Application: gvSIG desktop

package org.gvsig.fmap.dal.swing.impl.expressionevaluator.suggestions;

import java.util.Collections;

import org.apache.commons.lang.StringUtils;

import org.apache.commons.lang3.RandomUtils;

import org.apache.commons.lang3.mutable.MutableObject;

import org.gvsig.expressionevaluator.Code;

import org.gvsig.expressionevaluator.ExpressionUtils;

import org.gvsig.expressionevaluator.swing.SuggestionProvider;

import org.gvsig.fmap.dal.exception.DataException;

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

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

import org.gvsig.tools.ToolsLocator;

import org.gvsig.tools.i18n.I18nManager;

import org.gvsig.tools.util.Factory;

import org.gvsig.tools.visitor.VisitCanceledException;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public class StorePointFieldSuggestionProviderFactory implements Factory {

  private static long lastSuggestedTime = 0;

  private final FeatureStore store;

  private boolean suggestionApplies;

  public StorePointFieldSuggestionProviderFactory(FeatureStore store) {

    this.store = store;

    String storename = store.getName();

    this.suggestionApplies = false;

    for (FeatureAttributeDescriptor attr : getFeatureAttributeDescriptors() ) {

      if (StringUtils.equalsIgnoreCase(storename, attr.getName())) {

        this.suggestionApplies = true;

        break;

      }

    }

  }

  private Iterable<FeatureAttributeDescriptor> getFeatureAttributeDescriptors() {

    try {

      return this.store.getDefaultFeatureType();

    } catch (DataException ex) {

      return Collections.EMPTY_LIST;

    }

  }

  @Override

  public String getName() {

    return "StorePointFieldSuggestion";

  }

  @Override

  public Object create(Object... parameters) {

    SuggestionProvider suggestionProvider = new StorePointFieldSuggestionProvider();

    return suggestionProvider;

  }

  private class StorePointFieldSuggestionProvider implements SuggestionProvider {

    @Override

    public String getSuggestion(String expression) {

      if (!suggestionApplies || StringUtils.isBlank(expression)) {

        return null;

      }

      long now = System.currentTimeMillis();

      if ( now - lastSuggestedTime >= RandomUtils.nextInt(5, 15) * 60 * 1000) {

        lastSuggestedTime = System.currentTimeMillis();

        I18nManager i18n = ToolsLocator.getI18nManager();

        String suggestion = i18n.getTranslation("_You_can_access_the_fields_in_a_table_by_prefixing_the_table_name_followed_by_a_period_For_example_TABLE_FIELD_This_is_necessary_whenever_the_name_of_the_field_and_the_table_match");

        return suggestion;

      }

      MutableObject<String> suggestion = new MutableObject<>();

      try {

        Code code = ExpressionUtils.compile(expression);

        if (code == null) {

          return null;

        }

        final String storename = store.getName();

        code.accept((Object obj) -> {

          if (obj instanceof Code.Identifier) {

            String varname = ((Code.Identifier) obj).name();

            if (StringUtils.equalsIgnoreCase(varname, storename)) {

              I18nManager i18n = ToolsLocator.getI18nManager();

              suggestion.setValue(

                      i18n.getTranslation("_You_can_access_the_fields_in_a_table_by_prefixing_the_table_name_followed_by_a_period_For_example_TABLE_FIELD_This_is_necessary_whenever_the_name_of_the_field_and_the_table_match")

              );

              throw new VisitCanceledException();

            }

          }

        });

      } catch (Throwable th) {

      }

      return suggestion.getValue();

    }

  }

}