Examples with JexlContext org.apache.commons.jexl2.JexlContext used on opensource projects

Example 1 with JexlContext

use of org.apache.commons.jexl2.JexlContext in project opennms by OpenNMS.

the class JEXL method filter.

@Override
public void filter(RowSortedTable<Long, String, Double> qrAsTable) throws Exception {
    // Prepare the JEXL context
    final Map<String, Object> jexlValues = Maps.newHashMap();
    jexlValues.put("table", qrAsTable);
    final JexlContext context = new MapContext(jexlValues);
    // Compile the expression
    Expression expression = jexl.createExpression(m_expression);
    // Evaluate the expression
    expression.evaluate(context);
}

Example 2 with JexlContext

use of org.apache.commons.jexl2.JexlContext in project opennms by OpenNMS.

the class JEXLExpressionEngine method applyExpressions.

/**
 * {@inheritDoc}
 */
@Override
public void applyExpressions(final QueryRequest request, final FetchResults results) throws ExpressionException {
    Preconditions.checkNotNull(request, "request argument");
    Preconditions.checkNotNull(results, "results argument");
    final int numExpressions = request.getExpressions().size();
    // Don't do anything if there are no expressions
    if (numExpressions < 1) {
        return;
    }
    // Use to keep track of transient expression so that we don't
    // allocate memory to store their results
    int numNonTransientExpression = 0;
    boolean[] transientFlags = new boolean[numExpressions];
    // Compile the expressions
    int j, k = 0;
    final LinkedHashMap<String, org.apache.commons.jexl2.Expression> expressions = Maps.newLinkedHashMap();
    for (final Expression e : request.getExpressions()) {
        // Populate the transientFlags array
        transientFlags[k] = e.getTransient();
        if (!transientFlags[k]) {
            numNonTransientExpression++;
        }
        k++;
        try {
            expressions.put(e.getLabel(), jexl.createExpression(e.getExpression()));
        } catch (JexlException ex) {
            throw new ExpressionException(ex, "Failed to parse expression label '{}'.", e.getLabel());
        }
    }
    // Prepare the JEXL context
    final Map<String, Object> jexlValues = Maps.newHashMap();
    final JexlContext context = new MapContext(jexlValues);
    // Add constants (i.e. values from strings.properties) retrieved by the fetch operation
    jexlValues.putAll(results.getConstants());
    LOG.debug("JEXL context constants: {}", jexlValues);
    // Add some additional constants for ease of use
    jexlValues.put("__inf", Double.POSITIVE_INFINITY);
    jexlValues.put("__neg_inf", Double.NEGATIVE_INFINITY);
    jexlValues.put("NaN", Double.NaN);
    jexlValues.put("__E", java.lang.Math.E);
    jexlValues.put("__PI", java.lang.Math.PI);
    // Add JexlEvaluateFunctions with current context and jexl engine to allow string constants to be evaluated.
    JexlEvaluateFunctions jexlEvaluateFunctions = new JexlEvaluateFunctions(context, jexl);
    jexl.getFunctions().put("jexl", jexlEvaluateFunctions);
    final long[] timestamps = results.getTimestamps();
    final Map<String, double[]> columns = results.getColumns();
    final int numRows = timestamps.length;
    // Calculate the time span
    jexlValues.put("__diff_time", numRows < 1 ? 0d : timestamps[numRows - 1] - timestamps[0]);
    final double[][] expressionValues = new double[numNonTransientExpression][numRows];
    // Iterate through all of the rows, apply the expressions
    for (int i = 0; i < numRows; i++) {
        // Evaluate every expression, in the same order as which they appeared in the query
        j = k = 0;
        for (final Map.Entry<String, org.apache.commons.jexl2.Expression> expressionEntry : expressions.entrySet()) {
            // Update the timestamp
            jexlValues.put("timestamp", timestamps[i]);
            // add index as a referenced variable in context
            jexlValues.put("__i", Integer.valueOf(i));
            // overwriting values from the last loop
            for (final String sourceLabel : columns.keySet()) {
                jexlValues.put(sourceLabel, columns.get(sourceLabel)[i]);
                // add reference to complete array for each column to allow backwards referencing of samples
                jexlValues.put("__" + sourceLabel, columns.get(sourceLabel));
            }
            // Evaluate the expression
            try {
                Object derived = expressionEntry.getValue().evaluate(context);
                double derivedAsDouble = Utils.toDouble(derived);
                // Only store the values for non-transient expressions
                if (!transientFlags[j++]) {
                    expressionValues[k++][i] = derivedAsDouble;
                }
                // Store the result back in the context, so that it can be referenced
                // by subsequent expression in the row
                jexlValues.put(expressionEntry.getKey(), derivedAsDouble);
            } catch (NullPointerException | NumberFormatException e) {
                throw new ExpressionException(e, "The return value from expression with label '" + expressionEntry.getKey() + "' could not be cast to a Double.");
            } catch (JexlException e) {
                throw new ExpressionException(e, "Failed to evaluate expression with label '" + expressionEntry.getKey() + "'.");
            }
        }
    }
    // Store the results
    j = k = 0;
    for (final String expressionLabel : expressions.keySet()) {
        if (!transientFlags[j++]) {
            columns.put(expressionLabel, expressionValues[k++]);
        }
    }
}

