001package org.hl7.fhir.r4.formats;
002
003/*
004Copyright (c) 2011+, HL7, Inc
005All rights reserved.
006
007Redistribution and use in source and binary forms, with or without modification, 
008are permitted provided that the following conditions are met:
009
010 * Redistributions of source code must retain the above copyright notice, this 
011   list of conditions and the following disclaimer.
012 * Redistributions in binary form must reproduce the above copyright notice, 
013   this list of conditions and the following disclaimer in the documentation 
014   and/or other materials provided with the distribution.
015 * Neither the name of HL7 nor the names of its contributors may be used to 
016   endorse or promote products derived from this software without specific 
017   prior written permission.
018
019THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028POSSIBILITY OF SUCH DAMAGE.
029
030*/
031
032import java.math.BigDecimal;
033import java.net.URI;
034
035import org.apache.commons.codec.binary.Base64;
036import org.hl7.fhir.exceptions.FHIRException;
037import org.hl7.fhir.r4.elementmodel.Manager.FhirFormat;
038
039public abstract class FormatUtilities {
040  public static final String ID_REGEX = "[A-Za-z0-9\\-\\.]{1,64}";
041  public static final String FHIR_NS = "http://hl7.org/fhir";
042  public static final String XHTML_NS = "http://www.w3.org/1999/xhtml";
043  public static final String NS_XSI = "http://www.w3.org/2001/XMLSchema-instance";
044  private static final int MAX_SCAN_LENGTH = 1000; // how many characters to scan into content when autodetermining format
045 
046  protected String toString(String value) {
047    return value;
048  }
049  
050  protected String toString(int value) {
051    return java.lang.Integer.toString(value);
052  }
053  
054  protected String toString(boolean value) {
055    return java.lang.Boolean.toString(value);
056  }
057  
058  protected String toString(BigDecimal value) {
059    return value.toString();
060  }
061  
062  protected String toString(URI value) {
063    return value.toString();
064  }
065
066  public static String toString(byte[] value) {
067    byte[] encodeBase64 = Base64.encodeBase64(value);
068    return new String(encodeBase64);
069  }
070  
071        public static boolean isValidId(String tail) {
072          return tail.matches(ID_REGEX);
073  }
074
075  public static String makeId(String candidate) {
076    StringBuilder b = new StringBuilder();
077    for (char c : candidate.toCharArray())
078      if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '.' || c == '-')
079        b.append(c);
080    return b.toString();
081  }
082
083  public static ParserBase makeParser(FhirFormat format) {
084    switch (format) {
085    case XML : return new XmlParser();
086    case JSON : return new JsonParser();
087    case TURTLE : throw new Error("unsupported Format "+format.toString()); // return new TurtleParser();
088    case VBAR : throw new Error("unsupported Format "+format.toString()); // 
089    case TEXT : throw new Error("unsupported Format "+format.toString()); // 
090    }
091    throw new Error("unsupported Format "+format.toString());
092  }
093  
094  public static ParserBase makeParser(String format) {
095    if ("XML".equalsIgnoreCase(format)) return new XmlParser();
096    if ("JSON".equalsIgnoreCase(format)) return new JsonParser();
097    if ("TURTLE".equalsIgnoreCase(format)) throw new Error("unsupported Format "+format.toString()); // return new TurtleParser();
098    if ("JSONLD".equalsIgnoreCase(format)) throw new Error("unsupported Format "+format.toString()); // return new JsonLdParser();
099    if ("VBAR".equalsIgnoreCase(format)) throw new Error("unsupported Format "+format.toString()); // 
100    if ("TEXT".equalsIgnoreCase(format)) throw new Error("unsupported Format "+format.toString()); // 
101    throw new Error("unsupported Format "+format);
102  }  
103
104  public static FhirFormat determineFormat(byte[] source) throws FHIRException {
105    return determineFormat(source, MAX_SCAN_LENGTH);
106  }
107  
108  public static FhirFormat determineFormat(byte[] source, int scanLength) throws FHIRException {
109    if (scanLength == -1)
110      scanLength = source.length;
111    int lt = firstIndexOf(source, '<', scanLength);
112    int ps = firstIndexOf(source, '{', scanLength);
113    int at = firstIndexOf(source, '@', scanLength);
114    if (at < ps && at < lt) return FhirFormat.TURTLE;
115    if (ps < lt) return FhirFormat.JSON;
116    if (lt < ps) return FhirFormat.XML;
117    throw new FHIRException("unable to determine format");
118  }
119
120  private static int firstIndexOf(byte[] source, char c, int scanLength) {
121    for (int i = 0; i < Math.max(source.length, scanLength); i++) {
122      if (source[i] == c)
123        return i;
124    }
125    return Integer.MAX_VALUE;
126  }
127
128
129}