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SqlWhereBuffer.java
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SqlWhereBuffer.java
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import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import org.apache.commons.collections.CollectionUtils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* Created by chao li on 16/12/14.
*/
public class SqlWhereBuffer {
public static SqlWhereBuffer.Where builder() {
return new Builder();
}
static class Builder implements SqlWhereBuffer.Order, SqlWhereBuffer.Where {
private List<String> sql = new ArrayList<>();
private Map<String, Object> params = new HashMap<>();
private String orderBy = " ";
private String limit = " ";
private String in = " ";
private List<SqlMapperPlugin> sqlMapperPlugins;
public Builder() {
//添加基本类型默认的插件
sqlMapperPlugins = Lists.newArrayList();
this.mapperPlugins(SqlMapperPlugin.EnumSqlPlugin)
.mapperPlugins(SqlMapperPlugin.BooleanSqlPlugin);
}
public Builder mapperPlugins(SqlMapperPlugin sqlMapperPlugin) {
if (CollectionUtils.isEmpty(sqlMapperPlugins)) {
sqlMapperPlugins = Lists.newArrayList();
}
sqlMapperPlugins.add(sqlMapperPlugin);
return this;
}
@Override
public SqlWhereBuffer.Where ifPresent(Object value, String sql) {
Optional.ofNullable(value)
.ifPresent(val -> {
this.sql.add(sql);
Pattern pattern = Pattern.compile(":([a-z,A-Z,\\w,_]*)");
Matcher matcher = pattern.matcher(sql);
if (!matcher.find()) {
throw new IllegalArgumentException(sql + " don't include :name");
}
Optional<SqlMapperPlugin> mapper = sqlMapperPlugins.stream()
.filter(sqlMapperPlugin -> sqlMapperPlugin.test(val))
.findFirst();
if (mapper.isPresent()) {
params.putAll(mapper.get()
.getParams(matcher.group(1), value));
} else {
params.put(matcher.group(1), value);
}
});
return this;
}
@Override
public SqlWhereBuffer.Order orderBy(String field) {
orderBy += "ORDER BY " + field;
return this;
}
@Override
public SqlWhereBuffer.Where limit(int offset, int count) {
limit += "limit " + offset + "," + count;
return this;
}
@Override
public Where in(List<Object> values, String sql) {
return null;
}
@Override
public String sql() {
if (sql.isEmpty() || params.isEmpty()) {
return "";
} else {
return " WHERE " + sql.stream()
.collect(Collectors.joining(" AND ")) + orderBy + limit;
}
}
@Override
public ImmutableMap<String, Object> params() {
return ImmutableMap.copyOf(params);
}
@Override
public SqlWhereBuffer.Where desc() {
orderBy += " DESC";
return this;
}
@Override
public SqlWhereBuffer.Where asc() {
return this;
}
}
public static class SqlMapperPlugin {
private final Predicate<Object> predicate;
private final ParamValue paramValue;
private SqlMapperPlugin(Predicate<Object> predicate,
ParamValue paramValue) {
this.predicate = predicate;
this.paramValue = paramValue;
}
static SqlMapperPlugin EnumSqlPlugin = of(Enum.class).columnValue((value, sql) ->
Collections.singletonMap(sql, getEnumValue(value))
);
static SqlMapperPlugin BooleanSqlPlugin = of(Boolean.class).columnValue((value, sql) ->
Collections.singletonMap(sql, ((boolean) value) ? 1 : 0)
);
public static SqlMapperPlugin.MapperPluginsBuilder of(Predicate<Object> predicate) {
return new MapperPluginsBuilder(predicate);
}
public static SqlMapperPlugin.MapperPluginsBuilder of(Class clazz) {
return of((pd) -> {
return clazz.isAssignableFrom(pd.getClass());
});
}
boolean test(Object pd) {
return this.predicate.test(pd);
}
Map<String, Object> getParams(String sql, Object value) {
return paramValue.getParams(value, sql);
}
public static class MapperPluginsBuilder {
Predicate<Object> predicate;
public MapperPluginsBuilder(Predicate<Object> predicate) {
this.predicate = predicate;
}
public SqlMapperPlugin columnValue(SqlMapperPlugin.ParamValue paramValue) {
return new SqlMapperPlugin(this.predicate, paramValue);
}
}
@FunctionalInterface
public interface ParamValue {
Map<String, Object> getParams(Object var1, String var2);
}
}
public static String getEnumValue(Object value) {
Method method;
try {
method = value.getClass()
.getMethod("name");
return String.valueOf(method.invoke(value));
} catch (NoSuchMethodException e) {
throw new RuntimeException("NoSuchMethodException", e);
} catch (IllegalAccessException e) {
throw new RuntimeException("IllegalAccessException", e);
} catch (InvocationTargetException e) {
throw new RuntimeException("InvocationTargetException", e);
}
}
public interface Order {
Where desc();
Where asc();
}
public interface Where {
Where ifPresent(Object value, String sql);
Order orderBy(String field);
Where limit(int begin, int end);
Where in(List<Object> values, String sql);
String sql();
Map<String, Object> params();
}
}