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Eric J. Bowersox
376
src/com/silverwrist/venice/servlets/format/FindData.java
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376
src/com/silverwrist/venice/servlets/format/FindData.java
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/*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at <http://www.mozilla.org/MPL/>.
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is the Venice Web Community System.
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*
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* The Initial Developer of the Original Code is Eric J. Bowersox <erbo@silcom.com>,
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* for Silverwrist Design Studios. Portions created by Eric J. Bowersox are
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* Copyright (C) 2001 Eric J. Bowersox/Silverwrist Design Studios. All Rights Reserved.
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*
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* Contributor(s):
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*/
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package com.silverwrist.venice.servlets.format;
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import java.io.Writer;
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import java.io.IOException;
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import java.util.*;
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import javax.servlet.*;
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import com.silverwrist.util.StringUtil;
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import com.silverwrist.venice.ValidationException;
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import com.silverwrist.venice.core.*;
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public class FindData implements JSPRender, SearchMode
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{
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/*--------------------------------------------------------------------------------
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* Static data members
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*--------------------------------------------------------------------------------
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*/
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// Attribute name for request attribute
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protected static final String ATTR_NAME = "com.silverwrist.venice.content.FindData";
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// The various display categories
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public static final int FD_SIGS = 0;
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public static final int FD_USERS = 1;
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public static final int FD_CATEGORIES = 2;
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// The titles and URLs of the header data
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private static Vector header_titles = null;
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private static Vector header_urls = null;
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/*--------------------------------------------------------------------------------
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* Attributes
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*--------------------------------------------------------------------------------
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*/
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private VeniceEngine engine;
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private UserContext user;
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private int disp;
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private int field = -1;
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private int mode = -1;
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private String term = null;
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private int offset = 0;
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private CategoryDescriptor cat = null;
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private List subcats = null;
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private List results = null;
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private int find_count = -1;
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/*--------------------------------------------------------------------------------
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* Constructor
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*--------------------------------------------------------------------------------
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*/
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public FindData(VeniceEngine engine, UserContext user, int disp)
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{
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this.engine = engine;
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this.user = user;
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this.disp = disp;
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if (header_titles==null)
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{ // construct the title and URL vectors
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header_titles = new Vector();
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header_titles.add("SIGs");
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header_titles.add("Users");
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header_titles.add("Categories");
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header_titles.trimToSize();
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header_urls = new Vector();
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header_urls.add("find?disp=" + String.valueOf(FD_SIGS));
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header_urls.add("find?disp=" + String.valueOf(FD_USERS));
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header_urls.add("find?disp=" + String.valueOf(FD_CATEGORIES));
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header_urls.trimToSize();
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} // end if
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} // end constructor
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/*--------------------------------------------------------------------------------
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* Internal functions
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*--------------------------------------------------------------------------------
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*/
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private static int getParamInt(ServletRequest request, String name, int default_val)
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{
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String str = request.getParameter(name);
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if (str==null)
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return -1;
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try
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{ // parse the integer value
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return Integer.parseInt(str);
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} // end try
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catch (NumberFormatException nfe)
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{ // in case of conversion error, return default
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return default_val;
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} // end catch
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} // end getParamInt
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private static boolean isImageButtonClicked(ServletRequest request, String name)
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{
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String val = request.getParameter(name + ".x");
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return (val!=null);
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} // end isImageButtonClicked
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/*--------------------------------------------------------------------------------
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* External static functions
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*--------------------------------------------------------------------------------
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*/
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public static int getNumChoices()
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{
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return FD_CATEGORIES + 1;
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} // end getNumChoices
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public static FindData retrieve(ServletRequest request)
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{
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return (FindData)(request.getAttribute(ATTR_NAME));
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} // end retrieve
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/*--------------------------------------------------------------------------------
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* Implementations from interface JSPRender
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*--------------------------------------------------------------------------------
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*/
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public void store(ServletRequest request)
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{
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request.setAttribute(ATTR_NAME,this);
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} // end store
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public String getTargetJSPName()
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{
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return "find.jsp";
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} // end getTargetJSPName
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/*--------------------------------------------------------------------------------
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* External operations
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*--------------------------------------------------------------------------------
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*/
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public void writeHeader(RenderData rdat, Writer out) throws IOException
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{
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rdat.writeContentSelectorHeader(out,"Find:",header_titles,header_urls,disp);
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} // end writeHeader
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public int getDisplayOption()
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{
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return disp;
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} // end getDisplayOption
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public int getSearchField()
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{
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return field;
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} // end getSearchField
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public boolean searchFieldIs(int value)
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{
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return (value==field);
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} // end searchFieldIs
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public int getSearchMode()
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{
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return mode;
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} // end getSearchMode
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public boolean searchModeIs(int value)
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{
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return (value==mode);
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} // end searchModeIs
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public String getSearchTerm()
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{
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return term;
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} // end getSearchTerm
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public CategoryDescriptor getCategory()
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{
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return cat;
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} // end getCategory
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public List getSubCategoryList()
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{
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return subcats;
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} // end getSubCategoryList
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public List getResultsList()
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{
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return results;
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} // end getResultsList
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public int getNumResultsDisplayed()
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{
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return engine.getStdNumSearchResults();
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} // end getNumResultsDisplayed
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public int getFindCount()
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{
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return find_count;
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} // end getFindCount
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public int getOffset()
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{
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return offset;
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} // end getOffset
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public void loadGet(int catid) throws DataException
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{
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if (disp==FD_SIGS)
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{ // fill in the list of subcategories and of SIGs in this category
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cat = user.getCategoryDescriptor(catid);
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subcats = cat.getSubCategories();
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if (cat.getCategoryID()>=0)
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{ // fill in the SIGs that are in this category
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results = user.getSIGsInCategory(cat,offset,getNumResultsDisplayed());
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find_count = user.getNumSIGsInCategory(cat);
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} // end if
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field = FIELD_SIG_NAME;
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} // end if
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else if (disp==FD_USERS)
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field = FIELD_USER_NAME;
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mode = SEARCH_PREFIX;
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term = "";
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} // end loadGet
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public void loadPost(ServletRequest request) throws ValidationException, DataException
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{
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int catid = -1;
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// Retrieve all the posted parameters from the form and validate them. First validate the
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// category ID (if specified) and the field identifier.
