com.iorga.webappwatcher.util.InstanceSetParameterHandler.java Source code

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Here is the source code for com.iorga.webappwatcher.util.InstanceSetParameterHandler.java

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/*
 * Copyright (C) 2013 Iorga Group
 *
 * This program 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.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/].
 */
package com.iorga.webappwatcher.util;

import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Sets;

public class InstanceSetParameterHandler<T, I> extends BasicParameterHandler<T, Set<I>> {

    private final static Logger log = LoggerFactory.getLogger(InstanceSetParameterHandler.class);

    private final Map<Class<?>, Object> parameterscontext;

    public InstanceSetParameterHandler(final Class<T> ownerClass, final String fieldName,
            final Map<Class<?>, Object> parameterscontext) {
        super(ownerClass, fieldName);
        this.parameterscontext = parameterscontext;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Set<I> convertFromString(final String value) {
        final Set<I> instances = Sets.newHashSet();
        final String[] includes = value.split(",");
        for (final String className : includes) {
            if (StringUtils.isNotBlank(className)) {
                try {
                    instances.add((I) parameterscontext.get(Class.forName(className)));
                } catch (final ClassNotFoundException e) {
                    log.warn("Can't get instance of " + className, e);
                }
            }
        }
        return instances;
    }

    @Override
    protected String convertToString(final Set<I> value) {
        if (value == null) {
            return "";
        }
        final StringBuilder stringBuilder = new StringBuilder();
        boolean first = true;
        for (final I instance : value) {
            if (!first) {
                stringBuilder.append(',');
            } else {
                first = false;
            }
            stringBuilder.append(instance.getClass().getName());
        }
        return stringBuilder.toString();
    }

    @Override
    public boolean isFieldSetIfBlank() {
        return true;
    }
}