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/**
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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
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* 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: 2008-03-20 17:32:01 -0700 (Thu, 20 Mar 2008) $'
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* '$Revision: 3771 $'
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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
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*/
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package edu.ucsb.nceas.metacat;
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import java.util.Vector;
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import org.apache.log4j.Logger;
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/** a utility class that represents a single term in a query */
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public class QueryTerm
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{
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private static Logger log = Logger.getLogger(QueryTerm.class);
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private boolean casesensitive = false;
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private String searchmode = null;
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private String value = null;
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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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private boolean inUnionGroup = false;
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public static final String CONTAINS = "contains";
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public static final String EQUALS = "equals";
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/**
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* 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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}
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/**
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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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}
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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")) {
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oper = ">";
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nodedataterm = "nodedatanumerical";
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} else if (searchmode.equals("greater-than-equals")) {
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oper = ">=";
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nodedataterm = "nodedatanumerical";
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} else if (searchmode.equals("less-than")) {
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oper = "<";
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nodedataterm = "nodedatanumerical";
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} 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
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.println("NOT expected case. NOT recognized operator: "
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+ searchmode);
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return null;
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}
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try {
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// it is number; numeric comparison
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// but we need to make sure there is no string in node data
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searchexpr = nodedataterm + " " + oper + " "
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+ new Double(casevalue) + " ";
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} catch (NumberFormatException nfe) {
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// these are characters; character comparison
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searchexpr = nodedataterm + " " + oper + " '" + casevalue
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+ "' ";
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}
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}
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// to check xml_path_index can be used
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boolean usePathIndex = false;
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// if pathexpr has been specified in metacat.properties for indexing
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if(pathexpr != null){
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if(MetaCatUtil.pathsForIndexing.contains(pathexpr)){
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usePathIndex = true;
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}
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}
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if(usePathIndex){
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// using xml_path_index table.....
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if(notEqual == true ){
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if (!inUnionGroup)
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{
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self.append("SELECT DISTINCT docid from xml_path_index WHERE");
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self.append(" docid NOT IN (Select docid FROM xml_path_index WHERE ");
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self.append(searchexpr);
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self.append("AND path LIKE '" + pathexpr + "') ");
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}
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else
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{
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//if this is in union group we need to use "OR" to modify query
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self.append("("+searchexpr);
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self.append("AND path LIKE '" + pathexpr + "') ");
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}
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} else {
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if (!inUnionGroup)
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{
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self.append("SELECT DISTINCT docid FROM xml_path_index WHERE ");
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self.append(searchexpr);
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self.append("AND path LIKE '" + pathexpr + "' ");
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}
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else
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{
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//if this is in union group we need to use "OR" to modify query
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self.append("("+searchexpr);
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self.append("AND path LIKE '" + pathexpr + "') ");
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}
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}
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} else {
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// using xml_nodes and xml_index tables
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if(notEqual == true){
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self.append("SELECT DISTINCT docid from xml_nodes WHERE");
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self.append(" docid NOT IN (Select docid FROM xml_nodes WHERE ");
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} else {
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self.append("(SELECT DISTINCT docid FROM xml_nodes WHERE ");
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}
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self.append(searchexpr);
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if (pathexpr != null) {
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// use XML Index
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if (useXMLIndex) {
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if (!hasAttributeInPath(pathexpr)) {
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// without attributes in path
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self.append("AND parentnodeid IN ");
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} else {
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// has a attribute in path
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String attributeName = QuerySpecification
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.getAttributeName(pathexpr);
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self.append(
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"AND nodetype LIKE 'ATTRIBUTE' AND nodename LIKE '"
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+ attributeName + "' ");
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// and the path expression includes element content other than
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// just './' or '../'
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if ( (!pathexpr.startsWith(QuerySpecification.
