de.smartics.maven.plugin.jboss.modules.xml.XmlFragmentParser.java Source code

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Here is the source code for de.smartics.maven.plugin.jboss.modules.xml.XmlFragmentParser.java

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/*
 * Copyright 2013-2015 smartics, Kronseder & Reiner GmbH
 *
 * 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 de.smartics.maven.plugin.jboss.modules.xml;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;

/**
 * Helper to parse XML fragments to be added to the main document.
 */
final class XmlFragmentParser {
    // ********************************* Fields *********************************

    // --- constants ------------------------------------------------------------

    // --- members --------------------------------------------------------------

    /**
     * The document builder.
     */
    private final SAXBuilder builder;

    // ****************************** Initializer *******************************

    // ****************************** Constructors ******************************

    /**
     * Default constructor.
     */
    public XmlFragmentParser() {
        builder = new SAXBuilder();
    }

    // ****************************** Inner Classes *****************************

    // ********************************* Methods ********************************

    // --- init -----------------------------------------------------------------

    // --- get&set --------------------------------------------------------------

    // --- business -------------------------------------------------------------

    /**
     * Parses the given XML fragment.
     *
     * @param xmlFragment the fragment to be parsed in UTF-8 encoding.
     * @return the parsed root element.
     * @throws IllegalArgumentException on any parsing problem.
     */
    public Element parse(final String xmlFragment) throws IllegalArgumentException {
        try {
            final InputStream input = IOUtils.toInputStream(xmlFragment, "UTF-8");
            final Document document = builder.build(input);
            final Element root = document.getRootElement();
            return root.detach();
        } catch (final IOException e) {
            throw new IllegalStateException("UTF-8 encoding not supported on this platform.");
        } catch (final JDOMException e) {
            throw new IllegalArgumentException("Cannot parse XML fragment: " + xmlFragment, e);
        }
    }

    // --- object basics --------------------------------------------------------

}