/**
* 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.
*/
package org.apache.isis.applib.services.xmlsnapshot;
import java.io.StringReader;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Locale;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.stream.StreamSource;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
public abstract class XmlSnapshotServiceAbstract implements XmlSnapshotService {
@Override
public Document asDocument(String xmlStr) {
try {
final StringReader reader = new StringReader(xmlStr);
final StreamSource streamSource = new StreamSource(reader);
final DOMResult result = new DOMResult();
final TransformerFactory tf = TransformerFactory.newInstance();
final Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
transformer.transform(streamSource, result);
final Node node = result.getNode();
return (Document) node;
} catch (TransformerException e) {
throw new XmlSnapshotService.Exception(e);
}
}
@SuppressWarnings("unchecked")
public <T> T getChildElementValue(final Element el, final String tagname, final Class<T> expectedCls) {
final Element chldEl = getChildElement(el, tagname);
final String dataType = chldEl.getAttribute("isis:datatype");
if(dataType == null) {
throw new IllegalArgumentException("unable to locate " + tagname + "/@datatype attribute");
}
if("isis:String".equals(dataType)) {
return (T)getChildTextValue(chldEl);
}
if("isis:LocalDate".equals(dataType)) {
final String str = getChildTextValue(chldEl);
final DateTimeFormatter forPattern = DateTimeFormat.forPattern("dd-MMM-yyyy").withLocale(Locale.ENGLISH);
return (T)forPattern.parseLocalDate(str);
}
if("isis:Byte".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Byte(str);
}
if("isis:Short".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Short(str);
}
if("isis:Integer".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Integer(str);
}
if("isis:Long".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Long(str);
}
if("isis:Float".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Float(str);
}
if("isis:Double".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T)new Double(str);
}
if("isis:BigDecimal".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T) new BigDecimal(str);
}
if("isis:BigInteger".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T) new BigInteger(str);
}
if("isis:Boolean".equals(dataType)) {
final String str = getChildTextValue(chldEl);
return (T) new Boolean(str);
}
throw new IllegalArgumentException(
"Datatype of '" + dataType + "' for element '" + tagname + "' not recognized");
}
public Element getChildElement(final Element el, final String tagname) {
NodeList elementsByTagName = el.getElementsByTagName(tagname);
final int length = elementsByTagName.getLength();
if(length != 1 || !(elementsByTagName.item(0) instanceof Element)) {
throw new IllegalArgumentException("unable to locate " + tagname + " element");
}
final Element item = (Element) elementsByTagName.item(0);
return item;
}
public String getChildTextValue(final Element el) {
final NodeList childNodes = el.getChildNodes();
if(childNodes.getLength() !=1 || !(childNodes.item(0) instanceof Text)) {
throw new IllegalArgumentException("unable to locate app:reference/text() node");
}
final Text referenceText = (Text) childNodes.item(0);
return referenceText.getData();
}
}