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ATTRIBUTESYMBOL)) &&
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(!pathexpr.startsWith("./" +
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QuerySpecification.ATTRIBUTESYMBOL)) &&
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(!pathexpr.startsWith("../" +
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QuerySpecification.ATTRIBUTESYMBOL))) {
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self.append("AND parentnodeid IN ");
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pathexpr = QuerySpecification
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.newPathExpressionWithOutAttribute(pathexpr);
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}
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}
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self.append(
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"(SELECT nodeid FROM xml_index WHERE path LIKE "
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+ "'" + pathexpr + "') ");
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}
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else {
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// without using XML Index; using nested statements instead
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//self.append("AND parentnodeid IN ");
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self.append("AND ");
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self.append(useNestedStatements(pathexpr));
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}
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}
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else if ( (value.trim()).equals("%")) {
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//if pathexpr is null and search value is %, is a
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// percentageSearchItem
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// the count number will be increase one
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countPercentageSearchItem++;
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}
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self.append(") ");
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}
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return self.toString();
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}
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/** A method to judge if a path have attribute */
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private boolean hasAttributeInPath(String path)
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{
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if (path.indexOf(QuerySpecification.ATTRIBUTESYMBOL) != -1) {
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return true;
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} else {
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return false;
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}
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}
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333
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334
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public static String useNestedStatements(String pathexpr)
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{
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log.info("useNestedStatements()");
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log.info("pathexpr: " + pathexpr);
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String elementPrefix = " parentnodeid IN ";
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String attributePrefix = " nodeid IN ";
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boolean lastOneIsAttribute = false;
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StringBuffer nestedStmts = new StringBuffer();
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String path = pathexpr.trim();
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String sql = "";
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if (path.indexOf('/') == 0)
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{
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nestedStmts.append("AND parentnodeid = rootnodeid ");
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path = path.substring(1).trim();
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}
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do
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{
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int inx = path.indexOf('/');
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int predicateStart = -1;
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int predicateEnd;
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String node;
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Vector predicates = new Vector();
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359
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// extract predicates
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predicateStart = path.indexOf(QuerySpecification.PREDICATE_START, predicateStart + 1);
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362
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// any predicates in this node?
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if (inx != -1 && (predicateStart == -1 || predicateStart > inx))
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{
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// no
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node = path.substring(0, inx).trim();
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path = path.substring(inx + 1).trim();
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}
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else if (predicateStart == -1)
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{
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// no and it's the last node
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node = path;
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if (node != null && node.indexOf(QuerySpecification.ATTRIBUTESYMBOL) != -1)
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{
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lastOneIsAttribute = true;
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node = removeAttributeSymbol(node);
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}
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path = "";
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}
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else
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{
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// yes
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node = path.substring(0, predicateStart).trim();
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385
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path = path.substring(predicateStart);
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386
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predicateStart = 0;
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387
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388
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while (predicateStart == 0)
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389
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{
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predicateEnd = path.indexOf(QuerySpecification.PREDICATE_END,
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predicateStart);
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392
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393
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if (predicateEnd == -1)
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394
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{
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395
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log.warn("useNestedStatements(): ");
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396
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log.warn(" Invalid path: " + pathexpr);
|
|
397
|
return "";
|
|
398
|
}
|
|
399
|
|
|
400
|
predicates.add(path.substring(1, predicateEnd).trim());
|
|
401
|
path = path.substring(predicateEnd + 1).trim();
|
|
402
|
inx = path.indexOf('/');
|
|
403
|
predicateStart = path.indexOf(QuerySpecification.PREDICATE_START);
|
|
404
|
}
|
|
405
|
|
|
406
|
if (inx == 0)
|
|
407
|
path = path.substring(1).trim();
|
|
408
|
else if (!path.equals(""))
|
|
409
|
{
|
|
410
|
log.warn("useNestedStatements(): ");
|
|
411
|
log.warn(" Invalid path: " + pathexpr);
|
|
412
|
return "";
|
|
413
|
}
|
|
414
|
}
|
|
415
|
|
|
416
|
nestedStmts.insert(0, "' ").insert(0, node).insert(0,
|
|
417
|
"(SELECT nodeid FROM xml_nodes WHERE nodename LIKE '");
|
|
418
|
|
|
419
|
// for the last statement: it is without " AND parentnodeid IN "
|
|
420
|
if (!path.equals(""))
|
|
421
|
nestedStmts.insert(0, "AND parentnodeid IN ");
|
|
422
|
|
|
423
|
if (predicates.size() > 0)
|
|
424
|
{
|
|
425
|
for (int n = 0; n < predicates.size(); n++)
|
|
426
|
{
|
|
427
|
String predSQL = predicate2SQL((String) predicates.get(n));
|
|
428
|
|
|
429
|
if (predSQL.equals(""))
|
|
430
|
return "";
|
|
431
|
|
|
432
|
nestedStmts.append(predSQL).append(' ');
|
|
433
|
}
|
|
434
|
}
|
|
435
|
|
|
436
|
nestedStmts.append(") ");
|
|
437
|
}
|
|
438
|
while (!path.equals(""));
|
|
439
|
if (lastOneIsAttribute)
|
|
440
|
{
|
|
441
|
sql = attributePrefix+nestedStmts.toString();
|
|
442
|
}
|
|
443
|
else
|
|
444
|
{
|
|
445
|
sql = elementPrefix+nestedStmts.toString();
|
|
446
|
}
|
|
447
|
return sql;
|
|
448
|
}
|
|
449
|
|
|
450
|
|
|
451
|
/*
|
|
452
|
* Removes @ symbol from path. For example, if path is @entity, entity will be returned.
