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Velocity support for MyBatis
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/**
 *    Copyright 2012-2018 the original author or authors.
 *
 *    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.
 */
package org.mybatis.scripting.velocity;

import java.util.HashMap;
import java.util.Map;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.session.Configuration;

public class SQLScriptSource implements SqlSource {

  protected static final String PARAMETER_OBJECT_KEY = "_parameter";
  protected static final String DATABASE_ID_KEY = "_databaseId";
  protected static final String MAPPING_COLLECTOR_KEY = "_pmc";
  protected static final String VARIABLES_KEY = "_vars";

  private static int templateIndex = 0;

  private final ParameterMapping[] parameterMappingSources;
  private final Object compiledScript;
  private final Configuration configuration;

  public SQLScriptSource(Configuration newConfiguration, String script, Class parameterTypeClass) {
    this.configuration = newConfiguration;
    ParameterMappingSourceParser mappingParser = new ParameterMappingSourceParser(newConfiguration, script,
        parameterTypeClass);
    this.parameterMappingSources = mappingParser.getParameterMappingSources();
    this.compiledScript = VelocityFacade.compile(mappingParser.getSql(), "velocity-template-" + (++templateIndex));
  }

  @Override
  public BoundSql getBoundSql(Object parameterObject) {

    final Map context = new HashMap<>();
    final ParameterMappingCollector pmc = new ParameterMappingCollector(this.parameterMappingSources, context,
        this.configuration);

    context.put(DATABASE_ID_KEY, this.configuration.getDatabaseId());
    context.put(PARAMETER_OBJECT_KEY, parameterObject);
    context.put(MAPPING_COLLECTOR_KEY, pmc);
    context.put(VARIABLES_KEY, this.configuration.getVariables());

    final String sql = VelocityFacade.apply(this.compiledScript, context);
    BoundSql boundSql = new BoundSql(this.configuration, sql, pmc.getParameterMappings(), parameterObject);
    for (Map.Entry entry : context.entrySet()) {
      boundSql.setAdditionalParameter(entry.getKey(), entry.getValue());
    }

    return boundSql;

  }

}