/**
 *
 */
package de.intevation.gnv.state;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.xml.xpath.XPathConstants;

import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import de.intevation.artifactdatabase.Config;
import de.intevation.artifactdatabase.XMLUtils;
import de.intevation.artifacts.ArtifactNamespaceContext;
import de.intevation.artifacts.CallContext;
import de.intevation.artifacts.CallMeta;
import de.intevation.gnv.artifacts.GNVArtifactBase;
import de.intevation.gnv.artifacts.cache.CacheFactory;
import de.intevation.gnv.artifacts.ressource.RessourceFactory;
import de.intevation.gnv.geobackend.base.Result;
import de.intevation.gnv.geobackend.base.query.QueryExecutor;
import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
import de.intevation.gnv.geobackend.base.query.exception.QueryException;
import de.intevation.gnv.geobackend.util.DateUtils;
import de.intevation.gnv.state.describedata.DefaultKeyValueDescribeData;
import de.intevation.gnv.state.describedata.KeyValueDescibeData;
import de.intevation.gnv.state.describedata.MinMaxDescribeData;
import de.intevation.gnv.state.describedata.NamedArrayList;
import de.intevation.gnv.state.describedata.NamedCollection;
import de.intevation.gnv.state.describedata.SingleValueDescribeData;
import de.intevation.gnv.state.exception.StateException;
import de.intevation.gnv.utils.InputValidator;

/**
 * @author Tim Englich         (tim.englich@intevation.de)
 * @author Ingo Weinzierl      (ingo.weinzierl@intevation.de)
 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
 */
public abstract class StateBase implements State {

    /**
     * The UID of this Class
     */
    private static final long serialVersionUID = 2411169179001645426L;

    /**
     * the logger, used to log exceptions and additonaly information
     */
    private static Logger log = Logger.getLogger(GNVArtifactBase.class);
    
    private final static String MINVALUEFIELDNAME = "minvalue";
    private final static String MAXVALUEFIELDNAME = "maxvalue";
    
    private final static String NODATASELECTIONKEY = "n/n";
    
    public final static String DESCRIBEDATAKEY = "_DESCRIBEDATA";

    public final static String XPATH_STATIC_UI  = "art:static";
    public final static String XPATH_DYNAMIC_UI = "art:dynamic";

    private String id = null;

    private String description = null;

    protected String dataName = null;
    
    protected String preSettingsName = null;

    protected boolean dataMultiSelect = false;
    
    protected boolean dataNoSelect = false;

    protected String queryID = null;

    protected Collection<String> inputValueNames = null;

    private Map<String, InputValue> inputValues = null;

    private State parent = null;

    protected Map<String, InputData> inputData = null;
    
    private Map<String, InputData> preSettings = null;

    /**
     * Constructor
     */
    public StateBase() {
        super();
    }

    /**
     * @see de.intevation.gnv.state.State#getID()
     */
    public String getID() {
        return this.id;
    }

    /**
     * @see de.intevation.gnv.state.State#getDescription()
     */
    public String getDescription() {
        return this.description;
    }



    /**
     * @see de.intevation.gnv.state.State#getRequiredInputValues()
     */
    public Collection<InputValue> getRequiredInputValues() {
        return this.inputValues.values();
    }


    public void reset(String uuid) {
        
        if (parent != null) {
            inputData = parent.inputData();
        }
    }


    /**
     * @see de.intevation.gnv.state.State#setup(org.w3c.dom.Node)
     */
    public void setup(Node configuration) {
        log.debug("StateBase.setup");
        this.id = ((Element)configuration).getAttribute("id");
        this.description = ((Element)configuration).getAttribute("description");

        log.info("State-ID = " + this.id);
        
