cmssearchparameters.java

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/*
 * File   : $Source: /usr/local/cvs/opencms/src/org/opencms/search/CmsSearchParameters.java,v $
 * Date   : $Date: 2007-08-23 12:42:17 $
 * Version: $Revision: 1.11 $
 *
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) 2002 - 2007 Alkacon Software GmbH (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software GmbH, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.search;

import org.opencms.i18n.CmsEncoder;
import org.opencms.main.CmsException;
import org.opencms.main.CmsIllegalArgumentException;
import org.opencms.main.CmsLog;
import org.opencms.main.OpenCms;
import org.opencms.search.fields.CmsSearchField;
import org.opencms.util.CmsStringUtil;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.collections.ListUtils;
import org.apache.commons.logging.Log;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;

/**
 * Contains the search parameters for a call to <code>{@link org.opencms.search.CmsSearchIndex#search(org.opencms.file.CmsObject, CmsSearchParameters)}</code>.<p>
 * 
 * Primary purpose is translation of search arguments to response parameters and from request parameters as 
 * well as support for creation of restrictions of several search query parameter sets. <p>
 * 
 * @author Alexander Kandzior 
 * 
 * @version $Revision: 1.11 $ 
 * 
 * @since 6.0.0 
 */
public class CmsSearchParameters {

    /** Sort result documents by date of creation, then score. */
    public static final Sort SORT_DATE_CREATED = new Sort(new SortField[] {
        new SortField(CmsSearchField.FIELD_DATE_CREATED, SortField.STRING, true),
        SortField.FIELD_SCORE});

    /** Sort result documents by date of last modification, then score. */
    public static final Sort SORT_DATE_LASTMODIFIED = new Sort(new SortField[] {
        new SortField(CmsSearchField.FIELD_DATE_LASTMODIFIED, SortField.STRING, true),
        SortField.FIELD_SCORE});

    /** Default sort order (by document score - for this <code>null</code> gave best performance). */
    public static final Sort SORT_DEFAULT = null;

    /** Names of the default sort options. */
    public static final String[] SORT_NAMES = {
        "SORT_DEFAULT",
        "SORT_DATE_CREATED",
        "SORT_DATE_LASTMODIFIED",
        "SORT_TITLE"};

    /** Sort result documents by title, then score. */
    public static final Sort SORT_TITLE = new Sort(new SortField[] {
        new SortField(CmsSearchField.FIELD_TITLE),
        SortField.FIELD_SCORE});

    /** The log object for this class. */
    private static final Log LOG = CmsLog.getLog(CmsSearchParameters.class);

    /** The number of displayed pages returned by getPageLinks(). */
    protected int m_displayPages;

    /** The number of matches per page. */
    protected int m_matchesPerPage;

    /** If <code>true</code>, the category count is calculated for all search results. */
    private boolean m_calculateCategories;

    /** The list of categories to limit the search to. */
    private List m_categories;

    /** Indicates if all fields should be used for generating the excerpt, regardless if they have been searched or not. */
    private boolean m_excerptOnlySearchedFields;

    /** The list of search index fields to search in. */
    private List m_fields;

    /** The index to search. */
    private CmsSearchIndex m_index;

    /** The creation date the resources have to have as maximum. */
    private long m_maxDateCreated;

    /** The last modification date the resources have to have as maximum. */
    private long m_maxDateLastModified;

    /** The creation date the resources have to have as minimum. */
    private long m_minDateCreated;

    /** The last modification date the resources have to have as minimum. */
    private long m_minDateLastModified;

    /** The current result page. */
    private int m_page;

    /** The search query to use. */
    private String m_query;

    /** The minimum length of the search query. */
    private int m_queryLength;

    /** Only resource that are sub-resource of one of the search roots are included in the search result. */
    private List m_roots;

    /** The sort order for the search. */
    private Sort m_sort;

