EditableValueHolderRule.java

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package com.sun.faces.facelets.tag.jsf;

import com.sun.faces.facelets.el.LegacyMethodBinding;

import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.event.MethodExpressionValueChangeListener;
import javax.faces.event.ValueChangeEvent;
import javax.faces.validator.MethodExpressionValidator;
import javax.faces.view.facelets.*;

/**
 * 
 * @author Jacob Hookom
 */
public final class EditableValueHolderRule extends MetaRule {

    final static class LiteralValidatorMetadata extends Metadata {

        private final String validatorId;

        public LiteralValidatorMetadata(String validatorId) {
            this.validatorId = validatorId;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            ((EditableValueHolder) instance).addValidator(ctx.getFacesContext()
                    .getApplication().createValidator(this.validatorId));
        }
    }

    final static class ValueChangedExpressionMetadata extends Metadata {
        private final TagAttribute attr;

        public ValueChangedExpressionMetadata(TagAttribute attr) {
            this.attr = attr;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            ((EditableValueHolder) instance)
                    .addValueChangeListener(new MethodExpressionValueChangeListener(
                            this.attr.getMethodExpression(ctx, null,
                                    VALUECHANGE_SIG)));
        }
    }

    final static class ValueChangedBindingMetadata extends Metadata {
        private final TagAttribute attr;

        public ValueChangedBindingMetadata(TagAttribute attr) {
            this.attr = attr;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            ((EditableValueHolder) instance)
                    .setValueChangeListener(new LegacyMethodBinding(this.attr
                            .getMethodExpression(ctx, null, VALUECHANGE_SIG)));
        }
    }

    final static class ValidatorExpressionMetadata extends Metadata {
        private final TagAttribute attr;

        public ValidatorExpressionMetadata(TagAttribute attr) {
            this.attr = attr;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            ((EditableValueHolder) instance)
                    .addValidator(new MethodExpressionValidator(this.attr
                            .getMethodExpression(ctx, null, VALIDATOR_SIG)));
        }
    }

    final static class ValidatorBindingMetadata extends Metadata {
        private final TagAttribute attr;

        public ValidatorBindingMetadata(TagAttribute attr) {
            this.attr = attr;
        }

        @Override
        public void applyMetadata(FaceletContext ctx, Object instance) {
            ((EditableValueHolder) instance)
                    .setValidator(new LegacyMethodBinding(this.attr
                            .getMethodExpression(ctx, null, VALIDATOR_SIG)));
        }
    }

    private final static Class[] VALIDATOR_SIG = new Class[] {
            FacesContext.class, UIComponent.class, Object.class };

    private final static Class[] VALUECHANGE_SIG = new Class[] { ValueChangeEvent.class };

    public final static EditableValueHolderRule Instance = new EditableValueHolderRule();

    @Override
    public Metadata applyRule(String name, TagAttribute attribute,
            MetadataTarget meta) {

        if (meta.isTargetInstanceOf(EditableValueHolder.class)) {

            if ("validator".equals(name)) {
                if (attribute.isLiteral()) {
                    return new LiteralValidatorMetadata(attribute.getValue());
                } else {
                    return new ValidatorExpressionMetadata(attribute);
                }
            }

            if ("valueChangeListener".equals(name)) {
                return new ValueChangedExpressionMetadata(attribute);
            }

        }
        return null;
    }

}