Java tutorial
/* * Copyright 2011 SearchWorkings.org * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.solr.explorer.client.plugin.terms.ui; import com.google.gwt.event.dom.client.KeyDownEvent; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.SuggestBox; import com.google.gwt.user.client.ui.SuggestOracle; import com.google.gwt.user.client.ui.TextBox; import org.apache.solr.explorer.client.core.manager.solr.admin.SolrCore; import org.apache.solr.explorer.client.core.plugin.PluginBase; import org.apache.solr.explorer.client.core.ui.searchpane.SearchPane; import org.apache.solr.explorer.client.util.Callback; import org.apache.solr.explorer.client.plugin.terms.manager.TermsManager; import org.apache.solr.explorer.client.plugin.terms.model.config.TermsConfig; import org.apache.solr.explorer.client.plugin.terms.model.context.TermsContext; import org.apache.solr.explorer.client.plugin.terms.model.result.TermEntry; import org.apache.solr.explorer.client.plugin.terms.model.result.TermResult; import org.apache.solr.explorer.client.plugin.terms.model.result.TermsResult; import org.gwtoolbox.ioc.core.client.annotation.Component; import org.gwtoolbox.ioc.core.client.annotation.Inject; import org.gwtoolbox.widget.client.event.EnterKeyHandler; import java.util.ArrayList; import java.util.List; /** * @author Uri Boness */ @Component public class SearchAutoCompletionPlugin extends PluginBase { private SearchPane searchPane; private TermsManager termsManager; private TermsContext termsContext; private SuggestOracle oracle; private SuggestBox suggestBox; @Override public void init(SolrCore solrCore) { setActive(solrCore.getConfiguration().isActive(TermsConfig.class)); if (!isActive()) { searchPane.setSearchTextBox(new TextBox()); return; } oracle = new SuggestOracle() { public void requestSuggestions(final Request request, final Callback callback) { findSuggestions(request.getQuery(), new org.apache.solr.explorer.client.util.Callback<List<Suggestion>>() { public void onSuccess(List<Suggestion> suggestions) { callback.onSuggestionsReady(request, new Response(suggestions)); } }); } }; suggestBox = new SuggestBox(oracle); suggestBox.setPopupStyleName("AutoCompletionPopup"); suggestBox.addKeyDownHandler(new EnterKeyHandler() { @Override protected void onEnter(KeyDownEvent keyDownEvent) { if (!suggestBox.isSuggestionListShowing()) { searchPane.executeSearch(); } } }); suggestBox.setAutoSelectEnabled(false); suggestBox.setAnimationEnabled(true); searchPane.setSearchTextBox(suggestBox); } //============================================ Setter/Getter Methods =============================================== @Inject public void setSearchPane(SearchPane searchPane) { this.searchPane = searchPane; } @Inject public void setTermsManager(TermsManager termsManager) { this.termsManager = termsManager; } @Inject public void setTermsContext(TermsContext termsContext) { this.termsContext = termsContext; } //================================================ Helper Methods ================================================== private void findSuggestions(String query, final AsyncCallback<List<SuggestOracle.Suggestion>> callback) { if (!termsContext.isEnabled()) { callback.onSuccess(new ArrayList<SuggestOracle.Suggestion>()); return; } String[] terms = query.trim().split("\\s"); String lastTerm = terms[terms.length - 1]; termsContext.setPrefix(lastTerm); termsManager.getTerms(new Callback<TermsResult>() { public void onSuccess(TermsResult termsResult) { List<SuggestOracle.Suggestion> suggestions = new ArrayList<SuggestOracle.Suggestion>(); for (TermResult termResult : termsResult.getTermResultByFieldName().values()) { for (TermEntry termEntry : termResult.getEntries()) { suggestions.add(new TermSuggestion(termEntry)); } } callback.onSuccess(suggestions); } }); } //================================================= Inner Classes ================================================== private class TermSuggestion implements SuggestOracle.Suggestion { private final TermEntry termEntry; private TermSuggestion(TermEntry termEntry) { this.termEntry = termEntry; } public String getDisplayString() { return termEntry.getValue() + " (" + termEntry.getCount() + ")"; } public String getReplacementString() { String query = suggestBox.getText(); int index = query.lastIndexOf(' '); if (index > 0) { query = query.substring(0, index) + " "; } else { query = ""; } String entryValue = termEntry.getValue(); if (entryValue.matches(".+\\s.+")) { entryValue = "\"" + entryValue + "\""; } return query + entryValue; } } }