        NodeList inputValuesNodes = Config.getNodeSetXPath(configuration,
                "inputvalues/inputvalue");
        this.inputValues = new HashMap<String, InputValue>(inputValuesNodes
                .getLength());
        this.inputValueNames = new ArrayList<String>(inputValuesNodes
                .getLength());
        for (int i = 0; i < inputValuesNodes.getLength(); i++) {
            Element inputValueNode = (Element)inputValuesNodes.item(i);
            String usedinQueryValue = inputValueNode.getAttribute("usedinquery");
            int usedinQuery = 1;
            if (usedinQueryValue != null) {
                try {
                    usedinQuery = Integer.parseInt(usedinQueryValue);
                } catch (NumberFormatException e) {
                    log
                            .warn("Used in Query Value cannot be transformed into a Number");
                }
            }
            InputValue inputValue = new DefaultInputValue(inputValueNode.getAttribute("name"), 
                                                          inputValueNode.getAttribute("type"), 
                                                          Boolean.parseBoolean(inputValueNode.
                                                          getAttribute("multiselect")), usedinQuery);
            log.debug(inputValue.toString());
            this.inputValues.put(inputValue.getName(), inputValue);
            this.inputValueNames.add(inputValue.getName());
        }

        this.queryID = Config.getStringXPath(configuration, "queryID");
        log.info("QueryID ==> " + this.queryID);

        this.dataName = Config.getStringXPath(configuration, "dataname");

        String dataMultiSelectValue = Config.getStringXPath(configuration,
                                                           "data-multiselect");
        if (dataMultiSelectValue != null) {
            this.dataMultiSelect = Boolean.parseBoolean(dataMultiSelectValue);
        }
        
        String dataNoSelectValue =Config.getStringXPath(configuration,
                                                        "data-noselect");
        if (dataNoSelectValue != null) {
            this. dataNoSelect = Boolean.parseBoolean(dataNoSelectValue);
        }
        
        this.preSettingsName = Config.getStringXPath(configuration, "presettings-name"); 
        
    }

    /**
     * @see de.intevation.gnv.state.State#getParent()
     */
    public State getParent() {
        return this.parent;
    }

    /**
     * @see de.intevation.gnv.state.State#setParent(de.intevation.gnv.state.State)
     */
    public void setParent(State state) {
        this.parent = state;
    }

    /**
     * @see de.intevation.gnv.state.State#putInputData(java.util.Collection)
     */
    public void putInputData(Collection<InputData> inputData, String uuid)
                                                                          throws StateException {
        log.debug("StateBase.putInputData");
        if (inputData != null) {
            Iterator<InputData> it = inputData.iterator();
            InputValidator iv = new InputValidator();
            while (it.hasNext()) {
                InputData tmpItem = it.next();
                InputValue inputValue = this.inputValues.get(tmpItem.getName());
                if (inputValue != null) {
                    if (this.inputData == null) {
                        this.inputData = new HashMap<String, InputData>(
                                inputData.size());
                    }
                    
                    boolean valid = iv.isInputValid(tmpItem.getValue(),
                            inputValue.getType());
                    if (valid) {
                        if (tmpItem.getName().equals(MINVALUEFIELDNAME)){
                            String minValue = tmpItem.getValue();
                            String maxValue = this.getInputValue4ID(inputData, MAXVALUEFIELDNAME);
                            valid = iv.isInputValid(maxValue,inputValue.getType());
                            if (!valid){
                                String errMsg = "Wrong input for " + tmpItem.getValue()
                                                + " is not an " + inputValue.getType()
                                                + " Value.";
                                log.warn(errMsg);
                                throw new StateException(errMsg);
                            }
                            
                            valid = iv.isInputValid(minValue, 
                                    maxValue,
                                    inputValue.getType());
                            if (!valid){
                                String errMsg = "MaxValue-Input is less than MinValue-Input ";
                                log.warn(errMsg);
                                throw new StateException(errMsg);
                            }
                        }else if (tmpItem.getName().equals(MAXVALUEFIELDNAME)){
                            String minValue = this.getInputValue4ID(inputData, MINVALUEFIELDNAME);
                            String maxValue = tmpItem.getValue();
                            valid = iv.isInputValid(minValue,inputValue.getType());
                            if (!valid){
                                String errMsg = "Wrong input for " + tmpItem.getValue()
                                                + " is not an " + inputValue.getType()
                                                + " Value.";
                                log.warn(errMsg);
                                throw new StateException(errMsg);
                            }
                            
