FeatureFolderPropertyTester.java

package com.technophobia.substeps.junit.launcher.model;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jdt.core.IPackageFragment;

import com.technophobia.substeps.FeatureEditorPlugin;
import com.technophobia.substeps.predicate.IsFeatureFolderPredicate;
import com.technophobia.substeps.supplier.Predicate;

public class FeatureFolderPropertyTester extends PropertyTester {

    private static final String PROPERTY_NAME = "isFeatureFolder";

    private final Predicate<IFolder> predicate;


    public FeatureFolderPropertyTester() {
        this(new IsFeatureFolderPredicate(FeatureEditorPlugin.instance().projectManager()));
    }


    public FeatureFolderPropertyTester(final Predicate<IFolder> predicate) {
        this.predicate = predicate;
    }


    @Override
    public boolean test(final Object receiver, final String property, final Object[] args, final Object expectedValue) {
        if (PROPERTY_NAME.equals(property)) {
            final IFolder folder = asFolder(receiver);
            if (folder != null) {
                return predicate.forModel(folder);
            }
        }
        return false;
    }


    private IFolder asFolder(final Object receiver) {
        if (receiver instanceof IFolder) {
            return (IFolder) receiver;
        } else if (receiver instanceof IPackageFragment) {
            return asFolder(((IPackageFragment) receiver).getResource());
        } else if (receiver instanceof IAdaptable) {
            return (IFolder) ((IAdaptable) receiver).getAdapter(IFolder.class);
        }

        FeatureEditorPlugin.instance().error(
                "Unable to convert object " + receiver + " of type " + receiver.getClass().getName() + " to type "
                        + IFolder.class.getName() + ". Returning null");
        return null;
    }
}