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 * This interface is a generic persistent parameter container. It is used in a variety 

 * of contexts in which a set of arbitrary parameters is needed.

public interface DataParameters extends Persistent {

	 * Returns the value of an attribute given its name.

	 * 

	 * @param name 

	 * 			of the attribute

	 * @return value of the attribute

	 */

	public Object getAttribute(String name);

	/**

	 * Sets the value of an attribute

	 * 

	 * @param name of the attribute, if it exists it is overwritten, if it does not exist it 

	 * 			is added to the container.

	 * @param value attribute's value

	 * @return this

	 */

	public DataParameters setAttribute(String name, Object value);

	/**

import java.util.HashMap;

import java.util.Map;

import org.gvsig.fmap.dal.DataParameterDescriptor;

	private Map params;

	private Map alias;

	public class DefaultDataParameter implements DataParameterDescriptor {

		private int dataType;

		private String name;

		private Object defaultValue;

		private int availableValuesType;

		private Object[] availableValues;

		private Object minValue;

		private Object maxValue;

		Object value;

		private String description;

		DefaultDataParameter(String name, int dataType, String description,

				Object defaultValue) {

			this.name = name;

			this.description = description;

			this.dataType = dataType;

			this.defaultValue = defaultValue;

			this.availableValuesType = SINGLE;

			this.minValue = null;

			this.maxValue = null;

			this.availableValues = null;

			this.value = defaultValue;

		}

		DefaultDataParameter(String name, int dataType, String description,

				Object defaultValue, Object[] avaliableValues) {

			this.name = name;

			this.description = description;

			this.dataType = dataType;

			this.defaultValue = defaultValue;

			this.availableValuesType = CHOICE;

			this.availableValues = avaliableValues;

			this.minValue = null;

			this.maxValue = null;

			this.value = defaultValue;

		}

		DefaultDataParameter(String name, int dataType, String description,

				Object defaultValue, Object minValue, Object maxValue) {

			this.name = name;

			this.description = description;

			this.dataType = dataType;

			this.defaultValue = defaultValue;

			this.availableValuesType = RANGE;

			this.availableValues = null;

			this.minValue = minValue;

			this.maxValue = maxValue;

			this.value = defaultValue;

		}

		public Object[] getAvailableValues() {

			return this.availableValues;

		}

		public Object getDefaultValue() {

			return this.defaultValue;

		}

		public String getName() {

			return this.name;

		}

		public int getDataType() {

			return this.dataType;

		}

		void clear() {

			value = defaultValue;

		}

		Object getValue() {

			return value;

		}

		void setValue(Object value) {

			// FIXME: hacer comprobaciones de tipos.

			this.value = value;

		}

		public int getAvailableValuesType() {

			return this.availableValuesType;

		}

		public String getDescription() {

			return this.description;

		}

		public Object getMaxValue() {

			return this.maxValue;

		}

		public Object getMinValue() {

			return this.minValue;

		}

	public AbstractDataParameters() {

		this.params = new HashMap();

		this.alias = new HashMap();

	protected DataParameterDescriptor addParameter(String name, int dataType,

			String description, Object defaultValue) {

		this.params.put(name.toLowerCase(), new DefaultDataParameter(name,

				dataType,

				description, defaultValue));

		return null;

	}

	protected DataParameterDescriptor addParameter(String name, int dataType,

			String description, Object defaultValue, Object[] avaliableValues) {

		this.params.put(name.toLowerCase(), new DefaultDataParameter(name,

				dataType,

				description,

				defaultValue, avaliableValues));

		return null;

	}

	protected DataParameterDescriptor addParameter(String name, int dataType,

			String description, Object defaultValue, Object minValue,

			Object maxValue) {

		this.params.put(name, new DefaultDataParameter(name, dataType,

				description, defaultValue, minValue, maxValue));

		return null;

	}

	public DataParameterDescriptor addAttributeAlias(String name, String alias) {

		Object param = this.params.get(name);

		if( param == null  ){

			return null ;

		this.alias.put(alias, param);

		return (DataParameterDescriptor) param;

	public Object getAttribute(String name) {

		return ((DefaultDataParameter) this.params.get(name.toLowerCase()))

				.getValue();

	}

	public DataParameters setAttribute(String name, Object value) {

		((DefaultDataParameter) this.params.get(name.toLowerCase()))

				.setValue(value);

		return this;

	}

	public void clear() {

		Iterator it = params.values().iterator();

		while (it.hasNext()) {

			((DefaultDataParameter) it.next()).clear();

	public Iterator getAttributes() {

		return params.values().iterator();

	}

	protected void copyValuesTo(AbstractDataParameters target) {

		Iterator it = params.values().iterator();

		while (it.hasNext()) {

			DefaultDataParameter p = ((DefaultDataParameter) it.next());

			target.setAttribute(p.getName(), p.getValue());

		}

	}

		Iterator it = params.values().iterator();

		while (it.hasNext()) {

			DefaultDataParameter p = ((DefaultDataParameter) it.next());

			state.set(p.getName(), p.getValue());

				this.setAttribute(name, state.get(name));

		this.loadState(state);