source: trunk/gsdl3/src/java/org/greenstone/gsdl3/util/GS2MacroResolver.java@ 11264

/*
 *    GS2MacroResolver.java
 *    Copyright (C) 2005 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.util;

import java.util.ArrayList;

public class GS2MacroResolver 
    extends MacroResolver 
{

    protected GDBMWrapper gdbm_src = null;
    
    // need to make it not add macros if they are already present
    public GS2MacroResolver(GDBMWrapper gdbm) {
    super();
    gdbm_src = gdbm;
    }

    
    public String resolve(String text, String lang, String scope, 
              String doc_oid) {
    if (text == null || text.equals("")) return text;
    if (scope.equals(SCOPE_TEXT) && text_macros.size()==0) return text;
    if (scope.equals(SCOPE_META) && metadata_macros.size() ==0) return text;
    DBInfo node_info = null;
    DBInfo root_info = null;
    boolean new_lang = false;
    if (this.lang == null || !this.lang.equals(lang) ) {
        new_lang = true;
        this.lang = lang;
    } 

    ArrayList macros;
    if (scope.equals(SCOPE_TEXT)) {
        macros = text_macros;
    } else {
        macros = metadata_macros;
    }
    for (int i=0; i<macros.size(); i++) {
        String new_text = null;
        Macro m = (Macro)macros.get(i);
        switch (m.type) {
        case TYPE_DICT:
        if (m.text==null || new_lang) {
            Dictionary dict = new Dictionary(m.bundle, lang);
            m.text = dict.get(m.key, null);
        }
        // we assume that dictionary entries will contain no macros
        // otherwise we can't cache the answer because it might be 
        // document specific
        text = text.replaceAll(m.macro, m.text);
        break;
        case TYPE_TEXT:
        // make sure we resolve any macros in the text
        // the (?s) treats the string as a single line, cos . 
        // doesn't necessarily match line breaks
        if (text.matches("(?s).*"+m.macro+".*")) {
            if (m.resolve) {
            new_text = this.resolve(m.text, lang, scope, doc_oid);
            } else {
            new_text = m.text;
            }
            text = text.replaceAll(m.macro, new_text);
        }
        break;
        case TYPE_META:
        if (text.matches(".*"+m.macro+".*")) {
            if (node_info == null) {
            node_info = gdbm_src.getInfo(doc_oid);
            if (node_info == null) {
                break;
            }
            }
            new_text = node_info.getInfo(m.text);
            if (new_text == null || new_text.equals("")) {
            // try the root node
            if (root_info == null && !OID.isTop(doc_oid)) {
                root_info = gdbm_src.getInfo(OID.getTop(doc_oid));
            }
            if (root_info == null) break;
            new_text = root_info.getInfo(m.text);
            }
            if (new_text != null) {
            if (m.resolve) {
                new_text = this.resolve(new_text, lang, scope, doc_oid);
            }
            text = text.replaceAll(m.macro, new_text);
            }
            
        }
        
        break;
        } // switch
       
    }
    return text;
    
    }

}