补充文档注释

src/main/java/xyz/zhouxy/jdbc/DbRecord.java

@@ -16,49 +16,78 @@
 
 package xyz.zhouxy.jdbc;
 
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.OptionalDouble;
+import java.util.OptionalInt;
+import java.util.OptionalLong;
+
+import javax.annotation.Nonnull;
+
 import com.google.common.annotations.Beta;
-import com.google.common.base.Preconditions;
+
 import xyz.zhouxy.plusone.commons.collection.AbstractMapWrapper;
+import xyz.zhouxy.plusone.commons.util.AssertTools;
 import xyz.zhouxy.plusone.commons.util.OptionalTools;
 import xyz.zhouxy.plusone.commons.util.StringTools;
 
-import java.util.*;
-
+/**
+ * DbRecord
+ *
+ * <p>
+ * 封装 Map<String, Object>，表示一条 DB 记录
+ * </p>
+ *
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ * @since 1.0.0
+ */
 @Beta
 public class DbRecord extends AbstractMapWrapper<String, Object, DbRecord> {
 
     public DbRecord() {
-        super(new HashMap<>(), k -> Preconditions.checkArgument(StringTools.isNotBlank(k), "Key must has text."), null);
+        super(new HashMap<>(),
+                k -> AssertTools.checkArgument(StringTools.isNotBlank(k), "Key must has text."),
+                null);
     }
 
     public DbRecord(Map<String, Object> map) {
-        super(map, k -> Preconditions.checkArgument(StringTools.isNotBlank(k), "Key must has text."), null);
+        super(map,
+                k -> AssertTools.checkArgument(StringTools.isNotBlank(k), "Key must has text."),
+                null);
     }
 
+    /**
+     * 将值强转为 {@link String}，并放在 {@link Optional} 中。
+     * 如果 {@code key} 存在，而值不存在，则返回 {@link Optional#empty()}。
+     */
     public Optional<String> getValueAsString(String key) {
         return this.getAndConvert(key);
     }
 
-    public <T> List<T> getValueAsList(String key) {
-        return this.<Collection<T>>getAndConvert(key)
-                .map(l -> (l instanceof List) ? (List<T>) l : new ArrayList<>(l))
-                .orElse(Collections.emptyList());
-    }
-
-    public <T> Set<T> getValueAsSet(String key) {
-        return this.<Collection<T>>getAndConvert(key)
-                .map(l -> (l instanceof Set) ? (Set<T>) l : new HashSet<>(l))
-                .orElse(Collections.emptySet());
-    }
-
+    /**
+     * 将值强转为 {@code int}，并放在 {@link OptionalInt} 中。
+     * 如果 {@code key} 存在，而值不存在，则返回 {@link OptionalInt#empty()}。
+     */
+    @Nonnull
     public OptionalInt getValueAsInt(String key) {
         return OptionalTools.toOptionalInt(this.getAndConvert(key));
     }
 
+    /**
+     * 将值强转为 {@code long}，并放在 {@link OptionalLong} 中。
+     * 如果 {@code key} 存在，而值不存在，则返回 {@link OptionalLong#empty()}。
+     */
+    @Nonnull
     public OptionalLong getValueAsLong(String key) {
         return OptionalTools.toOptionalLong(this.getAndConvert(key));
     }
 
+    /**
+     * 将值强转为 {@code double}，并放在 {@link OptionalDouble} 中。
+     * 如果 {@code key} 存在，而值不存在，则返回 {@link OptionalDouble#empty()}。
+     */
+    @Nonnull
     public OptionalDouble getValueAsDouble(String key) {
         return OptionalTools.toOptionalDouble(this.getAndConvert(key));
     }

src/main/java/xyz/zhouxy/jdbc/DefaultBeanRowMapper.java

@@ -35,9 +35,28 @@ import javax.annotation.Nullable;
 
 import com.google.common.base.CaseFormat;
 
+import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
+
+/**
+ * DefaultBeanRowMapper
+ *
+ * <p>
+ * 默认实现的将 {@link ResultSet} 转换为 Java Bean 的 {@link RowMapper}。
+ * </p>
+ *
+ * <p>
+ * <b>NOTE: 使用反射获取类型信息，也是使用反射调用无参构造器和 {@code setter} 方法。
+ * 实际使用中还是建议针对目标类型自定义 {@link RowMapper}。</b>
+ * </p>
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ * @since 1.0.0
+ */
 public class DefaultBeanRowMapper<T> implements RowMapper<T> {
 
+    /** Bean 的无参构造器 */
     private final Constructor<T> constructor;
+
+    /** 列名到属性的映射 */
     private final Map<String, PropertyDescriptor> colPropertyMap;
 
     private DefaultBeanRowMapper(Constructor<T> constructor, Map<String, PropertyDescriptor> colPropertyMap) {
@@ -45,10 +64,29 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
         this.colPropertyMap = colPropertyMap;
     }
 
+    /**
+     * 创建一个 DefaultBeanRowMapper
+     *
+     * @param <T>      Bean 类型
+     * @param beanType Bean 类型
+     * @return DefaultBeanRowMapper 对象
+     * @throws SQLException 创建 DefaultBeanRowMapper 出现错误的异常时抛出
+     */
+    @StaticFactoryMethod(DefaultBeanRowMapper.class)
     public static <T> DefaultBeanRowMapper<T> of(Class<T> beanType) throws SQLException {
         return of(beanType, null);
     }
 