                            valid = iv.isInputValid(minValue, 
                                                    maxValue,
                                                    inputValue.getType());
                            if (!valid){
                                String errMsg = "MaxValue-Input is less than MinValue-Input ";
                                log.warn(errMsg);
                                throw new StateException(errMsg);
                            }
                        }
                        this.setSelection(tmpItem, uuid);
                        this.inputData.put(tmpItem.getName(), tmpItem);
                    } else {
                        String errMsg = "Wrong input for " + tmpItem.getValue()
                                        + " is not an " + inputValue.getType()
                                        + " Value.";
                        log.warn(errMsg);
                        throw new StateException(errMsg);
                    }

                } else {
                    String errMsg = "No Inputvalue given for Inputdata "
                                    + tmpItem.getName();
                    log.warn(errMsg + "Value will be ignored");

                }
            }
        } else {
            log.warn("No Inputdata given");
        }
    }

    /**
     * 
     * @see de.intevation.gnv.state.State#setPreSettings(java.util.Map)
     */
    public void setPreSettings(Map<String, InputData> preSettings) {
        this.preSettings = preSettings;
    }

    private String getInputValue4ID(Collection<InputData> inputData, String inputName){
        Iterator<InputData> it = inputData.iterator();
        while (it.hasNext()) {
            InputData tmpItem = it.next();
            if (tmpItem.getName().equals(inputName)){
                return tmpItem.getValue();
            }
        }
        return null;
    }

    private void setSelection(InputData inputData, String uuid) {
        log.debug("StateBase.setSelection");

        Object o = this.getDescribeData(inputData.getName(),uuid);
        if (o != null) {
            if (o instanceof Collection<?>) {
                Collection<KeyValueDescibeData> values = (Collection<KeyValueDescibeData>) o;

                String value = inputData.getValue();
                String[] selectedValues = value.split(",");
                Set<String> selectedItems = new HashSet<String>(
                        selectedValues.length);
                for (int i = 0; i < selectedValues.length; i++) {
                    selectedItems.add(selectedValues[i].trim());
                }
                // Selektion umsetzen
                Iterator<KeyValueDescibeData> it = values.iterator();
                while (it.hasNext()) {
                    KeyValueDescibeData data = it.next();
                    String key = "" + data.getKey();
                    boolean selected = selectedItems.contains(key);
                    data.setSelected(selected);
                }
            } else if (o instanceof MinMaxDescribeData) {
                MinMaxDescribeData data = (MinMaxDescribeData) o;
                if (inputData.getName().equals(MINVALUEFIELDNAME)) {
                    data.setMinValue(inputData.getValue());
                }
                if (inputData.getName().equals(MAXVALUEFIELDNAME)) {
                    data.setMaxValue(inputData.getValue());
                }
            } else if (o instanceof SingleValueDescribeData) {
                ((SingleValueDescribeData)o).setValue(inputData.getValue());
            }
        }
    }

    private Object getDescribeData(String name, String uuid) {
        log.debug("StateBase.getDescribeData");
        Collection<Object> descibeData = this.getDescibeData(uuid);
        if (descibeData != null) {
            Iterator<Object> it = descibeData.iterator();
            while (it.hasNext()) {
                Object o = it.next();
                if (o instanceof NamedCollection<?>) {
                    if (name.equals(((NamedCollection<?>) o).getName())) {
                        return o;
                    }
                } else if (o instanceof MinMaxDescribeData) {
                    if (name.equals(((MinMaxDescribeData) o).getMinName())) {
                        return o;
                    }
                    if (name.equals(((MinMaxDescribeData) o).getMaxName())) {
                        return o;
                    }
                }else if (o instanceof SingleValueDescribeData) {
                    if (name.equals(((SingleValueDescribeData)o).getName())){
                        return o;
                    }
                }
            }
        }
        return null;
    }

    /**
     * @see de.intevation.gnv.state.State#advance(java.lang.String,
     *      de.intevation.artifacts.CallMeta)
     */
    public void advance(String uuid, CallContext context)
    throws StateException
    {
    }
    
    public void initialize(String uuid, CallContext context)
    throws StateException
    {
        log.debug("StateBase.initialize");
        try {
            String[] filterValues = this
                    .generateFilterValuesFromInputData();
            Collection<Result> result = null;
            try {
                if (this.queryID != null) {
                    QueryExecutor queryExecutor = QueryExecutorFactory
                            .getInstance().getQueryExecutor();
                    result = queryExecutor.executeQuery(this.queryID,
                            filterValues);
                }
                this.purifyResult(result, uuid);
            } catch (RuntimeException e) {
                log.error(e, e);
            }
        } catch (QueryException e) {
            log.error(e, e);
            throw new StateException(e);
        }
    }

