Examples of JexlEngine

org.apache.commons.jexl2.JexlEngine
Creates and evaluates Expression and Script objects. Determines the behavior of Expressions & Scripts during their evaluation with respect to:
- Introspection, see {@link Uberspect}
- Arithmetic & comparison, see {@link JexlArithmetic}
- Error reporting
- Logging
The setSilent and setLenient methods allow to fine-tune an engine instance behavior according to various error control needs. The lenient/strict flag tells the engine when and if null as operand is considered an error, the silent/verbose flag tells the engine what to do with the error (log as warning or throw exception).
- When "silent" & "lenient":
  0 & null should be indicators of "default" values so that even in an case of error, something meaningfull can still be inferred; may be convenient for configurations.
- When "silent" & "strict":
  One should probably consider using null as an error case - ie, every object manipulated by JEXL should be valued; the ternary operator, especially the '?:' form can be used to workaround exceptional cases. Use case could be configuration with no implicit values or defaults.
- When "verbose" & "lenient":
  The error control grain is roughly on par with JEXL 1.0
- When "verbose" & "strict":
  The finest error control grain is obtained; it is the closest to Java code - still augmented by "script" capabilities regarding automated conversions & type matching.
Note that methods that evaluate expressions may throw unchecked exceptions; The {@link JexlException} are thrown in "non-silent" mode but since these areRuntimeException, user-code should catch them wherever most appropriate.
@since 2.0

Examples of org.apache.commons.jexl2.JexlEngine

            // it worked!
        }
    }


    public void testVariable() throws Exception {
        JexlEngine jexl = new JexlEngine();
        jexl.setSilent(true);
        Asserter asserter = new Asserter(jexl);
        asserter.setVariable("foo", new Foo());
        asserter.setVariable("person", "James");


        asserter.assertExpression("person", "James");

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Examples of org.apache.commons.jexl2.JexlEngine

  private JexlEngine engine;
  private Expression expression;
  private boolean isStrict;


  public PartitionExpression(String expression, boolean isStrict) {
    this.engine = new JexlEngine();
    Map<String, Object> fns = new HashMap<String, Object>();
    fns.put(null, PartitionFunctions.class);
    this.engine.setFunctions(fns);
    this.engine.setStrict(true);
    this.engine.setSilent(false);

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Examples of org.apache.commons.jexl2.JexlEngine

  private JexlEngine engine;
  private Expression expression;
  private boolean isStrict;


  public PartitionExpression(String expression, boolean isStrict) {
    this.engine = new JexlEngine();
    Map<String, Object> fns = new HashMap<String, Object>();
    fns.put(null, PartitionFunctions.class);
    this.engine.setFunctions(fns);
    this.engine.setStrict(true);
    this.engine.setSilent(false);

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Examples of org.apache.commons.jexl2.JexlEngine

    /**
     * Get JexlEngine from ThreadLocal
     * @return JexlEngine
     */
    private static JexlEngine getJexlEngine() {
        JexlEngine engine = threadLocalJexl.get();
        if(engine == null) {
            engine = new JexlEngine();
            engine.setCache(512);
            engine.setLenient(false);
            engine.setSilent(false);
            threadLocalJexl.set(engine);
        }
        return engine;
    }

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Examples of org.apache.commons.jexl2.JexlEngine

    public void threadStarted() {
    }


    @Override
    public void threadFinished() {
        JexlEngine engine = threadLocalJexl.get();
        if(engine != null) {
            engine.clearCache();
            threadLocalJexl.remove();
        }
    }

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Examples of org.apache.commons.jexl2.JexlEngine

     * initialization code before expression creation &amp; evaluation.</p>
     * @param silent true means no JexlException will occur, false allows them
     */
    public void setJexlEngineSilent(boolean silent) {
        synchronized (this) {
            JexlEngine engine = getJexlEngine();
            engine.setSilent(silent);
            this.jexlEngineSilent = silent;
        }
    }

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Examples of org.apache.commons.jexl2.JexlEngine

     * initialization code before expression creation &amp; evaluation.</p>
     * @param strict true for strict, false for lenient
     */
    public void setJexlEngineStrict(boolean strict) {
        synchronized (this) {
            JexlEngine engine = getJexlEngine();
            engine.setStrict(strict);
            this.jexlEngineStrict = strict;
        }
    }

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Examples of org.apache.commons.jexl2.JexlEngine

     * This method can be overriden to specify more detailed options
     * into the JexlEngine.
     * @return
     */
    protected JexlEngine createJexlEngine() {
        JexlEngine engine = new JexlEngine();
        // With null prefix, define top-level user defined functions.
        // See javadoc of org.apache.commons.jexl2.JexlEngine#setFunctions(Map<String,Object> funcs) for detail.
        Map<String, Object> funcs = new HashMap<String, Object>();
        funcs.put(null, JexlBuiltin.class);
        engine.setFunctions(funcs);
        engine.setCache(256);
        return engine;
    }

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Examples of org.apache.commons.jexl2.JexlEngine

     * <EM>NOTE: The internal JexlEngine instance can be null when this is deserialized.</EM>
     * </P>
     * @return
     */
    private JexlEngine getJexlEngine() {
        JexlEngine engine = jexlEngine;
        if (engine == null) {
            synchronized (this) {
                engine = jexlEngine;
                if (engine == null) {
                    jexlEngine = engine = createJexlEngine();

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Examples of org.apache.commons.jexl2.JexlEngine

        }
        return super.getMethod(obj, method, args, info);
      }
    };


    JexlEngine engine = new JexlEngine(uberspect, null, null, null);
    engine.setStrict(true);
    engine.setClassLoader(cl);
    return engine;
  }

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