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1
/**
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 *  '$RCSfile$'
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 *    Purpose: A Class that represents a structured query, and can be
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 *             constructed from an XML serialization conforming to
5
 *             pathquery.dtd. The printSQL() method can be used to print
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 *             a SQL serialization of the query.
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 *  Copyright: 2000 Regents of the University of California and the
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 *             National Center for Ecological Analysis and Synthesis
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 *    Authors: Matt Jones
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 *
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 *   '$Author: tao $'
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 *     '$Date: 2007-07-26 18:25:03 -0700 (Thu, 26 Jul 2007) $'
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 * '$Revision: 3329 $'
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
28
 */
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30
package edu.ucsb.nceas.metacat;
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32
import java.util.Vector;
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import org.apache.log4j.Logger;
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35
/** a utility class that represents a single term in a query */
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public class QueryTerm
37
{
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    private static Logger log = Logger.getLogger(QueryTerm.class);
39

    
40
    private boolean casesensitive = false;
41

    
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    private String searchmode = null;
43

    
44
    private String value = null;
45

    
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    private String pathexpr = null;
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    private boolean percentageSymbol = false;
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    private int countPercentageSearchItem = 0;
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52
    private boolean inUnionGroup = false;
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    public static final String CONTAINS = "contains";
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56
    public static final String EQUALS = "equals";
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58
    /**
59
     * Construct a new instance of a query term for a free text search (using
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     * the value only)
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     *
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     * @param casesensitive
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     *            flag indicating whether case is used to match
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     * @param searchmode
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     *            determines what kind of substring match is performed (one of
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     *            starts-with|ends-with|contains|matches-exactly)
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     * @param value
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     *            the text value to match
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     */
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    public QueryTerm(boolean casesensitive, String searchmode, String value)
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    {
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        this.casesensitive = casesensitive;
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        this.searchmode = searchmode;
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        this.value = value;
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    }
76

    
77
    /**
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     * Construct a new instance of a query term for a structured search
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     * (matching the value only for those nodes in the pathexpr)
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     *
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     * @param casesensitive
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     *            flag indicating whether case is used to match
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     * @param searchmode
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     *            determines what kind of substring match is performed (one of
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     *            starts-with|ends-with|contains|matches-exactly)
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     * @param value
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     *            the text value to match
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     * @param pathexpr
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     *            the hierarchical path to the nodes to be searched
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     */
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    public QueryTerm(boolean casesensitive, String searchmode, String value,
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            String pathexpr)
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    {
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        this(casesensitive, searchmode, value);
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        this.pathexpr = pathexpr;
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    }
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    /** determine if the QueryTerm is case sensitive */
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    public boolean isCaseSensitive()
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    {
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        return casesensitive;
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    }
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    /** get the searchmode parameter */
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    public String getSearchMode()
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    {
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        return searchmode;
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    }
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    /** get the Value parameter */
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    public String getValue()
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    {
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        return value;
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    }
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    /** get the path expression parameter */
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    public String getPathExpression()
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    {
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        return pathexpr;
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    }
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    /** get the percentage count for one query term */
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    public int getPercentageSymbolCount()
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    {
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        return countPercentageSearchItem;
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    }
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    /**
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     * Set the query term in a union group
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     * @param inUnionGroup
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     */
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    public void setInUnionGroup (boolean inUnionGroup)
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    {
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    	this.inUnionGroup = inUnionGroup;
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    }
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    /**
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     * If this query group in Union group
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     * @return
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     */
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    public boolean isInUnionGroup()
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    {
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    	return this.inUnionGroup;
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    }
145

