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/* Get relative docid list and packagetype */
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353
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private Vector getRelativeDocIdList(String id)
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354
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{
|
355
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Vector docList = new Vector();
|
356
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String sql = "SELECT packagetype, subject from xml_relation " +
|
357
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"where object = ?";
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358
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ResultSet rs = null;
|
359
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PreparedStatement pStmt=null;
|
360
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DBConnection conn = null;
|
361
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int serialNumber = -1;
|
362
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try
|
363
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{
|
364
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//check out DBConnection
|
365
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conn=DBConnectionPool.getDBConnection
|
366
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("ContentTypeProvider.getRelativeDocIdlist");
|
367
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serialNumber=conn.getCheckOutSerialNumber();
|
368
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pStmt = conn.prepareStatement(sql);
|
369
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// binding value
|
370
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pStmt.setString(1, id);
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371
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//execute query
|
372
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pStmt.execute();
|
373
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rs = pStmt.getResultSet();
|
374
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// get result list
|
375
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String packType = null;
|
376
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while (rs.next())
|
377
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{
|
378
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packType = rs.getString(1);
|
379
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String subject = rs.getString(2);
|
380
|
|
381
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// get rid of duplicate record and add the docid into vector
|
382
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if (!docList.contains(subject))
|
383
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{
|
384
|
|
385
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docList.add(subject);
|
386
|
}
|
387
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}//while
|
388
|
|
389
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// set up data package type
|
390
|
if ((MetaCatUtil.getOptionList(MetaCatUtil.getOption("packagedoctype"))).
|
391
|
contains(packType))
|
392
|
{
|
393
|
//this is beta4 or beta6 version
|
394
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MetaCatUtil.debugMessage("This is beta package", 30);
|
395
|
packageType = BETA;
|
396
|
}
|
397
|
else if ((MetaCatUtil.getOptionList
|
398
|
(MetaCatUtil.getOption("eml2_0_0namespace"))).contains(packType))
|
399
|
{
|
400
|
// this eml 2 document
|
401
