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OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2014 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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 3 of the License, or
 *  (at your option) any later version.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see .
 **/

package com.jaeksoft.searchlib.web.controller.query;

import java.util.ArrayList;
import java.util.List;

import org.zkoss.bind.annotation.BindingParam;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.GlobalCommand;
import org.zkoss.bind.annotation.NotifyChange;

import com.jaeksoft.searchlib.Client;
import com.jaeksoft.searchlib.SearchLibException;
import com.jaeksoft.searchlib.collapse.CollapseFunctionField;
import com.jaeksoft.searchlib.collapse.CollapseParameters;
import com.jaeksoft.searchlib.collapse.CollapseParameters.Function;
import com.jaeksoft.searchlib.request.AbstractSearchRequest;
import com.jaeksoft.searchlib.schema.Indexed;
import com.jaeksoft.searchlib.schema.SchemaField;

public class CollapsingController extends AbstractQueryController {

	private transient List indexedFields;

	private transient List functionFields;

	private transient final CollapseFunctionField functionField;

	public CollapsingController() throws SearchLibException {
		super();
		functionField = new CollapseFunctionField(Function.MAX, "");
	}

	@Override
	protected void reset() throws SearchLibException {
		indexedFields = null;
	}

	public CollapseParameters.Mode[] getCollapseModes() {
		return CollapseParameters.Mode.values();
	}

	public CollapseParameters.Type[] getCollapseTypes() {
		return CollapseParameters.Type.values();
	}

	public List getIndexedFields() throws SearchLibException {
		synchronized (this) {
			Client client = getClient();
			if (client == null)
				return null;
			if (indexedFields != null)
				return indexedFields;
			indexedFields = new ArrayList();
			indexedFields.add(null);
			for (SchemaField field : client.getSchema().getFieldList())
				if (field.checkIndexed(Indexed.YES))
					indexedFields.add(field.getName());
			return indexedFields;
		}
	}

	public List getFunctionFields() throws SearchLibException {
		if (functionFields != null)
			return functionFields;
		functionFields = new ArrayList();
		getIndexedFields();
		if (indexedFields != null)
			functionFields.addAll(indexedFields);
		functionFields.add(CollapseFunctionField.DISTANCE);
		return functionFields;
	}

	@Command
	@Override
	public void reload() throws SearchLibException {
		synchronized (this) {
			indexedFields = null;
			super.reload();
		}
	}

	@GlobalCommand
	@Override
	public void eventSchemaChange(Client client) throws SearchLibException {
		reload();
	}

	public Function[] getFunctionList() {
		return Function.values();
	}

	/**
	 * @return the functionField
	 */
	public CollapseFunctionField getFunctionField() {
		return functionField;
	}

	@Command
	@NotifyChange("*")
	public void onAddFunctionField() throws SearchLibException {
		((AbstractSearchRequest) getRequest())
				.addCollapseFunctionField(functionField);
	}

	@Command
	@NotifyChange("*")
	public void onRemoveFonctionField(
			@BindingParam("functionfield") CollapseFunctionField functionField)
			throws SearchLibException {
		((AbstractSearchRequest) getRequest())
				.removeCollapseFunctionField(functionField);
	}
}