/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * DOMUtils.java

 *

 * Created on May 7th 2002

 */

package com.sun.tools.internal.xjc.util;

import java.util.ArrayList;

import javax.xml.namespace.QName;

import org.w3c.dom.DOMException;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

/**

 *

 * @author  Vivek Pandey

 * @version 1.0

 *

 */

public class DOMUtils {

    /** Gets the fist child of the given name, or null. */

    public static Element getFirstChildElement( Element parent, String nsUri, String localPart ) {

        NodeList children = parent.getChildNodes();

        for( int i=0; i<children.getLength(); i++ ) {

            Node item = children.item(i);

            if(!(item instanceof Element ))     continue;

            if(nsUri.equals(item.getNamespaceURI())

            && localPart.equals(item.getLocalName()) )

                return (Element)item;

        }

        return null;

    }

    /** Gets the child elements of the given name. */

    public static Element[] getChildElements(Element parent, String nsUri, String localPart ) {

        ArrayList a = new ArrayList();

        NodeList children = parent.getChildNodes();

        for( int i=0; i<children.getLength(); i++ ) {

            Node item = children.item(i);

            if(!(item instanceof Element ))     continue;

            if(nsUri.equals(item.getNamespaceURI())

            && localPart.equals(item.getLocalName()) )

                a.add(item);

        }

        return (Element[]) a.toArray(new Element[a.size()]);

    }

    /** Gets all the child elements. */

    public static Element[] getChildElements( Element parent ) {

        ArrayList a = new ArrayList();

        NodeList children = parent.getChildNodes();

        for( int i=0; i<children.getLength(); i++ ) {

            Node item = children.item(i);

            if(!(item instanceof Element ))     continue;

            a.add(item);

        }

        return (Element[]) a.toArray(new Element[a.size()]);

    }

  public static String getElementText(Element element) throws DOMException{

    for (Node child = element.getFirstChild(); child != null;

     child = child.getNextSibling()) {

      if(child.getNodeType() == Node.TEXT_NODE)

    return child.getNodeValue();

    }

    return element.getNodeValue();

  }

  public static Element getElement(Document parent, String name){

    NodeList children = parent.getElementsByTagName(name);

    if(children.getLength() >= 1)

      return (Element)children.item(0);

    return null;

  }

  public static Element getElement(Document parent, QName qname){

    NodeList children = parent.getElementsByTagNameNS(qname.getNamespaceURI(), qname.getLocalPart());

    if(children.getLength() >= 1)

      return (Element)children.item(0);

    return null;

  }

  public static Element getElement(Document parent, String namespaceURI,

                       String localName) {

    NodeList children = parent.getElementsByTagNameNS(namespaceURI, localName);

    if(children.getLength() >= 1)

      return (Element)children.item(0);

    return null;

  }

    public static Element[] getElements(NodeList children) {

        Element[] elements = null;

        int len = 0;

        for (int i = 0; i < children.getLength(); ++i) {

            if (elements == null)

                elements = new Element[1];

            if (elements.length == len) {

                Element[] buf = new Element[elements.length + 1];

                System.arraycopy(elements, 0, buf, 0, elements.length);

                elements = buf;

            }

            elements[len++] = (Element)children.item(i);

        }

        return elements;

    }

}