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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) 2002-2008, 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.feature;

import java.util.HashMap;
import java.util.Map;
import org.geotools.util.Utilities;
import org.opengis.feature.Property;
import org.opengis.feature.type.Name;
import org.opengis.feature.type.PropertyDescriptor;
import org.opengis.feature.type.PropertyType;

/**
 * Implementation of Property.
 *
 * @author Justin Deoliveira, The Open Planning Project
 */
public abstract class PropertyImpl implements Property {
    /** content of the property */
    protected Object value;
    /** descriptor of the property */
    protected PropertyDescriptor descriptor;
    /** user data */
    protected final Map userData;

    protected PropertyImpl(Object value, PropertyDescriptor descriptor) {
        this.value = value;
        this.descriptor = descriptor;
        userData = new HashMap();

        if (descriptor == null) {
            throw new NullPointerException("descriptor");
        }
    }

    public Object getValue() {
        return value;
    }

    public void setValue(Object value) {
        this.value = value;
    }

    public PropertyDescriptor getDescriptor() {
        return descriptor;
    }

    public Name getName() {
        return getDescriptor().getName();
    }

    public PropertyType getType() {
        return getDescriptor().getType();
    }

    public boolean isNillable() {
        return getDescriptor().isNillable();
    }

    public Map getUserData() {
        return userData;
    }

    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }

        if (!(obj instanceof PropertyImpl)) {
            return false;
        }

        PropertyImpl other = (PropertyImpl) obj;

        if (!Utilities.equals(descriptor, other.descriptor)) return false;

        if (!Utilities.deepEquals(value, other.value)) return false;

        return true;
    }

    public int hashCode() {
        return 37 * descriptor.hashCode() + (37 * (value == null ? 0 : value.hashCode()));
    }

    public String toString() {
        StringBuffer sb = new StringBuffer(getClass().getSimpleName()).append(":");
        sb.append(getDescriptor().getName().getLocalPart());
        sb.append("<");
        sb.append(getDescriptor().getType().getName().getLocalPart());
        sb.append(">=");
        sb.append(value);

        return sb.toString();
    }
}