/*
 * Copyright 2012, 2013 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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 2, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.web.common;

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

import com.redhat.thermostat.storage.core.Key;
import com.redhat.thermostat.storage.core.Update;
import com.redhat.thermostat.storage.model.Pojo;
import com.redhat.thermostat.storage.query.Expression;

public class WebUpdate<T extends Pojo> implements Update<T> {

    public static class UpdateValue {
        private Key<?> key;
        private transient Object value;
        private String valueClass;

        public UpdateValue() {
            this(null, null);
        }

        public UpdateValue(Key<?> key, Object value) {
            this.key = key;
            this.value = value;
            if (value != null) {
                valueClass = value.getClass().getName();
            }
        }

        public Key<?> getKey() {
            return key;
        }

        public void setKey(Key<?> key) {
            this.key = key;
        }

        public Object getValue() {
            return value;
        }

        public void setValue(Object value) {
            this.value = value;
        }

        public String getValueClass() {
            return valueClass;
        }

        public void setValueClass(String valueClass) {
            this.valueClass = valueClass;
        }

    }

    private int categoryId;
    private Expression whereExpression;
    private List<UpdateValue> updateValues;

    public WebUpdate() {
        updateValues = new ArrayList<>();
    }

    public void where(Expression expr) {
        whereExpression = expr;
    }

    public <S> void set(Key<S> key, S value) {
        updateValues.add(new UpdateValue(key, value));
    }

    public int getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(int categoryId) {
        this.categoryId = categoryId;
    }

    public Expression getWhereExpression() {
        return whereExpression;
    }
    
    public List<WebUpdate.UpdateValue> getUpdates() {
        return updateValues;
    }

    @Override
    public int apply() {
        // This should never be called. Overridden by the actual
        // implementation.
        throw new IllegalStateException();
    }

}