Java XML Element Root getRootElementFromString(String payload)

Description

get Root Element From String

License

Apache License

Declaration

public static Element getRootElementFromString(String payload)
            throws ParserConfigurationException, SAXException, IOException 

Method Source Code

//package com.java2s;
/*//from  ww w.j a v a 2  s . c  o m
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Main {
    public static Element getRootElementFromString(String payload)
            throws ParserConfigurationException, SAXException, IOException {

        return getDocument(payload).getDocumentElement();
    }

    public static Document getDocument(String payload)
            throws ParserConfigurationException, SAXException, IOException {
        if (payload == null || payload.length() < 1)
            return null;

        StringReader sr = new StringReader(payload);
        InputSource source = new InputSource(sr);

        return getDocument(source, null);
    }

    public static Document getDocument(InputSource xml, InputStream xsd)
            throws ParserConfigurationException, SAXException, IOException {
        Document doc = null;

        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            if (xsd != null) {
                dbf.setNamespaceAware(true);
            }

            DocumentBuilder builder = dbf.newDocumentBuilder();
            doc = builder.parse(xml);

            if (xsd != null)
                validateXml(doc, xsd);
        } finally {
            closeStream(xml.getByteStream());
        }

        return doc;
    }

    public static void validateXml(InputStream xml, InputStream xsd)
            throws SAXException, IOException, ParserConfigurationException {
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            dbf.setNamespaceAware(true);
            Document doc = dbf.newDocumentBuilder().parse(xml);
            validateXml(doc, xsd);
        } finally {
            closeStream(xml);
            closeStream(xsd);
        }
    }

    public static void validateXml(Node root, InputStream xsd) throws SAXException, IOException {
        try {
            Source source = new StreamSource(xsd);
            Schema schema = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI).newSchema(source);

            Validator validator = schema.newValidator();
            validator.validate(new DOMSource(root));
        } finally {
            closeStream(xsd);
        }
    }

    private static void closeStream(Closeable stream) {
        if (stream != null) {
            try {
                stream.close();
            } catch (IOException e) {
            }
        }
    }
}

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2. getRootElement(final String respuestaPost)
3. getRootElement(final XMLEventReader bufferedXmlEventReader)
4. getRootElement(String elementName, String namespace, String prefix)
5. getRootElement(String location)
6. getRootElementName(Class clazz)
7. getRootElementPosition(String buf, Element root)
8. getRootFaceletElement(Document document)
9. getRootFromPom(File pomFile)