Application: gvSIG desktop

import org.gvsig.fmap.dal.feature.LabelsCacheForFieldValues;

import org.gvsig.tools.task.SimpleTaskStatus;

import org.gvsig.tools.util.Invocable;

    public LabelsCacheForFieldValues createLabelsCacheForFieldValues(Invocable labelFormulaProvider, SimpleTaskStatus status);

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package org.gvsig.fmap.dal.feature;

/**

 *

 * @author jjdelcerro

 */

public interface LabelsCacheForFieldValues {

    String getLabelForFieldValue(Feature feature, String fieldName);

}

import org.gvsig.fmap.dal.feature.LabelsCacheForFieldValues;

import org.gvsig.fmap.dal.feature.impl.LabelsCacheForFieldValuesImpl;

import org.gvsig.tools.task.SimpleTaskStatus;

import org.gvsig.tools.util.Invocable;

    @Override

    public LabelsCacheForFieldValues createLabelsCacheForFieldValues(Invocable labelFormulaProvider, SimpleTaskStatus status) {

        LabelsCacheForFieldValuesImpl x = new LabelsCacheForFieldValuesImpl(labelFormulaProvider, status);

        return x;

    }

package org.gvsig.fmap.dal.feature.impl;

import org.gvsig.fmap.dal.feature.LabelsCacheForFieldValues;

import java.util.HashMap;

import java.util.Map;

import java.util.Objects;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.fmap.dal.feature.EditableForeingKey;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.tools.dynobject.DynObjectValueItem;

import org.gvsig.tools.task.SimpleTaskStatus;

import org.gvsig.tools.util.Invocable;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public class LabelsCacheForFieldValuesImpl implements LabelsCacheForFieldValues {

    protected static final Logger LOGGER = LoggerFactory.getLogger(LabelsCacheForFieldValuesImpl.class);

    private static final DynObjectValueItem[] INVALID_AVAILABLE_VALUES = new DynObjectValueItem[1];

    private final Map<String, DynObjectValueItem[]> availableValues;

    private final Invocable labelFormulaProvider;

    private final SimpleTaskStatus status;

    public LabelsCacheForFieldValuesImpl(Invocable labelFormulaProvider, SimpleTaskStatus status) {

        this.availableValues = new HashMap<>();

        this.labelFormulaProvider = labelFormulaProvider;

        this.status = status;

    }

    public LabelsCacheForFieldValuesImpl() {

        this(null, null);       

    }

    private void message(String msg) {

        if( this.status == null ) {

            return;

        }

        this.status.message(msg);

    }

    private DynObjectValueItem[] getAvailableValuesFromCache(String fieldName) {

        return this.availableValues.get(fieldName);

    }

    private void addAvailableValuesToCache(String fieldName, DynObjectValueItem[] values) {

        this.availableValues.put(fieldName, values);   

    }

    private boolean areValidAvailableValues(DynObjectValueItem[] values) {

        return values!=null && values!=INVALID_AVAILABLE_VALUES;

    }

    private void invalidateAvailableValuesInCache(String fieldName) {

        this.availableValues.put(fieldName, INVALID_AVAILABLE_VALUES);   

    }

    private String getAlternativeLabelFormula(FeatureType featureType, Feature feature, String fieldName) {

        if( this.labelFormulaProvider==null ) {

            return null;

        }

        String labelPhrase = (String) labelFormulaProvider.call(featureType,feature,fieldName);

//        FeatureAttributeDescriptor attr = featureType.getAttributeDescriptor(fieldName);

//        String labelPhrase = attr.getTags().getString(TAG_REPORT_ATTR_LABEL, null);

        return labelPhrase;

    }

    @Override

    public String getLabelForFieldValue(Feature feature, String fieldName) {

        FeatureStore store = feature.getStore();

        String availableValuesId = store.getFullName()+"/"+fieldName;

        String availableValuesLabelId = store.getName()+"/"+fieldName;

        DynObjectValueItem[] theAvailableValues = this.getAvailableValuesFromCache(availableValuesId);

        Object value = feature.get(fieldName);

        try {

            if (theAvailableValues==null) {

                FeatureType featureType = feature.getType();

                FeatureAttributeDescriptor attr = featureType.getAttributeDescriptor(fieldName);

                String labelFormula = this.getAlternativeLabelFormula(featureType, feature, fieldName);

                if (StringUtils.isBlank(labelFormula)) {

                    if (attr.hasAvailableValues()) {

                        message("Loading values for "+availableValuesLabelId);

                        this.addAvailableValuesToCache(availableValuesId, attr.getAvailableValues(null));

                    }

                } else { 

                    if (attr.isForeingKey()) {

                        EditableForeingKey fk;

                        try {

                            fk = (EditableForeingKey) attr.getForeingKey().clone();

                            fk.unbind();

                            fk.setLabelFormula(labelFormula);

                            message("Loading values for "+availableValuesLabelId);

                            this.addAvailableValuesToCache(availableValuesId, fk.getAvailableValues(null));

                        } catch (CloneNotSupportedException ex) {

                            LOGGER.warn("Not able to clone foreing key. "+ex.toString());

                        }

                    }

                }

                theAvailableValues = this.getAvailableValuesFromCache(availableValuesId);

            }

            if ( this.areValidAvailableValues(theAvailableValues) ) {

                for (DynObjectValueItem theAvailableValue : theAvailableValues) {

                    if (Objects.equals(value, theAvailableValue.getValue())) {

                        return theAvailableValue.getLabel();

                    }

                }

            }

        } catch (Exception ex) {

            LOGGER.warn("Fail", ex);

            this.invalidateAvailableValuesInCache(availableValuesId);

        }

        return Objects.toString(value);

    }

}