Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright (C) 2014-2017 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.
 */

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import javax.xml.XMLConstants;
import javax.xml.namespace.QName;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.w3c.dom.Node;

public class Main {
    /**
     * Get the QName of the passed element. If the passed element has no namespace
     * URI, only the tag name is used. Otherwise namespace URI, local name and
     * prefix are used.
     *
     * @param aElement
     *        The element to be used. May not be <code>null</code>.
     * @return The created {@link QName}.
     * @since 8.4.1
     */
    @Nonnull
    public static QName getQName(@Nonnull final Element aElement) {
        final String sNamespaceURI = aElement.getNamespaceURI();
        if (sNamespaceURI == null)
            return new QName(aElement.getTagName());
        return new QName(sNamespaceURI, aElement.getLocalName(), getPrefix(aElement));
    }

    @Nullable
    public static String getNamespaceURI(@Nullable final Node aNode) {
        if (aNode instanceof Document) {
            // Recurse into document element
            return getNamespaceURI(((Document) aNode).getDocumentElement());
        }
        if (aNode != null)
            return aNode.getNamespaceURI();
        return null;
    }

    /**
     * Get the namespace prefix of the passed element in a safe way.
     *
     * @param aElement
     *        The element to be queried. May be <code>null</code>.
     * @return {@link XMLConstants#DEFAULT_NS_PREFIX} or the provided prefix.
     *         Never <code>null</code>.
     * @since 8.4.1
     */
    @Nonnull
    public static String getPrefix(@Nullable final Element aElement) {
        final String sPrefix = aElement == null ? null : aElement.getPrefix();
        return sPrefix == null ? XMLConstants.DEFAULT_NS_PREFIX : sPrefix;
    }

    @Nullable
    public static Element getDocumentElement(@Nullable final Node aNode) {
        final Document aDoc = getOwnerDocument(aNode);
        return aDoc == null ? null : aDoc.getDocumentElement();
    }

    /**
     * Get the owner document of the passed node. If the node itself is a
     * document, only a cast is performed.
     *
     * @param aNode
     *        The node to get the document from. May be <code>null</code>.
     * @return <code>null</code> if the passed node was <code>null</code>.
     */
    @Nullable
    public static Document getOwnerDocument(@Nullable final Node aNode) {
        return aNode == null ? null : aNode instanceof Document ? (Document) aNode : aNode.getOwnerDocument();
    }
}