eu.esdihumboldt.hale.ui.service.instance.sample.internal.sampler.first.FirstSampler.java Source code

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Here is the source code for eu.esdihumboldt.hale.ui.service.instance.sample.internal.sampler.first.FirstSampler.java

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/*
 * Copyright (c) 2013 Data Harmonisation Panel
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */

package eu.esdihumboldt.hale.ui.service.instance.sample.internal.sampler.first;

import java.util.Map;

import org.eclipse.swt.widgets.Composite;

import com.google.common.base.Function;
import com.google.common.collect.Maps;
import com.ibm.icu.text.MessageFormat;

import eu.esdihumboldt.hale.common.core.io.Value;
import eu.esdihumboldt.hale.common.instance.model.InstanceCollection;
import eu.esdihumboldt.hale.common.instance.model.ext.InstanceCollection2;
import eu.esdihumboldt.hale.common.instance.model.ext.impl.PerTypeInstanceCollection;
import eu.esdihumboldt.hale.common.schema.model.TypeDefinition;
import eu.esdihumboldt.hale.ui.common.AttributeEditor;
import eu.esdihumboldt.hale.ui.common.editors.IntegerEditor;
import eu.esdihumboldt.hale.ui.common.editors.value.IntegerValueEditor;
import eu.esdihumboldt.hale.ui.service.instance.sample.Sampler;

/**
 * Sampler that returns the first n instances.
 * 
 * @author Simon Templer
 */
public class FirstSampler implements Sampler {

    private static final String DISPLAY_NAME = "First {0} instances per type";

    private static final int DEFAULT_MAX = 500;

    @Override
    public InstanceCollection sample(InstanceCollection instances, Value settings) {
        final int max = settings.as(Integer.class, DEFAULT_MAX);

        if (max >= 1) {
            if (instances instanceof InstanceCollection2) {
                InstanceCollection2 fic = (InstanceCollection2) instances;
                if (fic.supportsFanout()) {
                    /*
                     * The instance collection supports fan-out by type -> so we
                     * apply the sampling on each instance collection
                     * individually
                     */
                    Map<TypeDefinition, InstanceCollection> collections = Maps.transformValues(fic.fanout(),
                            new Function<InstanceCollection, InstanceCollection>() {

                                @Override
                                public InstanceCollection apply(InstanceCollection org) {
                                    return new FirstOverallInstances(org, max);
                                }

                            });
                    return new PerTypeInstanceCollection(collections);
                }
            }

            return new FirstInstancesPerType(instances, max);
        }
        return instances;
    }

    @Override
    public String getDisplayName(Value settings) {
        Integer n = settings.as(Integer.class);

        if (n != null) {
            return MessageFormat.format(DISPLAY_NAME, n);
        } else {
            return MessageFormat.format(DISPLAY_NAME, 'n');
        }
    }

    @Override
    public AttributeEditor<Value> createEditor(Composite parent) {
        return new IntegerValueEditor(new IntegerEditor(parent, 100000, 1, 10, 100));
    }

    @Override
    public Value getDefaultSettings() {
        return Value.of(DEFAULT_MAX);
    }

}