ReadInvocationHandler(
final Node node,
final Method method,
final String annotationValue,
final XBProjector projector,
final boolean absentIsEmpty) {
super(node, method, annotationValue, projector);
wrappedInOptional = ReflectionHelper.isOptional(method.getGenericReturnType());
returnType =
wrappedInOptional
? ReflectionHelper.getParameterType(method.getGenericReturnType())
: method.getReturnType();
Class<?>[] exceptionTypes = method.getExceptionTypes();
exceptionType = exceptionTypes.length > 0 ? exceptionTypes[0] : null;
this.isConvertable = projector.config().getTypeConverter().isConvertable(returnType);
this.isReturnAsNode = Node.class.isAssignableFrom(returnType);
this.isEvaluateAsList =
List.class.equals(returnType) || ReflectionHelper.isStreamClass(returnType);
this.isReturnAsStream = ReflectionHelper.isStreamClass(returnType);
this.isEvaluateAsArray = returnType.isArray();
if (wrappedInOptional && (isEvaluateAsArray || isEvaluateAsList)) {
throw new IllegalArgumentException(
"Method "
+ method
+ " must not declare an optional return type of list or array. Lists and arrays may be empty but will never be null.");
}
this.isEvaluateAsSubProjection = returnType.isInterface();
this.isThrowIfAbsent = exceptionType != null;
// Throwing exception overrides empty default value.
this.absentIsEmpty = absentIsEmpty && (!isThrowIfAbsent);
}
ProjectionMethodInvocationHandler(
final Node node,
final Method method,
final String annotationValue,
final XBProjector projector) {
this.method = method;
this.annotationValue = annotationValue;
this.projector = projector;
this.node = node;
final XBDocURL annotation = method.getAnnotation(XBDocURL.class);
this.docAnnotationValue = annotation == null ? null : annotation.value();
this.isVoidMethod = !ReflectionHelper.hasReturnType(method);
methodParameterIndexes = ReflectionHelper.getMethodParameterIndexes(method);
}
/**
* When reading collections, determine the collection component type.
*
* @param method
* @return
*/
private static Class<?> findTargetComponentType(final Method method) {
if (method.getReturnType().isArray()) {
return method.getReturnType().getComponentType();
}
if (!(ReflectionHelper.isStreamClass(method.getReturnType())
|| List.class.equals(method.getReturnType()))) {
return null;
}
final Type type = method.getGenericReturnType();
if (!(type instanceof ParameterizedType)
|| (((ParameterizedType) type).getActualTypeArguments() == null)
|| (((ParameterizedType) type).getActualTypeArguments().length < 1)) {
throw new IllegalArgumentException(
"When using List as return type for method "
+ method
+ ", please specify a generic type for the List. Otherwise I do not know which type I should fill the List with.");
}
assert ((ParameterizedType) type).getActualTypeArguments().length == 1 : "";
Type componentType = ((ParameterizedType) type).getActualTypeArguments()[0];
if (!(componentType instanceof Class)) {
throw new IllegalArgumentException(
"I don't know how to instantiate the generic type for the return type of method "
+ method);
}
return (Class<?>) componentType;
}
/**
* If parameter is instance of Callable or Supplier then resolve its value.
*
* @param args
* @param args2
*/
private static void unwrapArgs(final Class<?>[] types, final Object[] args) {
if (args == null) {
return;
}
try {
for (int i = 0; i < args.length; ++i) {
args[i] = ReflectionHelper.unwrap(types[i], args[i]);
}
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
@Override
public Object invokeXpathProjection(
final InvocationContext invocationContext, final Object proxy, final Object[] args)
throws Throwable {
final Object result = invokeReadProjection(invocationContext, proxy, args);
if ((result == null) && (isThrowIfAbsent)) {
XBDataNotFoundException dataNotFoundException =
new XBDataNotFoundException(invocationContext.getResolvedXPath());
if (XBDataNotFoundException.class.equals(exceptionType)) {
throw dataNotFoundException;
}
ReflectionHelper.throwThrowable(exceptionType, args, dataNotFoundException);
}
return result;
}
@Override
public Object invokeXpathProjection(
final InvocationContext invocationContext, final Object proxy, final Object[] args)
throws Throwable {
assert ReflectionHelper.hasParameters(method);
final Node node = getNodeForMethod(method, args);
// final Document document = DOMHelper.getOwnerDocumentFor(node);
// final XPath xPath = projector.config().createXPath(document);
final XPathExpression expression = invocationContext.getxPathExpression();
final Object valueToSet = args[findIndexOfValue];
// final Class<?> typeToSet = method.getParameterTypes()[findIndexOfValue];
// final boolean isMultiValue = isMultiValue(typeToSet);
NodeList nodes = (NodeList) expression.evaluate(node, XPathConstants.NODESET);
final int count = nodes.getLength();
