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;
                    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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        // introspect to obtain bean info
        XMLBeanInfo beanInfo = introspector.introspect( bean );
        if ( beanInfo != null ) {
            ElementDescriptor elementDescriptor = beanInfo.getElementDescriptor();
            if ( elementDescriptor != null ) {
                Context context = new Context( bean, log );
                if ( qualifiedName == null ) {
                    qualifiedName = elementDescriptor.getQualifiedName();
                }
                
                String ref = null;
                String id = null;
                
                // only give id's to non-primatives
                if ( elementDescriptor.isPrimitiveType() ) {
                    // write without an id
                    write( 
                        qualifiedName, 
                        elementDescriptor, 
                        context );
                } else {
                    pushBean ( context.getBean() );
                    if ( writeIDs ) {
                        ref = (String) idMap.get( context.getBean() );
                    }
                    if ( ref == null ) {
                        // this is the first time that this bean has be written
                        AttributeDescriptor idAttribute = beanInfo.getIDAttribute();
                        if (idAttribute == null) {

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        boolean writtenContent = false;
        if ( childDescriptors != null && childDescriptors.length > 0 ) {
            // process child elements
            for ( int i = 0, size = childDescriptors.length; i < size; i++ ) {
                ElementDescriptor childDescriptor = 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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                            String pathPrefix, 
                            boolean matchIDs ) {
        this( 
                descriptor, 
                beanClass, 
                new Context(), 
                pathPrefix,
                matchIDs);
    }

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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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