org.sitemap4j.dom4j.Dom4jHelper.java Source code

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Here is the source code for org.sitemap4j.dom4j.Dom4jHelper.java

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/*
 * Copyright (C) 2012 Nicolas A. Brard-Nault
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.sitemap4j.dom4j;

import java.io.InputStream;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.sitemap4j.reader.RawSiteMap;

import com.google.common.base.Function;
import com.google.common.base.Optional;

abstract class Dom4jHelper {
    static Document getDocumentFromInputStream(final InputStream stream) throws UnableToParseStreamException {
        final SAXReader reader = new SAXReader();
        final Document document;
        try {
            document = reader.read(stream);
        } catch (final DocumentException e) {
            throw new UnableToParseStreamException(e);
        }

        return document;
    }

    static Function<InputStream, Document> representationFunction() {
        return new Function<InputStream, Document>() {
            @Override
            public Document apply(final InputStream input) {
                try {
                    return getDocumentFromInputStream(input);
                } catch (UnableToParseStreamException e) {
                    throw new RuntimeException(e);
                }
            }
        };
    }

    static Document getDocumentFromRawSiteMap(final RawSiteMap rawSiteMap) {
        if (!rawSiteMap.hasRepresentation(Document.class)) {
            rawSiteMap.addRepresentation(representationFunction(), Optional.of(Document.class));
        }

        return rawSiteMap.getRepresentation(Document.class).get();
    }

    private Dom4jHelper() {
    }
}