for (int i = 0; i < count; ++i) {
final Node n = nodes.item(i);
if (n == null) {
continue;
}
if (Node.ATTRIBUTE_NODE == n.getNodeType()) {
Element e = ((Attr) n).getOwnerElement();
if (e == null) {
continue;
}
DOMHelper.setOrRemoveAttribute(
e, n.getNodeName(), valueToSet == null ? null : valueToSet.toString());
continue;
}
if (valueToSet instanceof Element) {
if (!(n instanceof Element)) {
throw new IllegalArgumentException(
"XPath for element update need to select elements only");
}
DOMHelper.replaceElement((Element) n, (Element) ((Element) valueToSet).cloneNode(true));
continue;
}
n.setTextContent(valueToSet == null ? null : valueToSet.toString());
}
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(count));
}
protected Node getNodeForMethod(final Method method, final Object[] args)
throws SAXException, IOException, ParserConfigurationException {
if (docAnnotationValue != null) {
String uri =
projector.config().getExternalizer().resolveURL(docAnnotationValue, method, args);
final Map<String, String> requestParams =
((IOBuilder) projector.io()).filterRequestParamsFromParams(uri, args);
uri = Preprocessor.applyParams(uri, methodParameterIndexes, args);
Class<?> callerClass = null;
if (IOHelper.isResourceProtocol(uri)) {
callerClass = ReflectionHelper.getCallerClass(8);
}
return IOHelper.getDocumentFromURL(
projector.config().createDocumentBuilder(),
uri,
requestParams,
method.getDeclaringClass(),
callerClass);
}
return node;
}
ProjectionInvocationHandler(
final XBProjector projector,
final Node node,
final Class<?> projectionInterface,
final Map<Class<?>, Object> mixins,
final boolean toStringRendersXML,
final boolean absentIsEmpty) {
final Object defaultInvokerObject =
DefaultDOMAccessInvoker.create(projectionInterface, node, projector, toStringRendersXML);
final Map<MethodSignature, InvocationHandler> defaultInvocationHandlers =
getDefaultInvokers(defaultInvokerObject);
for (Entry<Class<?>, Object> e : mixins.entrySet()) {
for (Method m : e.getKey().getMethods()) {
mixinHandlers.put(
MethodSignature.forMethod(m), new MixinInvoker(e.getValue(), projectionInterface));
}
}
handlers.putAll(defaultInvocationHandlers);
List<Class<?>> allSuperInterfaces =
ReflectionHelper.findAllSuperInterfaces(projectionInterface);
for (Class<?> i7e : allSuperInterfaces) {
for (Method m : i7e.getDeclaredMethods()) {
if (Modifier.isPrivate(m.getModifiers())) {
// ignore private methods
continue;
}
final MethodSignature methodSignature = MethodSignature.forMethod(m);
if (ReflectionHelper.isDefaultMethod(m)) {
handlers.put(methodSignature, DEFAULT_METHOD_INVOCATION_HANDLER);
final XBOverride xbOverride = m.getAnnotation(XBOverride.class);
if (xbOverride != null) {
handlers.put(
methodSignature.overridenBy(xbOverride.value()),
new OverrideByDefaultMethodInvocationHandler(m));
}
continue;
}
if (defaultInvocationHandlers.containsKey(methodSignature)) {
continue;
}
{
final XBRead readAnnotation = m.getAnnotation(XBRead.class);
if (readAnnotation != null) {
handlers.put(
methodSignature,
new ReadInvocationHandler(
node, m, readAnnotation.value(), projector, absentIsEmpty));
continue;
}
}
{
final XBUpdate updateAnnotation = m.getAnnotation(XBUpdate.class);
if (updateAnnotation != null) {
handlers.put(
methodSignature,
new UpdateInvocationHandler(node, m, updateAnnotation.value(), projector));
continue;
}
}
{
final XBWrite writeAnnotation = m.getAnnotation(XBWrite.class);
if (writeAnnotation != null) {
handlers.put(
methodSignature,
new WriteInvocationHandler(node, m, writeAnnotation.value(), projector));
continue;
}
}
{
final XBDelete delAnnotation = m.getAnnotation(XBDelete.class);
if (delAnnotation != null) {
handlers.put(
methodSignature,
new DeleteInvocationHandler(node, m, delAnnotation.value(), projector));
continue;
}
}
if (mixinHandlers.containsKey(methodSignature)) {
continue;
}
throw new IllegalArgumentException(
"I don't known how to handle method "
+ m
+ ". Did you forget to add a XB*-annotation or to register a mixin?");
}
}
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args)
throws Throwable {
return ReflectionHelper.invokeDefaultMethod(method, args, proxy);
}
@Override
public Object invokeProjection(
final String resolvedXpath, final Object proxy, final Object[] args) throws Throwable {
// final String pathToElement = resolvedXpath.replaceAll("\\[@",
// "[attribute::").replaceAll("/?@.*", "").replaceAll("\\[attribute::", "[@");
lastInvocationContext.updateMethodArgs(args);
final Document document = DOMHelper.getOwnerDocumentFor(node);
assert document != null;
final Object valueToSet = args[findIndexOfValue];
final boolean isMultiValue = isMultiValue(method.getParameterTypes()[findIndexOfValue]);
// ROOT element update
if ("/*".equals(resolvedXpath)) { // Setting a new root element.
