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The XAdES4j library is an high-level, configurable and extensible Java implementation of XML Advanced Electronic Signatures (XAdES 1.3.2 and 1.4.1). It enables producing, verifying and extending signatures in the main XAdES forms: XAdES-BES, XAdES-EPES, XAdES-T and XAdES-C. Also, extended forms are supported through the enrichment of an existing signature.

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/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2010 Luis Goncalves.
 *
 * XAdES4j 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 any later version.
 *
 * XAdES4j 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 XAdES4j. If not, see .
 */
package xades4j.utils;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import xades4j.utils.CollectionUtils.Predicate;

/**
 *
 * @author Luís
 */
public class DataGetterImpl implements DataGetter
{
    private final Collection all;
    private final Map> allByType;

    public DataGetterImpl(Collection all)
    {
        this.all = Collections.unmodifiableCollection(all);
        this.allByType = getAllByType(all);
    }

    private Map> getAllByType(Collection all)
    {
        Map> res = new HashMap>();

        for (T e : all)
        {
            Set typeTs = res.get(e.getClass());
            if (null == typeTs)
            {
                typeTs = new HashSet();
                res.put(e.getClass(), typeTs);
            }
            typeTs.add(e);
        }
        return res;
    }

    @Override
    public Collection getAll()
    {
        return all;
    }

    @Override
    public  Collection getOfType(
            Class clazz)
    {
        return (Collection)CollectionUtils.emptyIfNull(allByType.get(clazz));
    }

    @Override
    public Collection getFiltered(Predicate filter)
    {
        return CollectionUtils.filter(all, filter);
    }
}