JSON PropertyBinding

JSONBinding.java

import org.apache.tapestry5.internal.bindings.AbstractBinding;
import org.apache.tapestry5.internal.bindings.PropBinding;
import org.apache.tapestry5.json.JSONObject;

public class JSONBinding extends AbstractBinding {

    private final String prop;

    private final PropBinding propBinding;

    public JSONBinding(final String prop,
                       final PropBinding propBinding) {

        this.prop = prop;
        this.propBinding = propBinding;
    }

    @Override
    public Object get() {

        return ((JSONObject) propBinding.get()).get(prop);
    }

}

JSONBindingFactory.java

import org.apache.tapestry5.Binding;
import org.apache.tapestry5.ComponentResources;
import org.apache.tapestry5.PropertyConduit;
import org.apache.tapestry5.internal.bindings.PropBinding;
import org.apache.tapestry5.internal.services.StringInterner;
import org.apache.tapestry5.ioc.Location;
import org.apache.tapestry5.services.BindingFactory;
import org.apache.tapestry5.services.PropertyConduitSource;

public class JSONBindingFactory implements BindingFactory {

    private final PropertyConduitSource source;

    private final StringInterner interner;

    public JSONBindingFactory(PropertyConduitSource propertyConduitSource, StringInterner interner)
    {
        source = propertyConduitSource;
        this.interner = interner;
    }

    @Override
    public Binding newBinding(final String description,
                              final ComponentResources container,
                              final ComponentResources component,
                              final String expression,
                              final Location location) {

        Object target = container.getComponent();
        Class targetClass = target.getClass();

        final int indexOfFirstDot = expression.indexOf(".");
        final String ex = expression.substring(0, indexOfFirstDot);
        final String prop = expression.substring(indexOfFirstDot + 1);

        PropertyConduit conduit = source.create(targetClass, ex);

        String toString = interner.format("JSONBinding[%s %s(%s)]", description, container
                .getCompleteId(), expression);

        return new JSONBinding(prop, new PropBinding(location, target, conduit, toString));
    }
}

JSONBindingModule.java

import org.apache.tapestry5.ioc.MappedConfiguration;
import org.apache.tapestry5.services.BindingFactory;

public class JSONBindingModule {
    public static void contributeBindingSource(MappedConfiguration<String, BindingFactory> configuration) {

        configuration.addInstance("json", JSONBindingFactory.class);
    }
}

trythis.tml

${json:js.name1}