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annotate software/eXist/mpdl-modules/src/org/exist/xquery/modules/mpdltext/ExternalObject.java @ 9:1ec29fdd0db8

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neue .lex Dateien f?r Normalisierung / externe Objekte update
author Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
date Tue, 22 Feb 2011 16:03:45 +0100
parents 2396a569e446
children 5df60f24e997
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1 /*
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2 * eXist Open Source Native XML Database: Extension module
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3 * Copyright (C) 2008 Josef Willenborg
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4 * jwillenborg@mpiwg-berlin.mpg.de
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5 * http://www.mpiwg-berlin.mpg.de
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6 *
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7 * This program is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation; either version 2
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10 * of the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 * GNU Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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20 *
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21 * $Id: TextModule.java $
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22 */
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23 package org.exist.xquery.modules.mpdltext;
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24
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25 import java.util.ArrayList;
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26
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27 import org.exist.dom.QName;
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28 import org.exist.xquery.BasicFunction;
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29 import org.exist.xquery.Cardinality;
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30 import org.exist.xquery.FunctionSignature;
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31 import org.exist.xquery.XPathException;
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32 import org.exist.xquery.XQueryContext;
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33 import org.exist.xquery.value.Sequence;
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34 import org.exist.xquery.value.SequenceType;
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35 import org.exist.xquery.value.StringValue;
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36 import org.exist.xquery.value.Type;
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37 import org.exist.xquery.value.ValueSequence;
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38
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39 import de.mpg.mpiwg.berlin.mpdl.exception.ApplicationException;
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40 import de.mpg.mpiwg.berlin.mpdl.externalObjects.app.ExtElement;
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41 import de.mpg.mpiwg.berlin.mpdl.externalObjects.app.ExtObject;
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42 import de.mpg.mpiwg.berlin.mpdl.externalObjects.app.ExtQuery;
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43 import de.mpg.mpiwg.berlin.mpdl.externalObjects.app.ExternalObjectsHandler;
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44
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45 /**
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46 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
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47 */
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48 public class ExternalObject extends BasicFunction {
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49
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50 public final static FunctionSignature signature =
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51 new FunctionSignature(
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52 new QName("externalObject", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX),
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53 "A function which add, update, delete or read external elements",
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54 new SequenceType[] { new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
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55 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE),
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56 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE) },
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57 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE));
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58
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59 public ExternalObject(XQueryContext context) {
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60 super(context, signature);
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61 }
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62
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63 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
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64 Sequence operation = args[0]; // read, update or delete
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65 Sequence type = args[1]; // element, query
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66 Sequence object = args[2]; // the object as an xml string
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67 if (operation.isEmpty() || type.isEmpty() || object.isEmpty())
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68 return Sequence.EMPTY_SEQUENCE;
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69 String operationStr = operation.getStringValue();
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70 String typeStr = type.getStringValue();
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71 String objectStr = object.getStringValue();
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72
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73 ValueSequence result = null;
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74 String resultStr = "";
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75 try {
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76 ExternalObjectsHandler externalObjectsHandler = ExternalObjectsHandler.getInstance();
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77 if (typeStr.equals("element")) {
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78 ExtElement e = ExtElement.parseXmlStr(objectStr);
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79 if (operationStr.equals("read")) {
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80 ArrayList<ExtElement> elems = externalObjectsHandler.readExternalElements(e);
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81 if (elems != null && elems.size() > 0) {
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82 resultStr = "<result>";
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83 for (int i=0; i<elems.size(); i++) {
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84 ExtElement elem = elems.get(i);
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85 String elemXmlStr = elem.getXmlString();
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86 resultStr = resultStr + elemXmlStr;
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87 }
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88 resultStr = resultStr + "</result>";
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89 }
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90 } else if (operationStr.equals("create")) {
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91 externalObjectsHandler.createExternalElement(e);
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92 } else if (operationStr.equals("update")) {
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93 externalObjectsHandler.updateExternalElement(e);
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94 } else if (operationStr.equals("delete")) {
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95 externalObjectsHandler.deleteExternalElement(e);
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96 }
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97 } else if (typeStr.equals("query")) {
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98 ExtQuery q = ExtQuery.parseXmlStr(objectStr);
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99 if (operationStr.equals("read")) {
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100 ArrayList<ExtObject> objects = externalObjectsHandler.readExternalObjects(q);
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101 if (objects != null && objects.size() > 0) {
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102 resultStr = "<result>";
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103 for (int i=0; i<objects.size(); i++) {
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104 ExtObject obj = objects.get(i);
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105 String elemXmlStr = obj.getXmlString();
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106 resultStr = resultStr + elemXmlStr;
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107 }
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108 resultStr = resultStr + "</result>";
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109 }
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110 } else if (operationStr.equals("create")) {
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111 externalObjectsHandler.createExternalObject(q);
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112 } else if (operationStr.equals("update")) {
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113 externalObjectsHandler.updateExternalObject(q);
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114 } else if (operationStr.equals("delete")) {
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115 externalObjectsHandler.deleteExternalObject(q);
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116 }
6
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117 }
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118 result = new ValueSequence();
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119 result.add(new StringValue(resultStr));
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120 } catch (ApplicationException e) {
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121 throw new XPathException(e);
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122 }
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123 return result;
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124 }
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125
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126 }