de.smartics.maven.plugin.jboss.modules.parser.ModulesXmlParser.java Source code

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Here is the source code for de.smartics.maven.plugin.jboss.modules.parser.ModulesXmlParser.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.parser;

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

import org.jdom2.Document;
import org.jdom2.JDOMException;
import org.jdom2.input.SAXBuilder;

import de.smartics.maven.plugin.jboss.modules.descriptor.ModulesDescriptor;
import de.smartics.util.lang.Arg;

/**
 * Parses a modules XML document.
 */
public final class ModulesXmlParser {
    // ********************************* Fields *********************************

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

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

    /**
     * Builder of JDOM documents.
     */
    private final SAXBuilder builder;

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

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

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

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

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

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

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

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

    /**
     * Parses the given document from the stream.
     *
     * @param systemId the identifier of the XML document for error handling and
     *          link resolution.
     * @param input the stream to parse the modules XML document.
     * @return the descriptors found in a given document.
     * @throws NullPointerException if {@code input} or {@code systemId} is
     *           <code>null</code>.
     * @throws IllegalArgumentException if {@code systemId} is blank.
     * @throws JDOMException when errors occur in parsing
     * @throws IOException when an I/O error prevents a document from being fully
     *           parsed
     */
    public ModulesDescriptor parse(final String systemId, final InputStream input)
            throws NullPointerException, IllegalArgumentException, JDOMException, IOException {
        final Document document = builder.build(Arg.checkNotNull("input", input),
                Arg.checkNotBlank("systemId", systemId));

        ModulesDescriptor rc = null;
        if (document.getRootElement().getNamespace() == ModulesDescriptorBuilderV2.NS) {
            rc = new ModulesDescriptorBuilderV2(systemId, document).build();
        } else {
            rc = new ModulesDescriptorBuilder(systemId, document).build();
        }
        // System.out.println("Loaded: "+rc+"\n");
        return rc;
    }

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

}