    /**
     * Creates a new search parameter instance with no search query and 
     * default values for the remaining parameters. <p>
     * 
     * Before using this search parameters for a search method 
     * <code>{@link #setQuery(String)}</code> has to be invoked. <p>
     * 
     */
    public CmsSearchParameters() {

        this("");
    }

    /**
     * Creates a new search parameter instance with the provided search query and 
     * default values for the remaining parameters. <p>
     * 
     * Only the "meta" field (combination of content and title) will be used for search. 
     * No search root restriction is chosen. 
     * No category restriction is used. 
     * No categorie counts are calculated for the result. 
     * Sorting is turned off. This is a simple but fast setup. <p>
     * 
     * @param query the query to search for 
     */
    public CmsSearchParameters(String query) {

        this(query, null, null, null, false, null);

    }

    /**
     * Creates a new search parameter instance with the provided parameter values.<p>
     * 
     * @param query the search term to search the index
     * @param fields the list of fields to search
     * @param roots only resource that are sub-resource of one of the search roots are included in the search result
     * @param categories the list of categories to limit the search to
     * @param calculateCategories if <code>true</code>, the category count is calculated for all search results
     *      (use with caution, this option uses much performance)
     * @param sort the sort order for the search
     */
    public CmsSearchParameters(
        String query,
        List fields,
        List roots,
        List categories,
        boolean calculateCategories,
        Sort sort) {

        super();
        m_query = (query == null) ? "" : query;
        if (fields == null) {
            fields = new ArrayList(2);
            fields.add(CmsSearchIndex.DOC_META_FIELDS[0]);
            fields.add(CmsSearchIndex.DOC_META_FIELDS[1]);
        }
        m_fields = fields;
        if (roots == null) {
            roots = new ArrayList();
        }
        m_roots = roots;
        m_categories = (categories == null) ? new LinkedList() : categories;
        m_calculateCategories = calculateCategories;
        // null sort is allowed default
        m_sort = sort;
        m_page = 1;
        m_queryLength = -1;
        m_matchesPerPage = 10;
        m_displayPages = 10;

        m_minDateCreated = Long.MIN_VALUE;
        m_maxDateCreated = Long.MAX_VALUE;
        m_minDateLastModified = Long.MIN_VALUE;
        m_maxDateLastModified = Long.MAX_VALUE;
    }

    /**
     * Returns wether category counts are calculated for search results or not. <p>
     * 
     * @return a boolean that tells wether category counts are calculated for search results or not
     */
    public boolean getCalculateCategories() {

        return m_calculateCategories;
    }

    /**
     * Returns the list of categories to limit the search to.<p>
     *
     * @return the list of categories to limit the search to
     */
    public List getCategories() {

        return m_categories;
    }

    /**
     * Returns the maximum number of pages which should be shown.<p> 
     * 
     * @return the maximum number of pages which should be shown
     */
    public int getDisplayPages() {

        return m_displayPages;
    }

    /**
     * Returns the list of search index field names (Strings) to search in.<p>
     *
     * @return the list of search index field names (Strings) to search in
     */
    public List getFields() {

        return m_fields;
    }

    /**
     * Get the name of the index for the search.<p>
     * 
     * @return the name of the index for the search
     */
    public String getIndex() {

        return m_index.getName();
    }

    /**
     * Gets the number of matches displayed on each page.<p>
     * 
     * @return matches per result page
     */
    public int getMatchesPerPage() {

        return m_matchesPerPage;
    }

    /**
     * Returns the creation date the resources have to have as maximum.<p>
     *
     * @return the creation date the resources have to have as maximum
     */
    public long getMaxDateCreated() {

        return m_maxDateCreated;
    }

    /**
     * Returns the last modification date the resources have to have as maximum.<p>
     *
     * @return the last modification date the resources have to have as maximum
     */
    public long getMaxDateLastModified() {

        return m_maxDateLastModified;
    }

    /**
     * Returns the creation date the resources have to have as minimum.<p>
     *
     * @return the creation date the resources have to have as minimum
     */
    public long getMinDateCreated() {

        return m_minDateCreated;
    }

    /**
     * Returns the last modification date the resources have to have as minimum.<p>
     *
     * @return the last modification date the resources have to have as minimum
     */