com.github.gkutiel.flip.web.ParseParamService Maven / Gradle / Ivy

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package com.github.gkutiel.flip.web;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class ParseParamService {
	interface RequestParamParser {
		public T from(String[] strs);
	}

	private static final Map, RequestParamParser> REQUEST_PARAMS_PARSERS = new HashMap, RequestParamParser>();
	static {
		REQUEST_PARAMS_PARSERS.put(String.class, new RequestParamParser() {

			@Override
			public String from(final String[] strs) {
				return strs[0];
			}

		});
		final RequestParamParser intValue = new RequestParamParser() {
			@Override
			public Integer from(final String[] strs) {
				return Integer.valueOf(strs[0]);
			}
		};
		REQUEST_PARAMS_PARSERS.put(int.class, intValue);
		REQUEST_PARAMS_PARSERS.put(Integer.class, intValue);
		final RequestParamParser longValue = new RequestParamParser() {
			@Override
			public Long from(final String[] strs) {
				return Long.valueOf(strs[0]);
			}
		};
		REQUEST_PARAMS_PARSERS.put(long.class, longValue);
		REQUEST_PARAMS_PARSERS.put(Long.class, longValue);
		final RequestParamParser doubleValue = new RequestParamParser() {
			@Override
			public Double from(final String[] strs) {
				return Double.valueOf(strs[0]);
			}
		};
		REQUEST_PARAMS_PARSERS.put(double.class, doubleValue);
		REQUEST_PARAMS_PARSERS.put(Double.class, doubleValue);
		final RequestParamParser boolValue = new RequestParamParser() {
			@Override
			public Boolean from(final String[] strs) {
				return Boolean.valueOf(strs[0]);
			}
		};
		REQUEST_PARAMS_PARSERS.put(boolean.class, boolValue);
		REQUEST_PARAMS_PARSERS.put(Boolean.class, boolValue);
		REQUEST_PARAMS_PARSERS.put(List.class, new RequestParamParser>() {
			@Override
			public List from(final String[] strs) {
				return Arrays.asList(strs);
			}
		});
	}

	@SuppressWarnings("unchecked")
	static  T parse(final Class type, final String value) {
		if (value == null) return null;
		return (T) parse(type, new String[] { value });
	}

	@SuppressWarnings("unchecked")
	static  T parse(final Class type, final String[] value) {
		if (value == null) return null;
		return (T) REQUEST_PARAMS_PARSERS.get(type).from(value);
	}
}