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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.
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/**
 *    Copyright 2009-2016 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.apache.ibatis.builder;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;

import org.apache.ibatis.cache.Cache;
import org.apache.ibatis.cache.decorators.LruCache;
import org.apache.ibatis.cache.impl.PerpetualCache;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.keygen.KeyGenerator;
import org.apache.ibatis.mapping.CacheBuilder;
import org.apache.ibatis.mapping.Discriminator;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMap;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.mapping.ResultFlag;
import org.apache.ibatis.mapping.ResultMap;
import org.apache.ibatis.mapping.ResultMapping;
import org.apache.ibatis.mapping.ResultSetType;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.mapping.SqlSource;
import org.apache.ibatis.mapping.StatementType;
import org.apache.ibatis.reflection.MetaClass;
import org.apache.ibatis.scripting.LanguageDriver;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;

/**
 * @author Clinton Begin
 */
public class MapperBuilderAssistant extends BaseBuilder {

  private String currentNamespace;
  private String resource;
  private Cache currentCache;
  private boolean unresolvedCacheRef; // issue #676

  public MapperBuilderAssistant(Configuration configuration, String resource) {
    super(configuration);
    ErrorContext.instance().resource(resource);
    this.resource = resource;
  }

  public String getCurrentNamespace() {
    return currentNamespace;
  }

  public void setCurrentNamespace(String currentNamespace) {
    if (currentNamespace == null) {
      throw new BuilderException("The mapper element requires a namespace attribute to be specified.");
    }

    if (this.currentNamespace != null && !this.currentNamespace.equals(currentNamespace)) {
      throw new BuilderException("Wrong namespace. Expected '"
          + this.currentNamespace + "' but found '" + currentNamespace + "'.");
    }

    this.currentNamespace = currentNamespace;
  }

  public String applyCurrentNamespace(String base, boolean isReference) {
    if (base == null) {
      return null;
    }
    if (isReference) {
      // is it qualified with any namespace yet?
      if (base.contains(".")) {
        return base;
      }
    } else {
      // is it qualified with this namespace yet?
      if (base.startsWith(currentNamespace + ".")) {
        return base;
      }
      if (base.contains(".")) {
        throw new BuilderException("Dots are not allowed in element names, please remove it from " + base);
      }
    }
    return currentNamespace + "." + base;
  }

  public Cache useCacheRef(String namespace) {
    if (namespace == null) {
      throw new BuilderException("cache-ref element requires a namespace attribute.");
    }
    try {
      unresolvedCacheRef = true;
      Cache cache = configuration.getCache(namespace);
      if (cache == null) {
        throw new IncompleteElementException("No cache for namespace '" + namespace + "' could be found.");
      }
      currentCache = cache;
      unresolvedCacheRef = false;
      return cache;
    } catch (IllegalArgumentException e) {
      throw new IncompleteElementException("No cache for namespace '" + namespace + "' could be found.", e);
    }
  }

  public Cache useNewCache(Class typeClass,
      Class evictionClass,
      Long flushInterval,
      Integer size,
      boolean readWrite,
      boolean blocking,
      Properties props) {
    Cache cache = new CacheBuilder(currentNamespace)
        .implementation(valueOrDefault(typeClass, PerpetualCache.class))
        .addDecorator(valueOrDefault(evictionClass, LruCache.class))
        .clearInterval(flushInterval)
        .size(size)
        .readWrite(readWrite)
        .blocking(blocking)
        .properties(props)
        .build();
    configuration.addCache(cache);
    currentCache = cache;
    return cache;
  }

  public ParameterMap addParameterMap(String id, Class parameterClass, List parameterMappings) {
    id = applyCurrentNamespace(id, false);
    ParameterMap parameterMap = new ParameterMap.Builder(configuration, id, parameterClass, parameterMappings).build();
    configuration.addParameterMap(parameterMap);
    return parameterMap;
  }

  public ParameterMapping buildParameterMapping(
      Class parameterType,
      String property,
      Class javaType,
      JdbcType jdbcType,
      String resultMap,
      ParameterMode parameterMode,
      Class> typeHandler,
      Integer numericScale) {
    resultMap = applyCurrentNamespace(resultMap, true);