|
MetaCatUtil.debugMessage("This is EML2.0.0 package", 30);
|
402
|
packageType = EML2;
|
403
|
}
|
404
|
else if ((MetaCatUtil.getOptionList
|
405
|
(MetaCatUtil.getOption("eml2_0_1namespace"))).contains(packType))
|
406
|
{
|
407
|
// this eml 2 document
|
408
|
MetaCatUtil.debugMessage("This is EML2.0.1 package", 30);
|
409
|
packageType = EML2;
|
410
|
}
|
411
|
|
412
|
|
413
|
|
414
|
}//try
|
415
|
catch(SQLException e)
|
416
|
{
|
417
|
|
418
|
MetaCatUtil.debugMessage("ContenTypProvider.getRelativeDoclist1 " +
|
419
|
e.getMessage(), 30);
|
420
|
}//catch
|
421
|
finally
|
422
|
{
|
423
|
try
|
424
|
{
|
425
|
pStmt.close();
|
426
|
}
|
427
|
catch (SQLException ee)
|
428
|
{
|
429
|
MetaCatUtil.debugMessage("ContenTypProvider.getRelativeDoclist2 " +
|
430
|
ee.getMessage(), 30);
|
431
|
}
|
432
|
finally
|
433
|
{
|
434
|
DBConnectionPool.returnDBConnection(conn, serialNumber);
|
435
|
}
|
436
|
}//finally
|
437
|
|
438
|
return docList;
|
439
|
}// getRelativeDocIdList
|
440
|
|
441
|
/* Method to get physical document for data file in xml_documents table for
|
442
|
* beta eml package
|
443
|
*/
|
444
|
private String getTargetDocIdForBeta(Vector list, String targetType)
|
445
|
{
|
446
|
String docId = null;
|
447
|
// make sure list is not empty
|
448
|
if (list.isEmpty())
|
449
|
{
|
450
|
|
451
|
return docId;
|
452
|
}
|
453
|
// get sql command
|
454
|
String sql = "SELECT doctype, docid from xml_documents where docid in (";
|
455
|
// the first element
|
456
|
sql = sql + "'"+(String)list.elementAt(0) + "'";
|
457
|
for (int i=1; i<list.size(); i++)
|
458
|
{
|
459
|
String docid = (String) list.elementAt(i);
|
460
|
sql = sql + ", '" + docid + "'";
|
461
|
}//for
|
462
|
// add parensis
|
463
|
sql = sql + ")";
|
464
|
MetaCatUtil.debugMessage("SQL for select doctype: "+ sql, 35);
|
465
|
ResultSet rs = null;
|
466
|
PreparedStatement pStmt=null;
|
467
|
DBConnection conn = null;
|
468
|
int serialNumber = -1;
|
469
|
try
|
470
|
{
|
471
|
//check out DBConnection
|
472
|
conn=DBConnectionPool.getDBConnection
|
473
|
("ContentTypeProvider.setPhycialDocIdForBeta");
|
474
|
serialNumber=conn.getCheckOutSerialNumber();
|
475
|
pStmt = conn.prepareStatement(sql);
|
476
|
//execute query
|
477
|
pStmt.execute();
|
478
|
rs = pStmt.getResultSet();
|
479
|
// get result list
|
480
|
while (rs.next())
|
481
|
{
|
482
|
String packType = rs.getString(1);
|
483
|
String targetId = rs.getString(2);
|
484
|
// find physical document
|
485
|
if ((MetaCatUtil.getOptionList(MetaCatUtil.getOption(targetType))).
|
486
|
contains(packType))
|
487
|
{
|
488
|
// assign physical document and jump out the while loop
|
489
|
docId = targetId;
|
490
|
break;
|
491
|
}
|
492
|
}//while
|
493
|
|
494
|
}//try
|
495
|
catch(SQLException e)
|
496
|
{
|
497
|
|
498
|
MetaCatUtil.debugMessage("ContenTypProvider.setPhysicalDocIdForBeta1 " +
|
499
|
e.getMessage(), 30);
|
500
|
}//catch
|
501
|
finally
|
502
|
{
|
503
|
try
|
504
|
{
|
505
|
pStmt.close();
|
506
|
}
|
507
|
catch(SQLException ee)
|
508
|
{
|
509
|
MetaCatUtil.debugMessage("ContenTypProvider.setPhysicalDocIdForBeta2 " +
|
510
|
ee.getMessage(), 30);
|
511
|
}//catch
|
512
|
finally
|
513
|
{
|
514
|
DBConnectionPool.returnDBConnection(conn, serialNumber);
|
515
|
}
|
516
|
}//finally
|
517
|
MetaCatUtil.debugMessage("target docid is: "+ docId + " "+
|
518
|
"for target doctype: "+targetType, 25);
|
519
|
return docId;
|
520
|
}
|
521
|
|
522
|
|
523
|
|
524
|
|
525
|
/* Parser the beta physical document and find the value in format element*/
|
526
|
