private void load(InputStream is) throws IOException {
Document doc = XmlUtils.parseInputStream(is);
XPath xp = XmlUtils.createXPath();
columns.clear();
try {
String firstLineHeaderStr = xp.evaluate("/AllColumns/@firstLineHeader", doc);
if (firstLineHeaderStr != null && firstLineHeaderStr.equals("true")) {
firstLineHeader = true;
}
NodeList nodes = (NodeList) xp.evaluate("/AllColumns/Column", doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
Element s = (Element) nodes.item(i);
Column c = new Column();
c.setName(s.getAttribute("name"));
String type = s.getAttribute("type");
if (type == null || type.isEmpty()) {
type = FactorType.Unknown.toString();
}
c.setType(Column.FactorType.valueOf(type));
String tmp = s.getAttribute("min");
if (tmp.isEmpty() == false) {
c.setMin(Double.valueOf(tmp));
}
tmp = s.getAttribute("max");
if (tmp.isEmpty() == false) {
c.setMax(Double.valueOf(tmp));
}
tmp = s.getAttribute("count");
if (tmp.isEmpty() == false) {
c.setCount(Long.valueOf(tmp));
}
tmp = s.getAttribute("sum");
if (tmp.isEmpty() == false) {
c.setSum(Double.valueOf(tmp));
}
tmp = s.getAttribute("quartile1");
if (tmp.isEmpty() == false) {
c.setQuartile1(Double.valueOf(tmp));
}
tmp = s.getAttribute("quartile2");
if (tmp.isEmpty() == false) {
c.setQuartile2(Double.valueOf(tmp));
}
tmp = s.getAttribute("quartile3");
if (tmp.isEmpty() == false) {
c.setQuartile3(Double.valueOf(tmp));
}
columns.add(c);
}
} catch (XPathExpressionException e) {
throw new IOException("Error parsing XML", e);
}
}
public void fromXML(final InputStream strm) throws ColorScaleException {
try {
fromXML(XmlUtils.parseInputStream(strm));
} catch (final Exception e) {
throw new ColorScaleException(e);
}
}
public void store(OutputStream os) throws IOException {
Document doc = XmlUtils.createDocument();
Element root = doc.createElement("AllColumns");
root.setAttribute("firstLineHeader", firstLineHeader ? "true" : "false");
doc.appendChild(root);
String pigLoad = "loaded = LOAD 'filename' USING PigStorage() AS (";
String comma = "";
for (Column c : columns) {
pigLoad += comma + c.getName();
comma = ", ";
Element node = doc.createElement("Column");
root.appendChild(node);
node.setAttribute("name", c.getName());
node.setAttribute("type", c.getType().toString());
if (c.getCount() > 0) {
node.setAttribute("count", Long.toString(c.getCount()));
}
if (c.getType() == FactorType.Numeric) {
if (c.getSum() > 0.0) {
node.setAttribute("sum", Double.toString(c.getSum()));
}
if (c.getMin() <= c.getMax()) {
node.setAttribute("min", Double.toString(c.getMin()));
node.setAttribute("max", Double.toString(c.getMax()));
}
if (c.isQuartile1Valid()) {
node.setAttribute("quartile1", Double.toString(c.getQuartile1()));
}
if (c.isQuartile2Valid()) {
node.setAttribute("quartile2", Double.toString(c.getQuartile2()));
}
if (c.isQuartile3Valid()) {
node.setAttribute("quartile3", Double.toString(c.getQuartile3()));
}
}
}
pigLoad += ");";
Comment c = doc.createComment(pigLoad);
root.appendChild(c);
XmlUtils.writeDocument(doc, new OutputStreamWriter(os));
}
/**
* Sets a nodes child to have a given value. If the child doesn't exist it is created.
*
* @param parent
* @param childName
* @param childValue
* @throws XPathExpressionException
*/
public static void setChild(Node parent, String childName, String childValue)
throws XPathExpressionException {
Document doc = parent.getOwnerDocument();
XPath xpath = XmlUtils.createXPath();
Node childNode = (Node) xpath.evaluate(childName, parent, XPathConstants.NODE);
if (childNode == null) {
childNode = doc.createElement(childName);
parent.appendChild(childNode);
}
childNode.setTextContent(childValue);
}
/**
* Sets the altitude of all Polygons
*
* @throws XPathExpressionException
*/
public static void setAltitude(Document doc, double altitude, String altitudeMode)
throws XPathExpressionException {
XPath xpath = XmlUtils.createXPath();
// only polygons are supported at this time
XPathExpression expr = xpath.compile("/kml/*/Polygon");
NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
Node polygonNode = nodes.item(i);
setChild(polygonNode, "altitude", new Double(altitude).toString());
if (altitudeMode != null) {
setChild(polygonNode, "altitudeMode", altitudeMode);
}
}
throw new XPathExpressionException("I haven't been tested!");
}
public void fromXML(final Document doc) throws ColorScaleException {
try {
clear();
final XPath xpath = XmlUtils.createXPath();
name = xpath.evaluate("/ColorMap/@name", doc);
final Node nodeTitle = (Node) xpath.evaluate("/ColorMap/Title", doc, XPathConstants.NODE);
if (nodeTitle != null) {
title = xpath.evaluate("text()", nodeTitle);
}
final Node nodeDesc =
(Node) xpath.evaluate("/ColorMap/Description", doc, XPathConstants.NODE);
if (nodeDesc != null) {
description = xpath.evaluate("text()", nodeDesc);
}
scaling = Scaling.valueOf(xpath.evaluate("/ColorMap/Scaling/text()", doc));
final String reliefShadingStr =
xpath.evaluate("/ColorMap/ReliefShading/text()", doc).toLowerCase();
reliefShading = reliefShadingStr.equals("1") || reliefShadingStr.equals("true");
final String interpolateStr =
xpath.evaluate("/ColorMap/Interpolate/text()", doc).toLowerCase();
interpolate =
interpolateStr.isEmpty() || (interpolateStr.equals("1") || interpolateStr.equals("true"));
final String forceStr =
xpath.evaluate("/ColorMap/ForceValuesIntoRange/text()", doc).toLowerCase();
forceValuesIntoRange = (forceStr.equals("1") || forceStr.equals("true"));
final Node nullColorNode =
(Node) xpath.evaluate("/ColorMap/NullColor", doc, XPathConstants.NODE);
if (nullColorNode != null) {
final String colorStr = xpath.evaluate("@color", nullColorNode);
final String opacityStr = xpath.evaluate("@opacity", nullColorNode);
parseColor(colorStr, opacityStr, nullColor);
}
final int[] color = new int[4];
final XPathExpression expr = xpath.compile("/ColorMap/Color");
final NodeList nodes = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodes.getLength(); i++) {
final Node node = nodes.item(i);
final String valueStr = xpath.evaluate("@value", node);
final String colorStr = xpath.evaluate("@color", node);
final String opacityStr = xpath.evaluate("@opacity", node);
if (valueStr.isEmpty()) {
throw new IOException(
"Error parsing XML: A value must be specified for a color element.");
}
final double value = Double.valueOf(valueStr);
parseColor(colorStr, opacityStr, color);
put(value, color);
}
cache = null;
} catch (final Exception e) {
throw new BadXMLException(e);
}
}