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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.builder.xml.dom;
import com.yahoo.text.XML;
import com.yahoo.vespa.model.utils.Duration;
import org.w3c.dom.Element;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
/**
* A w3c Element wrapper with a better API.
*
* Author unknown.
*/
public class ModelElement {
private final Element xml;
public ModelElement(Element xml) {
if (xml == null) throw new NullPointerException("Can not create ModelElement with null element");
if (xml.getNodeName() == null) throw new NullPointerException("Can not create ModelElement with unnamed element");
this.xml = xml;
}
public Element getXml() { return xml; }
/** Returns the child with the given name, or null if none. */
public ModelElement child(String name) {
Element e = XML.getChild(xml, name);
if (e == null) return null;
return new ModelElement(e);
}
/** If not found, return empty list. */
public List<ModelElement> children(String name) {
List<Element> e = XML.getChildren(xml, name);
List<ModelElement> list = new ArrayList<>();
e.forEach(element -> list.add(new ModelElement(element)));
return list;
}
public ModelElement childByPath(String path) {
StringTokenizer tokenizer = new StringTokenizer(path, ".");
ModelElement curElem = this;
while (tokenizer.hasMoreTokens() && curElem != null) {
String pathElem = tokenizer.nextToken();
ModelElement child = curElem.child(pathElem);
if (!tokenizer.hasMoreTokens()) {
if (child != null)
return child;
}
curElem = child;
}
return null;
}
public String childAsString(String path) {
StringTokenizer tokenizer = new StringTokenizer(path, ".");
ModelElement curElem = this;
while (tokenizer.hasMoreTokens() && curElem != null) {
String pathElem = tokenizer.nextToken();
ModelElement child = curElem.child(pathElem);
if (!tokenizer.hasMoreTokens()) {
String attr = curElem.stringAttribute(pathElem);
if (attr != null) {
return attr;
} else if (child != null) {
return child.asString();
}
}
curElem = child;
}
return null;
}
public String asString() {
return xml.getFirstChild().getTextContent();
}
public double asDouble() {
return Double.parseDouble(asString());
}
public long asLong() {
return (long) BinaryUnit.valueOf(asString());
}
public Duration asDuration() {
return new Duration(asString());
}
public Long childAsLong(String path) {
String child = childAsString(path);
if (child == null) return null;
return Long.parseLong(child.trim());
}
public Integer childAsInteger(String path) {
String child = childAsString(path);
if (child == null) return null;
return Integer.parseInt(child.trim());
}
public Double childAsDouble(String path) {
String child = childAsString(path);
if (child == null) return null;
return Double.parseDouble(child.trim());
}
public Boolean childAsBoolean(String path) {
String child = childAsString(path);
if (child == null) return null;
return Boolean.parseBoolean(child.trim());
}
public Duration childAsDuration(String path) {
String child = childAsString(path);
if (child == null) return null;
return new Duration(child);
}
/** Returns the given attribute or throws IllegalArgumentException if not present */
public int requiredIntegerAttribute(String name) {
if (stringAttribute(name) == null)
throw new IllegalArgumentException("Required attribute '" + name + "' is missing");
return integerAttribute(name, null);
}
/** Returns the value of this attribute or null if not present */
public Integer integerAttribute(String name) {
return integerAttribute(name, null);
}
public Integer integerAttribute(String name, Integer defaultValue) {
String value = stringAttribute(name);
if (value == null) return defaultValue;
return (int) BinaryUnit.valueOf(value);
}
public boolean booleanAttribute(String name) {
return booleanAttribute(name, false);
}
public boolean booleanAttribute(String name, boolean defaultValue) {
String value = stringAttribute(name);
if (value == null) return defaultValue;
return Boolean.parseBoolean(value);
}
public Long longAttribute(String name) {
String value = stringAttribute(name);
if (value == null) return null;
return (long) BinaryUnit.valueOf(value);
}
public Double doubleAttribute(String name) {
String value = stringAttribute(name);
if (value == null) return null;
return Double.parseDouble(value);
}
/** Returns the given attribute or throws IllegalArgumentException if not present */
public double requiredDoubleAttribute(String name) {
if (stringAttribute(name) == null)
throw new IllegalArgumentException("Required attribute '" + name + "' is missing");
return doubleAttribute(name);
}
/** Returns the content of the attribute with the given name, or null if none */
public String stringAttribute(String name) {
return stringAttribute(name, null);
}
/** Returns the content of the attribute with the given name, or the default value if none */
public String stringAttribute(String name, String defaultValue) {
if ( ! xml.hasAttribute(name)) return defaultValue;
return xml.getAttribute(name);
}
/** Returns the content of the attribute with the given name or throws IllegalArgumentException if not present */
public String requiredStringAttribute(String name) {
if (stringAttribute(name) == null)
throw new IllegalArgumentException("Required attribute '" + name + "' is missing");
return stringAttribute(name);
}
public List<ModelElement> subElements(String name) {
List<Element> elements = XML.getChildren(xml, name);
List<ModelElement> helpers = new ArrayList<>();
for (Element e : elements)
helpers.add(new ModelElement(e));
return helpers;
}
@Override
public String toString() {
return xml.getNodeName();
}
}
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