Examples of org.apache.commons.betwixt.expression.Context

Package org.apache.commons.betwixt.expression

Examples of org.apache.commons.betwixt.expression.Context

org.apache.commons.betwixt.expression.Context

Context describes the context used to evaluate bean expressions. This is mostly a bean together with a number of context variables. Context variables are named objects. In other words, a context variable associates an object with a string.

Logging during expression evaluation is done through the logging instance held by this class. The object initiating the evaluation should control this logging and so passing a Log instance is enforced by the constructors.

Context is a natural place to include shared evaluation code. One of the problems that you get with object graphs is that they can be cyclic. Xml cannot (directly) include cycles. Therefore betwixt needs to find and deal properly with cycles. The algorithm used is to check the parentage of a new child. If the child is a parent then that operation fails.
@author James Strachan

            // process child elements
            for ( int i = 0, size = childDescriptors.length; i < size; i++ ) {
                if (childDescriptors[i] instanceof ElementDescriptor) {
                    // Element content
                    ElementDescriptor childDescriptor = (ElementDescriptor) childDescriptors[i];
                    Context childContext = context;
                    childContext.pushOptions(childDescriptor.getOptions());
                    Expression childExpression = childDescriptor.getContextExpression();
                    if ( childExpression != null ) {
                        Object childBean = childExpression.evaluate( context );
                        if ( childBean != null ) {
                            String qualifiedName = childDescriptor.getQualifiedName();
                            String namespaceUri = childDescriptor.getURI();
                            String localName = childDescriptor.getLocalName();
                            // XXXX: should we handle nulls better
                            if ( childBean instanceof Iterator ) {
                                for ( Iterator iter = (Iterator) childBean; iter.hasNext(); ) {
                                    Object object = iter.next();
                                    if (object == null) {
                                        continue;
                                    }
                                    writeBean( 
                                            namespaceUri, 
                                            localName, 
                                            qualifiedName, 
                                            object, 
                                            childDescriptor,
                                            context );
                                }
                            } else {
                                writeBean( 
                                            namespaceUri, 
                                            localName, 
                                            qualifiedName, 
                                            childBean, 
                                            childDescriptor,
                                            context );
                            }
                        }                    
                    } else {
                        writeElement(
                                    childDescriptor.getURI(), 
                                    childDescriptor.getLocalName(), 
                                    childDescriptor.getQualifiedName(), 
                                    childDescriptor, 
                                    childContext );
                    }
                    childContext.popOptions();
                } else {
                    // Mixed text content
                    // evaluate the body text 
                    Expression expression = childDescriptors[i].getTextExpression();
                    if ( expression != null ) {

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      * Ensure that they are correctly configured.
      * @param bean make a new Context for this bean
      * @return not null
      */
    private Context makeContext(Object bean) {
        return new Context( bean, log, bindingConfiguration );
    }

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                            String pathPrefix, 
                            boolean matchIDs ) {
        this( 
                descriptor, 
                beanClass, 
                new Context(), 
                pathPrefix,
                matchIDs);
    }

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            // process child elements
            for ( int i = 0, size = childDescriptors.length; i < size; i++ ) {
                if (childDescriptors[i] instanceof ElementDescriptor) {
                    // Element content
                    ElementDescriptor childDescriptor = (ElementDescriptor) childDescriptors[i];
                    Context childContext = context;
                    Expression childExpression = childDescriptor.getContextExpression();
                    if ( childExpression != null ) {
                        Object childBean = childExpression.evaluate( context );
                        if ( childBean != null ) {
                            String qualifiedName = childDescriptor.getQualifiedName();

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      * Ensure that they are correctly configured.
      * @param bean make a new Context for this bean
      * @return not null
      */
    private Context makeContext(Object bean) {
        return new Context( bean, log, bindingConfiguration );
    }

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                            String pathPrefix, 
                            boolean matchIDs ) {
        this( 
                descriptor, 
                beanClass, 
                new Context(), 
                pathPrefix,
                matchIDs);
    }

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                if ( log.isTraceEnabled() ) {
                    log.trace("Body with text " + text);
                }
                if ( digester.getCount() > 0 ) {
                    Context bodyContext = context.newContext( digester.peek() );
                    // Take the first content descriptor
                    ElementDescriptor typeDescriptor = getElementDescriptor( descriptor );
                    TextDescriptor descriptor = typeDescriptor.getPrimaryBodyTextDescriptor();
                    if ( descriptor != null ) {
                        if ( log.isTraceEnabled() ) {

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                            String pathPrefix, 
                            boolean matchIDs ) {
        this( 
                descriptor, 
                beanClass, 
                new Context(), 
                pathPrefix,
                matchIDs);
    }

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            // process child elements
            for ( int i = 0, size = childDescriptors.length; i < size; i++ ) {
                if (childDescriptors[i] instanceof ElementDescriptor) {
                    // Element content
                    ElementDescriptor childDescriptor = (ElementDescriptor) childDescriptors[i];
                    Context childContext = context;
                    Expression childExpression = childDescriptor.getContextExpression();
                    if ( childExpression != null ) {
                        Object childBean = childExpression.evaluate( context );
                        if ( childBean != null ) {
                            String qualifiedName = childDescriptor.getQualifiedName();

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      * Ensure that they are correctly configured.
      * @param bean make a new Context for this bean
      * @return not null
      */
    private Context makeContext(Object bean) {
        return new Context( bean, log, bindingConfiguration );
    }

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Related Classes of org.apache.commons.betwixt.expression.Context

org.apache.commons.betwixt.BindingConfiguration

org.apache.commons.betwixt.io.AbstractBeanWriter

org.apache.commons.betwixt.io.BeanCreateRule

org.apache.commons.betwixt.io.BeanRuleSet$ReadingContext$BeanRule

org.apache.commons.betwixt.Options

java.util.HashMap

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