1 | /* |
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2 | * Copyright (C) 2014 CLARIN |
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3 | * |
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4 | * This program is free software: you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License as published by |
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6 | * the Free Software Foundation, either version 3 of the License, or |
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7 | * (at your option) any later version. |
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * GNU General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU General Public License |
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15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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16 | */ |
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17 | package eu.clarin.cmdi.vlo.wicket.model; |
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18 | |
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19 | import eu.clarin.cmdi.vlo.VloWicketApplication; |
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20 | import java.util.Collection; |
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21 | import java.util.Iterator; |
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22 | import org.apache.solr.common.SolrDocument; |
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23 | import org.apache.wicket.model.AbstractReadOnlyModel; |
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24 | import org.apache.wicket.model.IModel; |
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25 | import org.apache.wicket.util.convert.IConverter; |
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26 | |
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27 | /** |
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28 | * Model that provides field values as String values for a given field values |
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29 | * model, both for singular values and multiple values (imploding the latter |
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30 | * into a single string) |
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31 | * |
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32 | * @author twagoo |
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33 | */ |
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34 | public class SolrFieldStringModel extends AbstractReadOnlyModel<String> { |
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35 | |
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36 | private final IModel<Collection<Object>> fieldModel; |
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37 | private final String field; |
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38 | |
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39 | /** |
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40 | * Wraps the document model and specified field name into a |
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41 | * {@link SolrFieldModel} to obtain field values |
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42 | * |
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43 | * @param documentModel model of document that holds the field values |
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44 | * @param fieldName name of the field to take value from |
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45 | */ |
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46 | public SolrFieldStringModel(IModel<SolrDocument> documentModel, String fieldName) { |
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47 | fieldModel = new SolrFieldModel<>(documentModel, fieldName); |
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48 | field = fieldName; |
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49 | } |
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50 | |
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51 | @Override |
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52 | public String getObject() { |
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53 | final Collection<Object> fieldValues = fieldModel.getObject(); |
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54 | if (fieldValues != null) { |
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55 | return getValueString(fieldValues); |
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56 | } |
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57 | return null; |
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58 | } |
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59 | |
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60 | private String getValueString(final Collection<Object> fieldValues) { |
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61 | final Iterator<Object> iterator = fieldValues.iterator(); |
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62 | if (iterator.hasNext()) { |
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63 | final String firstValue = iterator.next().toString(); |
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64 | if (iterator.hasNext()) { |
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65 | return getMultipleValuesString(firstValue, iterator); |
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66 | } else { |
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67 | return postprocessValue(firstValue); |
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68 | } |
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69 | } else { |
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70 | return null; |
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71 | } |
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72 | } |
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73 | |
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74 | protected String getMultipleValuesString(final String firstValue, final Iterator<Object> iterator) { |
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75 | // for multiple value strings, run every individual value through the converter |
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76 | final StringBuilder valuesBuilder = new StringBuilder(postprocessValue(firstValue)).append("; "); |
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77 | while (iterator.hasNext()) { |
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78 | valuesBuilder.append(postprocessValue(iterator.next().toString())); |
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79 | if (iterator.hasNext()) { |
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80 | valuesBuilder.append("; "); |
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81 | } |
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82 | } |
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83 | return valuesBuilder.toString(); |
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84 | } |
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85 | |
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86 | @Override |
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87 | public void detach() { |
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88 | super.detach(); |
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89 | fieldModel.detach(); |
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90 | } |
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91 | |
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92 | private String postprocessValue(String value) { |
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93 | if (value != null) { |
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94 | final IConverter<String> converter = getFieldValueConverter(); |
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95 | if (converter != null) { |
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96 | return converter.convertToString(value, null); |
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97 | } |
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98 | } |
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99 | return value; |
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100 | } |
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101 | |
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102 | private IConverter<String> getFieldValueConverter() { |
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103 | return VloWicketApplication.get().getFieldValueConverterProvider().getConverter(field); |
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104 | } |
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105 | |
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106 | } |
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