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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2003-2005, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.parameter;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;

import java.util.List;
import org.opengis.annotation.Extension;
import org.opengis.annotation.UML;
import org.opengis.metadata.Identifier;

/**
 * The definition of a group of related parameters used by an operation method.
 *
 * @version Abstract
 *     specification 2.0
 * @author Martin Desruisseaux (IRD)
 * @author Jody Garnett (Refractions Research)
 * @since GeoAPI 2.0
 * @see ParameterValueGroup
 * @see ParameterDescriptor
 */
@UML(identifier = "CC_OperationParameterGroup", specification = ISO_19111)
public interface ParameterDescriptorGroup extends GeneralParameterDescriptor {
    /**
     * Creates a new instance of {@linkplain ParameterValueGroup parameter value group} initialized
     * with the {@linkplain ParameterDescriptor#getDefaultValue default values}. The {@linkplain
     * ParameterValueGroup#getDescriptor parameter value descriptor} for the created group will be
     * {@code this} object.
     *
     * The number of {@link ParameterValue} objects included must be between the {@linkplain
     * ParameterDescriptor#getMinimumOccurs minimum} and {@linkplain
     * ParameterDescriptor#getMaximumOccurs maximum occurences} required. For example:
     *
     * 

     *   For {@link ParameterDescriptor} with cardinality 1:* a {@link ParameterValue} will be
     *       included with the {@linkplain ParameterDescriptor#getDefaultValue default value} (even
     *       if this default value is null).
     *   
For {@link ParameterDescriptor} with cardinality 0:* no entry is required. {@link
     *       ParameterValue} entries may be created only as needed.
     * 
     *
     * @return A new parameter instance initialized to the default value.
     */
    @Extension
    ParameterValueGroup createValue();

    /**
     * Returns the parameters in this group.
     *
     * @return The descriptor of this group.
     */
    @UML(identifier = "includesParameter", obligation = MANDATORY, specification = ISO_19111)
    List descriptors();

    /**
     * Returns the parameter descriptor in this group for the specified {@linkplain
     * Identifier#getCode identifier code}.
     *
     * @param name The case insensitive {@linkplain Identifier#getCode identifier code} of the
     *     parameter to search for.
     * @return The parameter for the given identifier code.
     * @throws ParameterNotFoundException if there is no parameter for the given identifier code.
     */
    @Extension
    GeneralParameterDescriptor descriptor(String name) throws ParameterNotFoundException;
}