Expression
that refers to a method on an object. The {@link ExpressionFactory#createMethodExpression} methodcan be used to parse an expression string and return a concrete instance of
MethodExpression
that encapsulates the parsed expression. The {@link FunctionMapper} is used at parse time, not evaluation time, so one is not needed to evaluate an expression using this class. However, the {@link ELContext} is needed at evaluation time.
The {@link #getMethodInfo} and {@link #invoke} methods will evaluate the expression each time they are called. The {@link ELResolver} in the
ELContext
is used to resolve the top-level variables and to determine the behavior of the .
and []
operators. For any of the two methods, the {@link ELResolver#getValue} method is used to resolve all properties up to but excluding the last one. This provides the base
object on which the method appears. If the base
object is null, a NullPointerException
must be thrown. At the last resolution, the final property
is then coerced to a String
, which provides the name of the method to be found. A method matching the name and expected parameters provided at parse time is found and it is either queried or invoked (depending on the method called on this MethodExpression
).
See the notes about comparison, serialization and immutability in the {@link Expression} javadocs.
@see javax.el.ELResolver
@see javax.el.Expression
@see javax.el.ExpressionFactory
@see javax.el.MethodExpression
@author Jacob Hookom [jacob@hookom.net]
@version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
assert (body != null);
try {
writer.write(body);
} catch (IOException e) {
throw new StrutsException("IOError while writing the body: " + e.getMessage(), e);
}
if (popComponentStack) {
popComponentStack();
}
return false;
+ getComponentName()
+ "', field '"
+ field
+ (parameters != null && parameters.containsKey("name") ? "', name '"
+ parameters.get("name") : "") + "': " + errorMsg;
throw new StrutsException(msg, e);
}
}
try {
objectFactory.getClassInstance(actionClass.getName());
} catch (ClassNotFoundException e) {
logger.error("Object Factory was unable to load class {}", actionClass.getName());
throw new StrutsException("Object Factory was unable to load class " + actionClass.getName(),
e);
}
String[] beanNames = beanNameFinder.getBeanNames(actionClass);
switch (beanNames.length) {
case 0:
if(it.hasNext()) {
sb.append("&");
}
}
} catch (UnsupportedEncodingException e) {
throw new StrutsException("Encoding "+ENCODING+" not found");
}
}
RenderResponse resp = PortletActionContext.getRenderResponse();
RenderRequest req = PortletActionContext.getRenderRequest();
return resp.encodeURL(req.getContextPath() + sb.toString());
mapping = actionMapper.getMapping(httpRequest, dispatcherUtils.getConfigurationManager());
}
}
if (mapping == null) {
throw new StrutsException("Unable to locate action mapping for request, probably due to " +
"an invalid action path: "+actionPath);
}
return mapping;
}
}
if (count-- <= 0) {
locks.remove(o);
o.notify();
throw new StrutsException("Deadlock in session lock");
}
o.wait(10000);
}
;
locks.put(o, invocation);
InputStream in = null;
try {
in = settingsUrl.openStream();
settings.load(in);
} catch (IOException e) {
throw new StrutsException("Could not load " + name + ".properties:" + e, e);
} finally {
if(in != null) {
try {
in.close();
} catch(IOException io) {
public String getBeanName() {
return "actionerror";
}
protected Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
return new ActionError(stack, req, res);
}
public String getBeanName() {
return "actionmessage";
}
protected Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
return new ActionMessage(stack, req, res);
}
protected String portletUrlType;
protected String anchor;
protected String forceAddSchemeHostAndPort;
public Component getBean(ValueStack stack, HttpServletRequest req, HttpServletResponse res) {
return new Anchor(stack, req, res);
}
Related Classes of org.apache.struts2.el.MethodExpressionImpl
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