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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 2009-2017 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.session;

import org.apache.ibatis.binding.MapperRegistry;
import org.apache.ibatis.builder.CacheRefResolver;
import org.apache.ibatis.builder.ResultMapResolver;
import org.apache.ibatis.builder.annotation.MethodResolver;
import org.apache.ibatis.builder.xml.XMLStatementBuilder;
import org.apache.ibatis.cache.Cache;
import org.apache.ibatis.cache.decorators.FifoCache;
import org.apache.ibatis.cache.decorators.LruCache;
import org.apache.ibatis.cache.decorators.SoftCache;
import org.apache.ibatis.cache.decorators.WeakCache;
import org.apache.ibatis.cache.impl.PerpetualCache;
import org.apache.ibatis.datasource.jndi.JndiDataSourceFactory;
import org.apache.ibatis.datasource.pooled.PooledDataSourceFactory;
import org.apache.ibatis.datasource.unpooled.UnpooledDataSourceFactory;
import org.apache.ibatis.executor.*;
import org.apache.ibatis.executor.keygen.KeyGenerator;
import org.apache.ibatis.executor.loader.ProxyFactory;
import org.apache.ibatis.executor.loader.cglib.CglibProxyFactory;
import org.apache.ibatis.executor.loader.javassist.JavassistProxyFactory;
import org.apache.ibatis.executor.parameter.ParameterHandler;
import org.apache.ibatis.executor.resultset.DefaultResultSetHandler;
import org.apache.ibatis.executor.resultset.ResultSetHandler;
import org.apache.ibatis.executor.statement.RoutingStatementHandler;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.io.VFS;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl;
import org.apache.ibatis.logging.jdk14.Jdk14LoggingImpl;
import org.apache.ibatis.logging.log4j.Log4jImpl;
import org.apache.ibatis.logging.log4j2.Log4j2Impl;
import org.apache.ibatis.logging.nologging.NoLoggingImpl;
import org.apache.ibatis.logging.slf4j.Slf4jImpl;
import org.apache.ibatis.logging.stdout.StdOutImpl;
import org.apache.ibatis.mapping.*;
import org.apache.ibatis.parsing.XNode;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.InterceptorChain;
import org.apache.ibatis.reflection.DefaultReflectorFactory;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.ReflectorFactory;
import org.apache.ibatis.reflection.factory.DefaultObjectFactory;
import org.apache.ibatis.reflection.factory.ObjectFactory;
import org.apache.ibatis.reflection.wrapper.DefaultObjectWrapperFactory;
import org.apache.ibatis.reflection.wrapper.ObjectWrapperFactory;
import org.apache.ibatis.scripting.LanguageDriver;
import org.apache.ibatis.scripting.LanguageDriverRegistry;
import org.apache.ibatis.scripting.defaults.RawLanguageDriver;
import org.apache.ibatis.scripting.xmltags.XMLLanguageDriver;
import org.apache.ibatis.transaction.Transaction;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;
import org.apache.ibatis.transaction.managed.ManagedTransactionFactory;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeAliasRegistry;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;

import java.util.*;

/**
 * @author Clinton Begin
 */
public class Configuration {

    protected Environment environment;

    protected boolean safeRowBoundsEnabled;
    protected boolean safeResultHandlerEnabled = true;
    protected boolean mapUnderscoreToCamelCase;
    protected boolean aggressiveLazyLoading;
    protected boolean multipleResultSetsEnabled = true;
    protected boolean useGeneratedKeys;
    protected boolean useColumnLabel = true;
    protected boolean cacheEnabled = true;
    protected boolean callSettersOnNulls;
    protected boolean useActualParamName = true;
    protected boolean returnInstanceForEmptyRow;

    protected String logPrefix;
    protected Class logImpl;
    protected Class vfsImpl;
    protected LocalCacheScope localCacheScope = LocalCacheScope.SESSION;
    protected JdbcType jdbcTypeForNull = JdbcType.OTHER;
    protected Set lazyLoadTriggerMethods = new HashSet(Arrays.asList(new String[]{"equals", "clone", "hashCode", "toString"}));
    protected Integer defaultStatementTimeout;
    protected Integer defaultFetchSize;
    protected ExecutorType defaultExecutorType = ExecutorType.SIMPLE;
    protected AutoMappingBehavior autoMappingBehavior = AutoMappingBehavior.PARTIAL;
    protected AutoMappingUnknownColumnBehavior autoMappingUnknownColumnBehavior = AutoMappingUnknownColumnBehavior.NONE;

