001/* -*- mode: Java; c-basic-offset: 2; indent-tabs-mode: nil; coding: utf-8-unix -*- 002 * 003 * Copyright © 2017 MicroBean. 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 014 * implied. See the License for the specific language governing 015 * permissions and limitations under the License. 016 */ 017package org.microbean.configuration.spi.converter; 018 019import java.util.Arrays; 020import java.util.Collections; 021import java.util.Map; 022 023import java.util.stream.Collectors; 024 025import org.microbean.configuration.api.ConversionException; 026 027import org.microbean.configuration.spi.Converter; 028 029public final class StringToMapStringStringConverter extends Converter<Map<String, String>> { 030 031 private static final long serialVersionUID = 1L; 032 033 @Override 034 public final Map<String, String> convert(String value) { 035 Map<String, String> returnValue = null; 036 if (value != null) { 037 value = value.trim(); 038 if (value.isEmpty()) { 039 returnValue = Collections.emptyMap(); 040 } else if (value.startsWith("{") && value.endsWith("}")) { 041 value = value.substring(1, value.length() - 1).trim(); // chops off the { and the } 042 } 043 if (value.isEmpty()) { 044 returnValue = Collections.emptyMap(); 045 } else { 046 returnValue = Arrays.stream(value.split(",")) 047 .map(String::trim) 048 .filter(s -> !s.isEmpty()) 049 .map(s -> s.split("=")) 050 .collect(Collectors.toMap(a -> a[0].trim(), a -> a[1].trim())); 051 } 052 } 053 return returnValue; 054 } 055 056}