    
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    /**
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     * create a SQL serialization of the query that this instance represents
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     */
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    public String printSQL(boolean useXMLIndex)
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    {
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        StringBuffer self = new StringBuffer();
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        // Uppercase the search string if case match is not important
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        String casevalue = null;
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        String nodedataterm = null;
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        boolean notEqual = false;
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        if (casesensitive) {
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            nodedataterm = "nodedata";
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            casevalue = value;
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        } else {
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            nodedataterm = "UPPER(nodedata)";
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            casevalue = value.toUpperCase();
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        }
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        // Add appropriate wildcards to search string
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        String searchexpr = null;
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        if (searchmode.equals("starts-with")) {
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            searchexpr = nodedataterm + " LIKE '" + casevalue + "%' ";
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        } else if (searchmode.equals("ends-with")) {
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            searchexpr = nodedataterm + " LIKE '%" + casevalue + "' ";
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        } else if (searchmode.equals("contains")) {
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            if (!casevalue.equals("%")) {
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                searchexpr = nodedataterm + " LIKE '%" + casevalue + "%' ";
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            } else {
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                searchexpr = nodedataterm + " LIKE '" + casevalue + "' ";
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                // find percentage symbol
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                percentageSymbol = true;
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            }
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        } else if (searchmode.equals("not-contains")) {
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        	notEqual = true;
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            searchexpr = nodedataterm + " LIKE '%" + casevalue + "%' ";
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        } else if (searchmode.equals("equals")) {
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            searchexpr = nodedataterm + " = '" + casevalue + "' ";
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        } else if (searchmode.equals("isnot-equal")) {
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        	notEqual = true;
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            searchexpr = nodedataterm + " = '" + casevalue + "' ";
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        } else {
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            String oper = null;
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            if (searchmode.equals("greater-than")) {
190
                oper = ">";
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                nodedataterm = "nodedatanumerical";
192
            } else if (searchmode.equals("greater-than-equals")) {
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                oper = ">=";
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                nodedataterm = "nodedatanumerical";
195
            } else if (searchmode.equals("less-than")) {
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                oper = "<";
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                nodedataterm = "nodedatanumerical";
198
            } else if (searchmode.equals("less-than-equals")) {
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                oper = "<=";
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                nodedataterm = "nodedatanumerical";
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            } else {
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                System.out
203
                        .println("NOT expected case. NOT recognized operator: "
204
                                + searchmode);
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                return null;
206
            }
207
            try {
208
                // it is number; numeric comparison
209
                // but we need to make sure there is no string in node data
210
                searchexpr = nodedataterm + " " + oper + " "
211
                        + new Double(casevalue) + " ";
212
            } catch (NumberFormatException nfe) {
213
                // these are characters; character comparison
214
                searchexpr = nodedataterm + " " + oper + " '" + casevalue
215
                        + "' ";
216
            }
217
        }
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219

    
220
        // to check xml_path_index can be used
221
        boolean usePathIndex = false;
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223
        // if pathexpr has been specified in metacat.properties for indexing
224
        if(pathexpr != null){
225
            if(MetaCatUtil.pathsForIndexing.contains(pathexpr)){
226
                usePathIndex = true;
227
            }
228
        }
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230
        if(usePathIndex){
231
            // using xml_path_index table.....
232
        	if(notEqual == true ){
233
        		if (!inUnionGroup)
234
        		{
235
        			self.append("SELECT DISTINCT docid from xml_path_index WHERE");
236
        			self.append(" docid NOT IN (Select docid FROM xml_path_index WHERE ");
237
        			self.append(searchexpr);
238
        			self.append("AND path LIKE '" + pathexpr + "') ");
239
        		}
240
        		else
241
        		{
242
        			//if this is in union group we need to use "OR" to modify query
243
        			self.append("("+searchexpr);
244
        			self.append("AND path LIKE '" + pathexpr + "') ");
245
        		}
246
        	} else {
247
        		if (!inUnionGroup)
248
        		{
249
        			self.append("SELECT DISTINCT docid FROM xml_path_index WHERE ");
250
        			self.append(searchexpr);
251
        			self.append("AND path LIKE '" + pathexpr + "' ");
252
        		}
253
        		else
254
        		{
255
        			//if this is in union group we need to use "OR" to modify query
256
        			self.append("("+searchexpr);
257
        			self.append("AND path LIKE '" + pathexpr + "') ");
258
        		}
259
        	}
260

    
261
        } else {
262
            // using xml_nodes and xml_index tables
263

    
264
        	if(notEqual == true){
265
        		self.append("SELECT DISTINCT docid from xml_nodes WHERE");
266
        		self.append(" docid NOT IN (Select docid FROM xml_nodes WHERE ");
267
        	} else {
268
        		self.append("(SELECT DISTINCT docid FROM xml_nodes WHERE ");
269
        	}
270
        	self.append(searchexpr);
271
        	
272
            if (pathexpr != null) {
273

    
274
                // use XML Index
275
                if (useXMLIndex) {
276
                    if (!hasAttributeInPath(pathexpr)) {
277
                        // without attributes in path
278
                        self.append("AND parentnodeid IN ");
279
                    } else {
280
                        // has a attribute in path
281
                        String attributeName = QuerySpecification
282
                            .getAttributeName(pathexpr);
283
                        self.append(
284
                            "AND nodetype LIKE 'ATTRIBUTE' AND nodename LIKE '"
285
                            + attributeName + "' ");
286
                        // and the path expression includes element content other than
287
                        // just './' or '../'
288
                        if ( (!pathexpr.startsWith(QuerySpecification.
289
                            ATTRIBUTESYMBOL)) &&
290
                            (!pathexpr.startsWith("./" +
291
                                                  QuerySpecification.ATTRIBUTESYMBOL)) &&
292
                            (!pathexpr.startsWith("../" +
293
                                                  QuerySpecification.ATTRIBUTESYMBOL))) {
294