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switch (disp)
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{
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case FD_SIGS:
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catid = getParamInt(request,"cat",-1);
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if (!engine.isValidCategoryID(catid))
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throw new ValidationException("The category ID parameter is not valid.");
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field = getParamInt(request,"field",FIELD_SIG_NAME);
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if ((field!=FIELD_SIG_NAME) && (field!=FIELD_SIG_SYNOPSIS))
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throw new ValidationException("The field search parameter is not valid.");
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break;
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case FD_USERS:
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field = getParamInt(request,"field",FIELD_USER_NAME);
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if ( (field!=FIELD_USER_NAME) && (field!=FIELD_USER_DESCRIPTION) && (field!=FIELD_USER_GIVEN_NAME)
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&& (field!=FIELD_USER_FAMILY_NAME))
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throw new ValidationException("The field search parameter is not valid.");
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break;
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case FD_CATEGORIES:
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// no parameters to set here - there's no "field" for category search
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break;
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default:
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throw new InternalStateError("loadPost failure - invalid display parameter");
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} // end switch
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// Validate the search mode parameter.
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mode = getParamInt(request,"mode",SEARCH_PREFIX);
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if ((mode!=SEARCH_PREFIX) && (mode!=SEARCH_SUBSTRING) && (mode!=SEARCH_REGEXP))
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throw new ValidationException("The search mode parameter is not valid.");
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// Retrieve the search term parameter.
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term = request.getParameter("term");
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if (term==null)
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term = "";
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// Retrieve the offset and find count parameters.
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offset = getParamInt(request,"ofs",0);
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find_count = getParamInt(request,"fcount",-1);
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// Adjust the search return offset based on the command button click.
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int count = getNumResultsDisplayed();
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if (isImageButtonClicked(request,"search"))
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offset = 0;
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else if (isImageButtonClicked(request,"previous"))
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{ // adjust the offset in the reverse direction
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offset -= count;
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if (offset<0)
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offset = 0;
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} // end else if
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else if (isImageButtonClicked(request,"next"))
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offset += count; // go forwards instead
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else
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throw new ValidationException("Unable to determine what action triggered the form.");
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// Run the actual search.
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switch (disp)
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{
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case FD_SIGS:
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if (catid>=0)
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{ // retrieve the category descriptor and the subcategory list
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cat = user.getCategoryDescriptor(catid);
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subcats = cat.getSubCategories();
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if (cat.getCategoryID()>=0)
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{ // fill in the SIGs that are in this category
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results = user.getSIGsInCategory(cat,offset,count);
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if (find_count<0)
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find_count = user.getNumSIGsInCategory(cat);
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} // end if
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} // end if
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else
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{ // retrieve the SIG search data
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results = user.searchForSIGs(field,mode,term,offset,count);
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if (find_count<0)
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find_count = user.getSearchSIGCount(field,mode,term);
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} // end else
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break;
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case FD_USERS:
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results = engine.searchForUsers(field,mode,term,offset,count);
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if (find_count<0)
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find_count = engine.getSearchUserCount(field,mode,term);
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break;
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case FD_CATEGORIES:
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results = user.searchForCategories(mode,term,offset,count);
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if (find_count<0)
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find_count = user.getSearchCategoryCount(mode,term);
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break;
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} // end switch
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} // end loadPost
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public static String getCatJumpLink(RenderData rdat, int catid)
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{
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return rdat.getEncodedServletPath("find?disp=" + String.valueOf(FD_SIGS) + "&cat="
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+ String.valueOf(catid));
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} // end getCatJumpLink
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} // end class FindData
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