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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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* Release: @release@
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*
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* '$Author: tao $'
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* '$Date: 2003-10-02 17:16:37 -0700 (Thu, 02 Oct 2003) $'
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* '$Revision: 1831 $'
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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 edu.ucsb.nceas.dbadapter.*;
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import java.io.*;
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import java.util.Hashtable;
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import java.util.Stack;
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import java.util.Vector;
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import java.util.Enumeration;
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/** a utility class that represents a group of terms in a query */
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public class QueryGroup {
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private String operator = null; // indicates how query terms are combined
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private Vector children = null; // the list of query terms and groups
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private int countPercentageSearchItem = 0;
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/**
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* construct a new QueryGroup
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*
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* @param operator the boolean conector used to connect query terms
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* in this query group
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*/
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public QueryGroup(String operator) {
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this.operator = operator;
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children = new Vector();
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}
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/**
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* Add a child QueryGroup to this QueryGroup
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*
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* @param qgroup the query group to be added to the list of terms
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*/
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public void addChild(QueryGroup qgroup) {
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children.add((Object)qgroup);
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}
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/**
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* Add a child QueryTerm to this QueryGroup
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*
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* @param qterm the query term to be added to the list of terms
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*/
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public void addChild(QueryTerm qterm) {
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children.add((Object)qterm);
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}
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/**
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* Retrieve an Enumeration of query terms for this QueryGroup
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*/
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public Enumeration getChildren() {
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return children.elements();
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}
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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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* 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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StringBuffer self = new StringBuffer();
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boolean first = true;
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self.append("(");
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Enumeration en= getChildren();
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while (en.hasMoreElements()) {
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Object qobject = en.nextElement();
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if (first) {
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first = false;
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} else {
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self.append(" " + operator + " ");
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}
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if (qobject instanceof QueryGroup) {
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QueryGroup qg = (QueryGroup)qobject;
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self.append(qg.printSQL(useXMLIndex));
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// count percerntage number
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int count = qg.getPercentageSymbolCount();
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countPercentageSearchItem = countPercentageSearchItem + count;
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} else if (qobject instanceof QueryTerm) {
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QueryTerm qt = (QueryTerm)qobject;
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self.append(qt.printSQL(useXMLIndex));
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// count percerntage number
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int count = qt.getPercentageSymbolCount();
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countPercentageSearchItem = countPercentageSearchItem + count;
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} else {
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System.err.println("qobject wrong type: fatal error");
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}
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}
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self.append(") \n");
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return self.toString();
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}
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/**
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* create a String description of the query that this instance represents.
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* This should become a way to get the XML serialization of the query.
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*/
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public String toString() {
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StringBuffer self = new StringBuffer();
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self.append(" (Query group operator=" + operator + "\n");
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Enumeration en= getChildren();
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while (en.hasMoreElements()) {
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Object qobject = en.nextElement();
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self.append(qobject);
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}
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self.append(" )\n");
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return self.toString();
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}
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}
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