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eFaps is a framework used to map objects with or without attached files to a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface. The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.

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/*
 * Copyright 2003 - 2012 The eFaps Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Revision:        $Rev: 7483 $
 * Last Changed:    $Date: 2012-05-11 11:57:38 -0500 (Fri, 11 May 2012) $
 * Last Changed By: $Author: [email protected] $
 */

package org.efaps.db.print.value;

import java.util.ArrayList;
import java.util.List;

import org.efaps.admin.datamodel.Attribute;
import org.efaps.admin.datamodel.Type;
import org.efaps.db.print.ISelectPart;
import org.efaps.db.print.OneSelect;
import org.efaps.db.wrapper.SQLSelect;
import org.efaps.util.EFapsException;

/**
 * Abstract class used as base for all different types of ValueSelect.
 * A ValueSelct represents the part of a SQL-Statament that actual selects
 * a value.
 *
 * @author The eFaps Team
 * @version $Id: AbstractValueSelect.java 7483 2012-05-11 16:57:38Z [email protected] $
 */
public abstract class AbstractValueSelect
{

    /**
     * List of column indexes the values have in the ResultSet returned from the
     * eFaps database.
     */
    private final List colIndexs = new ArrayList();

    /**
     * Parent of this AbstractValueSelect.
     */
    private AbstractValueSelect parent;

    /**
     * Child of this AbstractValueSelect.
     */
    private AbstractValueSelect child;

    /**
     *  OneSelect this ValueSelect belongs to.
     */
    private final OneSelect oneSelect;

    /**
     * SelectPart this ValueSelect is connected to.
     */
    private ISelectPart parentSelectPart;

    /**
     * Constructor setting the OneSelect this valueselect belongs to.
     *
     * @param _oneSelect OneSelect
     */
    public AbstractValueSelect(final OneSelect _oneSelect)
    {
        this.oneSelect = _oneSelect;
        if (!this.oneSelect.getSelectParts().isEmpty()) {
            this.parentSelectPart = this.oneSelect.getSelectParts().get(this.oneSelect.getSelectParts().size() - 1);
        }
    }

    /**
     * Getter method for instance variable {@link #parent}.
     *
     * @return value of instance variable {@link #parent}
     */
    public AbstractValueSelect getParent()
    {
        return this.parent;
    }

    /**
     * Getter method for the instance variable {@link #parentSelectPart}.
     *
     * @return value of instance variable {@link #parentSelectPart}
     */
    public ISelectPart getParentSelectPart()
    {
        return this.parentSelectPart;
    }

    /**
     * Method must return a unique String to identify the class. This is used to
     * determine which class was instantiated instead of using "instanceof".
     *
     * @return unique name.
     */
    public abstract String getValueType();

    /**
     * Getter method for instance variable {@link #colIndexs}.
     *
     * @return instance variable {@link #colIndexs}
     */
    public List getColIndexs()
    {
        return this.colIndexs;
    }

    /**
     * Method to set an AbstractValueSelect as the parent of this
     * AbstractValueSelect.
     *
     * @param _parent AbstractValueSelect to be set as parent
     */
    public void setParentValueSelect(final AbstractValueSelect _parent)
    {
        this.parent = _parent;
    }

    /**
     * Method adds an AbstractValueSelect as a child of this chain of
     * AbstractValueSelect.
     *
     * @param _valueSelect AbstractValueSelect to be added as child
     * @throws EFapsException on error
     */
    public void addChildValueSelect(final AbstractValueSelect _valueSelect)
        throws EFapsException
    {
        if (this.child == null) {
            this.child = _valueSelect;
            _valueSelect.setParentValueSelect(this);
        } else {
            this.child.addChildValueSelect(_valueSelect);
        }
    }

    /**
     * Method is used to add the select part for this ValueSelect to the select
     * statement. e.g. "select T0.ID, TO.TYPEID" etc.
     *
     * @param _type Type this ValueSelect belongs to
     * @param _select SQL select statement to be appended to
     * @param _tableIndex index of the table
     * @param _colIndex last index of the column
     * @return number of columns added to the select statement
     */
    public int append2SQLSelect(final Type _type,
                                final SQLSelect _select,
                                final int _tableIndex,
                                final int _colIndex)
    {
        return 0;
    }

    /**
     * Method to get the value for the current object.
     *
     * @param _object current object
     * @throws EFapsException on error
     * @return object
     */
    public Object getValue(final Object _object)
        throws EFapsException
    {
        return _object;
    }

    /**
     * Method to get the value for a list of object.
     *
     * @param _objectList list of objects
     * @throws EFapsException on error
     * @return object
     */
    public Object getValue(final List