com.isotrol.impe3.core.impl.AbstractMultiStringParameters.java Source code

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Here is the source code for com.isotrol.impe3.core.impl.AbstractMultiStringParameters.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.core.impl;

import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sf.derquinsej.CaseIgnoringString;

import com.google.common.base.Functions;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.Iterators;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimap;
import com.isotrol.impe3.api.MultiStringParameters;

/**
 * Skeletal implementation for map-based parameters.
 * @author Andres Rodriguez
 * @author Emilio Escobar
 */
abstract class AbstractMultiStringParameters extends AbstractParameters<List<String>>
        implements MultiStringParameters {
    AbstractMultiStringParameters() {
    }

    abstract ListMultimap<CaseIgnoringString, String> map();

    final ListMultimap<CaseIgnoringString, String> submap(Set<String> included) {
        if (included == null || included.isEmpty()) {
            return ImmutableListMultimap.of();
        }
        final ImmutableListMultimap.Builder<CaseIgnoringString, String> builder = ImmutableListMultimap.builder();
        for (Map.Entry<CaseIgnoringString, Collection<String>> entry : map().asMap().entrySet()) {
            if (included.contains(entry.getKey())) {
                builder.putAll(entry.getKey(), entry.getValue());
            }
        }
        return builder.build();
    }

    public Set<String> getNames() {
        final Set<CaseIgnoringString> keys = map().keySet();
        return new AbstractSet<String>() {

            public boolean add(String e) {
                throw new UnsupportedOperationException();
            }

            public void clear() {
                throw new UnsupportedOperationException();
            }

            public boolean contains(Object o) {
                Preconditions.checkNotNull(o);
                return keys.contains(CaseIgnoringString.valueOf((String) o));
            }

            public boolean isEmpty() {
                return keys.isEmpty();
            }

            public Iterator<String> iterator() {
                return Iterators.transform(keys.iterator(), Functions.toStringFunction());
            }

            public boolean remove(Object o) {
                throw new UnsupportedOperationException();
            }

            public boolean removeAll(Collection<?> c) {
                throw new UnsupportedOperationException();
            }

            public boolean retainAll(Collection<?> c) {
                throw new UnsupportedOperationException();
            }

            public int size() {
                return keys.size();
            }
        };
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.isotrol.impe3.api.Parameters#get(java.lang.String)
     */
    public List<String> get(String name) {
        return map().get(CaseIgnoringString.valueOf(name));
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.isotrol.impe3.api.MultiStringParameters#getFirst(java.lang.String)
     */
    public String getFirst(String name) {
        final List<String> values = get(name);
        if (values.isEmpty()) {
            return null;
        }
        return values.get(0);
    }

    @Override
    public boolean contains(String name) {
        return map().containsKey(CaseIgnoringString.valueOf(name));
    }

    /**
     * Skeletal Immutable implementation.
     * @author Andres Rodriguez
     */
    abstract static class AbstractImmutable extends AbstractMultiStringParameters {
        private final ImmutableListMultimap<CaseIgnoringString, String> map;

        AbstractImmutable(Multimap<CaseIgnoringString, String> map) {
            this.map = ImmutableListMultimap.copyOf(map);
        }

        @Override
        ListMultimap<CaseIgnoringString, String> map() {
            return map;
        }
    }

}