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Merge pull request #289 from datastax/feature/transform-fields
Feature/transform fields
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153 changes: 153 additions & 0 deletions
153
src/main/java/com/datastax/cdm/feature/ExtractJson.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| /* | ||
| * Copyright DataStax, Inc. | ||
| * | ||
| * Licensed 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 com.datastax.cdm.feature; | ||
|
|
||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
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| import org.apache.commons.lang3.StringUtils; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| import com.datastax.cdm.properties.IPropertyHelper; | ||
| import com.datastax.cdm.properties.KnownProperties; | ||
| import com.datastax.cdm.schema.CqlTable; | ||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.JsonMappingException; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
|
|
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| public class ExtractJson extends AbstractFeature { | ||
| public Logger logger = LoggerFactory.getLogger(this.getClass().getName()); | ||
| private ObjectMapper mapper = new ObjectMapper(); | ||
|
|
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| private String originColumnName = ""; | ||
| private String originJsonFieldName = ""; | ||
| private Integer originColumnIndex = -1; | ||
|
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| private String targetColumnName = ""; | ||
| private Integer targetColumnIndex = -1; | ||
|
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| @Override | ||
| public boolean loadProperties(IPropertyHelper helper) { | ||
| if (null == helper) { | ||
| throw new IllegalArgumentException("helper is null"); | ||
| } | ||
|
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| originColumnName = getColumnName(helper, KnownProperties.EXTRACT_JSON_ORIGIN_COLUMN_NAME); | ||
| targetColumnName = getColumnName(helper, KnownProperties.EXTRACT_JSON_TARGET_COLUMN_MAPPING); | ||
| // Convert columnToFieldMapping to targetColumnName and originJsonFieldName | ||
| if (!targetColumnName.isBlank()) { | ||
| String[] parts = targetColumnName.split("\\:"); | ||
| if (parts.length == 2) { | ||
| originJsonFieldName = parts[0]; | ||
| targetColumnName = parts[1]; | ||
| } else { | ||
| originJsonFieldName = targetColumnName; | ||
| } | ||
| } | ||
|
|
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| isValid = validateProperties(); | ||
| isEnabled = isValid && !originColumnName.isEmpty() && !targetColumnName.isEmpty(); | ||
| isLoaded = true; | ||
|
|
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| return isLoaded && isValid; | ||
| } | ||
|
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| @Override | ||
| protected boolean validateProperties() { | ||
| if (StringUtils.isBlank(originColumnName) && StringUtils.isBlank(targetColumnName)) | ||
| return true; | ||
|
|
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| if (StringUtils.isBlank(originColumnName)) { | ||
| logger.error("Origin column name is not set when Target ({}) is set", targetColumnName); | ||
| return false; | ||
| } | ||
|
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| if (StringUtils.isBlank(targetColumnName)) { | ||
| logger.error("Target column name is not set when Origin ({}) is set", originColumnName); | ||
| return false; | ||
| } | ||
|
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| return true; | ||
| } | ||
|
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| @Override | ||
| public boolean initializeAndValidate(CqlTable originTable, CqlTable targetTable) { | ||
| if (null == originTable || null == targetTable) { | ||
| throw new IllegalArgumentException("Origin table and/or Target table is null"); | ||
| } | ||
| if (!originTable.isOrigin()) { | ||
| throw new IllegalArgumentException(originTable.getKeyspaceTable() + " is not an origin table"); | ||
| } | ||
| if (targetTable.isOrigin()) { | ||
| throw new IllegalArgumentException(targetTable.getKeyspaceTable() + " is not a target table"); | ||
| } | ||
|
|
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| if (!validateProperties()) { | ||
| isEnabled = false; | ||
| return false; | ||
| } | ||
| if (!isEnabled) | ||
| return true; | ||
|
|
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| // Initialize Origin variables | ||
| List<Class> originBindClasses = originTable.extendColumns(Collections.singletonList(originColumnName)); | ||
| if (null == originBindClasses || originBindClasses.size() != 1 || null == originBindClasses.get(0)) { | ||
| throw new IllegalArgumentException("Origin column " + originColumnName | ||
| + " is not found on the origin table " + originTable.getKeyspaceTable()); | ||
| } else { | ||
| this.originColumnIndex = originTable.indexOf(originColumnName); | ||
| } | ||
|
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| // Initialize Target variables | ||
| List<Class> targetBindClasses = targetTable.extendColumns(Collections.singletonList(targetColumnName)); | ||
| if (null == targetBindClasses || targetBindClasses.size() != 1 || null == targetBindClasses.get(0)) { | ||
| throw new IllegalArgumentException("Target column " + targetColumnName | ||
| + " is not found on the target table " + targetTable.getKeyspaceTable()); | ||
| } else { | ||
| this.targetColumnIndex = targetTable.indexOf(targetColumnName); | ||
| } | ||
|
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| logger.info("Feature {} is {}", this.getClass().getSimpleName(), isEnabled ? "enabled" : "disabled"); | ||
| return true; | ||
| } | ||
|
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| public Object extract(String jsonString) throws JsonMappingException, JsonProcessingException { | ||
| if (StringUtils.isNotBlank(jsonString)) { | ||
| return mapper.readValue(jsonString, Map.class).get(originJsonFieldName); | ||
| } | ||
|
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| return null; | ||
| } | ||
|
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| public Integer getOriginColumnIndex() { | ||
| return isEnabled ? originColumnIndex : -1; | ||
| } | ||
|
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| public Integer getTargetColumnIndex() { | ||
| return isEnabled ? targetColumnIndex : -1; | ||
| } | ||
|
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| public String getTargetColumnName() { | ||
| return isEnabled ? targetColumnName : ""; | ||
| } | ||
|
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| private String getColumnName(IPropertyHelper helper, String colName) { | ||
| String columnName = CqlTable.unFormatName(helper.getString(colName)); | ||
| return (null == columnName) ? "" : columnName; | ||
| } | ||
| } |
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