    
295
                            self.append("AND parentnodeid IN ");
296
                            pathexpr = QuerySpecification
297
                                .newPathExpressionWithOutAttribute(pathexpr);
298
                        }
299
                    }
300
                    self.append(
301
                        "(SELECT nodeid FROM xml_index WHERE path LIKE "
302
                        + "'" + pathexpr + "') ");
303
                }
304
                else {
305
                    // without using XML Index; using nested statements instead
306
                    self.append("AND parentnodeid IN ");
307
                    self.append(useNestedStatements(pathexpr));
308
                }
309
            }
310
            else if ( (value.trim()).equals("%")) {
311
                //if pathexpr is null and search value is %, is a
312
                // percentageSearchItem
313
                // the count number will be increase one
314
                countPercentageSearchItem++;
315

    
316
            }
317
            self.append(") ");
318
        }
319

    
320
        return self.toString();
321
    }
322

    
323
    /** A method to judge if a path have attribute */
324
    private boolean hasAttributeInPath(String path)
325
    {
326
        if (path.indexOf(QuerySpecification.ATTRIBUTESYMBOL) != -1) {
327
            return true;
328
        } else {
329
            return false;
330
        }
331
    }
332

    
333
   
334
    public static String useNestedStatements(String pathexpr)
335
    {
336
        log.info("useNestedStatements()");
337
        log.info("pathexpr: " + pathexpr);
338
        StringBuffer nestedStmts = new StringBuffer();
339
        String path = pathexpr.trim();
340

    
341
        if (path.indexOf('/') == 0)
342
        {
343
            nestedStmts.append("AND parentnodeid = rootnodeid ");
344
            path = path.substring(1).trim();
345
        }
346

    
347
        do
348
        {
349
            int inx = path.indexOf('/');
350
            int predicateStart = -1;
351
            int predicateEnd;
352
            String node;
353
            Vector predicates = new Vector();
354

    
355
            // extract predicates
356
            predicateStart = path.indexOf(QuerySpecification.PREDICATE_START, predicateStart + 1);
357

    
358
            // any predicates in this node?
359
            if (inx != -1 && (predicateStart == -1 || predicateStart > inx))
360
            {
361
                // no
362
                node = path.substring(0, inx).trim();
363
                path = path.substring(inx + 1).trim();
364
            }
365
            else if (predicateStart == -1)
366
            {
367
                // no and it's the last node
368
                node = path;
369
                path = "";
370
            }
371
            else
372
            {
373
                // yes
374
                node = path.substring(0, predicateStart).trim();
375
                path = path.substring(predicateStart);
376
                predicateStart = 0;
377

    
378
                while (predicateStart == 0)
379
                {
380
                    predicateEnd = path.indexOf(QuerySpecification.PREDICATE_END,
381
                            predicateStart);
382

    
383
                    if (predicateEnd == -1)
384
                    {
385
                        log.warn("useNestedStatements(): ");
386
                        log.warn("    Invalid path: " + pathexpr);
387
                        return "";
388
                    }
389

    
390
                    predicates.add(path.substring(1, predicateEnd).trim());
391
                    path = path.substring(predicateEnd + 1).trim();
392
                    inx = path.indexOf('/');
393
                    predicateStart = path.indexOf(QuerySpecification.PREDICATE_START);
394
                }
395

    
396
                if (inx == 0)
397
                    path = path.substring(1).trim();
398
                else if (!path.equals(""))
399
                {
400
                    log.warn("useNestedStatements(): ");
401
                    log.warn("    Invalid path: " + pathexpr);
402
                    return "";
403
                }
404
            }
405

    
406
            nestedStmts.insert(0, "' ").insert(0, node).insert(0,
407
                    "(SELECT nodeid FROM xml_nodes WHERE nodename LIKE '");
408

    
409
            // for the last statement: it is without " AND parentnodeid IN "
410
            if (!path.equals(""))
411
                nestedStmts.insert(0, "AND parentnodeid IN ");
412

    
413
            if (predicates.size() > 0)
414
            {
415
                for (int n = 0; n < predicates.size(); n++)
416
                {
417
                    String predSQL = predicate2SQL((String) predicates.get(n));
418

    
419
                    if (predSQL.equals(""))
420
                        return "";
421

    
422
                    nestedStmts.append(predSQL).append(' ');
423
                }
424
            }
425

    
426
            nestedStmts.append(") ");
427
        }
428
        while (!path.equals(""));
429

