com.isotrol.impe3.freemarker.wrap.ModelUtils.java Source code

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Here is the source code for com.isotrol.impe3.freemarker.wrap.ModelUtils.java

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/**
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l 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.
 *
 * Port@l 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 Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.isotrol.impe3.freemarker.wrap;

import static com.google.common.base.Predicates.notNull;
import static com.google.common.collect.Iterables.filter;

import java.net.URI;
import java.util.List;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;

import freemarker.template.SimpleScalar;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateScalarModel;

/**
 * Utility methods for models..
 * @author Andres Rodriguez
 */
final class ModelUtils {
    /** Not instantiable. */
    private ModelUtils() {
        throw new AssertionError();
    }

    static String arg(List<String> args, int i) {
        if (args == null || args.size() <= i) {
            return null;
        }
        return args.get(i);
    }

    static Iterable<String> notNullArgs(List<String> args) {
        if (args == null) {
            return ImmutableList.of();
        }
        return filter(args, notNull());
    }

    static Multimap<String, String> buildURIQueryParameters(List<String> args, int index) {
        if (args == null || (args.size() - index) < 2) {
            return ImmutableMultimap.of();
        }
        final int n = args.size();
        final Multimap<String, String> map = LinkedListMultimap.create(n / 2);
        for (int i = index; (args.size() - i) >= 2; i += 2) {
            String p = args.get(i);
            String v = args.get(i + 1);
            if (p != null && v != null) {
                map.put(p, v);
            }
        }
        return map;
    }

    static TemplateModel uri(URI uri) {
        if (uri == null) {
            return TemplateScalarModel.EMPTY_STRING;
        }
        return new SimpleScalar(uri.toASCIIString());
    }
}