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sviolet.thistle.model.common.PollGettingMap Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2018 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.model.common;
import java.util.Map;
/**
* 按顺序从一系列Map中取值, 取到为止
*
* @author S.Violet
*/
public class PollGettingMap {
private Map[] maps;
private String[] keyPrefixes;
private ParseExceptionHandler exceptionHandler;
/**
* 内置数个Map, 按指定顺序轮询获取参数, 第一个优先级最高
* @param leadingMap 第一个Map, 优先级最高
* @param followingMaps 其他的Map
*/
public PollGettingMap(Map leadingMap, Map... followingMaps) {
if (leadingMap == null) {
throw new NullPointerException("leadingMap is null");
}
if (followingMaps != null) {
for (Map map : followingMaps) {
if (map == null) {
throw new NullPointerException("one of followingMaps is null");
}
}
this.maps = new Map[followingMaps.length + 1];
this.keyPrefixes = new String[followingMaps.length + 1];
this.maps[0] = leadingMap;
System.arraycopy(followingMaps, 0, this.maps, 1, followingMaps.length);
} else {
this.maps = new Map[]{leadingMap};
this.keyPrefixes = new String[1];
}
}
public PollGettingMap setExceptionHandler(ParseExceptionHandler exceptionHandler){
this.exceptionHandler = exceptionHandler;
return this;
}
/**
* 给指定Map添加key前缀, 从该Map中取值时, 会加上前缀, 然后再去get (仅在key类型为String时有效)
* @param index map编号
* @param keyPrefix key前缀
*/
public PollGettingMap setKeyPrefix(int index, String keyPrefix) {
if (index < 0 || index >= this.keyPrefixes.length) {
throw new ArrayIndexOutOfBoundsException("index out of bound when you setKeyPrefix, array length:" + keyPrefix.length() + ", your index:" + index);
}
this.keyPrefixes[index] = keyPrefix;
return this;
}
/**
* 按顺序从一系列Map中取值, 取到为止
* @param key key
* @param def 默认值
* @return value
*/
public Object get(Object key, Object def) {
Object value;
for (int i = 0 ; i < maps.length ; i++) {
Object k = key;
if (k instanceof String) {
String keyPrefix;
if ((keyPrefix = this.keyPrefixes[i]) != null) {
k = keyPrefix + k;
}
}
if ((value = maps[i].get(k)) != null) {
return value;
}
}
return def;
}
/**
* 按顺序从一系列Map中取String, 取到为止, 若类型不为String会转换成String返回
* @param key key
* @param def 默认值
* @return value
*/
public String getString(Object key, String def) {
Object value = get(key, def);
if (value == null) {
return null;
}
return String.valueOf(value);
}
/**
* 按顺序从一系列Map中取int, 取到为止, 若类型不为int会转换成int返回, 转换失败抛出异常
* @param key key
* @param def 默认值
* @return value
*/
public int getInt(Object key, int def) {
Object value = get(key, def);
if (value instanceof Integer) {
return (int) value;
}
try {
return Integer.parseInt(String.valueOf(value));
} catch (Exception e) {
handleException(key, value, int.class.getName(), def, e);
return def;
}
}
/**
* 按顺序从一系列Map中取long, 取到为止, 若类型不为long会转换成long返回, 转换失败抛出异常
* @param key key
* @param def 默认值
* @return value
*/
public long getLong(Object key, long def) {
Object value = get(key, def);
if (value instanceof Long) {
return (long) value;
}
try {
return Long.parseLong(String.valueOf(value));
} catch (Exception e) {
handleException(key, value, long.class.getName(), def, e);
return def;
}
}
/**
* 按顺序从一系列Map中取float, 取到为止, 若类型不为float会转换成float返回, 转换失败抛出异常
* @param key key
* @param def 默认值
* @return value
*/
public float getFloat(Object key, float def) {
Object value = get(key, def);
if (value instanceof Float) {
return (float) value;
}
try {
return Float.parseFloat(String.valueOf(value));
} catch (Exception e) {
handleException(key, value, float.class.getName(), def, e);
return def;
}
}
/**
* 按顺序从一系列Map中取double, 取到为止, 若类型不为double会转换成double返回, 转换失败抛出异常
* @param key key
* @param def 默认值
* @return value
*/
public double getDouble(Object key, double def) {
Object value = get(key, def);
if (value instanceof Double) {
return (double) value;
}
try {
return Double.parseDouble(String.valueOf(value));
} catch (Exception e) {
handleException(key, value, double.class.getName(), def, e);
return def;
}
}
private void handleException(Object key, Object value, String toType, Object def, Exception e) throws ParseException {
if (exceptionHandler == null) {
throw new ParseException("Error while parsing " + value + " to " + toType, e);
}
exceptionHandler.onParseException(key, value, toType, def, e);
}
/**
* 当value解析为所需类型失败时抛出的异常
*/
public static class ParseException extends RuntimeException {
public ParseException(String message) {
super(message);
}
public ParseException(String message, Throwable cause) {
super(message, cause);
}
}
/**
* 当value解析为所需类型失败时的自定义处理逻辑, 可以抛出ParseException异常, 可以抛出其他RuntimeException, 可以打印日志后返回默认值,
* 也可以不处理(返回默认值)
*/
public interface ParseExceptionHandler {
/**
* 当value解析为所需类型失败时的自定义处理逻辑, 可以抛出ParseException异常, 可以抛出其他RuntimeException, 可以打印日志后返回默认值,
* 也可以不处理(返回默认值). 只要不在onParseException方法中抛出异常, 就会返回默认值.
* @param key key
* @param value value(就是将它转换为toType时发生了异常)
* @param toType 应该返回的类型
* @param def 如果不抛出异常, 会返回该默认值
* @param e 异常
*/
void onParseException(Object key, Object value, String toType, Object def, Exception e) throws ParseException;
}
}