    /**
     * @return
     */
    protected String[] generateFilterValuesFromInputData() {
        List<String> list = new ArrayList<String>();
        Iterator<String> it = this.inputValueNames.iterator();
        while (it.hasNext()) {
            String value = it.next();
            InputData data = this.inputData.get(value);
            if (data != null
                && this.inputValues.containsKey(data.getName())) {
                int size = this.inputValues.get(data.getName())
                        .usedInQueries();
                String type = this.inputValues.get(data.getName())
                        .getType();
                String requestValue = data.getValue();
                if (type.equalsIgnoreCase("string")) {
                    requestValue = this
                            .prepareInputData4DBQuery(requestValue);
                } else if (type.equalsIgnoreCase("date")) {
                    requestValue = this
                            .prepareInputData4DateDBQuery(requestValue);
                } else if (type.equalsIgnoreCase("coordinate")){
                    requestValue = this
                    .prepareInputData4RegionDBQuery(requestValue);
                }
                for (int j = 0; j < size; j++) {
                    list.add(requestValue);
                }
            }
        }
        String[] filterValues = list.toArray(new String[list.size()]);
        return filterValues;
    }
    
    protected String prepareInputData4RegionDBQuery(String value){
        return value;
    }

    private String prepareInputData4DateDBQuery(String value) {
        log.debug("StateBase.prepareInputData4DateDBQuery");
        if (value != null) {
            String[] values = value.split(",");
            String newValue = "";
            for (int i = 0; i < values.length; i++) {
                if (newValue.length() > 0) {
                    newValue = newValue + " , ";
                }
                // TODO JUST HACK FIND A BETTER RESOLUTION
                newValue = newValue + "to_date('" + values[i].trim()
                           + "', 'YYYY.MM.DD HH24:MI:SS')";
            }
            return newValue;
        }

        return value;
    }

    private String prepareInputData4DBQuery(String value) {
        log.debug("StateBase.prepareInputData4DBQuery");
        if (value != null) {
            String[] values = value.split(",");
            String newValue = "";
            for (int i = 0; i < values.length; i++) {
                if (newValue.length() > 0) {
                    newValue = newValue + " , ";
                }
                newValue = newValue + "'" + values[i].trim() + "'";
            }
            return newValue;
        }

        return value;

    }

    /**
     * @param result
     */
    protected void purifyResult(Collection<Result> result, String uuid) {
        log.debug("StateBase.purifyResult");
        List<Object> describeData = this.getDescibeData(uuid);
        if (describeData == null) {
            describeData = new ArrayList<Object>();
        }
        NamedCollection<KeyValueDescibeData> keyValueDescibeData = extractKVP(result, "KEY", "VALUE");
        describeData.add(keyValueDescibeData); 
        this.setDescibeData(uuid, describeData);
    }

    /**
     * @param result
     * @return
     */
    protected NamedCollection<KeyValueDescibeData> extractKVP(Collection<Result> result,
                                                              String keyid,
                                                              String valueid) {
        Iterator<Result> rit = result.iterator();
        int dataSize = (this.dataNoSelect ? result.size()+1 : result.size());
        
        NamedCollection<KeyValueDescibeData> keyValueDescibeData = new NamedArrayList<KeyValueDescibeData>(
                this.dataName, dataSize);
        keyValueDescibeData.setMultiSelect(this.dataMultiSelect);
        
        if (this.dataNoSelect){
            keyValueDescibeData.add(new DefaultKeyValueDescribeData(
                NODATASELECTIONKEY,
                "No Selection",
                getID()
            ));
        }

        boolean initialized = false;
        int     keyPos      = 0;
        int     valuePos    = 1;
        String  previousKey = null;
        InputData preSettingsData = (this.preSettings != null && 
                                    this.preSettingsName != null) ? 
                                    this.preSettings.get(this.preSettingsName) :
                                    null;
        boolean filterWithPresettings = preSettingsData != null;
        
