Add support for liquid on csv files

org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/BaseCSVWrapper.java

@@ -0,0 +1,128 @@
+package org.hl7.fhir.r5.utils;
+
+import java.util.List;
+
+import org.hl7.fhir.exceptions.FHIRException;
+import org.hl7.fhir.r5.model.Base;
+import org.hl7.fhir.utilities.FhirPublication;
+import org.hl7.fhir.utilities.Utilities;
+import org.hl7.fhir.utilities.json.model.JsonArray;
+import org.hl7.fhir.utilities.json.model.JsonElement;
+
+// this class exists to allow the Liquid Engine to be used against raw JSON
+
+public class BaseCSVWrapper extends Base {
+
+
+  private static final long serialVersionUID = 1L;
+  private List<String> columns;
+  private List<String> values;
+  private List<List<String>> rows;
+  private String value; 
+
+  private BaseCSVWrapper() {
+    super();
+  }
+  
+  public static BaseCSVWrapper forRows(List<String> columns, List<List<String>> rows) {
+    BaseCSVWrapper self = new BaseCSVWrapper();
+    self.columns = columns;
+    self.rows = rows;
+    return self;
+  }
+
+  public static BaseCSVWrapper forRow(List<String> columns, List<String> values) {
+    BaseCSVWrapper self = new BaseCSVWrapper();
+    self.columns = columns;
+    self.values = values;
+    return self;
+  }
+
+  public static BaseCSVWrapper forCell(String value) {
+    BaseCSVWrapper self = new BaseCSVWrapper();
+    self.value = value;
+    return self;
+  }
+  
+  @Override
+  public String fhirType() {
+    if (values != null || rows != null) {
+      return "Object";
+    } else if (Utilities.existsInList(value, "true", "false")) {
+      return "boolean";
+    } else if (Utilities.isInteger(value)) {
+      return "integer";
+    } else if (Utilities.isDecimal(value, true)) {
+      return "decimal";
+    } else if (Utilities.isAbsoluteUrl(value)) {
+      return "url";
+    } else {
+      return "string";
+    }
+  }
+
+  @Override
+  public String getIdBase() {
+    if (columns == null) {
+      return null;
+    }
+    
+    int i = columns.indexOf("id");
+    if (i > -1) {
+      return values.get(i);
+    } else {
+      return null;
+    }
+  }
+
+  @Override
+  public void setIdBase(String value) {
+    throw new Error("BaseCSVWrapper is read only");
+  }
+
+  @Override
+  public Base copy() {
+    throw new Error("BaseCSVWrapper is read only");
+  }
+
+  @Override
+  public FhirPublication getFHIRPublicationVersion() {
+    return FhirPublication.R5;
+  }
+
+  public Base[] getProperty(int hash, String name, boolean checkValid) throws FHIRException {
+    if (rows != null && "rows".equals(name)) {
+      Base[] l = new Base[rows.size()];
+      for (int i = 0; i < rows.size(); i++) {
+        l[i] = BaseCSVWrapper.forRow(columns, rows.get(i));
+      }
+      return l;      
+    }
+    if (values != null) {
+      int i = columns.indexOf(name);
+      if (i > -1) {
+        Base[] l = new Base[1];
+        l[0] = BaseCSVWrapper.forCell(values.get(i));
+        return l;
+      }
+    } 
+    return super.getProperty(hash, name, checkValid);
+  }
+
+  @Override
+  public String toString() {
+    return value;
+  }
+  
+
+  @Override  
+  public boolean isPrimitive() {
+    return value != null;
+  }
+
+
+  @Override 
+  public String primitiveValue() {
+    return value;
+  }
+}