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https://issues.apache.org/jira/browse/JEXL-125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186801#comment-13186801
]
Henri Biestro commented on JEXL-125:
------------------------------------
This indeed is not a bug; the JexlContext only solves variables. To solve
'functions', you need a NamespaceResolver.
In case Maurizio's solution is not generic enough, you need an ObjectContext
that implements NamespaceResolver.
Unfortunately, the wrapped object in ObjectContext is not accessible (private)
so some duplication/copy/paste is needed.
One solution can thus be the following:
{code:title=TestFoo125.java|borderStyle=solid}
public static class Foo125 {
public String method() {
return "OK";
}
}
public static class Foo125Context implements JexlContext, NamespaceResolver
{
private final JexlEngine jexl;
private final Foo125 object;
@Override
public Object resolveNamespace(String name) {
if (name == null) {
return object;
} else {
return null;
}
}
public Foo125Context(JexlEngine engine, Foo125 wrapped) {
this.jexl = engine;
this.object = wrapped;
}
public Object get(String name) {
return jexl.getProperty(object, name);
}
public void set(String name, Object value) {
jexl.setProperty(object, name, value);
}
public boolean has(String name) {
return jexl.getUberspect().getPropertyGet(object, name, null) !=
null;
}
}
public void test125() throws Exception {
JexlEngine jexl = new JexlEngine();
Expression e = jexl.createExpression("method()");
JexlContext jc = new Foo125Context(jexl, new Foo125());
assertEquals("OK", e.evaluate(jc));
}
{code}
> Unable to invoke method with ObjectContext
> ------------------------------------------
>
> Key: JEXL-125
> URL: https://issues.apache.org/jira/browse/JEXL-125
> Project: Commons JEXL
> Issue Type: Bug
> Affects Versions: 2.1.1
> Environment: Java 1.6.0_20 on Windows 7
> Reporter: Matteo Trotta
>
> Hi, I'm trying to invoke a method on Object context but I can't get it to
> work.
> I don't know if it's a bug or I'm doing it wrong.
> Here it is the code I'm using:
> {code:title=JexlTest.java}
> package it.test;
> import org.apache.commons.jexl2.Expression;
> import org.apache.commons.jexl2.JexlContext;
> import org.apache.commons.jexl2.JexlEngine;
> import org.apache.commons.jexl2.ObjectContext;
> import org.junit.Test;
> public class JexlTest {
> public static class Foo {
> public String method() {
> return "OK";
> }
> }
> @Test
> public void test() throws Exception {
> JexlEngine jexl = new JexlEngine();
> jexl.setStrict(true);
> Expression e = jexl.createExpression("method()");
> JexlContext jc = new ObjectContext<Foo>(jexl, new Foo());
> System.out.println(e.evaluate(jc));
> }
> }
> {code}
> Here is the exception I'm getting:
> {noformat}
> org.apache.commons.jexl2.JexlException: it.test.JexlTest.test@19![0,8]:
> 'method();' method error
> at org.apache.commons.jexl2.Interpreter.call(Interpreter.java:1078)
> at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1100)
> at
> org.apache.commons.jexl2.parser.ASTMethodNode.jjtAccept(ASTMethodNode.java:18)
> at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1317)
> at
> org.apache.commons.jexl2.parser.ASTReference.jjtAccept(ASTReference.java:18)
> at org.apache.commons.jexl2.Interpreter.interpret(Interpreter.java:232)
> at
> org.apache.commons.jexl2.ExpressionImpl.evaluate(ExpressionImpl.java:65)
> at it.test.JexlTest.test(JexlTest.java:21)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:274)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:242)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:58)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:240)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:48)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:233)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:303)
> at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
> at
> com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:71)
> at
> com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)
> at
> com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
> Caused by: org.apache.commons.jexl2.JexlException$Property:
> org.apache.commons.jexl2.ObjectContext.get@42![0,9]: '#0.method;'
> inaccessible or unknown property #0
> at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1341)
> at
> org.apache.commons.jexl2.parser.ASTReference.jjtAccept(ASTReference.java:18)
> at org.apache.commons.jexl2.JexlEngine.getProperty(JexlEngine.java:615)
> at org.apache.commons.jexl2.JexlEngine.getProperty(JexlEngine.java:587)
> at org.apache.commons.jexl2.ObjectContext.get(ObjectContext.java:42)
> at org.apache.commons.jexl2.Interpreter.call(Interpreter.java:1047)
> {noformat}
> Using a MapContext with variable "foo" set to 'new Foo()' and the expression
> "foo.method()" gives no error.
> Anyway for my use it's more practical a ObjectContext, as I have only one
> object in the context.
> Thank you for very much and keep up the excellent work!
> Matteo Trotta
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