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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.search.compare;

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

import org.efaps.db.AbstractObjectQuery;
import org.efaps.db.search.AbstractQPart;
import org.efaps.db.search.QAttribute;
import org.efaps.db.search.value.AbstractQValue;
import org.efaps.db.wrapper.SQLPart;
import org.efaps.db.wrapper.SQLSelect;
import org.efaps.util.EFapsException;


/**
 * TODO comment!
 *
 * @author The eFaps Team
 * @version $Id: QEqual.java 7483 2012-05-11 16:57:38Z [email protected] $
 */
public class QEqual
    extends AbstractQAttrCompare
{

   /**
    * The values the given attribute must be equal to.
    */
    private final List values = new ArrayList();

    /**
     * Constructor setting attribute and value.
     * @param _attribute Attribute to be checked for equal
     * @param _values    values as criteria
     */
    public QEqual(final QAttribute _attribute,
                  final AbstractQValue... _values)
    {
        super(_attribute, null);
        for (final AbstractQValue value : _values) {
            this.values.add(value);
        }
    }

    /**
     * Get the first value from the value list.
     *
     * @return null if list is empty else first value
     */
    @Override
    public AbstractQValue getValue()
    {
        return this.values.isEmpty() ? null : this.values.get(0);
    }

    /**
     * Getter method for the instance variable {@link #values}.
     *
     * @return value of instance variable {@link #values}
     */
    public List getValues()
    {
        return this.values;
    }

    /**
     * Add a value to be included in the equal.
     * @param _value value to be include
     * @return this
     */
    public AbstractQPart addValue(final AbstractQValue _value)
    {
        this.values.add(_value);
        return this;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public QEqual appendSQL(final SQLSelect _sql)
        throws EFapsException
    {
        getAttribute().appendSQL(_sql);
        if (this.values.size() > 1) {
            _sql.addPart(SQLPart.IN).addPart(SQLPart.PARENTHESIS_OPEN);
            boolean first = true;
            for (final AbstractQValue value : this.values) {
                if (first) {
                    first = false;
                } else {
                    _sql.addPart(SQLPart.COMMA);
                }
                value.appendSQL(_sql);
            }
            _sql.addPart(SQLPart.PARENTHESIS_CLOSE);
        } else {
            _sql.addPart(SQLPart.EQUAL);
            getValue().appendSQL(_sql);
        }
        return this;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public QEqual prepare(final AbstractObjectQuery _query,
                                 final AbstractQPart _part)
        throws EFapsException
    {
        getAttribute().prepare(_query, this);
        for (final AbstractQValue value : this.values) {
            value.prepare(_query, this);
        }
        return this;
    }
}