private void parsePhysicalDocumentForBeta(String physicalDocid)
|
527
|
{
|
528
|
String xmlDoc = null;
|
529
|
try
|
530
|
{
|
531
|
DocumentImpl doc = new DocumentImpl(physicalDocid);
|
532
|
xmlDoc = doc.toString();
|
533
|
}
|
534
|
catch (Exception e)
|
535
|
{
|
536
|
contentType = DEFAULTCONTENTTYPE;
|
537
|
MetaCatUtil.debugMessage("Error in ContentTypeProvider." +
|
538
|
"parsePhysicalDocumentForBeta()" + e.getMessage(), 30);
|
539
|
return;
|
540
|
}
|
541
|
// get format element's text value
|
542
|
String format = getTextValueFromPath(new StringReader(xmlDoc), FORMATPATH);
|
543
|
|
544
|
if (format == null)
|
545
|
{
|
546
|
// if couldn't find the format, set contentype default value;
|
547
|
contentType = DEFAULTCONTENTTYPE;
|
548
|
}
|
549
|
else
|
550
|
{
|
551
|
// if can find a format and look up from hash to get value
|
552
|
contentType = lookUpContentType(format);
|
553
|
// couldn't find the content type for this format in hash table
|
554
|
if (contentType == null)
|
555
|
{
|
556
|
//set default vlaue
|
557
|
contentType = DEFAULTCONTENTTYPE;
|
558
|
}//if
|
559
|
}//else
|
560
|
}//parsePhysicalDocumentForBeta
|
561
|
|
562
|
private String getTextValueFromPath(StringReader xml, String xPath)
|
563
|
{
|
564
|
String textValue = null;
|
565
|
// get nodelist from doc by path
|
566
|
try
|
567
|
{
|
568
|
NodeList list = EMLParser.getPathContent(xml, xPath);
|
569
|
Node elementNode = list.item(0);
|
570
|
Node textNode = elementNode.getFirstChild();
|
571
|
if (textNode.getNodeType() == Node.TEXT_NODE)
|
572
|
{
|
573
|
textValue = textNode.getNodeValue();// get value
|
574
|
}
|
575
|
|
576
|
}
|
577
|
catch (Exception e)
|
578
|
{
|
579
|
MetaCatUtil.debugMessage("error in ContentTypeProvider."+
|
580
|
"getTextValueFromPath: "+e.getMessage(), 30);
|
581
|
}
|
582
|
MetaCatUtil.debugMessage("The text value for " + xPath + " is: "+
|
583
|
textValue, 30);
|
584
|
return textValue;
|
585
|
}//getTextValueFromPath
|
586
|
|
587
|
/* A method to look up contentype */
|
588
|
private String lookUpContentType(String format)
|
589
|
{
|
590
|
String newFormat = null;
|
591
|
constructContentHashTable();
|
592
|
newFormat = format.toLowerCase().trim();
|
593
|
String type = null;
|
594
|
type = (String)contentTypeHash.get(newFormat);
|
595
|
MetaCatUtil.debugMessage("contentType looked from hashtalbe is: " +
|
596
|
type, 30);
|
597
|
return type;
|
598
|
}// lookupcontentypes
|
599
|
|
600
|
/* Construct content type hashtable */
|
601
|
private void constructContentHashTable()
|
602
|
{
|
603
|
contentTypeHash.put(TEXT, TEXTYPE);
|
604
|
contentTypeHash.put(XML, XMLTYPE);
|
605
|
contentTypeHash.put(HTML,HTMLTYPE);
|
606
|
contentTypeHash.put(GIF, GIFTYPE);
|
607
|
contentTypeHash.put(JPEG, JPEGTYPE);
|
608
|
contentTypeHash.put(BMP, BMPTYPE);
|
609
|
contentTypeHash.put(TAR, TARTYPE);
|
610
|
contentTypeHash.put(ZIP, ZIPTYPE);
|
611
|
contentTypeHash.put(BINARY, BINARYTYPE);
|
612
|
|
613
|
}//constructrContentHashTable();
|
614
|
|
615
|
|
616
|
|
617
|
public static void main(String[] argus)
|
618
|
{
|
619
|
try
|
620
|
{
|
621
|
DBConnectionPool pool = DBConnectionPool.getInstance();
|
622
|
//ContentTypeProvider provider = new ContentTypeProvider("tao.9830");
|
623
|
ContentTypeProvider provider = new ContentTypeProvider("tao.0001");
|
624
|
String str = provider.getContentType();
|
625
|
MetaCatUtil.debugMessage("content type is : " + str, 20);
|
626
|
}
|
627
|
catch(Exception e)
|
628
|
{
|
629
|
MetaCatUtil.debugMessage("erorr in Schemalocation.main: " +
|
630
|
e.getMessage(), 30);
|
631
|
}
|
632
|
}
|
633
|
}//ContentTypeProvider
|