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Camel SQL support
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/**
 * 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.apache.camel.component.sql;

import java.util.Map;
import javax.sql.DataSource;

import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.impl.UriEndpointComponent;
import org.apache.camel.spi.Metadata;
import org.apache.camel.util.CamelContextHelper;
import org.apache.camel.util.IntrospectionSupport;
import org.springframework.jdbc.core.JdbcTemplate;

/**
 * The SQL Component is for working with databases using JDBC queries.
 *
 * @version 
 */
public class SqlComponent extends UriEndpointComponent {
    private DataSource dataSource;
    @Metadata(defaultValue = "true")
    private boolean usePlaceholder = true;

    public SqlComponent() {
        super(SqlEndpoint.class);
    }

    public SqlComponent(Class endpointClass) {
        super(endpointClass);
    }

    public SqlComponent(CamelContext context) {
        super(context, SqlEndpoint.class);
    }

    public SqlComponent(CamelContext context, Class endpointClass) {
        super(context, endpointClass);
    }

    @Override
    protected Endpoint createEndpoint(String uri, String remaining, Map parameters) throws Exception {
        DataSource target = null;

        // endpoint options overrule component configured datasource
        DataSource ds = resolveAndRemoveReferenceParameter(parameters, "dataSource", DataSource.class);
        if (ds != null) {
            target = ds;
        }
        String dataSourceRef = getAndRemoveParameter(parameters, "dataSourceRef", String.class);
        if (target == null && dataSourceRef != null) {
            target = CamelContextHelper.mandatoryLookup(getCamelContext(), dataSourceRef, DataSource.class);
        }
        if (target == null) {
            // fallback and use component
            target = dataSource;
        }
        if (target == null) {
            throw new IllegalArgumentException("DataSource must be configured");
        }

        String parameterPlaceholderSubstitute = getAndRemoveParameter(parameters, "placeholder", String.class, "#");

        JdbcTemplate jdbcTemplate = new JdbcTemplate(target);
        Map templateOptions = IntrospectionSupport.extractProperties(parameters, "template.");
        IntrospectionSupport.setProperties(jdbcTemplate, templateOptions);

        String query = remaining;
        if (usePlaceholder) {
            query = query.replaceAll(parameterPlaceholderSubstitute, "?");
        }

        String onConsume = getAndRemoveParameter(parameters, "consumer.onConsume", String.class);
        if (onConsume == null) {
            onConsume = getAndRemoveParameter(parameters, "onConsume", String.class);
        }
        if (onConsume != null && usePlaceholder) {
            onConsume = onConsume.replaceAll(parameterPlaceholderSubstitute, "?");
        }
        String onConsumeFailed = getAndRemoveParameter(parameters, "consumer.onConsumeFailed", String.class);
        if (onConsumeFailed == null) {
            onConsumeFailed = getAndRemoveParameter(parameters, "onConsumeFailed", String.class);
        }
        if (onConsumeFailed != null && usePlaceholder) {
            onConsumeFailed = onConsumeFailed.replaceAll(parameterPlaceholderSubstitute, "?");
        }
        String onConsumeBatchComplete = getAndRemoveParameter(parameters, "consumer.onConsumeBatchComplete", String.class);
        if (onConsumeBatchComplete == null) {
            onConsumeBatchComplete = getAndRemoveParameter(parameters, "onConsumeBatchComplete", String.class);
        }
        if (onConsumeBatchComplete != null && usePlaceholder) {
            onConsumeBatchComplete = onConsumeBatchComplete.replaceAll(parameterPlaceholderSubstitute, "?");
        }

        SqlEndpoint endpoint = new SqlEndpoint(uri, this, jdbcTemplate, query);
        endpoint.setPlaceholder(parameterPlaceholderSubstitute);
        endpoint.setUsePlaceholder(isUsePlaceholder());
        endpoint.setOnConsume(onConsume);
        endpoint.setOnConsumeFailed(onConsumeFailed);
        endpoint.setOnConsumeBatchComplete(onConsumeBatchComplete);
        endpoint.setDataSource(ds);
        endpoint.setDataSourceRef(dataSourceRef);
        endpoint.setTemplateOptions(templateOptions);
        return endpoint;
    }

    /**
     * Sets the DataSource to use to communicate with the database.
     */
    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public DataSource getDataSource() {
        return dataSource;
    }

    /**
     * Sets whether to use placeholder and replace all placeholder characters with ? sign in the SQL queries.
     * 
     * This option is default true
     */
    public void setUsePlaceholder(boolean usePlaceholder) {
        this.usePlaceholder = usePlaceholder;
    }

    public boolean isUsePlaceholder() {
        return usePlaceholder;
    }
}