Examples of org.thymeleaf.standard.expression.IStandardConversionService

Package org.thymeleaf.standard.expression

Examples of org.thymeleaf.standard.expression.IStandardConversionService

org.thymeleaf.standard.expression.IStandardConversionService

Common interface for all implementations of a conversion service, to be used during template execution.

Thymeleaf conversion services work in a way similar to Spring Framework's ConversionService interface, but this is a generic mechanism (not dependent on Spring).

Default implementation —registered by {@link org.thymeleaf.standard.StandardDialect}— is {@link StandardConversionService}, which performs some standard conversions, but the Spring Standard Dialect used by the Thymeleaf + Spring integration module automatically registers an implementation of this interface that delegates on any existing Spring ConversionService objects (thus using the Converters and Formatters regitered at the Spring Application Context).

Important: there is one conversion that implementations of this interface should always implement, because it is heavily used at the Thymeleaf core: conversion of any Object to String.

The implementation of this interface that should be used is specified as an execution attribute by the Standard Dialects (see {@link org.thymeleaf.standard.StandardDialect#getExecutionAttributes()}).

Implementations of this interface should be thread-safe.
@author Daniel Fernández @since 2.1.0


            if (!expContext.getPerformTypeConversion()) {
                return exp.getValue(evaluationContext, evaluationRoot);
            }


            final IStandardConversionService conversionService =
                    StandardExpressions.getConversionService(configuration);


            if (conversionService instanceof SpringStandardConversionService) {
                // The conversion service is a mere bridge with the Spring ConversionService, therefore
                // this makes use of the complete Spring type conversion infrastructure, without needing
                // to manually execute the conversion.
                return exp.getValue(evaluationContext, evaluationRoot, String.class);
            }


            // We need type conversion, but conversion service is not a mere bridge to the Spring one,
            // so we need manual execution.
            final Object result = exp.getValue(evaluationContext, evaluationRoot);
            return conversionService.convert(configuration, processingContext, result, String.class);




        } catch (final TemplateProcessingException e) {
            throw e;
        } catch(final Exception e) {

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            if (!expContext.getPerformTypeConversion()) {
                return exp.getValue(evaluationContext, evaluationRoot);
            }


            final IStandardConversionService conversionService =
                    StandardExpressions.getConversionService(configuration);


            if (conversionService instanceof SpringStandardConversionService) {
                // The conversion service is a mere bridge with the Spring ConversionService, therefore
                // this makes use of the complete Spring type conversion infrastructure, without needing
                // to manually execute the conversion.
                return exp.getValue(evaluationContext, evaluationRoot, String.class);
            }


            // We need type conversion, but conversion service is not a mere bridge to the Spring one,
            // so we need manual execution.
            final Object result = exp.getValue(evaluationContext, evaluationRoot);
            return conversionService.convert(configuration, processingContext, result, String.class);




        } catch (final TemplateProcessingException e) {
            throw e;
        } catch(final Exception e) {

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    }




    public Object convert(final Object target, final Class<?> clazz) {


        final IStandardConversionService conversionService =
                StandardExpressions.getConversionService(this.configuration);
        return conversionService.convert(this.configuration, this.processingContext, target, clazz);
    }

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