/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 *******************************************************************************/
package org.ofbiz.entity.condition;

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

import javolution.context.ObjectFactory;
import javolution.lang.Reusable;

import org.ofbiz.entity.Delegator;
import org.ofbiz.entity.GenericEntity;
import org.ofbiz.entity.GenericModelException;
import org.ofbiz.entity.config.model.Datasource;
import org.ofbiz.entity.model.ModelEntity;
import org.ofbiz.entity.model.ModelField;

/**
 * Base class for condition expression values.
 *
 */
@SuppressWarnings("serial")
public abstract class EntityConditionValue extends EntityConditionBase {

    public static EntityConditionValue CONSTANT_NUMBER(Number value) { return ConstantNumberValue.createConstantNumberValue(value); }
    public static class ConstantNumberValue extends EntityConditionValue implements Reusable {
        protected static ConstantNumberValue createConstantNumberValue(Number value) {
            ConstantNumberValue cnv = factory.object();
            cnv.init(value);
            return cnv;
        }
        protected static final ObjectFactory<ConstantNumberValue> factory = new ObjectFactory<ConstantNumberValue>() {
            protected ConstantNumberValue create() {
                return new ConstantNumberValue();
            }
        };

        private Number value;

        protected void init(Number value) {
            this.value = value;
        }

        @Override
        public void accept(EntityConditionVisitor visitor) {
            visitor.acceptEntityConditionValue(this);
        }

        @Override
        public void addSqlValue(StringBuilder sql, Map<String, String> tableAliases, ModelEntity modelEntity, List<EntityConditionParam> entityConditionParams, boolean includeTableNamePrefix, Datasource datasourceinfo) {
            sql.append(value);
        }

        @Override
        public EntityConditionValue freeze() {
            return this;
        }

        @Override
        public ModelField getModelField(ModelEntity modelEntity) {
            return null;
        }

        @Override
        public void setModelField(ModelField field) {
            // Do nothing;
        }

        @Override
        public Object getValue(Delegator delegator, Map<String, ? extends Object> map) {
            return value;
        }

        @Override
        public void reset() {
            this.value = value;
        }

        @Override
        public void validateSql(org.ofbiz.entity.model.ModelEntity modelEntity) {
        }

        @Override
        public void visit(EntityConditionVisitor visitor) {
            visitor.acceptObject(value);
        }
    }

    public abstract ModelField getModelField(ModelEntity modelEntity);

    public abstract void setModelField(ModelField modelEntity);

    public void addSqlValue(StringBuilder sql, ModelEntity modelEntity, List<EntityConditionParam> entityConditionParams, boolean includeTableNamePrefix,
            Datasource datasourceinfo) {
        addSqlValue(sql, emptyAliases, modelEntity, entityConditionParams, includeTableNamePrefix, datasourceinfo);
    }

    public abstract void addSqlValue(StringBuilder sql, Map<String, String> tableAliases, ModelEntity modelEntity, List<EntityConditionParam> entityConditionParams,
            boolean includeTableNamePrefix, Datasource datasourceinfo);

    public abstract void validateSql(ModelEntity modelEntity) throws GenericModelException;

    public Object getValue(GenericEntity entity) {
        if (entity == null) {
            return null;
        }
        return getValue(entity.getDelegator(), entity);
    }

    public abstract Object getValue(Delegator delegator, Map<String, ? extends Object> map);

    public abstract EntityConditionValue freeze();

    public abstract void visit(EntityConditionVisitor visitor);

    public void accept(EntityConditionVisitor visitor) {
        throw new IllegalArgumentException("accept not implemented");
    }

    public void toString(StringBuilder sb) {
        addSqlValue(sb, null, new ArrayList<EntityConditionParam>(), false, null);
    }

    @Override
    public String toString() {
        StringBuilder sql = new StringBuilder();
        toString(sql);
        return sql.toString();
    }
}