    protected Properties variables = new Properties();
    protected ReflectorFactory reflectorFactory = new DefaultReflectorFactory();
    protected ObjectFactory objectFactory = new DefaultObjectFactory();
    protected ObjectWrapperFactory objectWrapperFactory = new DefaultObjectWrapperFactory();

    protected boolean lazyLoadingEnabled = false;
    protected ProxyFactory proxyFactory = new JavassistProxyFactory(); // #224 Using internal Javassist instead of OGNL

    protected String databaseId;
    /**
     * Configuration factory class.
     * Used to create Configuration for loading deserialized unread properties.
     *
     * @see Issue 300 (google code)
     */
    protected Class configurationFactory;

    protected final MapperRegistry mapperRegistry = new MapperRegistry(this);
    protected final InterceptorChain interceptorChain = new InterceptorChain();
    protected final TypeHandlerRegistry typeHandlerRegistry = new TypeHandlerRegistry();
    protected final TypeAliasRegistry typeAliasRegistry = new TypeAliasRegistry();
    protected final LanguageDriverRegistry languageRegistry = new LanguageDriverRegistry();

    protected final Map mappedStatements = new StrictMap("Mapped Statements collection");
    protected final Map caches = new StrictMap("Caches collection");
    protected final Map resultMaps = new StrictMap("Result Maps collection");
    protected final Map parameterMaps = new StrictMap("Parameter Maps collection");
    protected final Map keyGenerators = new StrictMap("Key Generators collection");

    protected final Set loadedResources = new HashSet();
    protected final Set loadedJpaMappers = new HashSet();
    protected final Map sqlFragments = new StrictMap("XML fragments parsed from previous mappers");

    protected final Collection incompleteStatements = new LinkedList();
    protected final Collection incompleteCacheRefs = new LinkedList();
    protected final Collection incompleteResultMaps = new LinkedList();
    protected final Collection incompleteMethods = new LinkedList();

    /*
     * A map holds cache-ref relationship. The key is the namespace that
     * references a cache bound to another namespace and the value is the
     * namespace which the actual cache is bound to.
     */
    protected final Map cacheRefMap = new HashMap();

    public Configuration(Environment environment) {
        this();
        this.environment = environment;
    }

    public Configuration() {
        typeAliasRegistry.registerAlias("JDBC", JdbcTransactionFactory.class);
        typeAliasRegistry.registerAlias("MANAGED", ManagedTransactionFactory.class);

        typeAliasRegistry.registerAlias("JNDI", JndiDataSourceFactory.class);
        typeAliasRegistry.registerAlias("POOLED", PooledDataSourceFactory.class);
        typeAliasRegistry.registerAlias("UNPOOLED", UnpooledDataSourceFactory.class);

        typeAliasRegistry.registerAlias("PERPETUAL", PerpetualCache.class);
        typeAliasRegistry.registerAlias("FIFO", FifoCache.class);
        typeAliasRegistry.registerAlias("LRU", LruCache.class);
        typeAliasRegistry.registerAlias("SOFT", SoftCache.class);
        typeAliasRegistry.registerAlias("WEAK", WeakCache.class);

        typeAliasRegistry.registerAlias("DB_VENDOR", VendorDatabaseIdProvider.class);

        typeAliasRegistry.registerAlias("XML", XMLLanguageDriver.class);
        typeAliasRegistry.registerAlias("RAW", RawLanguageDriver.class);

        typeAliasRegistry.registerAlias("SLF4J", Slf4jImpl.class);
        typeAliasRegistry.registerAlias("COMMONS_LOGGING", JakartaCommonsLoggingImpl.class);
        typeAliasRegistry.registerAlias("LOG4J", Log4jImpl.class);
        typeAliasRegistry.registerAlias("LOG4J2", Log4j2Impl.class);
        typeAliasRegistry.registerAlias("JDK_LOGGING", Jdk14LoggingImpl.class);
        typeAliasRegistry.registerAlias("STDOUT_LOGGING", StdOutImpl.class);
        typeAliasRegistry.registerAlias("NO_LOGGING", NoLoggingImpl.class);