        List<String> preSettingValues = null;
        if(filterWithPresettings){
            preSettingValues = Arrays.asList(preSettingsData.splitValue());
        }
        while (rit.hasNext()) {
            Result resultValue = rit.next();
            if (!initialized){
                keyPos = resultValue.getResultDescriptor().getColumnIndex(keyid);
                valuePos = resultValue.getResultDescriptor().getColumnIndex(valueid);
                if (valuePos < 0){
                    valuePos = 1;
                }
                initialized = true;
            }
            String tmpKey = resultValue.getString(keyPos);
           
            // TODO: FIXME: We have to do that because the arcsde does not 
            //       support a distinct Query on Layers.
            if (previousKey == null || !tmpKey.equals(previousKey)){
                previousKey = tmpKey;
                if (!filterWithPresettings || preSettingValues.contains(tmpKey)){
                    keyValueDescibeData.add(
                            new DefaultKeyValueDescribeData(
                                                tmpKey, 
                                                resultValue.getString(valuePos),
                                                getID())
                                );
                }
            }
        }
        return keyValueDescibeData;
    }

    /**
     * @see de.intevation.gnv.state.State#describe(org.w3c.dom.Document,
     *      org.w3c.dom.Node, de.intevation.artifacts.CallMeta,
     *      java.lang.String)
     */
    public void describe(
        Document    document,
        Node        rootNode,
        CallContext context,
        String      uuid
    ) {
        log.debug("StateBase.describe");
        CallMeta callMeta = context.getMeta();

        List<Object> descibeData = this.getDescibeData(uuid);
        if (descibeData != null) {
            Iterator<Object> it = descibeData.iterator();

            XMLUtils.ElementCreator creator = new XMLUtils.ElementCreator(
                document,
                ArtifactNamespaceContext.NAMESPACE_URI,
                ArtifactNamespaceContext.NAMESPACE_PREFIX
            );

            Node staticNode = (Node) XMLUtils.xpath(
                rootNode,
                XPATH_STATIC_UI,
                XPathConstants.NODE,
                ArtifactNamespaceContext.INSTANCE
            );

            Node dynamic = (Node) XMLUtils.xpath(
                rootNode,
                XPATH_DYNAMIC_UI,
                XPathConstants.NODE,
                ArtifactNamespaceContext.INSTANCE
            );

            XMLUtils.ElementCreator xCreator = new XMLUtils.ElementCreator(
                document,
                XMLUtils.XFORM_URL,
                XMLUtils.XFORM_PREFIX
            );

            while (it.hasNext()) {
                Object o = it.next();
                if ((!it.hasNext() && dataName != null)) {
                    appendToDynamicNode(
                        creator, xCreator, document, dynamic, callMeta, o);
                }
                else {
                    appendToStaticNode(
                        creator, xCreator, document, staticNode, callMeta, o);
                }
            }
        }
    }


    protected void appendToStaticNode(
        XMLUtils.ElementCreator artCreator,
        XMLUtils.ElementCreator creator,
        Document                document,
        Node                    staticNode,
        CallMeta                callMeta,
        Object                  o
    ) {
        if (o instanceof Collection<?>) {
            String name = null;
            boolean multiselect = false;
            if (o instanceof NamedCollection<?>) {
                NamedCollection<?> nc = ((NamedCollection<?>) o);
                name = nc.getName();
                multiselect = nc.isMultiSelect();
            } else {
                Object[] names = this.inputValueNames.toArray();
                name = names[names.length - 1].toString();
            }

            Element selectNode = creator.create(multiselect?"select":"select1");
            creator.addAttr(selectNode, "ref", name);

            Element lableNode = creator.create("label");
            lableNode.setTextContent(RessourceFactory.getInstance()
                    .getRessource(callMeta.getLanguages(), name, name));
            Element choiceNode = creator.create("choices");

            Collection<KeyValueDescibeData> values = (Collection<KeyValueDescibeData>) o;
            Iterator<KeyValueDescibeData> resultIt = values.iterator();
            while (resultIt.hasNext()) {
                KeyValueDescibeData result = resultIt.next();

                if (result.isSelected()) {
                    artCreator.addAttr(
                        selectNode, "state", result.getState(), true
                    );

                    Element itemNode = creator.create("item");

                    creator.addAttr(itemNode, "selected", "true");