if (isMultiValue) {
throw new IllegalArgumentException(
"Method "
+ method
+ " was invoked as setter changing the document root element, but tries to set multiple values.");
}
return handeRootElementReplacement(proxy, method, document, valueToSet);
}
final boolean wildCardTarget = resolvedXpath.endsWith("/*");
try {
if (!lastInvocationContext.isStillValid(resolvedXpath)) {
final DuplexExpression duplexExpression =
wildCardTarget
? new DuplexXPathParser(projector.config().getUserDefinedNamespaceMapping())
.compile(resolvedXpath.substring(0, resolvedXpath.length() - 2))
: new DuplexXPathParser(projector.config().getUserDefinedNamespaceMapping())
.compile(resolvedXpath);
MethodParamVariableResolver resolver = null;
if (duplexExpression.isUsingVariables()) {
resolver =
new MethodParamVariableResolver(
method, args, duplexExpression, projector.config().getStringRenderer(), null);
duplexExpression.setXPathVariableResolver(resolver);
}
Class<?> targetComponentType = findTargetComponentType(method);
lastInvocationContext =
new InvocationContext(
resolvedXpath,
null,
null,
duplexExpression,
resolver,
targetComponentType,
projector);
}
final DuplexExpression duplexExpression = lastInvocationContext.getDuplexExpression();
if (duplexExpression.getExpressionType().isMustEvalAsString()) {
throw new XBPathException("Unwriteable xpath selector used ", method, resolvedXpath);
}
// MULTIVALUE
if (isMultiValue) {
if (duplexExpression.getExpressionType().equals(ExpressionType.ATTRIBUTE)) {
throw new IllegalArgumentException(
"Method "
+ method
+ " was invoked as setter changing some attribute, but was declared to set multiple values. I can not create multiple attributes for one path.");
}
final Iterable<?> iterable2Set =
valueToSet == null
? Collections.emptyList()
: (valueToSet.getClass().isArray())
? ReflectionHelper.array2ObjectList(valueToSet)
: (Iterable<?>) valueToSet;
if (wildCardTarget) {
// TODO: check support of ParameterizedType e.g. Supplier
final Element parentElement = (Element) duplexExpression.ensureExistence(node);
DOMHelper.removeAllChildren(parentElement);
int count = 0;
for (Object o : iterable2Set) {
if (o == null) {
continue;
}
++count;
if (o instanceof Node) {
DOMHelper.appendClone(parentElement, (Node) o);
continue;
}
if (o instanceof DOMAccess) {
DOMHelper.appendClone(parentElement, ((DOMAccess) o).getDOMBaseElement());
continue;
}
throw new XBPathException(
"When using a wildcard target, the type to set must be a DOM Node or another projection. Otherwise I can not determine the element name.",
method,
resolvedXpath);
}
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(count));
}
final Element parentElement = duplexExpression.ensureParentExistence(node);
duplexExpression.deleteAllMatchingChildren(parentElement);
int count = applyIterableSetOnElement(iterable2Set, parentElement, duplexExpression);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(count));
}
// ATTRIBUTES
if (duplexExpression.getExpressionType().equals(ExpressionType.ATTRIBUTE)) {
if (wildCardTarget) {
// TODO: This may never happen, right?