    // Class parameterType = parameterMapBuilder.type();
    Class javaTypeClass = resolveParameterJavaType(parameterType, property, javaType, jdbcType);
    TypeHandler typeHandlerInstance = resolveTypeHandler(javaTypeClass, typeHandler);

    return new ParameterMapping.Builder(configuration, property, javaTypeClass)
        .jdbcType(jdbcType)
        .resultMapId(resultMap)
        .mode(parameterMode)
        .numericScale(numericScale)
        .typeHandler(typeHandlerInstance)
        .build();
  }

  public ResultMap addResultMap(
      String id,
      Class type,
      String extend,
      Discriminator discriminator,
      List resultMappings,
      Boolean autoMapping) {
    id = applyCurrentNamespace(id, false);
    extend = applyCurrentNamespace(extend, true);

    if (extend != null) {
      if (!configuration.hasResultMap(extend)) {
        throw new IncompleteElementException("Could not find a parent resultmap with id '" + extend + "'");
      }
      ResultMap resultMap = configuration.getResultMap(extend);
      List extendedResultMappings = new ArrayList(resultMap.getResultMappings());
      extendedResultMappings.removeAll(resultMappings);
      // Remove parent constructor if this resultMap declares a constructor.
      boolean declaresConstructor = false;
      for (ResultMapping resultMapping : resultMappings) {
        if (resultMapping.getFlags().contains(ResultFlag.CONSTRUCTOR)) {
          declaresConstructor = true;
          break;
        }
      }
      if (declaresConstructor) {
        Iterator extendedResultMappingsIter = extendedResultMappings.iterator();
        while (extendedResultMappingsIter.hasNext()) {
          if (extendedResultMappingsIter.next().getFlags().contains(ResultFlag.CONSTRUCTOR)) {
            extendedResultMappingsIter.remove();
          }
        }
      }
      resultMappings.addAll(extendedResultMappings);
    }
    ResultMap resultMap = new ResultMap.Builder(configuration, id, type, resultMappings, autoMapping)
        .discriminator(discriminator)
        .build();
    configuration.addResultMap(resultMap);
    return resultMap;
  }

  public Discriminator buildDiscriminator(
      Class resultType,
      String column,
      Class javaType,
      JdbcType jdbcType,
      Class> typeHandler,
      Map discriminatorMap) {
    ResultMapping resultMapping = buildResultMapping(
        resultType,
        null,
        column,
        javaType,
        jdbcType,
        null,
        null,
        null,
        null,
        typeHandler,
        new ArrayList(),
        null,
        null,
        false);
    Map namespaceDiscriminatorMap = new HashMap();
    for (Map.Entry e : discriminatorMap.entrySet()) {
      String resultMap = e.getValue();
      resultMap = applyCurrentNamespace(resultMap, true);
      namespaceDiscriminatorMap.put(e.getKey(), resultMap);
    }
    return new Discriminator.Builder(configuration, resultMapping, namespaceDiscriminatorMap).build();
  }

  public MappedStatement addMappedStatement(
      String id,
      SqlSource sqlSource,
      StatementType statementType,
      SqlCommandType sqlCommandType,
      Integer fetchSize,
      Integer timeout,
      String parameterMap,
      Class parameterType,
      String resultMap,
      Class resultType,
      ResultSetType resultSetType,
      boolean flushCache,
      boolean useCache,
      boolean resultOrdered,
      KeyGenerator keyGenerator,
      String keyProperty,
      String keyColumn,
      String databaseId,
      LanguageDriver lang,
      String resultSets) {

    if (unresolvedCacheRef) {
      throw new IncompleteElementException("Cache-ref not yet resolved");
    }

    id = applyCurrentNamespace(id, false);
    boolean isSelect = sqlCommandType == SqlCommandType.SELECT;