        typeAliasRegistry.registerAlias("CGLIB", CglibProxyFactory.class);
        typeAliasRegistry.registerAlias("JAVASSIST", JavassistProxyFactory.class);

        languageRegistry.setDefaultDriverClass(XMLLanguageDriver.class);
        languageRegistry.register(RawLanguageDriver.class);
    }

    public String getLogPrefix() {
        return logPrefix;
    }

    public void setLogPrefix(String logPrefix) {
        this.logPrefix = logPrefix;
    }

    public Class getLogImpl() {
        return logImpl;
    }

    public void setLogImpl(Class logImpl) {
        if (logImpl != null) {
            this.logImpl = logImpl;
            LogFactory.useCustomLogging(this.logImpl);
        }
    }

    public Class getVfsImpl() {
        return this.vfsImpl;
    }

    public void setVfsImpl(Class vfsImpl) {
        if (vfsImpl != null) {
            this.vfsImpl = vfsImpl;
            VFS.addImplClass(this.vfsImpl);
        }
    }

    public boolean isCallSettersOnNulls() {
        return callSettersOnNulls;
    }

    public void setCallSettersOnNulls(boolean callSettersOnNulls) {
        this.callSettersOnNulls = callSettersOnNulls;
    }

    public boolean isUseActualParamName() {
        return useActualParamName;
    }

    public void setUseActualParamName(boolean useActualParamName) {
        this.useActualParamName = useActualParamName;
    }

    public boolean isReturnInstanceForEmptyRow() {
        return returnInstanceForEmptyRow;
    }

    public void setReturnInstanceForEmptyRow(boolean returnEmptyInstance) {
        this.returnInstanceForEmptyRow = returnEmptyInstance;
    }

    public String getDatabaseId() {
        return databaseId;
    }

    public void setDatabaseId(String databaseId) {
        this.databaseId = databaseId;
    }

    public Class getConfigurationFactory() {
        return configurationFactory;
    }

    public void setConfigurationFactory(Class configurationFactory) {
        this.configurationFactory = configurationFactory;
    }

    public boolean isSafeResultHandlerEnabled() {
        return safeResultHandlerEnabled;
    }

    public void setSafeResultHandlerEnabled(boolean safeResultHandlerEnabled) {
        this.safeResultHandlerEnabled = safeResultHandlerEnabled;
    }

    public boolean isSafeRowBoundsEnabled() {
        return safeRowBoundsEnabled;
    }

    public void setSafeRowBoundsEnabled(boolean safeRowBoundsEnabled) {
        this.safeRowBoundsEnabled = safeRowBoundsEnabled;
    }

    public boolean isMapUnderscoreToCamelCase() {
        return mapUnderscoreToCamelCase;
    }

    public void setMapUnderscoreToCamelCase(boolean mapUnderscoreToCamelCase) {
        this.mapUnderscoreToCamelCase = mapUnderscoreToCamelCase;
    }

    public void addLoadedResource(String resource) {
        loadedResources.add(resource);
    }

    public void addLoadedJpaMapper(Class jpaMapper) {
        loadedJpaMappers.add(jpaMapper.getCanonicalName());
    }

    public boolean isResourceLoaded(String resource) {
        return loadedResources.contains(resource);
    }

    public boolean isJpaMapperLoaded(Class jpaMapper) {
        return loadedJpaMappers.contains(jpaMapper.getCanonicalName());
    }

    public Environment getEnvironment() {
        return environment;
    }

    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    public AutoMappingBehavior getAutoMappingBehavior() {
        return autoMappingBehavior;
    }

    public void setAutoMappingBehavior(AutoMappingBehavior autoMappingBehavior) {
        this.autoMappingBehavior = autoMappingBehavior;
    }

    /**
     * @since 3.4.0
     */
    public AutoMappingUnknownColumnBehavior getAutoMappingUnknownColumnBehavior() {
        return autoMappingUnknownColumnBehavior;
    }

