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 java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.List;

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

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 static org.gvsig.fmap.dal.DataManager.FUNCTION_CURRENT_ROW;

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

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

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;

/**

 *

 * @author jjdelcerro

 */

@SuppressWarnings("UseSpecificCatch")

public class FeatureSymbolTableImpl extends AbstractSymbolTable implements FeatureSymbolTable {

  private static final String DAL_SYMBOL_TABLE_FEATURE = "DALSymbolTableFeature";

  private final Function current_row;

  private Feature feature;

  private FeatureType type;

  private String storeName;

  private final TableAttributeHandler storeAttributeHandler;

  @SuppressWarnings("OverridableMethodCallInConstructor")

  public FeatureSymbolTableImpl() {

    this(DAL_SYMBOL_TABLE_FEATURE);

  }

  public FeatureSymbolTableImpl(String name) {

    super(name);

    this.current_row = new AbstractFunction(

            DALFunctions.GROUP_DATA_ACCESS,

            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.",

            FUNCTION_CURRENT_ROW + "()",

            null,

            "Feature"

    ) {

      @Override

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

        return feature;

      }

    };

    this.storeAttributeHandler = new TableAttributeHandler() {

      @Override

      public Object get(String name) {

        if( feature==null ) {

            return null;

        }

        try {

          return feature.get(name);

        } catch (Exception ex) {

          return feature.getExtraValue(name);

        }

      }

      @Override

      public String getName() {

        return storeName;

      }

    };

  }

    @Override

    public Collection<String> localvariables() {

        List<String> v = new ArrayList<>();

        v.add(SYMBOL_CURRENT_TABLE);

        v.add(SYMBOL_CURRENT_ROW);

        try {

            if( feature != null ) {

                for (FeatureAttributeDescriptor attr : feature.getType()) {

                    v.add(attr.getName());

                }

            }

        } catch(Throwable t) {

        }

        v.addAll(super.localvariables());

        return Collections.unmodifiableCollection(v);        

    }

  @Override

  public FeatureSymbolTableImpl clone() throws CloneNotSupportedException {

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

    return other;

  }

  @Override

  public Function function(String name) {

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

      return this.current_row;

    }

    return super.function(name);

  }

  @Override

  public boolean exists(String name) {

    if (feature != null) {

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

            return true;

        }

    }

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

        StringUtils.equalsIgnoreCase(name, SYMBOL_CURRENT_TABLE) ||

        StringUtils.equalsIgnoreCase(name, SYMBOL_CURRENT_ROW) ) {

      return true;

    }

    return super.exists(name);

  }

  @Override

  public Object value(String name) {

      if (feature != null) {          

        try {

            return this.feature.get(name);

        } catch (Exception ex) {

            //DO NOTHING

        }

        if (StringUtils.equalsIgnoreCase(name, SYMBOL_CURRENT_ROW)) {

            return this.feature;

        }

      }

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

              || StringUtils.equalsIgnoreCase(name, SYMBOL_CURRENT_TABLE)) {

          return this.storeAttributeHandler;

      }

      return super.value(name);

  }

  public void setVar(String name, Object value) {

      if (feature instanceof EditableFeature ) {

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

              ((EditableFeature)this.feature).set(name, value);

              return;

          }

      }

      super.setVar(name, value);

  }

  @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.feature!=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;

  }

    @Override

    public Feature getFeature() {

        return this.feature;

    }

}