com.mybatis.jpa.statement.DefinitionStatementBuilder Maven / Gradle / Ivy

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The plugins for mybatis, in order to provider the ability to handler jpa.
There is a newer version: 2.5.1
package com.mybatis.jpa.statement;

import com.mybatis.jpa.definition.AnnotationDefinitionRegistry;
import com.mybatis.jpa.definition.adaptor.AnnotationAdaptable;
import com.mybatis.jpa.definition.property.AnnotationProperty;
import com.mybatis.jpa.definition.template.SqlTemplate;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.mapping.StatementType;
import org.apache.ibatis.scripting.LanguageDriver;
import org.apache.ibatis.session.Configuration;
import sun.reflect.generics.reflectiveObjects.TypeVariableImpl;

/**
 * @author svili
 **/
public class DefinitionStatementBuilder implements StatementBuildable {

  protected Configuration configuration;

  protected AnnotationDefinitionRegistry definitionRegistry;

  public DefinitionStatementBuilder(Configuration configuration) {
    this(configuration, new AnnotationDefinitionRegistry());
  }

  public DefinitionStatementBuilder(Configuration configuration,
      AnnotationDefinitionRegistry definitionRegistry) {
    this.configuration = configuration;
    this.definitionRegistry = definitionRegistry;
  }

  @Override
  public void parseStatement(Method method, Class targetClass) {
    String resourceName = targetClass.toString();

    if (!configuration.isResourceLoaded(resourceName)) {
      configuration.addLoadedResource(resourceName);
    }
    String targetClassName = targetClass.getName();

    LanguageDriver languageDriver = configuration.getDefaultScriptingLanuageInstance();
    SqlSource sqlSource = languageDriver
        .createSqlSource(configuration, parseSQL(method, targetClass), Object.class);
    String statementId = targetClassName + "." + method.getName();
    MappedStatement.Builder builder = new MappedStatement.Builder(configuration, statementId,
        sqlSource, recognizeSqlCommandType(method));

    String resource = recognizeResource(targetClassName);
    builder.resource(resource).lang(languageDriver).statementType(StatementType.PREPARED);
    MappedStatement statement = builder.build();
    configuration.addMappedStatement(statement);
  }

  protected String parseSQL(Method method, Class targetClass) {
    Annotation annotation = recognizeDefinitionAnnotation(method);
    AnnotationAdaptable adaptor = recognizeAdaptor(method);

    AnnotationProperty annotationProperty = adaptor.context(annotation);
    SqlTemplate sqlTemplate = adaptor.sqlTemplate(annotation);

    Class type = recognizeEntityType(method, targetClass);

    String sql = sqlTemplate.parseSQL(type);

    if (SqlCommandType.UPDATE.equals(adaptor.sqlCommandType()) || SqlCommandType.DELETE
        .equals(adaptor.sqlCommandType())) {
      if (!"".equals(annotationProperty.where())) {
        sql = sql + " where " + annotationProperty.where();
      }
    }

    return "";
  }

  protected String recognizeResource(String targetClassName) {
    return targetClassName.replace(".", "/") + ".java (best guess)";
  }

  protected SqlCommandType recognizeSqlCommandType(Method method) {
    return recognizeAdaptor(method).sqlCommandType();
  }

  protected AnnotationAdaptable recognizeAdaptor(Method method) {
    Annotation annotation = recognizeDefinitionAnnotation(method);
    return definitionRegistry.resolveAdaptor(annotation.annotationType());
  }

  protected Annotation recognizeDefinitionAnnotation(Method method) {
    for (Class annotationType : definitionRegistry.getAnnotationAdaptors()
        .keySet()) {
      if (method.isAnnotationPresent(annotationType)) {
        return method.getAnnotation(annotationType);
      }
    }
    return null;
  }

  protected Class recognizeEntityType(Method method, Class targetClass) {
    Type[] genericTypes = method.getGenericParameterTypes();
    Type genericType = genericTypes[0];
    if (genericType instanceof TypeVariableImpl) {
      // interface XXXMapper extends IBaseMapper
      Type[] interfaces = targetClass.getGenericInterfaces();
      for (Type type : interfaces) {
        if (type instanceof ParameterizedType) {
          ParameterizedType pt = (ParameterizedType) type;
          return (Class) pt.getActualTypeArguments()[0];
        }
      }
    }
    Class actualType;
    if (genericType instanceof ParameterizedType) {
      ParameterizedType pt = (ParameterizedType) genericType;
      actualType = (Class) pt.getActualTypeArguments()[0];
    } else {
      actualType = (Class) genericType;
    }
    return actualType;
  }

}