    MappedStatement.Builder statementBuilder = new MappedStatement.Builder(configuration, id, sqlSource, sqlCommandType)
        .resource(resource)
        .fetchSize(fetchSize)
        .timeout(timeout)
        .statementType(statementType)
        .keyGenerator(keyGenerator)
        .keyProperty(keyProperty)
        .keyColumn(keyColumn)
        .databaseId(databaseId)
        .lang(lang)
        .resultOrdered(resultOrdered)
        .resultSets(resultSets)
        .resultMaps(getStatementResultMaps(resultMap, resultType, id))
        .resultSetType(resultSetType)
        .flushCacheRequired(valueOrDefault(flushCache, !isSelect))
        .useCache(valueOrDefault(useCache, isSelect))
        .cache(currentCache);

    ParameterMap statementParameterMap = getStatementParameterMap(parameterMap, parameterType, id);
    if (statementParameterMap != null) {
      statementBuilder.parameterMap(statementParameterMap);
    }

    MappedStatement statement = statementBuilder.build();
    configuration.addMappedStatement(statement);
    return statement;
  }

  private  T valueOrDefault(T value, T defaultValue) {
    return value == null ? defaultValue : value;
  }

  private ParameterMap getStatementParameterMap(
      String parameterMapName,
      Class parameterTypeClass,
      String statementId) {
    parameterMapName = applyCurrentNamespace(parameterMapName, true);
    ParameterMap parameterMap = null;
    if (parameterMapName != null) {
      try {
        parameterMap = configuration.getParameterMap(parameterMapName);
      } catch (IllegalArgumentException e) {
        throw new IncompleteElementException("Could not find parameter map " + parameterMapName, e);
      }
    } else if (parameterTypeClass != null) {
      List parameterMappings = new ArrayList();
      parameterMap = new ParameterMap.Builder(
          configuration,
          statementId + "-Inline",
          parameterTypeClass,
          parameterMappings).build();
    }
    return parameterMap;
  }

  private List getStatementResultMaps(
      String resultMap,
      Class resultType,
      String statementId) {
    resultMap = applyCurrentNamespace(resultMap, true);

    List resultMaps = new ArrayList();
    if (resultMap != null) {
      String[] resultMapNames = resultMap.split(",");
      for (String resultMapName : resultMapNames) {
        try {
          resultMaps.add(configuration.getResultMap(resultMapName.trim()));
        } catch (IllegalArgumentException e) {
          throw new IncompleteElementException("Could not find result map " + resultMapName, e);
        }
      }
    } else if (resultType != null) {
      ResultMap inlineResultMap = new ResultMap.Builder(
          configuration,
          statementId + "-Inline",
          resultType,
          new ArrayList(),
          null).build();
      resultMaps.add(inlineResultMap);
    }
    return resultMaps;
  }

  public ResultMapping buildResultMapping(
      Class resultType,
      String property,
      String column,
      Class javaType,
      JdbcType jdbcType,
      String nestedSelect,
      String nestedResultMap,
      String notNullColumn,
      String columnPrefix,
      Class> typeHandler,
      List flags,
      String resultSet,
      String foreignColumn,
      boolean lazy) {
    Class javaTypeClass = resolveResultJavaType(resultType, property, javaType);
    TypeHandler typeHandlerInstance = resolveTypeHandler(javaTypeClass, typeHandler);
    List composites = parseCompositeColumnName(column);
    if (composites.size() > 0) {
      column = null;
    }
    return new ResultMapping.Builder(configuration, property, column, javaTypeClass)
        .jdbcType(jdbcType)
        .nestedQueryId(applyCurrentNamespace(nestedSelect, true))
        .nestedResultMapId(applyCurrentNamespace(nestedResultMap, true))
        .resultSet(resultSet)
        .typeHandler(typeHandlerInstance)
        .flags(flags == null ? new ArrayList() : flags)
        .composites(composites)
        .notNullColumns(parseMultipleColumnNames(notNullColumn))
        .columnPrefix(columnPrefix)
        .foreignColumn(foreignColumn)
        .lazy(lazy)
        .build();
  }