Example 3 with JexlContext

use of org.apache.commons.jexl2.JexlContext in project opennms by OpenNMS.

the class JMXMonitor method poll.

/**
 * {@inheritDoc}
 */
@Override
public PollStatus poll(MonitoredService svc, Map<String, Object> map) {
    final InetAddress ipv4Addr = svc.getAddress();
    PollStatus serviceStatus = PollStatus.unavailable();
    try {
        final Timer timer = new Timer();
        final JmxConnectionManager connectionManager = new DefaultConnectionManager(ParameterMap.getKeyedInteger(map, "retry", 3));
        final JmxConnectionManager.RetryCallback retryCallback = new JmxConnectionManager.RetryCallback() {

            @Override
            public void onRetry() {
                timer.reset();
            }
        };
        try (JmxServerConnectionWrapper connection = connectionManager.connect(getConnectionName(), ipv4Addr, JmxUtils.convertToStringMap(map), retryCallback)) {
            // Start with simple communication
            connection.getMBeanServerConnection().getMBeanCount();
            // Take time just here to get not influenced by test execution
            // time
            final long nanoResponseTime = System.nanoTime() - timer.getStartTime();
            // Find all variable definitions
            final Map<String, Object> variables = Maps.newHashMap();
            for (final String key : map.keySet()) {
                // Skip fast if it does not start with the prefix
                if (!key.startsWith(PARAM_BEAN_PREFIX)) {
                    continue;
                }
                // Get the variable name
                final String variable = key.substring(PARAM_BEAN_PREFIX.length());
                // Get the variable definition
                final String definition = ParameterMap.getKeyedString(map, key, null);
                // Store wrapper for variable definition
                variables.put(variable, ObjectNameWrapper.create(connection.getMBeanServerConnection(), definition));
            }
            // Find all test definitions
            final Map<String, Expression> tests = Maps.newHashMap();
            for (final String key : map.keySet()) {
                // Skip fast if it does not start with the prefix
                if (!key.startsWith(PARAM_TEST_PREFIX)) {
                    continue;
                }
                // Get the test name
                final String variable = key.substring(PARAM_TEST_PREFIX.length());
                // Get the test definition
                final String definition = ParameterMap.getKeyedString(map, key, null);
                // Build the expression from the definition
                final Expression expression = JEXL_ENGINE.createExpression(definition);
                // Store expressions
                tests.put(variable, expression);
            }
            // Also handle a single test
            if (map.containsKey(PARAM_TEST)) {
                // Get the test definition
                final String definition = ParameterMap.getKeyedString(map, PARAM_TEST, null);
                // Build the expression from the definition
                final Expression expression = JEXL_ENGINE.createExpression(definition);
                // Store expressions
                tests.put(null, expression);
            }
            // Build the context for all tests
            final JexlContext context = new ReadonlyContext(new MapContext(variables));
            serviceStatus = PollStatus.up(nanoResponseTime / 1000000.0);
            // Execute all tests
            for (final Map.Entry<String, Expression> e : tests.entrySet()) {
                if (!(boolean) e.getValue().evaluate(context)) {
                    serviceStatus = PollStatus.down("Test failed: " + e.getKey());
                    break;
                }
            }
        } catch (JmxServerConnectionException mbse) {
            // Number of retries exceeded
            String reason = "IOException while polling address: " + ipv4Addr;
            LOG.debug(reason);
            serviceStatus = PollStatus.unavailable(reason);
        }
    } catch (Throwable e) {
        String reason = "Monitor - failed! " + InetAddressUtils.str(ipv4Addr);
        LOG.debug(reason);
        serviceStatus = PollStatus.unavailable(reason);
    }
    return serviceStatus;
}