    
430
        return nestedStmts.toString();
431
    }
432

    
433
    /**
434
     * 
435
     */
436
    public static String predicate2SQL(String predicate)
437
    {
438
        String path = predicate.trim();
439
        int equals = path.indexOf('=');
440
        String literal = null;
441

    
442
        if (equals != -1)
443
        {
444
            literal = path.substring(equals + 1).trim();
445
            path = path.substring(0, equals).trim();
446
            int sQuote = literal.indexOf('\'');
447
            int dQuote = literal.indexOf('"');
448

    
449
            if (sQuote == -1 && dQuote == -1)
450
            {
451
                log.warn("predicate2SQL(): ");
452
                log.warn("    Invalid or unsupported predicate: " + predicate);
453
                return "";
454
            }
455

    
456
            if (sQuote == -1 &&
457
                (dQuote != 0 ||
458
                 literal.indexOf('"', dQuote + 1) != literal.length() - 1))
459
            {
460
                log.warn("predicate2SQL(): ");
461
                log.warn("    Invalid or unsupported predicate: " + predicate);
462
                return "";
463
            }
464

    
465
            if (sQuote != 0 ||
466
                literal.indexOf('\'', sQuote + 1) != literal.length() - 1)
467
            {
468
                log.warn("predicate2SQL(): ");
469
                log.warn("    Invalid or unsupported predicate: " + predicate);
470
                return "";
471
            }
472
        }
473

    
474
        StringBuffer sql = new StringBuffer();
475
        int attribute = path.indexOf('@');
476

    
477
        if (attribute == -1)
478
        {
479
            if (literal != null)
480
            {
481
                sql.append("AND nodeid IN (SELECT parentnodeid FROM xml_nodes WHERE nodetype = 'TEXT' AND nodedata LIKE ")
482
                    .append(literal).append(")");
483
            }
484
        }
485
        else
486
        {
487
            sql.append(
488
                    "AND nodeid IN (SELECT parentnodeid FROM xml_nodes WHERE nodetype = 'ATTRIBUTE' AND nodename LIKE '")
489
                    .append(path.substring(attribute + 1).trim()).append("' ");
490

    
491
            if (literal != null)
492
            {
493
                sql.append("AND nodedata LIKE ").append(literal);
494
            }
495

    
496
            sql.append(")");
497
            path = path.substring(0, attribute).trim();
498

    
499
            if (path.endsWith("/"))
500
                path = path.substring(0, path.length() - 1).trim();
501
            else
502
            {
503
                if (!path.equals(""))
504
                {
505
                    log.warn("predicate2SQL(): ");
506
                    log.warn("    Invalid or unsupported predicate: " + predicate);
507
                    return "";
508
                }
509
            }
510
        }
511

    
512
        while (!path.equals(""))
513
        {
514
            int ndx = path.lastIndexOf('/');
515
            int predicateEnd = -1;
516
            int predicateStart;
517
            String node;
518

    
519
            if (ndx != -1)
520
            {
521
                node = path.substring(ndx + 1).trim();
522
                path = path.substring(0, ndx).trim();
523
            }
524
            else
525
            {
526
                node = path;
527
                path = "";
528
            }
529

    
530
            if (!node.equals(""))
531
                sql.insert(0, "' ").insert(0, node)
532
                    .insert(0, "(SELECT parentnodeid FROM xml_nodes WHERE nodename LIKE '").append(") ");
533
            else if (!path.equals(""))
534
            {
535
                log.warn("predicate2SQL(): ");
536
                log.warn("    Invalid or unsupported predicate: " + predicate);
537
                return "";
538
            }
539

    
540
            if (path.equals(""))
541
            {
542
                sql.insert(0,
543
                        node.equals("") ? "AND rootnodeid IN " : "AND nodeid IN ");
544
            }
545
            else
546
            {
547
                sql.append("AND nodeid IN ");
548
            }
549
        }
550

    
551
        return sql.toString();
552
    }
553

    
554
    /**
555
     * create a String description of the query that this instance represents.
556
     * This should become a way to get the XML serialization of the query.
557
     */
558
    public String toString()
559
    {
560

    
561
        return this.printSQL(true);
562
    }
563
    
564
    /**
565
     * Compare two query terms to see if they have same search value.
566
     * @param term
567
     * @return
568
     */
569
    public boolean hasSameSearchValue(QueryTerm term)
570
    {
571
    	boolean same = false;
572
    	if (term != null)
573
    	{
574
    		String searchValue = term.getValue();
575
    		if (searchValue != null && this.value != null)
576
    		{
577
    			if (searchValue.equalsIgnoreCase(this.value))
578
    			{
579
    				same = true;
580
    			}
581
    		}
582
    	}
583
    	return same;
584
    }
585
}
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