/*
* Copyright 2013, The Sporting Exchange Limited
*
* 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.
*/
package com.betfair.cougar.transformations.manglers;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import com.betfair.cougar.codegen.ValidationException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* remove all simple types defined (except for valid values ones) and
* replace all references to them with their result.
*/
public class SimpleTypeMangler extends AbstractMangler {
@Override
public String getName() {
return "Simple Type Mangler";
}
@Override
public void mangleDocument(Node doc) {
try {
// First thing to is to get all simple types defined in the IDL
List<Node> simpleTypes = getChildrenWithName(getName(), doc, "simpleType");
// a container for checking if a simple type is already defined
Set<String> definedSimpleTypes = new HashSet<String>();
for (Node st: simpleTypes) {
List<Node> children = getChildrenWithName(getName(), st, "validValues");
if (children.isEmpty()) {
String name = getAttribute(getName(), st, "name");
String type = getAttribute(getName(), st, "type");
// check for simpleType duplicates
if(definedSimpleTypes.contains(name)){
throw new ValidationException("The data type " + name + " is already defined", st);
}else{
definedSimpleTypes.add(name);
}
replaceSimpleType(doc, name, type);
st.getParentNode().removeChild(st);
}
}
} catch (ValidationException e) {
throw new IllegalArgumentException("Unable to mangle document", e);
}
}
private void replaceSimpleType(Node doc, String simpleTypeName, String simpleTypePrimitive) throws ValidationException {
replaceViaXPath(doc, simpleTypeName, simpleTypePrimitive, "//parameter");
replaceViaXPath(doc, simpleTypeName, simpleTypePrimitive, "//simpleResponse");
replaceViaXPath(doc, simpleTypeName, simpleTypePrimitive, "//response");
}
private void replaceViaXPath(Node doc, String simpleTypeName, String simpleTypePrimitive, String xPath) throws ValidationException {
// Need to zap through the entire document and replace anything that has a type
// of the "name" parameter, and replace it's value with the "type" parameter.
final XPathFactory factory = XPathFactory.newInstance();
NodeList nodes;
try {
nodes = (NodeList) factory.newXPath().evaluate(xPath, doc, XPathConstants.NODESET);
} catch (XPathExpressionException e) {
throw new ValidationException("Unable to parse XPath "+xPath, doc, e);
}
for (int i = 0; i < nodes.getLength(); i++) {
Node n = nodes.item(i);
Node attrNode = getAttributeNode(getName(), n, "type");
String content = attrNode.getTextContent();
if (content.equals(simpleTypeName)) {
attrNode.setTextContent(simpleTypePrimitive);
} else {
// Need to check if it's a composite type and replace there.
String[] composites = getComposites(content);
boolean contentChanged = false;
if (composites != null) {
// It is a composite type - check the underlying data types
for (String composite: composites) {
if (composite.equals(simpleTypeName)) {
content = content.replace(simpleTypeName, simpleTypePrimitive);
contentChanged = true;
}
}
if (contentChanged) {
attrNode.setTextContent(content);
}
}
}
}
}
}