                    Element choiceLableNode = creator.create("label");
                    choiceLableNode.setTextContent(result.getValue());
                    itemNode.appendChild(choiceLableNode);

                    Element choiceValueNode = creator.create("value");
                    choiceValueNode.setTextContent("" + result.getKey());
                    itemNode.appendChild(choiceValueNode);
                    choiceNode.appendChild(itemNode);
                }
            }
            selectNode.appendChild(lableNode);
            selectNode.appendChild(choiceNode);

            staticNode.appendChild(selectNode);
        }
        else if (o instanceof MinMaxDescribeData) {
            appendMinMaxDescribeData(
                artCreator,
                creator,
                document,
                staticNode,
                callMeta,
                o);
        }
        else if (o instanceof SingleValueDescribeData) {
            appendSingleValueDescribeData(
                artCreator,
                creator,
                document,
                staticNode,
                callMeta,
                o);
        }
    }


    protected void appendToDynamicNode(
        XMLUtils.ElementCreator artCreator,
        XMLUtils.ElementCreator creator,
        Document                document,
        Node                    dynamicNode,
        CallMeta                callMeta,
        Object                  o
    ) {
        if (o instanceof Collection<?>) {
            String name = null;
            boolean multiselect = false;
            if (o instanceof NamedCollection<?>) {
                NamedCollection<?> nc = ((NamedCollection<?>) o);
                name = nc.getName();
                multiselect = nc.isMultiSelect();
            } else {
                Object[] names = this.inputValueNames.toArray();
                name = names[names.length - 1].toString();
            } 

            Element selectNode = creator.create(multiselect?"select":"select1");
            creator.addAttr(selectNode, "ref", name);

            Element lableNode = creator.create("label");
            lableNode.setTextContent(RessourceFactory.getInstance()
                    .getRessource(callMeta.getLanguages(), name, name));
            Element choiceNode = creator.create("choices");

            Collection<KeyValueDescibeData> values = (Collection<KeyValueDescibeData>) o;
            Iterator<KeyValueDescibeData> resultIt = values.iterator();
            while (resultIt.hasNext()) {
                KeyValueDescibeData result = resultIt.next();
                Element itemNode = creator.create("item");

                if (result.isSelected()) {
                    itemNode.setAttribute("selected", "true");
                }

                Element choiceLableNode = creator.create("label");
                choiceLableNode.setTextContent(result.getValue());
                itemNode.appendChild(choiceLableNode);

                Element choicValueNode = creator.create("value");
                choicValueNode.setTextContent("" + result.getKey());
                itemNode.appendChild(choicValueNode);
                choiceNode.appendChild(itemNode);
            }
            selectNode.appendChild(lableNode);
            selectNode.appendChild(choiceNode);

            dynamicNode.appendChild(selectNode);
        }
        else if (o instanceof MinMaxDescribeData) {
            appendMinMaxDescribeData(
                artCreator,
                creator,
                document,
                dynamicNode,
                callMeta,
                o);
        }
        else if (o instanceof SingleValueDescribeData) {
            appendSingleValueDescribeData(
                artCreator,
                creator,
                document,
                dynamicNode,
                callMeta,
                o);
        }
    }


    protected void appendMinMaxDescribeData(
        XMLUtils.ElementCreator artCreator,
        XMLUtils.ElementCreator creator,
        Document                document,
        Node                    node,
        CallMeta                callMeta,
        Object                  o
    ) {
        MinMaxDescribeData minMaxDescibeData = (MinMaxDescribeData) o;
        Object min = minMaxDescibeData.getMinValue();
        Object max = minMaxDescibeData.getMaxValue();
        if (min instanceof GregorianCalendar) {
            Date d = ((GregorianCalendar) min).getTime();
            min = DateUtils.getPatternedDateAmer(d);
        }

        if (max instanceof GregorianCalendar) {
            Date d = ((GregorianCalendar) max).getTime();
            max = DateUtils.getPatternedDateAmer(d);
        }

        Element groupNode = creator.create("group");
        artCreator.addAttr(groupNode, "state", minMaxDescibeData.getState(), true);

        creator.addAttr(groupNode, "ref", minMaxDescibeData.getName());
        Element groupNodeLableNode = creator.create("label");
        groupNodeLableNode.setTextContent(RessourceFactory
                .getInstance().getRessource(
                        callMeta.getLanguages(),
                        minMaxDescibeData.getName(),
                        minMaxDescibeData.getName()));
        groupNode.appendChild(groupNodeLableNode);

