Github user jfrazee commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1312#discussion_r102492802
--- Diff:
nifi-nar-bundles/nifi-ccda-bundle/nifi-ccda-processors/src/main/java/org/apache/nifi/processors/ccda/ExtractCCDAAttributes.java
---
@@ -0,0 +1,383 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.ccda;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Properties;
+import java.util.Set;
+import java.util.TreeMap;
+
+import org.apache.commons.jexl3.JexlBuilder;
+import org.apache.commons.jexl3.JexlContext;
+import org.apache.commons.jexl3.JexlEngine;
+import org.apache.commons.jexl3.JexlExpression;
+import org.apache.commons.jexl3.MapContext;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.flowfile.attributes.CoreAttributes;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.io.OutputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.eclipse.emf.common.util.Diagnostic;
+import org.openhealthtools.mdht.uml.cda.CDAPackage;
+import org.openhealthtools.mdht.uml.cda.ClinicalDocument;
+import org.openhealthtools.mdht.uml.cda.ccd.CCDPackage;
+import org.openhealthtools.mdht.uml.cda.consol.ConsolPackage;
+import org.openhealthtools.mdht.uml.cda.hitsp.HITSPPackage;
+import org.openhealthtools.mdht.uml.cda.ihe.IHEPackage;
+import org.openhealthtools.mdht.uml.cda.util.CDAUtil;
+import org.openhealthtools.mdht.uml.cda.util.CDAUtil.ValidationHandler;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+
+@SideEffectFree
+@SupportsBatching
+@InputRequirement(Requirement.INPUT_REQUIRED)
+@Tags({"CCDA", "healthcare", "extract", "JSON", "attributes"})
+@CapabilityDescription("Extracts information from an Consolidated CDA
formatted FlowFile and provides JSON as FlowFile content "
+ + "and individual attributes as FlowFile attributes. The
attributes are named as <Parent> <dot> <Key>. "
+ + "If the Parent is repeating, the naming will be <Parent>
<underscore> <Parent Index> <dot> <Key>. "
+ + "For example, section.act_07.observation.name=Essential
hypertension")
+public class ExtractCCDAAttributes extends AbstractProcessor {
+
+ private static final String APPLICATION_JSON = "application/json";
+ private static final char FIELD_SEPARATOR = '@';
+ private static final char KEY_VALUE_SEPARATOR = '#';
+
+ private Map<String, Map<String, String>> processMap = new
LinkedHashMap<String, Map<String, String>>(); // stores mapping data for Parser
+ private List<String> timingStats = new ArrayList<String>(); // stores
timing statistics
+ private Map<String, String> attributes = new TreeMap<String,
String>(); // stores CDA attributes
+ private JexlEngine jexl = null; // JEXL Engine to execute code for
mapping
+ private JexlContext jexlCtx = null; // JEXL Context to hold element
being processed
+
+ private List<PropertyDescriptor> properties;
+ private Set<Relationship> relationships;
+
+ /**
+ * SKIP_VALIDATION - Indicates whether to validate the CDA document
after loading.
+ * if true and the document is not valid, then ProcessException will
be thrown
+ */
+ public static final PropertyDescriptor SKIP_VALIDATION = new
PropertyDescriptor.Builder().name("skip-validation")
+ .displayName("Skip Validation").description("Whether or not to
validate CDA message values").required(true)
+ .allowableValues("true",
"false").defaultValue("true").addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .build();
+
+ /**
+ * PRETTY_PRINTING - Choice of whether generated JSON in the FileFlow
content is
+ * pretty printed with new line and tabs or just a continuous string
of characters
+ */
+ public static final PropertyDescriptor PRETTY_PRINTING = new
PropertyDescriptor.Builder().name("pretty-printing")
+ .displayName("Pretty Printing").description("Whether or not to
Pretty Print JSON output").required(true)
+ .allowableValues("true",
"false").defaultValue("false").addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .build();
+
+ /**
+ * REL_SUCCESS - Value to be returned in case the processor succeeds
+ */
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder()
+ .name("success")
+ .description("A FlowFile is routed to this relationship if it
is properly parsed as CDA and its content stored in FlowFile")
+ .build();
+
+ /**
+ * REL_FAILURE - Value to be returned in case the processor fails
+ */
+ public static final Relationship REL_FAILURE = new
Relationship.Builder()
+ .name("failure")
+ .description("A FlowFile is routed to this relationship if it
cannot be parse CDA and store content to FlowFile.")
+ .build();
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return properties;
+ }
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return relationships;
+ }
+
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+ getLogger().info("Loading packages");
+
+ relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+
+ properties = new ArrayList<>();
+ properties.add(SKIP_VALIDATION);
+ properties.add(PRETTY_PRINTING);
+
+ long start = System.currentTimeMillis();
+
+ // Load required MDHT packages
+ System.setProperty(
"org.eclipse.emf.ecore.EPackage.Registry.INSTANCE",
--- End diff --
Setup like this is usually put in a method with the @onScheduled annotation
and init(). See
[ScanAttribute.java](https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ScanAttribute.java#L144)
for an example.
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