    /**
     * @since 3.4.0
     */
    public void setAutoMappingUnknownColumnBehavior(AutoMappingUnknownColumnBehavior autoMappingUnknownColumnBehavior) {
        this.autoMappingUnknownColumnBehavior = autoMappingUnknownColumnBehavior;
    }

    public boolean isLazyLoadingEnabled() {
        return lazyLoadingEnabled;
    }

    public void setLazyLoadingEnabled(boolean lazyLoadingEnabled) {
        this.lazyLoadingEnabled = lazyLoadingEnabled;
    }

    public ProxyFactory getProxyFactory() {
        return proxyFactory;
    }

    public void setProxyFactory(ProxyFactory proxyFactory) {
        if (proxyFactory == null) {
            proxyFactory = new JavassistProxyFactory();
        }
        this.proxyFactory = proxyFactory;
    }

    public boolean isAggressiveLazyLoading() {
        return aggressiveLazyLoading;
    }

    public void setAggressiveLazyLoading(boolean aggressiveLazyLoading) {
        this.aggressiveLazyLoading = aggressiveLazyLoading;
    }

    public boolean isMultipleResultSetsEnabled() {
        return multipleResultSetsEnabled;
    }

    public void setMultipleResultSetsEnabled(boolean multipleResultSetsEnabled) {
        this.multipleResultSetsEnabled = multipleResultSetsEnabled;
    }

    public Set getLazyLoadTriggerMethods() {
        return lazyLoadTriggerMethods;
    }

    public void setLazyLoadTriggerMethods(Set lazyLoadTriggerMethods) {
        this.lazyLoadTriggerMethods = lazyLoadTriggerMethods;
    }

    public boolean isUseGeneratedKeys() {
        return useGeneratedKeys;
    }

    public void setUseGeneratedKeys(boolean useGeneratedKeys) {
        this.useGeneratedKeys = useGeneratedKeys;
    }

    public ExecutorType getDefaultExecutorType() {
        return defaultExecutorType;
    }

    public void setDefaultExecutorType(ExecutorType defaultExecutorType) {
        this.defaultExecutorType = defaultExecutorType;
    }

    public boolean isCacheEnabled() {
        return cacheEnabled;
    }

    public void setCacheEnabled(boolean cacheEnabled) {
        this.cacheEnabled = cacheEnabled;
    }

    public Integer getDefaultStatementTimeout() {
        return defaultStatementTimeout;
    }

    public void setDefaultStatementTimeout(Integer defaultStatementTimeout) {
        this.defaultStatementTimeout = defaultStatementTimeout;
    }

    /**
     * @since 3.3.0
     */
    public Integer getDefaultFetchSize() {
        return defaultFetchSize;
    }

    /**
     * @since 3.3.0
     */
    public void setDefaultFetchSize(Integer defaultFetchSize) {
        this.defaultFetchSize = defaultFetchSize;
    }

    public boolean isUseColumnLabel() {
        return useColumnLabel;
    }

    public void setUseColumnLabel(boolean useColumnLabel) {
        this.useColumnLabel = useColumnLabel;
    }

    public LocalCacheScope getLocalCacheScope() {
        return localCacheScope;
    }

    public void setLocalCacheScope(LocalCacheScope localCacheScope) {
        this.localCacheScope = localCacheScope;
    }

    public JdbcType getJdbcTypeForNull() {
        return jdbcTypeForNull;
    }

    public void setJdbcTypeForNull(JdbcType jdbcTypeForNull) {
        this.jdbcTypeForNull = jdbcTypeForNull;
    }

    public Properties getVariables() {
        return variables;
    }

    public void setVariables(Properties variables) {
        this.variables = variables;
    }

    public TypeHandlerRegistry getTypeHandlerRegistry() {
        return typeHandlerRegistry;
    }

    /**
     * Set a default {@link TypeHandler} class for {@link Enum}.
     * A default {@link TypeHandler} is {@link org.apache.ibatis.type.EnumTypeHandler}.
     * @param typeHandler a type handler class for {@link Enum}
     * @since 3.4.5
     */
    public void setDefaultEnumTypeHandler(Class typeHandler) {
        if (typeHandler != null) {
            getTypeHandlerRegistry().setDefaultEnumTypeHandler(typeHandler);
        }
    }

    public TypeAliasRegistry getTypeAliasRegistry() {
        return typeAliasRegistry;
    }