        Element inputMinNode = creator.create("input");
        creator.addAttr(inputMinNode, "ref", MINVALUEFIELDNAME);
        Element inputMinLableNode = creator.create("label");
        inputMinLableNode.setTextContent(RessourceFactory
                .getInstance().getRessource(
                        callMeta.getLanguages(), MINVALUEFIELDNAME,
                        MINVALUEFIELDNAME));
        inputMinNode.appendChild(inputMinLableNode);

        Element inputMinValueNode = creator.create("value");
        inputMinValueNode.setTextContent(min.toString());
        inputMinNode.appendChild(inputMinValueNode);

        Element inputMaxNode = creator.create("input");
        creator.addAttr(inputMaxNode, "ref", MAXVALUEFIELDNAME);
        Element inputMaxLableNode = creator.create("label");
        inputMaxLableNode.setTextContent(RessourceFactory
                .getInstance().getRessource(
                        callMeta.getLanguages(), MAXVALUEFIELDNAME,
                        MAXVALUEFIELDNAME));
        inputMaxNode.appendChild(inputMaxLableNode);

        Element inputMaxValueNode = creator.create("value");
        inputMaxValueNode.setTextContent(max.toString());
        inputMaxNode.appendChild(inputMaxValueNode);

        groupNode.appendChild(inputMinNode);
        groupNode.appendChild(inputMaxNode);

        node.appendChild(groupNode);
    }


    protected void appendSingleValueDescribeData(
        XMLUtils.ElementCreator artCreator,
        XMLUtils.ElementCreator creator,
        Document                document,
        Node                    node,
        CallMeta                callMeta,
        Object                  o
    ) {
        SingleValueDescribeData svdb = (SingleValueDescribeData) o;

        Element groupNode = creator.create("group");
        artCreator.addAttr(groupNode, "state", svdb.getState(), true);
        creator.addAttr(groupNode, "ref",  svdb.getName());

        Element groupNodeLableNode = creator.create("label");
        groupNodeLableNode.setTextContent(RessourceFactory
                .getInstance().getRessource(
                        callMeta.getLanguages(),
                        svdb.getName(),
                        svdb.getName()));
        groupNode.appendChild(groupNodeLableNode);

        Element inputNode = creator.create("input");
        creator.addAttr(inputNode, "ref", svdb.getName());

        Element inputLableNode = creator.create("label");
        inputLableNode.setTextContent("");
        inputNode.appendChild(inputLableNode);

        Element inputValueNode = creator.create("value");
        inputValueNode.setTextContent(svdb.getValue());
        inputNode.appendChild(inputValueNode);

        groupNode.appendChild(inputNode);

        node.appendChild(groupNode);
    }

    /**
     * @see de.intevation.gnv.state.State#getDescibeData()
     */
    protected List<Object> getDescibeData(String uuid) {
        if (CacheFactory.getInstance().isInitialized()) {
            String key = uuid + DESCRIBEDATAKEY;
            log.debug("Hash for Queryelements: " + key);
            net.sf.ehcache.Element value = CacheFactory.getInstance().getCache().get(key);
            if (value != null) {
                return (List<Object>) (value.getObjectValue());
            }
        }
        return null;
    }
    
    /**
     * @see de.intevation.gnv.state.State#getDescibeData()
     */
    protected void setDescibeData(String uuid, List<Object> describeData) {
        
        if (CacheFactory.getInstance().isInitialized()) {
            String key = uuid + DESCRIBEDATAKEY;
            log.debug("Hash for Queryelements: " + key);
            CacheFactory.getInstance().getCache().put(new net.sf.ehcache.Element(key, describeData));
        }
    }

    public Map<String, InputData> inputData() {
        return inputData;
    }

    /**
     * @see de.intevation.gnv.state.State#getInputData()
     */
    public Collection<InputData> getInputData() throws StateException {
        return this.inputData != null ? this.inputData.values() : null;
    }

    public void endOfLife(Object globalContext) {
    }
}
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