com.ibm.common.geojson.FeatureCollection.java Source code

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Here is the source code for com.ibm.common.geojson.FeatureCollection.java

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/**
 * Copyright 2013 OpenSocial Foundation
 * Copyright 2013 International Business Machines Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Utility library for working with Activity Streams Actions
 * Requires underscorejs.
 *
 * @author James M Snell (jasnell@us.ibm.com)
 */
package com.ibm.common.geojson;

import static com.ibm.common.geojson.BoundingBox.calculateBoundingBoxFeatures;

import java.io.ObjectStreamException;
import java.util.Iterator;

import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

/**
 * A GeoJSON FeatureCollection object
 * see http://geojson.org/geojson-spec.html#feature-collection-objects
 * @author james
 *
 */
public final class FeatureCollection extends GeoObject<FeatureCollection> implements Iterable<Feature> {

    public static final class Builder extends GeoObject.Builder<FeatureCollection, Builder> {

        private final ImmutableList.Builder<Feature> list = ImmutableList.builder();

        public Builder() {
            type(GeoObject.Type.FEATURECOLLECTION);
        }

        public Builder add(Iterable<Feature> features) {
            list.addAll(features);
            return this;
        }

        public Builder add(Feature feature, Feature... features) {
            list.add(feature);
            if (features != null)
                list.add(features);
            return this;
        }

        public Builder add(Supplier<Feature> feature) {
            return add(feature.get());
        }

        @Override
        public void preGet() {
            set("features", list.build());
        }

        @Override
        public FeatureCollection doGet() {
            return new FeatureCollection(this);
        }

    }

    FeatureCollection(Builder builder) {
        super(builder);
    }

    public Iterable<Feature> features() {
        return this.<Iterable<Feature>>get("features", ImmutableList.<Feature>of());
    }

    public int size() {
        return Iterables.size(features());
    }

    public Feature get(int idx) {
        return Iterables.get(features(), idx);
    }

    public Iterator<Feature> iterator() {
        return features().iterator();
    }

    @Override
    protected FeatureCollection makeWithBoundingBox() {
        return new FeatureCollection.Builder().from(this).add(this).boundingBox(calculateBoundingBoxFeatures(this))
                .get();
    }

    Object writeReplace() throws java.io.ObjectStreamException {
        return new SerializedForm(this);
    }

    private static class SerializedForm
            extends AbstractSerializedForm<FeatureCollection, FeatureCollection.Builder> {
        private static final long serialVersionUID = -2060301713159936281L;

        protected SerializedForm(FeatureCollection obj) {
            super(obj);
        }

        Object readResolve() throws ObjectStreamException {
            return doReadResolve();
        }

        @Override
        protected FeatureCollection.Builder builder() {
            return GeoMakers.featureCollection();
        }
    }
}