Example 4 with JexlContext

use of org.apache.commons.jexl2.JexlContext in project nutch by apache.

the class CrawlDatum method evaluate.

public boolean evaluate(Expression expr, String url) {
    if (expr != null && url != null) {
        // Create a context and add data
        JexlContext jcontext = new MapContext();
        // https://issues.apache.org/jira/browse/NUTCH-2229
        jcontext.set("url", url);
        jcontext.set("status", getStatusName(getStatus()));
        jcontext.set("fetchTime", (long) (getFetchTime()));
        jcontext.set("modifiedTime", (long) (getModifiedTime()));
        jcontext.set("retries", getRetriesSinceFetch());
        jcontext.set("interval", new Integer(getFetchInterval()));
        jcontext.set("score", getScore());
        jcontext.set("signature", StringUtil.toHexString(getSignature()));
        // Set metadata variables
        for (Map.Entry<Writable, Writable> entry : getMetaData().entrySet()) {
            Object value = entry.getValue();
            Text tkey = (Text) entry.getKey();
            if (value instanceof FloatWritable) {
                FloatWritable fvalue = (FloatWritable) value;
                jcontext.set(tkey.toString(), fvalue.get());
            }
            if (value instanceof IntWritable) {
                IntWritable ivalue = (IntWritable) value;
                jcontext.set(tkey.toString(), ivalue.get());
            }
            if (value instanceof Text) {
                Text tvalue = (Text) value;
                jcontext.set(tkey.toString().replace("-", "_"), tvalue.toString());
            }
            if (value instanceof ProtocolStatus) {
                ProtocolStatus pvalue = (ProtocolStatus) value;
                jcontext.set(tkey.toString().replace("-", "_"), pvalue.toString());
            }
        }
        try {
            if (Boolean.TRUE.equals(expr.evaluate(jcontext))) {
                return true;
            }
        } catch (Exception e) {
        // 
        }
    }
    return false;
}

Example 5 with JexlContext

use of org.apache.commons.jexl2.JexlContext in project vorto by eclipse.

the class AbstractDataMapper method matchesCondition.

private boolean matchesCondition(Map<String, String> attributes, JXPathContext context) {
    if (attributes.containsKey(ATTRIBUTE_CONDITION) && !attributes.get(ATTRIBUTE_CONDITION).equals("")) {
        Expression e = JEXL.createExpression(normalizeCondition(attributes.get(ATTRIBUTE_CONDITION)));
        JexlContext jc = new ObjectContext<Object>(JEXL, context.getContextBean());
        jc.set("this", context.getContextBean());
        return (boolean) e.evaluate(jc);
    } else {
        return true;
    }
}