mitm.djigzo.web.bindings.JoinBinding.java Source code

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Here is the source code for mitm.djigzo.web.bindings.JoinBinding.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo 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 Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Common Development and 
 * Distribution License (CDDL), Common Public License (CPL) the 
 * licensors of this Program grant you additional permission to 
 * convey the resulting work.
 */
package mitm.djigzo.web.bindings;

import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.Iterator;

import mitm.common.util.Check;

import org.apache.commons.lang.StringUtils;
import org.apache.tapestry5.Binding;
import org.apache.tapestry5.internal.bindings.AbstractBinding;

/**
 * Tapestry binding that Joins collections, object[] etc. using commons-lang StringUtils.join
 * 
 * @author Martijn Brinkers
 *
 */
public class JoinBinding extends AbstractBinding {
    private final static String SEPARATOR = ", ";

    private final Binding delegate;

    public JoinBinding(Binding delegate) {
        Check.notNull(delegate, "delegate");

        this.delegate = delegate;
    }

    @Override
    public Object get() {
        Object value = delegate.get();

        if (value instanceof String) {
            return (String) value;
        } else if (value instanceof Collection) {
            return StringUtils.join((Collection<?>) value, SEPARATOR);
        } else if (value instanceof Object[]) {
            return StringUtils.join((Object[]) value, SEPARATOR);
        } else if (value instanceof Iterator<?>) {
            return StringUtils.join((Iterator<?>) value, SEPARATOR);
        }

        return value;
    }

    @Override
    public boolean isInvariant() {
        return delegate.isInvariant();
    }

    @Override
    public Class<?> getBindingType() {
        return delegate.getBindingType();
    }

    @Override
    public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
        return delegate.getAnnotation(annotationClass);
    }
}