throw new XBPathException(
"Wildcards are not allowed when writing to an attribute. I need to know to which Element I should set the attribute",
method,
resolvedXpath);
}
Attr attribute = (Attr) duplexExpression.ensureExistence(node);
if (valueToSet == null) {
attribute.getOwnerElement().removeAttributeNode(attribute);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
DOMHelper.setStringValue(attribute, valueToSet.toString());
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
if ((valueToSet instanceof Node) || (valueToSet instanceof DOMAccess)) {
if (valueToSet instanceof Attr) {
if (wildCardTarget) {
throw new XBPathException(
"Wildcards are not allowed when writing an attribute. I need to know to which Element I should set the attribute",
method,
resolvedXpath);
}
Element parentNode = duplexExpression.ensureParentExistence(node);
if (((Attr) valueToSet).getNamespaceURI() != null) {
parentNode.setAttributeNodeNS((Attr) valueToSet);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
parentNode.setAttributeNode((Attr) valueToSet);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
final Element newNodeOrigin =
valueToSet instanceof DOMAccess
? ((DOMAccess) valueToSet).getDOMBaseElement()
: (Element) valueToSet;
final Element newNode = (Element) newNodeOrigin.cloneNode(true);
DOMHelper.ensureOwnership(document, newNode);
if (wildCardTarget) {
Element parentElement = (Element) duplexExpression.ensureExistence(node);
DOMHelper.removeAllChildren(parentElement);
parentElement.appendChild(newNode);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
Element previousElement = (Element) duplexExpression.ensureExistence(node);
DOMHelper.replaceElement(previousElement, newNode);
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
}
final Element elementToChange = (Element) duplexExpression.ensureExistence(node);
if (valueToSet == null) {
// TODO: This should depend on the parameter type?
// If param type == String, no structural change might be expected.
DOMHelper.removeAllChildren(elementToChange);
} else {
final String asString =
projector
.config()
.getStringRenderer()
.render(
valueToSet.getClass(),
valueToSet,
duplexExpression.getExpressionFormatPattern());
elementToChange.setTextContent(asString);
}
return getProxyReturnValueForMethod(proxy, method, Integer.valueOf(1));
} catch (XBPathParsingException e) {
throw new XBPathException(e, method, resolvedXpath);
}
}
private Object invokeReadProjection(
final InvocationContext invocationContext, final Object proxy, final Object[] args)
throws Throwable {
final Node node = getNodeForMethod(method, args);
final ExpressionType expressionType =
invocationContext.getDuplexExpression().getExpressionType();
final XPathExpression expression = invocationContext.getxPathExpression();
if (isConvertable) {
String data;
if (expressionType.isMustEvalAsString()) {
data = (String) expression.evaluate(node, XPathConstants.STRING);
} else {
Node dataNode = (Node) expression.evaluate(node, XPathConstants.NODE);
data = dataNode == null ? null : dataNode.getTextContent();
}
if ((data == null) && (absentIsEmpty)) {
data = "";
}
try {
final Object result =
projector
.config()
.getTypeConverter()
.convertTo(returnType, data, invocationContext.getExpressionFormatPattern());
return wrappedInOptional ? ReflectionHelper.createOptional(result) : result;
} catch (NumberFormatException e) {
throw new NumberFormatException(
e.getMessage() + " XPath was:" + invocationContext.getResolvedXPath());
}
}
if (isReturnAsNode) {
// Try to evaluate as node
// if evaluated type does not match return type, ClassCastException will follow
final Object result = expression.evaluate(node, XPathConstants.NODE);
return wrappedInOptional ? ReflectionHelper.createOptional(result) : result;
}
if (isEvaluateAsList) {
assert !wrappedInOptional : "Projection methods returning list will never return null";
final List<?> result =
DefaultXPathEvaluator.evaluateAsList(expression, node, method, invocationContext);
return isReturnAsStream ? ReflectionHelper.toStream(result) : result;
}
if (isEvaluateAsArray) {
assert !wrappedInOptional : "Projection methods returning array will never return null";
final List<?> list =
DefaultXPathEvaluator.evaluateAsList(expression, node, method, invocationContext);
return list.toArray(
(Object[])
java.lang.reflect.Array.newInstance(returnType.getComponentType(), list.size()));
}
if (isEvaluateAsSubProjection) {
final Node newNode = (Node) expression.evaluate(node, XPathConstants.NODE);
if (newNode == null) {
return wrappedInOptional ? ReflectionHelper.createOptional(null) : null;
}
final DOMAccess subprojection = (DOMAccess) projector.projectDOMNode(newNode, returnType);
return wrappedInOptional ? ReflectionHelper.createOptional(subprojection) : subprojection;
}
throw new IllegalArgumentException(
"Return type "
+ returnType
+ " of method "
+ method
+ " is not supported. Please change to an projection interface, a List, an Array or one of current type converters types:"
+ projector.config().getTypeConverter());
}
