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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2015, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.data;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.geotools.data.simple.SimpleFeatureSource;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.Name;
import org.opengis.filter.Filter;

/**
 * Available via {@link DataUtilities#dataStore(SimpleFeatureSource)} methods.
 *
 * This implementation is a wrapper around a provided {@link SimpleFeatureSource}.
 *
 * @author Jody Garnett (Boundless)
 */
final class DataStoreAdaptor implements DataStore {
    private Name name;

    private SimpleFeatureSource source;

    private SimpleFeatureType schema;

    private String typeName;

    public DataStoreAdaptor(SimpleFeatureSource source) {
        this.source = source;
        this.schema = source.getSchema();
        this.name = schema.getName();
        this.typeName = name.getLocalPart();
    }

    @Override
    public void updateSchema(Name name, SimpleFeatureType featureType) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public void removeSchema(Name name) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public SimpleFeatureType getSchema(Name name) throws IOException {
        if (this.name.equals(name)) {
            return schema;
        }
        throw new IOException(
                "Not found: " + name + " DataStoreAdaptor datastore contains " + this.name);
    }

    @Override
    public List getNames() throws IOException {
        return Collections.singletonList(this.name);
    }

    @Override
    public ServiceInfo getInfo() {
        DefaultServiceInfo info = new DefaultServiceInfo();
        info.setDescription("DataStoreAdaptor " + this.name);
        info.setTitle(this.name.getLocalPart());
        return info;
    }

    private void ensureNotDisposed() throws IOException {
        if (this.source == null) {
            throw new IOException("DataStoreAdaptor is not available as it has been disposed");
        }
    }

    @Override
    public void dispose() {
        this.source = null;
        this.schema = null;
        this.name = null;
    }

    @Override
    public void createSchema(SimpleFeatureType featureType) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public void updateSchema(String typeName, SimpleFeatureType featureType) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public void removeSchema(String typeName) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public String[] getTypeNames() throws IOException {
        ensureNotDisposed();
        return new String[] {typeName};
    }

    @Override
    public SimpleFeatureType getSchema(String typeName) throws IOException {
        ensureNotDisposed();
        if (this.typeName.equals(typeName)) {
            return schema;
        }
        throw new IOException(
                "Not found: " + typeName + " DataStoreAdaptor datastore contains " + this.typeName);
    }

    @Override
    public LockingManager getLockingManager() {
        return new LockingManager() {

            @Override
            public void unLockFeatureID(
                    String typeName,
                    String authID,
                    Transaction transaction,
                    FeatureLock featureLock)
                    throws IOException {}

            @Override
            public boolean release(String authID, Transaction transaction) throws IOException {
                return false;
            }

            @Override
            public boolean refresh(String authID, Transaction transaction) throws IOException {
                return false;
            }

            @Override
            public void lockFeatureID(
                    String typeName,
                    String authID,
                    Transaction transaction,
                    FeatureLock featureLock)
                    throws IOException {}

            @Override
            public boolean exists(String authID) {
                return false;
            }
        };
    }

    @Override
    public FeatureWriter getFeatureWriterAppend(
            String typeName, Transaction transaction) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public FeatureWriter getFeatureWriter(
            String typeName, Transaction transaction) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public FeatureWriter getFeatureWriter(
            String typeName, Filter filter, Transaction transaction) throws IOException {
        throw new UnsupportedOperationException("DataStoreAdaptor does not support modification");
    }

    @Override
    public SimpleFeatureSource getFeatureSource(Name name) throws IOException {
        ensureNotDisposed();
        if (this.name.equals(name)) {
            return source;
        }
        throw new IOException("Not found: " + name + "DataStoreAdaptor contains " + this.typeName);
    }

    @Override
    public SimpleFeatureSource getFeatureSource(String typeName) throws IOException {
        ensureNotDisposed();
        if (this.typeName.equals(typeName)) {
            return source;
        }
        throw new IOException(
                "Not found: " + typeName + " DataStoreAdaptor contains " + this.typeName);
    }

    @Override
    public FeatureReader getFeatureReader(
            Query query, Transaction transaction) throws IOException {
        ensureNotDisposed();
        if (this.typeName.equals(query.getTypeName())) {
            return DataUtilities.reader(source.getFeatures());
        }
        throw new IOException(
                "Not found: "
                        + query.getTypeName()
                        + " DataStoreAdaptor contains "
                        + this.typeName);
    }
}