com.hack23.cia.service.external.common.impl.XmlAgentImpl.java Source code

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Here is the source code for com.hack23.cia.service.external.common.impl.XmlAgentImpl.java

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/*
 * Copyright 2010 James Pether Srling
 *
 * 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.
 *
 *   $Id$
 *  $HeadURL$
*/
package com.hack23.cia.service.external.common.impl;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import org.apache.http.client.fluent.Request;
import org.jdom2.Document;
import org.jdom2.Namespace;
import org.jdom2.input.SAXBuilder;
import org.jdom2.input.sax.XMLReaderSAX2Factory;
import org.jdom2.transform.JDOMSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.oxm.Unmarshaller;
import org.springframework.stereotype.Service;

import com.hack23.cia.service.external.common.api.XmlAgent;

/**
 * The Class XmlAgentImpl.
 */
@Service
public final class XmlAgentImpl implements XmlAgent {

    /** The Constant LOGGER. */
    private static final Logger LOGGER = LoggerFactory.getLogger(XmlAgentImpl.class);

    /**
     * Instantiates a new xml agent impl.
     */
    public XmlAgentImpl() {
        super();
    }

    /**
     * Read with string buffer.
     *
     * @param fr
     *            the fr
     * @return the string
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    private static String readWithStringBuffer(final Reader fr) throws IOException {

        final BufferedReader br = new BufferedReader(fr);
        String line;
        final StringBuilder result = new StringBuilder();
        while ((line = br.readLine()) != null) {
            result.append(line);
        }

        return result.toString();
    }

    @Override
    public String retriveContent(final String accessUrl) throws Exception {
        final URL url = new URL(accessUrl.replace(" ", ""));

        final BufferedReader inputStream = new BufferedReader(
                new InputStreamReader(url.openStream(), StandardCharsets.UTF_8));

        return readWithStringBuffer(inputStream);
    }

    /**
     * Sets the name space on xml stream.
     *
     * @param in
     *            the in
     * @param nameSpace
     *            the name space
     * @return the source
     * @throws Exception
     *             the exception
     */
    private static Source setNameSpaceOnXmlStream(final InputStream in, final String nameSpace) throws Exception {
        final SAXBuilder sb = new SAXBuilder(new XMLReaderSAX2Factory(false));
        final Document doc = sb.build(in);
        doc.getRootElement().setNamespace(Namespace.getNamespace(nameSpace));
        return new JDOMSource(doc);
    }

    @Override
    public Object unmarshallXml(final Unmarshaller unmarshaller, final String accessUrl) throws Exception {
        return unmarshallXml(unmarshaller, accessUrl, null, null, null);
    }

    @Override
    public Object unmarshallXml(final Unmarshaller unmarshaller, final String accessUrl, final String nameSpace,
            final String replace, final String with) throws Exception {

        LOGGER.info("Calls {}", accessUrl);

        final boolean isWeb = accessUrl.toLowerCase().startsWith("http://")
                || accessUrl.toLowerCase().startsWith("https://");

        String xmlContent;
        if (isWeb) {
            xmlContent = Request.Get(accessUrl.replace(" ", "")).execute().returnContent()
                    .asString(StandardCharsets.UTF_8);
        } else {
            xmlContent = readInputStream(accessUrl.replace(" ", ""));
        }

        if (replace != null) {
            xmlContent = xmlContent.replace(replace, with);
        }

        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(
                xmlContent.getBytes(StandardCharsets.UTF_8));

        Source source;
        if (nameSpace != null) {
            source = setNameSpaceOnXmlStream(byteArrayInputStream, nameSpace);
        } else {
            source = new StreamSource(byteArrayInputStream);
        }

        return unmarshaller.unmarshal(source);
    }

    /**
     * Read input stream.
     *
     * @param accessUrl
     *            the access url
     * @return the string
     * @throws Exception
     *             the exception
     */
    private static String readInputStream(final String accessUrl) throws Exception {
        final URL url = new URL(accessUrl.replace(" ", ""));

        final URLConnection connection = url.openConnection();

        final InputStream stream = connection.getInputStream();

        final BufferedReader inputStream = new BufferedReader(new InputStreamReader(stream));

        return readWithStringBuffer(inputStream);
    }
}