|
|
453
|
* If path is entity, entity will be returned.
|
|
454
|
*/
|
|
455
|
private static String removeAttributeSymbol(String path)
|
|
456
|
{
|
|
457
|
String newPath ="";
|
|
458
|
log.debug("Original string before removing @ is " + path);
|
|
459
|
if (path != null)
|
|
460
|
{
|
|
461
|
|
|
462
|
int attribute = path.indexOf(QuerySpecification.ATTRIBUTESYMBOL);
|
|
463
|
if (attribute != -1)
|
|
464
|
{
|
|
465
|
// has attribute symbol. Reomve it and return the remained part.
|
|
466
|
try
|
|
467
|
{
|
|
468
|
newPath = path.substring(attribute + 1).trim();
|
|
469
|
}
|
|
470
|
catch (Exception e)
|
|
471
|
{
|
|
472
|
newPath = path;
|
|
473
|
}
|
|
474
|
}
|
|
475
|
else
|
|
476
|
{
|
|
477
|
// doesn't have attribute symbol. Return original string
|
|
478
|
newPath = path;
|
|
479
|
}
|
|
480
|
}
|
|
481
|
else
|
|
482
|
{
|
|
483
|
// if is null, return null;
|
|
484
|
newPath = path;
|
|
485
|
}
|
|
486
|
log.debug("String after removing @ is " + newPath);
|
|
487
|
return newPath;
|
|
488
|
|
|
489
|
}
|
|
490
|
|
|
491
|
/**
|
|
492
|
*
|
|
493
|
*/
|
|
494
|
public static String predicate2SQL(String predicate)
|
|
495
|
{
|
|
496
|
String path = predicate.trim();
|
|
497
|
int equals = path.indexOf('=');
|
|
498
|
String literal = null;
|
|
499
|
|
|
500
|
if (equals != -1)
|
|
501
|
{
|
|
502
|
literal = path.substring(equals + 1).trim();
|
|
503
|
path = path.substring(0, equals).trim();
|
|
504
|
int sQuote = literal.indexOf('\'');
|
|
505
|
int dQuote = literal.indexOf('"');
|
|
506
|
|
|
507
|
if (sQuote == -1 && dQuote == -1)
|
|
508
|
{
|
|
509
|
log.warn("predicate2SQL(): ");
|
|
510
|
log.warn(" Invalid or unsupported predicate: " + predicate);
|
|
511
|
return "";
|
|
512
|
}
|
|
513
|
|
|
514
|
if (sQuote == -1 &&
|
|
515
|
(dQuote != 0 ||
|
|
516
|
literal.indexOf('"', dQuote + 1) != literal.length() - 1))
|
|
517
|
{
|
|
518
|
log.warn("predicate2SQL(): ");
|
|
519
|
log.warn(" Invalid or unsupported predicate: " + predicate);
|
|
520
|
return "";
|
|
521
|
}
|
|
522
|
|
|
523
|
if (sQuote != 0 ||
|
|
524
|
literal.indexOf('\'', sQuote + 1) != literal.length() - 1)
|
|
525
|
{
|
|
526
|
log.warn("predicate2SQL(): ");
|
|
527
|
log.warn(" Invalid or unsupported predicate: " + predicate);
|
|
528
|
return "";
|
|
529
|
}
|
|
530
|
}
|
|
531
|
|
|
532
|
StringBuffer sql = new StringBuffer();
|
|
533
|
int attribute = path.indexOf('@');
|
|
534
|
|
|
535
|
if (attribute == -1)
|
|
536
|
{
|
|
537
|
if (literal != null)
|
|
538
|
{
|
|
539
|
sql.append("AND nodeid IN (SELECT parentnodeid FROM xml_nodes WHERE nodetype = 'TEXT' AND nodedata LIKE ")
|
|
540
|
.append(literal).append(")");
|
|
541
|
}
|
|
542
|
}
|
|
543
|
else
|
|
544
|
{
|
|
545
|
sql.append(
|
|
546