+    /**
+     * 创建一个 DefaultBeanRowMapper
+     *
+     * @param <T>            Bean 类型
+     * @param beanType       Bean 类型
+     * @param propertyColMap Bean 字段与列名的映射关系。key 是字段，value 是列名。
+     * @return DefaultBeanRowMapper 对象
+     * @throws SQLException 创建 DefaultBeanRowMapper 出现错误的异常时抛出
+     */
+    @StaticFactoryMethod(DefaultBeanRowMapper.class)
     public static <T> DefaultBeanRowMapper<T> of(Class<T> beanType, @Nullable Map<String, String> propertyColMap)
             throws SQLException {
         try {
@@ -60,6 +98,7 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
             BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
             PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 
+            // Bean 的属性名为小驼峰，对应的列名为下划线
             Function<? super PropertyDescriptor, String> keyMapper;
             if (propertyColMap == null || propertyColMap.isEmpty()) {
                 keyMapper = p -> CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, p.getName());
@@ -84,13 +123,17 @@ public class DefaultBeanRowMapper<T> implements RowMapper<T> {
         }
     }
 
+    /** {@inheritDoc} */
     @Override
     public T mapRow(ResultSet rs, int rowNumber) throws SQLException {
         try {
+            // 调用无参构造器创建实例
             T newInstance = this.constructor.newInstance();
             ResultSetMetaData metaData = rs.getMetaData();
+            // 遍历结果的每一列
             for (int i = 1; i <= metaData.getColumnCount(); i++) {
                 String colName = metaData.getColumnName(i);
+                // 获取查询结果列名对应的属性，调用 setter
                 PropertyDescriptor propertyDescriptor = this.colPropertyMap.get(colName);
                 if (propertyDescriptor != null) {
                     Method setter = propertyDescriptor.getWriteMethod();

src/main/java/xyz/zhouxy/jdbc/ParamBuilder.java

@@ -27,12 +27,21 @@ import java.util.OptionalLong;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-import com.google.common.base.Preconditions;
-
 import xyz.zhouxy.plusone.commons.collection.CollectionTools;
 import xyz.zhouxy.plusone.commons.util.ArrayTools;
+import xyz.zhouxy.plusone.commons.util.AssertTools;
 import xyz.zhouxy.plusone.commons.util.OptionalTools;
 
+/**
+ * ParamBuilder
+ *
+ * <p>
+ * JDBC 参数构造器，将数据转换为 {@code Object[]} 类型，以传给 {@link PreparedStatement}
+ * </p>
+ *
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ * @since 1.0.0
+ */
 public class ParamBuilder {
     public static final Object[] EMPTY_OBJECT_ARRAY = {};
 
@@ -60,8 +69,8 @@ public class ParamBuilder {
     }
 
     public static <T> List<Object[]> buildBatchParams(final Collection<T> c, final Function<T, Object[]> func) {
-        Preconditions.checkNotNull(c, "The collection can not be null.");
-        Preconditions.checkNotNull(func, "The func can not be null.");
+        AssertTools.checkNotNull(c, "The collection can not be null.");
+        AssertTools.checkNotNull(func, "The func can not be null.");
         if (CollectionTools.isEmpty(c)) {
             return Collections.emptyList();
         }

src/main/java/xyz/zhouxy/jdbc/ResultHandler.java

@@ -19,7 +19,21 @@ package xyz.zhouxy.jdbc;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 
+/**
+ * ResultHandler
+ *
+ * <p>
+ * 处理 {@link ResultSet}
+ * </p>
+ *
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ * @since 1.0.0
+ */
 @FunctionalInterface
 public interface ResultHandler<T> {
+
+    /**
+     * 将 {@link ResultSet} 转换为指定类型的对象
+     */
     T handle(ResultSet resultSet) throws SQLException;
 }

src/main/java/xyz/zhouxy/jdbc/RowMapper.java

@@ -22,10 +22,21 @@ import java.sql.SQLException;
 import java.util.HashMap;
 import java.util.Map;
 
+/**
+ * RowMapper
+ *
+ * <p>
+ * {@link ResultSet} 中每一行数据的处理逻辑。
+ * </p>
+ *
+ * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
+ * @since 1.0.0
+ */
 @FunctionalInterface
 public interface RowMapper<T> {
     T mapRow(ResultSet rs, int rowNumber) throws SQLException;
 
+    /** 每一行数据转换为 {@link HashMap} */
     public static final RowMapper<Map<String, Object>> HASH_MAP_MAPPER = (rs, rowNumber) -> {
         Map<String, Object> result = new HashMap<>();
         ResultSetMetaData metaData = rs.getMetaData();
@@ -37,13 +48,16 @@ public interface RowMapper<T> {
         return result;
     };
 
+    /** 每一行数据转换为 {@link DbRecord} */
     public static final RowMapper<DbRecord> RECORD_MAPPER =
             (rs, rowNumber) -> new DbRecord(HASH_MAP_MAPPER.mapRow(rs, rowNumber));
 
+    /** 默认实现的将 {@link ResultSet} 转换为 Java Bean 的 {@link RowMapper}。 */
     public static <T> RowMapper<T> beanRowMapper(Class<T> beanType) throws SQLException {
         return DefaultBeanRowMapper.of(beanType);
     }
 
+    /** 默认实现的将 {@link ResultSet} 转换为 Java Bean 的 {@link RowMapper}。 */
     public static <T> RowMapper<T> beanRowMapper(Class<T> beanType, Map<String, String> propertyColMap)
             throws SQLException {
         return DefaultBeanRowMapper.of(beanType, propertyColMap);