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MetaObjects for Model-driven development - MetaData Libraries
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package com.draagon.meta.view;

import com.draagon.meta.InvalidMetaDataException;
import com.draagon.meta.MetaData;
import com.draagon.meta.MetaDataException;
import com.draagon.meta.attr.MetaAttribute;
import com.draagon.meta.attr.MetaAttributeNotFoundException;
import com.draagon.meta.field.MetaField;
import com.draagon.meta.loader.MetaDataLoader;
import com.draagon.meta.loader.MetaDataRegistry;
import com.draagon.meta.object.MetaObject;

public abstract class MetaView extends MetaData {
    //private static Log log = LogFactory.getLog( MetaView.class );

    public final static int READ = 0;
    public final static int EDIT = 1;
    public final static int HIDE = 2;

    public final static String TYPE_VIEW = "view";

    public final static String ATTR_VALIDATION = "validation";

    public MetaView(String subtype, String name) {
        super(TYPE_VIEW, subtype, name);
    }

    /**
     * Gets the primary MetaData class
     */
    public final Class getMetaDataClass() {
        return MetaView.class;
    }

    /** Add Child to the MetaView */
    //public MetaView addChild(MetaData data) throws InvalidMetaDataException {
    //  return super.addChild( data );
    //}

    /** Wrap the MetaView */
    //public MetaView overload() {
    //  return super.overload();
    //}

    /**
     * Sets an attribute of the MetaClass
     */
    //public MetaView addMetaAttr(MetaAttribute attr) {
    //  return addChild(attr);
    //}
    public MetaField getDeclaringMetaField() {
        if (getParent() instanceof MetaDataLoader) return null;
        if (getParent() instanceof MetaField) return (MetaField) getParent();
        throw new InvalidMetaDataException(this, "MetaViews can only be attached to MetaFields " +
                "or MetaDataLoaders as abstracts");
    }

    /**
     * Gets the Super Field
     */
    protected MetaView getSuperView() {
        return getSuperData();
    }

    /**
     * Retrieves the MetaField for this view associated
     * with the specified object.
     *
     * @param obj
     * @return
     */
    public MetaField getMetaField(Object obj) {
        MetaObject mc = MetaDataRegistry.findMetaObject(obj);
        return mc.getMetaField(getParent().getName());
    }

    /**
     * Retrieves the display string of the field for a simple display
     */
    public String getDisplayString(Object obj) {

        MetaObject mc = getLoader().getMetaObjectFor(obj);
        if (mc == null) MetaDataRegistry.findMetaObject(obj);
        MetaField mf = mc.getMetaField(getParent().getName());
        return "" + mf.getString(obj);
    }

    /**
     * Performs validation before setting the value
     */
    protected void performValidation(Object obj, Object val)
            throws MetaDataException {
        // Run any defined validators
        try {
            String list = getMetaAttr(ATTR_VALIDATION).getValueAsString();
            getMetaField(obj).getValidatorList(list).forEach(v -> v.validate(obj, val));
        } catch (MetaAttributeNotFoundException ignored) {
        }
    }
}