|
"AND nodeid IN (SELECT parentnodeid FROM xml_nodes WHERE nodetype = 'ATTRIBUTE' AND nodename LIKE '")
|
|
547
|
.append(path.substring(attribute + 1).trim()).append("' ");
|
|
548
|
|
|
549
|
if (literal != null)
|
|
550
|
{
|
|
551
|
sql.append("AND nodedata LIKE ").append(literal);
|
|
552
|
}
|
|
553
|
|
|
554
|
sql.append(")");
|
|
555
|
path = path.substring(0, attribute).trim();
|
|
556
|
|
|
557
|
if (path.endsWith("/"))
|
|
558
|
path = path.substring(0, path.length() - 1).trim();
|
|
559
|
else
|
|
560
|
{
|
|
561
|
if (!path.equals(""))
|
|
562
|
{
|
|
563
|
log.warn("predicate2SQL(): ");
|
|
564
|
log.warn(" Invalid or unsupported predicate: " + predicate);
|
|
565
|
return "";
|
|
566
|
}
|
|
567
|
}
|
|
568
|
}
|
|
569
|
|
|
570
|
while (!path.equals(""))
|
|
571
|
{
|
|
572
|
int ndx = path.lastIndexOf('/');
|
|
573
|
int predicateEnd = -1;
|
|
574
|
int predicateStart;
|
|
575
|
String node;
|
|
576
|
|
|
577
|
if (ndx != -1)
|
|
578
|
{
|
|
579
|
node = path.substring(ndx + 1).trim();
|
|
580
|
path = path.substring(0, ndx).trim();
|
|
581
|
}
|
|
582
|
else
|
|
583
|
{
|
|
584
|
node = path;
|
|
585
|
path = "";
|
|
586
|
}
|
|
587
|
|
|
588
|
if (!node.equals(""))
|
|
589
|
sql.insert(0, "' ").insert(0, node)
|
|
590
|
.insert(0, "(SELECT parentnodeid FROM xml_nodes WHERE nodename LIKE '").append(") ");
|
|
591
|
else if (!path.equals(""))
|
|
592
|
{
|
|
593
|
log.warn("predicate2SQL(): ");
|
|
594
|
log.warn(" Invalid or unsupported predicate: " + predicate);
|
|
595
|
return "";
|
|
596
|
}
|
|
597
|
|
|
598
|
if (path.equals(""))
|
|
599
|
{
|
|
600
|
sql.insert(0,
|
|
601
|
node.equals("") ? "AND rootnodeid IN " : "AND nodeid IN ");
|
|
602
|
}
|
|
603
|
else
|
|
604
|
{
|
|
605
|
sql.append("AND nodeid IN ");
|
|
606
|
}
|
|
607
|
}
|
|
608
|
|
|
609
|
return sql.toString();
|
|
610
|
}
|
|
611
|
|
|
612
|
/**
|
|
613
|
* create a String description of the query that this instance represents.
|
|
614
|
* This should become a way to get the XML serialization of the query.
|
|
615
|
*/
|
|
616
|
public String toString()
|
|
617
|
{
|
|
618
|
|
|
619
|
return this.printSQL(true);
|
|
620
|
}
|
|
621
|
|
|
622
|
/**
|
|
623
|
* Compare two query terms to see if they have same search value.
|
|
624
|
* @param term
|
|
625
|
* @return
|
|
626
|
*/
|
|
627
|
public boolean hasSameSearchValue(QueryTerm term)
|
|
628
|
{
|
|
629
|
boolean same = false;
|
|
630
|
if (term != null)
|
|
631
|
{
|
|
632
|
String searchValue = term.getValue();
|
|
633
|
if (searchValue != null && this.value != null)
|
|
634
|
{
|
|
635
|
if (searchValue.equalsIgnoreCase(this.value))
|
|
636
|
{
|
|
637
|
same = true;
|
|
638
|
}
|
|
639
|
}
|
|
640
|
}
|
|
641
|
return same;
|
|
642
|
}
|
|
643
|
}
|