io.virtdata.core.ContextualMapBindings Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of virtdata-lib-realer Show documentation

With inspiration from other libraries

The newest version!

package io.virtdata.core;

import io.virtdata.api.Binder;
import io.virtdata.api.ValuesMapBinder;

import java.util.HashMap;
import java.util.Map;

/**
 * A thread-local template that describes a set of data mappers, a context object, and a method for applying
 * mapped values to the context object via a String-Object map. This type is used in thread-local scope to map thread-specific
 * data mapper instances to a contextual template object and a method for applying mapped values to it.
 *
 * This type is generally constructed by a ContextualBindingsTemplate.
 *
 * @param  The type of the contextual template object.
 * @param  The resulting type from binding mapped values with the contextual template C
 */
public class ContextualMapBindings implements Binder {

    private final C context;
    private Bindings bindings;
    private ValuesMapBinder valuesMapBinder;

    public ContextualMapBindings(Bindings bindings, C context, ValuesMapBinder valuesMapBinder) {
        this.bindings = bindings;
        this.context = context;
        this.valuesMapBinder = valuesMapBinder;
    }

    public Bindings getBindings() {
        return bindings;
    }

    public C getContext() {
        return context;
    }

    @Override
    public R bind(long value) {
        Map generatedValues = new HashMap();
        bindings.setMap(generatedValues, value);
        try { // Provide bindings context data where it may be useful
            return valuesMapBinder.bindValues(context, generatedValues);
        } catch (Exception e) {
            throw new RuntimeException("Binding error:" + bindings.getTemplate().toString() + ": " + generatedValues, e);
        }

    }
}