    /**
     * @since 3.2.2
     */
    public MapperRegistry getMapperRegistry() {
        return mapperRegistry;
    }

    public ReflectorFactory getReflectorFactory() {
        return reflectorFactory;
    }

    public void setReflectorFactory(ReflectorFactory reflectorFactory) {
        this.reflectorFactory = reflectorFactory;
    }

    public ObjectFactory getObjectFactory() {
        return objectFactory;
    }

    public void setObjectFactory(ObjectFactory objectFactory) {
        this.objectFactory = objectFactory;
    }

    public ObjectWrapperFactory getObjectWrapperFactory() {
        return objectWrapperFactory;
    }

    public void setObjectWrapperFactory(ObjectWrapperFactory objectWrapperFactory) {
        this.objectWrapperFactory = objectWrapperFactory;
    }

    /**
     * @since 3.2.2
     */
    public List getInterceptors() {
        return interceptorChain.getInterceptors();
    }

    public LanguageDriverRegistry getLanguageRegistry() {
        return languageRegistry;
    }

    public void setDefaultScriptingLanguage(Class driver) {
        if (driver == null) {
            driver = XMLLanguageDriver.class;
        }
        getLanguageRegistry().setDefaultDriverClass(driver);
    }

    public LanguageDriver getDefaultScriptingLanguageInstance() {
        return languageRegistry.getDefaultDriver();
    }

    /** @deprecated Use {@link #getDefaultScriptingLanguageInstance()} */
    @Deprecated
    public LanguageDriver getDefaultScriptingLanuageInstance() {
        return getDefaultScriptingLanguageInstance();
    }

    public MetaObject newMetaObject(Object object) {
        return MetaObject.forObject(object, objectFactory, objectWrapperFactory, reflectorFactory);
    }

    public ParameterHandler newParameterHandler(MappedStatement mappedStatement, Object parameterObject, BoundSql boundSql) {
        ParameterHandler parameterHandler = mappedStatement.getLang().createParameterHandler(mappedStatement, parameterObject, boundSql);
        parameterHandler = (ParameterHandler) interceptorChain.pluginAll(parameterHandler);
        return parameterHandler;
    }

    public ResultSetHandler newResultSetHandler(Executor executor, MappedStatement mappedStatement, RowBounds rowBounds, ParameterHandler parameterHandler,
                                                ResultHandler resultHandler, BoundSql boundSql) {
        ResultSetHandler resultSetHandler = new DefaultResultSetHandler(executor, mappedStatement, parameterHandler, resultHandler, boundSql, rowBounds);
        resultSetHandler = (ResultSetHandler) interceptorChain.pluginAll(resultSetHandler);
        return resultSetHandler;
    }

    public StatementHandler newStatementHandler(Executor executor, MappedStatement mappedStatement, Object parameterObject, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) {
        StatementHandler statementHandler = new RoutingStatementHandler(executor, mappedStatement, parameterObject, rowBounds, resultHandler, boundSql);
        statementHandler = (StatementHandler) interceptorChain.pluginAll(statementHandler);
        return statementHandler;
    }

    public Executor newExecutor(Transaction transaction) {
        return newExecutor(transaction, defaultExecutorType);
    }

    public Executor newExecutor(Transaction transaction, ExecutorType executorType) {
        executorType = executorType == null ? defaultExecutorType : executorType;
        executorType = executorType == null ? ExecutorType.SIMPLE : executorType;
        Executor executor;
        if (ExecutorType.BATCH == executorType) {
            executor = new BatchExecutor(this, transaction);
        } else if (ExecutorType.REUSE == executorType) {
            executor = new ReuseExecutor(this, transaction);
        } else {
            executor = new SimpleExecutor(this, transaction);
        }
        if (cacheEnabled) {
            executor = new CachingExecutor(executor);
        }
        executor = (Executor) interceptorChain.pluginAll(executor);
        return executor;
    }

    public void addKeyGenerator(String id, KeyGenerator keyGenerator) {
        keyGenerators.put(id, keyGenerator);
    }

    public Collection getKeyGeneratorNames() {
        return keyGenerators.keySet();
    }

    public Collection getKeyGenerators() {
        return keyGenerators.values();
    }

    public KeyGenerator getKeyGenerator(String id) {
        return keyGenerators.get(id);
    }

    public boolean hasKeyGenerator(String id) {
        return keyGenerators.containsKey(id);
    }

    public void addCache(Cache cache) {
        caches.put(cache.getId(), cache);
    }

