Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2020 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.expressionevaluator.impl.symboltable;

import org.apache.commons.lang3.Range;

import org.apache.commons.lang3.StringUtils;

import org.gvsig.expressionevaluator.ExpressionEvaluatorLocator;

import org.gvsig.expressionevaluator.ExpressionEvaluatorManager;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.MutableSymbolTable;

import org.gvsig.expressionevaluator.impl.DALFunctions;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

import org.gvsig.expressionevaluator.spi.AbstractSymbolTable;

import org.gvsig.fmap.dal.DataManager;

import org.gvsig.fmap.dal.expressionevaluator.FeatureSymbolTable;

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.DynObject;

import org.gvsig.tools.dynobject.DynObjectAdapter;

import org.gvsig.tools.dynobject.exception.DynFieldNotFoundException;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public class FeatureSymbolTableImpl extends AbstractSymbolTable implements FeatureSymbolTable {

  private final Function current_row;

  private Feature feature;

  private FeatureType type;

  private String storeName;

  private DynObject storeAdapter;

  @SuppressWarnings("OverridableMethodCallInConstructor")

  public FeatureSymbolTableImpl() {

    super(DataManager.DAL_SYMBOL_TABLE_FEATURE);

    this.current_row = new AbstractFunction(

            DALFunctions.GROUP_DATA_ACCESS,

            DALFunctions.FUNCTION_CURRENT_ROW,

            Range.is(0),

            "Return the current row when used in a table filter.\n"

            + "Return null if used outer a table filter.",

            DALFunctions.FUNCTION_CURRENT_ROW + "()",

            null,

            "Feature"

    ) {

      @Override

      public Object call(Interpreter interpreter, Object[] args) throws Exception {

        return feature;

      }

    };

    this.storeAdapter = new DynObjectAdapter() {

        @Override

        public Object getDynValue(String name) throws DynFieldNotFoundException {

          try {

            return feature.get(name);

          } catch (Exception ex) {

            return feature.getExtraValue(name);

          }

        }

        @Override

        public boolean hasDynValue(String name) {

          if( feature.getType().get(name)!=null ) {

            return true;

          }

          return feature.hasExtraValue(name);

        }

      };

  }

  @Override

  public FeatureSymbolTableImpl clone() throws CloneNotSupportedException {

    FeatureSymbolTableImpl other = (FeatureSymbolTableImpl) super.clone();

    return other;

  }

  @Override

  public Function function(String name) {

    if (StringUtils.equalsIgnoreCase(name, DALFunctions.FUNCTION_CURRENT_ROW)) {

      return this.current_row;

    }

    return super.function(name);

  }

  @Override

  public boolean exists(String name) {

    if (type == null) {

      return false;

    }

    if ( type.get(name) != null) {

      return true;

    }

    if (StringUtils.equalsIgnoreCase(name, this.storeName)) {

      return true;

    }

    if( feature==null ) {

      return false;

    }

    if (this.feature.hasExtraValue(name)) {

      return true;

    }

    return false;

  }

  @Override

  public Object value(String name) {

    if (feature == null) {

      return null;

    }

    if (StringUtils.equalsIgnoreCase(name, this.storeName)) {

      return this.storeAdapter;

    }

    try {

      return this.feature.get(name);

    } catch (Exception ex) {

      return this.feature.getExtraValue(name);

    }

  }

  @Override

  public boolean isSQLCompatible(String name) {

    if (this.type == null) {

      return super.isSQLCompatible(name);

    }

    FeatureAttributeDescriptor attrdesc = this.type.getAttributeDescriptor(name);

    if (attrdesc == null) {

      return true;

    }

    if (attrdesc.isComputed()) {

      return false;

    }

    return true;

  }

  @Override

  public void setFeature(Feature feature) {

    this.feature = feature;

    if (this.type == null) {

      this.type = feature.getType();

      FeatureStore store = feature.getStore();

      if (store != null) {

        this.storeName = store.getName();

      }

    }

  }

  @Override

  public MutableSymbolTable createParent() {

    ExpressionEvaluatorManager expManager = ExpressionEvaluatorLocator.getManager();

    MutableSymbolTable symbolTable = expManager.createSymbolTable();

    symbolTable.addSymbolTable(this);

    return symbolTable;

  }

}