Formulas.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2020 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.indicator;
 
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.turro.elephant.context.ElephantContext;
import org.turro.file.FileWatch;
 
public class Formulas extends Properties {
 
  /* From classes */
  
  public String getFormula(Class javaClass) {
    return getFormula(javaClass.getSimpleName());
  }
  
  public String getFormula(Class javaClass, String defaultValue) {
    return getFormula(javaClass.getSimpleName(), defaultValue);
  }
  
  public String getFormula(String classContext) {
    return getProperty(classContext);
  }
  
  public String getFormula(String classContext, String defaultValue) {
    return getProperty(classContext, defaultValue);
  }
 
  public void setFormula(String classContext, String value) {
    setProperty(classContext, value);
    store();
  }
  
  /* From classes with attributes */
  
  public String getFormulaAttr(Class javaClass, String attribute) {
    return getFormulaAttr(javaClass.getSimpleName(), attribute);
  }
  
  public String getFormulaAttr(Class javaClass, String attribute, String defaultValue) {
    return getFormulaAttr(javaClass.getSimpleName(), attribute, defaultValue);
  }
  
  public String getFormulaAttr(String classContext, String attribute) {
    return getProperty(createProperty(classContext, attribute));
  }
  
  public String getFormulaAttr(String classContext, String attribute, String defaultValue) {
    return getProperty(createProperty(classContext, attribute), defaultValue);
  }
  
  /* Class formula */
  
  private String createProperty(String classContext, String attribute) {
    return classContext + "#" + attribute;
  }
  
  /* Formula's context */
  
  private static final String formulaFile = "/WEB-INF/elephant/conf/formula-context.properties";
  
  private static Formulas _formulas;
  private static long _lastLoad;
  
  public static Formulas load() {
    boolean exists = FileWatch.exists(ElephantContext.getRealPath(formulaFile));
    if(_formulas == null || FileWatch.isNewer(ElephantContext.getRealPath(formulaFile), _lastLoad) || !exists) {
      if(exists) {
        try(FileInputStream fis = new FileInputStream(ElephantContext.getRealPath(formulaFile))) {
          _formulas = new Formulas();
          _formulas.load(fis);
        } catch (IOException ex) {
          Logger.getLogger(Formulas.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
        }
      } else {
        _formulas = new Formulas();
      }
      _lastLoad = FileWatch.getTime(ElephantContext.getRealPath(formulaFile));
    }
    return _formulas;
  }
 
  private static void store() {
    try(FileOutputStream fos = new FileOutputStream(ElephantContext.getRealPath(formulaFile))) {
      _formulas.store(fos, null);
    } catch (IOException ex) {
      Logger.getLogger(Formulas.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
 
}