Examples of org.apache.camel.spi.Language

org.apache.camel.spi.Language
Represents a language to be used for {@link Expression} or {@link Predicate} instances @version $Revision: 1.1 $


        return params;
    }


    private Expression createFileLanguageExpression(String expression) {
        Language language;
        // only use file language if the name is complex (eg. using $)
        if (expression.contains("$")) {
            language = getCamelContext().resolveLanguage("file");
        } else {
            language = getCamelContext().resolveLanguage("constant");
        }
        return language.createExpression(expression);
    }

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    public Predicate getRetryWhilePolicy(CamelContext context) {
        Predicate answer = getRetryWhile();


        if (getRetryWhileRef() != null) {
            // its a bean expression
            Language bean = context.resolveLanguage("bean");
            answer = bean.createPredicate(getRetryWhileRef());
        }


        return answer;
    }

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        }
    }


    private static GenericFileExpressionRenamer<File> getDefaultCommitRenamer(CamelContext context) {
        // use context to lookup language to let it be loose coupled
        Language language = context.resolveLanguage("file");
        Expression expression = language.createExpression("${file:parent}/.camel/${file:onlyname}");
        return new GenericFileExpressionRenamer<File>(expression);
    }

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        if (name != null) {
            // the header name can be an expression too, that should override
            // whatever configured on the endpoint
            if (StringHelper.hasStartToken(name, "simple")) {
                log.trace("{} contains a Simple expression: {}", Exchange.FILE_NAME, name);
                Language language = getEndpoint().getCamelContext().resolveLanguage("file");
                expression = language.createExpression(name);
            }
        }
        if (expression != null) {
            log.trace("Filename evaluated as expression: {}", expression);
            name = expression.evaluate(exchange, String.class);

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    /**
     * Asserts that the given language name and expression evaluates to the
     * given value on a specific exchange
     */
    protected void assertExpression(Exchange exchange, String languageName, String expressionText, Object expectedValue) {
        Language language = assertResolveLanguage(languageName);


        Expression expression = language.createExpression(expressionText);
        assertNotNull("No Expression could be created for text: " + expressionText + " language: " + language, expression);


        assertExpression(expression, exchange, expectedValue);
    }

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    /**
     * Asserts that the given language name and predicate expression evaluates
     * to the expected value on the message exchange
     */
    protected void assertPredicate(String languageName, String expressionText, Exchange exchange, boolean expected) {
        Language language = assertResolveLanguage(languageName);


        Predicate predicate = language.createPredicate(expressionText);
        assertNotNull("No Predicate could be created for text: " + expressionText + " language: " + language, predicate);


        assertPredicate(predicate, exchange, expected);
    }

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    /**
     * Asserts that the language name can be resolved
     */
    protected Language assertResolveLanguage(String languageName) {
        Language language = context.resolveLanguage(languageName);
        assertNotNull("No language found for name: " + languageName, language);
        return language;
    }

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    // Helper methods
    // -----------------------------------------------------------------------


    public Language resolveLanguage(String language) {
        Language answer;
        synchronized (languages) {
            answer = languages.get(language);


            // check if the language is singleton, if so return the shared instance
            if (answer instanceof IsSingleton) {

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        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                // resolve language using context to have a clear separation of packages
                // must call evaluate to return the nested language evaluate when evaluating
                // stacked expressions
                Language language = exchange.getContext().resolveLanguage("simple");
                return language.createExpression(expression).evaluate(exchange, Object.class);
            }


            @Override
            public String toString() {
                return "simple(" + expression + ")";

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        return new ExpressionAdapter() {
            public Object evaluate(Exchange exchange) {
                // resolve language using context to have a clear separation of packages
                // must call evaluate to return the nested language evaluate when evaluating
                // stacked expressions
                Language language = exchange.getContext().resolveLanguage("bean");
                return language.createExpression(expression).evaluate(exchange, Object.class);
            }


            @Override
            public String toString() {
                return "bean(" + expression + ")";

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Related Classes of org.apache.camel.spi.Language

org.apache.camel.builder.DefaultErrorHandlerBuilder

org.apache.camel.builder.ExpressionBuilder

org.apache.camel.builder.ExpressionClause

org.apache.camel.builder.ExpressionClauseSupport

org.apache.camel.builder.FileExpressionBuilder

org.apache.camel.builder.xml.XPathBuilder

org.apache.camel.component.bean.DefaultAnnotationExpressionFactory

org.apache.camel.component.file.GenericFileDefaultSorter

org.apache.camel.component.file.GenericFileEndpoint

org.apache.camel.component.file.GenericFileProducer

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