  private Set parseMultipleColumnNames(String columnName) {
    Set columns = new HashSet();
    if (columnName != null) {
      if (columnName.indexOf(',') > -1) {
        StringTokenizer parser = new StringTokenizer(columnName, "{}, ", false);
        while (parser.hasMoreTokens()) {
          String column = parser.nextToken();
          columns.add(column);
        }
      } else {
        columns.add(columnName);
      }
    }
    return columns;
  }

  private List parseCompositeColumnName(String columnName) {
    List composites = new ArrayList();
    if (columnName != null && (columnName.indexOf('=') > -1 || columnName.indexOf(',') > -1)) {
      StringTokenizer parser = new StringTokenizer(columnName, "{}=, ", false);
      while (parser.hasMoreTokens()) {
        String property = parser.nextToken();
        String column = parser.nextToken();
        ResultMapping complexResultMapping = new ResultMapping.Builder(
            configuration, property, column, configuration.getTypeHandlerRegistry().getUnknownTypeHandler()).build();
        composites.add(complexResultMapping);
      }
    }
    return composites;
  }

  private Class resolveResultJavaType(Class resultType, String property, Class javaType) {
    if (javaType == null && property != null) {
      try {
        MetaClass metaResultType = MetaClass.forClass(resultType, configuration.getReflectorFactory());
        javaType = metaResultType.getSetterType(property);
      } catch (Exception e) {
        //ignore, following null check statement will deal with the situation
      }
    }
    if (javaType == null) {
      javaType = Object.class;
    }
    return javaType;
  }

  private Class resolveParameterJavaType(Class resultType, String property, Class javaType, JdbcType jdbcType) {
    if (javaType == null) {
      if (JdbcType.CURSOR.equals(jdbcType)) {
        javaType = java.sql.ResultSet.class;
      } else if (Map.class.isAssignableFrom(resultType)) {
        javaType = Object.class;
      } else {
        MetaClass metaResultType = MetaClass.forClass(resultType, configuration.getReflectorFactory());
        javaType = metaResultType.getGetterType(property);
      }
    }
    if (javaType == null) {
      javaType = Object.class;
    }
    return javaType;
  }

  /** Backward compatibility signature */
  public ResultMapping buildResultMapping(
      Class resultType,
      String property,
      String column,
      Class javaType,
      JdbcType jdbcType,
      String nestedSelect,
      String nestedResultMap,
      String notNullColumn,
      String columnPrefix,
      Class> typeHandler,
      List flags) {
      return buildResultMapping(
        resultType, property, column, javaType, jdbcType, nestedSelect,
        nestedResultMap, notNullColumn, columnPrefix, typeHandler, flags, null, null, configuration.isLazyLoadingEnabled());
  }

  public LanguageDriver getLanguageDriver(Class langClass) {
    if (langClass != null) {
      configuration.getLanguageRegistry().register(langClass);
    } else {
      langClass = configuration.getLanguageRegistry().getDefaultDriverClass();
    }
    return configuration.getLanguageRegistry().getDriver(langClass);
  }

  /** Backward compatibility signature */
  public MappedStatement addMappedStatement(
    String id,
    SqlSource sqlSource,
    StatementType statementType,
    SqlCommandType sqlCommandType,
    Integer fetchSize,
    Integer timeout,
    String parameterMap,
    Class parameterType,
    String resultMap,
    Class resultType,
    ResultSetType resultSetType,
    boolean flushCache,
    boolean useCache,
    boolean resultOrdered,
    KeyGenerator keyGenerator,
    String keyProperty,
    String keyColumn,
    String databaseId,
    LanguageDriver lang) {
    return addMappedStatement(
      id, sqlSource, statementType, sqlCommandType, fetchSize, timeout,
      parameterMap, parameterType, resultMap, resultType, resultSetType,
      flushCache, useCache, resultOrdered, keyGenerator, keyProperty,
      keyColumn, databaseId, lang, null);
  }

}