    public Collection getCacheNames() {
        return caches.keySet();
    }

    public Collection getCaches() {
        return caches.values();
    }

    public Cache getCache(String id) {
        return caches.get(id);
    }

    public boolean hasCache(String id) {
        return caches.containsKey(id);
    }

    public void addResultMap(ResultMap rm) {
        resultMaps.put(rm.getId(), rm);
        checkLocallyForDiscriminatedNestedResultMaps(rm);
        checkGloballyForDiscriminatedNestedResultMaps(rm);
    }

    public Collection getResultMapNames() {
        return resultMaps.keySet();
    }

    public Collection getResultMaps() {
        return resultMaps.values();
    }

    public ResultMap getResultMap(String id) {
        return resultMaps.get(id);
    }

    public boolean hasResultMap(String id) {
        return resultMaps.containsKey(id);
    }

    public void addParameterMap(ParameterMap pm) {
        parameterMaps.put(pm.getId(), pm);
    }

    public Collection getParameterMapNames() {
        return parameterMaps.keySet();
    }

    public Collection getParameterMaps() {
        return parameterMaps.values();
    }

    public ParameterMap getParameterMap(String id) {
        return parameterMaps.get(id);
    }

    public boolean hasParameterMap(String id) {
        return parameterMaps.containsKey(id);
    }

    public void addMappedStatement(MappedStatement ms) {
        mappedStatements.put(ms.getId(), ms);
    }

    public Collection getMappedStatementNames() {
        buildAllStatements();
        return mappedStatements.keySet();
    }

    public Collection getMappedStatements() {
        buildAllStatements();
        return mappedStatements.values();
    }

    public Collection getIncompleteStatements() {
        return incompleteStatements;
    }

    public void addIncompleteStatement(XMLStatementBuilder incompleteStatement) {
        incompleteStatements.add(incompleteStatement);
    }

    public Collection getIncompleteCacheRefs() {
        return incompleteCacheRefs;
    }

    public void addIncompleteCacheRef(CacheRefResolver incompleteCacheRef) {
        incompleteCacheRefs.add(incompleteCacheRef);
    }

    public Collection getIncompleteResultMaps() {
        return incompleteResultMaps;
    }

    public void addIncompleteResultMap(ResultMapResolver resultMapResolver) {
        incompleteResultMaps.add(resultMapResolver);
    }

    public void addIncompleteMethod(MethodResolver builder) {
        incompleteMethods.add(builder);
    }

    public Collection getIncompleteMethods() {
        return incompleteMethods;
    }

    public MappedStatement getMappedStatement(String id) {
        return this.getMappedStatement(id, true);
    }

    public MappedStatement getMappedStatement(String id, boolean validateIncompleteStatements) {
        if (validateIncompleteStatements) {
            buildAllStatements();
        }
        return mappedStatements.get(id);
    }

    public Map getSqlFragments() {
        return sqlFragments;
    }

    public void addInterceptor(Interceptor interceptor) {
        interceptorChain.addInterceptor(interceptor);
    }

    public void addMappers(String packageName, Class superType) {
        mapperRegistry.addMappers(packageName, superType);
    }

    public void addMappers(String packageName) {
        mapperRegistry.addMappers(packageName);
    }

    public  void addMapper(Class type) {
        mapperRegistry.addMapper(type);
    }

    public  T getMapper(Class type, SqlSession sqlSession) {
        return mapperRegistry.getMapper(type, sqlSession);
    }

    public boolean hasMapper(Class type) {
        return mapperRegistry.hasMapper(type);
    }

    public boolean hasStatement(String statementName) {
        return hasStatement(statementName, true);
    }

    public boolean hasStatement(String statementName, boolean validateIncompleteStatements) {
        if (validateIncompleteStatements) {
            buildAllStatements();
        }
        return mappedStatements.containsKey(statementName);
    }

    public void addCacheRef(String namespace, String referencedNamespace) {
        cacheRefMap.put(namespace, referencedNamespace);
    }

