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/**
 * This file is part of PaxmlCore.
 *
 * PaxmlCore is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PaxmlCore 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with PaxmlCore.  If not, see .
 */
package org.paxml.util;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;

import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMDocument;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.om.OMText;
import org.apache.axiom.om.OMXMLBuilderFactory;
import org.apache.axiom.om.OMXMLParserWrapper;
import org.apache.axiom.om.util.StAXParserConfiguration;
import org.apache.axiom.util.stax.dialect.StAXDialect;

/**
 * The axiom utils.
 * 
 * @author Xuetao Niu
 * 
 */
public final class AxiomUtils {

	/**
	 * Parse input stream to get document.
	 * 
	 * @param in
	 *            input stream
	 * @return the document
	 */
	public static OMDocument getDocument(final InputStream in) {

		// create the builder
		OMXMLParserWrapper builder = OMXMLBuilderFactory.createOMBuilder(new StAXParserConfiguration() {

			@Override
			public XMLInputFactory configure(XMLInputFactory factory, StAXDialect dialect) {
				return factory;
			}

		}, in);

		// get the root element
		OMDocument doc = builder.getDocument();

		return doc;

	}

	/**
	 * Parse input stream to get root element.
	 * 
	 * @param in
	 *            the input stream
	 * @return the root element
	 */
	public static OMElement getRootElement(InputStream in) {

		return getDocument(in).getOMDocumentElement();

	}

	/**
	 * Get attribute value with local name.
	 * 
	 * @param ele
	 *            the element
	 * @param name
	 *            the attribute local name.
	 * @return the attribute value
	 */
	public static String getAttribute(OMElement ele, String name) {

		return ele.getAttributeValue(new QName(name));
	}

	/**
	 * Create text node.
	 * 
	 * @param text
	 *            the text
	 * @return the text node
	 */
	public static OMText createTextNode(String text) {
		return AxiomUtils.getOMFactory().createOMText(text);
	}

	/**
	 * Get attributes as list. This will force the attributes to be parsed.
	 * 
	 * @param ele
	 *            the owning element
	 * @return the list, never null.
	 */
	public static List getAttributes(OMElement ele) {
		List list = new ArrayList();
		for (OMAttribute attr : new Attributes(ele)) {
			list.add(attr);
		}
		return list;
	}

	/**
	 * Get the factory.
	 * 
	 * @return factory
	 */
	public static OMFactory getOMFactory() {
		return OMAbstractFactory.getOMFactory();
	}

	/**
	 * Create a new empty document.
	 * 
	 * @return the doc
	 */
	public static OMDocument newDocument() {
		return getOMFactory().createOMDocument();
	}

	/**
	 * Create a new empty document with root tag.
	 * 
	 * @param rootTagName
	 *            the root tag name
	 * @return the doc
	 */
	public static OMElement newDocument(String rootTagName) {
		return newDocument(rootTagName, "", null);
	}

	/**
	 * Create a new empty document with root tag and namespace.
	 * 
	 * @param rootTagName
	 *            the root tag
	 * @param namespaceURI
	 *            the namespace
	 * @param prefix
	 *            the prefix of namespace
	 * @return the doc
	 */
	public static OMElement newDocument(String rootTagName, String namespaceURI, String prefix) {
		OMDocument doc = newDocument();
		OMElement root = getOMFactory().createOMElement(rootTagName, namespaceURI, prefix);
		doc.setOMDocumentElement(root);
		return root;
	}

	/**
	 * Get all children nodes of an element into a list. This will force the
	 * children be parsed.
	 * 
	 * @param ele
	 *            the element
	 * @return the list, never null.
	 */
	public static List getNodes(OMElement ele) {
		List list = new ArrayList();
		for (OMNode child : new Nodes(ele)) {
			list.add(child);
		}
		return list;
	}

	/**
	 * Get all children elements into a list. This will force the children be
	 * parsed.
	 * 
	 * @param ele
	 *            the owning element
	 * @param filter
	 *            the local name filter
	 * @return the list, never null
	 */
	public static List getElements(OMElement ele, String filter) {
		List list = new ArrayList();
		for (OMElement child : new Elements(ele, filter)) {
			list.add(child);
		}
		return list;
	}

	/**
	 * Get the 1st child element with name filter.
	 * 
	 * @param ele
	 *            the owning element
	 * @param filter
	 *            the local name filter
	 * @return the 1st child element matchig the local name, or null if not
	 *         found.
	 */
	public static OMElement getFirstChildElement(OMElement ele, String filter) {
		if (null == filter) {
			return ele.getFirstElement();
		}
		Iterator it = ele.getChildrenWithLocalName(filter);
		if (it.hasNext()) {
			return it.next();
		} else {
			return null;
		}
	}
}