de.symeda.sormas.ui.utils.CollectionValueProvider.java Source code

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Here is the source code for de.symeda.sormas.ui.utils.CollectionValueProvider.java

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/*******************************************************************************
 * SORMAS - Surveillance Outbreak Response Management & Analysis System
 * Copyright  2016-2018 Helmholtz-Zentrum fr Infektionsforschung GmbH (HZI)
 *
 * 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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *******************************************************************************/
package de.symeda.sormas.ui.utils;

import java.util.Collection;

import com.vaadin.data.ValueProvider;

/**
 * A ValueProvider that allows displaying a collection as a comma separated list of
 * strings.
 */
@SuppressWarnings({ "serial", "rawtypes" })
public class CollectionValueProvider<T extends Collection> implements ValueProvider<T, String> {

    @Override
    public String apply(T source) {
        if (source == null)
            return "";
        StringBuilder b = new StringBuilder();
        for (Object o : source) {
            b.append(o.toString());
            b.append(", ");
        }
        if (b.length() >= 2) {
            return b.substring(0, b.length() - 2);
        }
        return "";
    }

}