    /*
     * Parses all the unprocessed statement nodes in the cache. It is recommended
     * to call this method once all the mappers are added as it provides fail-fast
     * statement validation.
     */
    protected void buildAllStatements() {
        if (!incompleteResultMaps.isEmpty()) {
            synchronized (incompleteResultMaps) {
                // This always throws a BuilderException.
                incompleteResultMaps.iterator().next().resolve();
            }
        }
        if (!incompleteCacheRefs.isEmpty()) {
            synchronized (incompleteCacheRefs) {
                // This always throws a BuilderException.
                incompleteCacheRefs.iterator().next().resolveCacheRef();
            }
        }
        if (!incompleteStatements.isEmpty()) {
            synchronized (incompleteStatements) {
                // This always throws a BuilderException.
                incompleteStatements.iterator().next().parseStatementNode();
            }
        }
        if (!incompleteMethods.isEmpty()) {
            synchronized (incompleteMethods) {
                // This always throws a BuilderException.
                incompleteMethods.iterator().next().resolve();
            }
        }
    }

    /*
     * Extracts namespace from fully qualified statement id.
     *
     * @param statementId
     * @return namespace or null when id does not contain period.
     */
    protected String extractNamespace(String statementId) {
        int lastPeriod = statementId.lastIndexOf('.');
        return lastPeriod > 0 ? statementId.substring(0, lastPeriod) : null;
    }

    // Slow but a one time cost. A better solution is welcome.
    protected void checkGloballyForDiscriminatedNestedResultMaps(ResultMap rm) {
        if (rm.hasNestedResultMaps()) {
            for (Map.Entry entry : resultMaps.entrySet()) {
                Object value = entry.getValue();
                if (value instanceof ResultMap) {
                    ResultMap entryResultMap = (ResultMap) value;
                    if (!entryResultMap.hasNestedResultMaps() && entryResultMap.getDiscriminator() != null) {
                        Collection discriminatedResultMapNames = entryResultMap.getDiscriminator().getDiscriminatorMap().values();
                        if (discriminatedResultMapNames.contains(rm.getId())) {
                            entryResultMap.forceNestedResultMaps();
                        }
                    }
                }
            }
        }
    }

    // Slow but a one time cost. A better solution is welcome.
    protected void checkLocallyForDiscriminatedNestedResultMaps(ResultMap rm) {
        if (!rm.hasNestedResultMaps() && rm.getDiscriminator() != null) {
            for (Map.Entry entry : rm.getDiscriminator().getDiscriminatorMap().entrySet()) {
                String discriminatedResultMapName = entry.getValue();
                if (hasResultMap(discriminatedResultMapName)) {
                    ResultMap discriminatedResultMap = resultMaps.get(discriminatedResultMapName);
                    if (discriminatedResultMap.hasNestedResultMaps()) {
                        rm.forceNestedResultMaps();
                        break;
                    }
                }
            }
        }
    }

    protected static class StrictMap extends HashMap {

        private static final long serialVersionUID = -4950446264854982944L;
        private final String name;

        public StrictMap(String name, int initialCapacity, float loadFactor) {
            super(initialCapacity, loadFactor);
            this.name = name;
        }

        public StrictMap(String name, int initialCapacity) {
            super(initialCapacity);
            this.name = name;
        }

        public StrictMap(String name) {
            super();
            this.name = name;
        }

        public StrictMap(String name, Map m) {
            super(m);
            this.name = name;
        }

        @SuppressWarnings("unchecked")
        public V put(String key, V value) {
            if (containsKey(key)) {
                throw new IllegalArgumentException(name + " already contains value for " + key);
            }
            if (key.contains(".")) {
                final String shortKey = getShortName(key);
                if (super.get(shortKey) == null) {
                    super.put(shortKey, value);
                } else {
                    super.put(shortKey, (V) new Ambiguity(shortKey));
                }
            }
            return super.put(key, value);
        }

        public V get(Object key) {
            V value = super.get(key);
            if (value == null) {
                throw new IllegalArgumentException(name + " does not contain value for " + key);
            }
            if (value instanceof Ambiguity) {
                throw new IllegalArgumentException(((Ambiguity) value).getSubject() + " is ambiguous in " + name
                        + " (try using the full name including the namespace, or rename one of the entries)");
            }
            return value;
        }

        private String getShortName(String key) {
            final String[] keyParts = key.split("\\.");
            return keyParts[keyParts.length - 1];
        }

        protected static class Ambiguity {
            final private String subject;

            public Ambiguity(String subject) {
                this.subject = subject;
            }

            public String getSubject() {
                return subject;
            }
        }
    }

}