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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.
/*
* Copyright 2009-2012 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.Arrays;
import java.util.HashSet;
import java.util.Set;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.mapping.ResultSetType;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeAliasRegistry;
import org.apache.ibatis.type.TypeHandler;
import org.apache.ibatis.type.TypeHandlerRegistry;
/**
* @author Clinton Begin
*/
public abstract class BaseBuilder {
protected final Configuration configuration;
protected final TypeAliasRegistry typeAliasRegistry;
protected final TypeHandlerRegistry typeHandlerRegistry;
public BaseBuilder(Configuration configuration) {
this.configuration = configuration;
this.typeAliasRegistry = this.configuration.getTypeAliasRegistry();
this.typeHandlerRegistry = this.configuration.getTypeHandlerRegistry();
}
public Configuration getConfiguration() {
return configuration;
}
protected Boolean booleanValueOf(String value, Boolean defaultValue) {
return value == null ? defaultValue : Boolean.valueOf(value);
}
protected Integer integerValueOf(String value, Integer defaultValue) {
return value == null ? defaultValue : Integer.valueOf(value);
}
protected Set stringSetValueOf(String value, String defaultValue) {
value = (value == null ? defaultValue : value);
return new HashSet(Arrays.asList(value.split(",")));
}
protected JdbcType resolveJdbcType(String alias) {
if (alias == null) return null;
try {
return JdbcType.valueOf(alias);
} catch (IllegalArgumentException e) {
throw new BuilderException("Error resolving JdbcType. Cause: " + e, e);
}
}
protected ResultSetType resolveResultSetType(String alias) {
if (alias == null) return null;
try {
return ResultSetType.valueOf(alias);
} catch (IllegalArgumentException e) {
throw new BuilderException("Error resolving ResultSetType. Cause: " + e, e);
}
}
protected ParameterMode resolveParameterMode(String alias) {
if (alias == null) return null;
try {
return ParameterMode.valueOf(alias);
} catch (IllegalArgumentException e) {
throw new BuilderException("Error resolving ParameterMode. Cause: " + e, e);
}
}
protected Object createInstance(String alias) {
Class> clazz = resolveClass(alias);
if (clazz == null) return null;
try {
return resolveClass(alias).newInstance();
} catch (Exception e) {
throw new BuilderException("Error creating instance. Cause: " + e, e);
}
}
protected Class> resolveClass(String alias) {
if (alias == null) return null;
try {
return resolveAlias(alias);
} catch (Exception e) {
throw new BuilderException("Error resolving class. Cause: " + e, e);
}
}
protected TypeHandler> resolveTypeHandler(Class> javaType, String typeHandlerAlias) {
if (typeHandlerAlias == null) return null;
Class> type = resolveClass(typeHandlerAlias);
if (type != null && !TypeHandler.class.isAssignableFrom(type)) {
throw new BuilderException("Type " + type.getName() + " is not a valid TypeHandler because it does not implement TypeHandler interface");
}
@SuppressWarnings( "unchecked" ) // already verified it is a TypeHandler
Class extends TypeHandler>> typeHandlerType = (Class extends TypeHandler>>) type;
return resolveTypeHandler(javaType, typeHandlerType);
}
protected TypeHandler> resolveTypeHandler(Class> javaType, Class extends TypeHandler>> typeHandlerType) {
if (typeHandlerType == null) return null;
// javaType ignored for injected handlers see issue #746 for full detail
TypeHandler> handler = typeHandlerRegistry.getMappingTypeHandler(typeHandlerType);
if (handler == null) {
// not in registry, create a new one
handler = typeHandlerRegistry.getInstance(javaType, typeHandlerType);
}
return handler;
}
protected Class> resolveAlias(String alias) {
return typeAliasRegistry.resolveAlias(alias);
}
}
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