ConstraintsCatalogBuilderFromProperties.java

/*
 * Copyright (c) 2010 Ecole des Mines de Nantes.
 *
 *      This file is part of Entropy.
 *
 *      Entropy is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU Lesser General Public License as published by
 *      the Free Software Foundation, either version 3 of the License, or
 *      (at your option) any later version.
 *
 *      Entropy 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 Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public License
 *      along with Entropy.  If not, see <http://www.gnu.org/licenses/>.
 */

package entropy.vjob.builder;

import entropy.Entropy;
import entropy.MissingRequiredPropertyException;
import entropy.PropertiesHelper;
import entropy.vjob.VJob;

/**
 * Build a ConstraintCatalogBuilder that creates catalog using properties.
 *
 * @author Fabien Hermenier
 */
public final class ConstraintsCatalogBuilderFromProperties implements ConstraintsCatalogBuilder {

    /**
     * The property to define the constraints to add to the catalog.
     */
    public static final String CATALOG_CONTENTS_PROPERTIES = "constraintsCatalog.load";

    /**
     * The prefix of each contraint to load. Indicates the FQCN of the PlacementConstraintBuilder.
     */
    public static final String CONSTRAINT_BUILDER = "constraintsCatalog.location.";

    /**
     * The properties to use.
     */
    private PropertiesHelper props;

    /**
     * Build a new ConstraintsCatalogBuilder using specific properties.
     *
     * @param p the properties to use
     */
    public ConstraintsCatalogBuilderFromProperties(PropertiesHelper p) {
        this.props = p;
    }

    /**
     * Build a catalog.
     *
     * @return the catalog
     * @throws ConstraintsCalalogBuilderException
     *          if an error occurred while creating the catalog.
     */
    @Override
    public ConstraintsCatalog build() throws ConstraintsCalalogBuilderException {
        DefaultConstraintsCatalog c = new DefaultConstraintsCatalog();
        if (props.isDefined(CATALOG_CONTENTS_PROPERTIES)) {
            try {
                String list = props.getRequiredProperty(CATALOG_CONTENTS_PROPERTIES);
                String[] constraints = list.split(",");
                for (String constraint : constraints) {
                    String fqcn = props.getRequiredProperty(CONSTRAINT_BUILDER + constraint);
                    Class cl = getClass().getClassLoader().loadClass(fqcn);
                    //c.add((PlacementConstraintBuilder) cl.getConstructor(VJobBuilder.class, String.class).newInstance(new Object[]{vJobBuilder, constraint}));
                    c.add((PlacementConstraintBuilder) cl.newInstance());
                }
                VJob.logger.debug("Available constraints: " + c.getAvailableConstraints());
            } catch (MissingRequiredPropertyException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalog: " + e.getMessage(), e);
            } catch (ClassNotFoundException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalog: " + e.getMessage(), e);
            } catch (InstantiationException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalog:" + e.getMessage(), e);
            } catch (IllegalAccessException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalog:" + e.getMessage(), e);
            } /*catch (NoSuchMethodException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalogue", e);
            } catch (InvocationTargetException e) {
                throw new ConstraintsCalalogBuilderException("Unable to build the catalogue", e);
            }   */
        } else {
            Entropy.getLogger().info("No constraints to load");
        }
        return c;
    }
}