1 files changed, 72 insertions, 0 deletions
diff --git a/core/src/main/java/org/elasticsearch/ingest/processor/AbstractStringProcessor.java b/core/src/main/java/org/elasticsearch/ingest/processor/AbstractStringProcessor.java
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index 0000000000..6ae9f2d352
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+++ b/core/src/main/java/org/elasticsearch/ingest/processor/AbstractStringProcessor.java
@@ -0,0 +1,72 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch 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.elasticsearch.ingest.processor;
+
+import org.elasticsearch.ingest.core.AbstractProcessor;
+import org.elasticsearch.ingest.core.AbstractProcessorFactory;
+import org.elasticsearch.ingest.core.ConfigurationUtils;
+import org.elasticsearch.ingest.core.IngestDocument;
+import org.elasticsearch.ingest.core.Processor;
+
+import java.util.Map;
+
+/**
+ * Base class for processors that manipulate strings and require a single "fields" array config value, which
+ * holds a list of field names in string format.
+ */
+public abstract class AbstractStringProcessor extends AbstractProcessor {
+    private final String field;
+
+    protected AbstractStringProcessor(String tag, String field) {
+        super(tag);
+        this.field = field;
+    }
+
+    public String getField() {
+        return field;
+    }
+
+    @Override
+    public final void execute(IngestDocument document) {
+        String val = document.getFieldValue(field, String.class);
+        if (val == null) {
+            throw new IllegalArgumentException("field [" + field + "] is null, cannot process it.");
+        }
+        document.setFieldValue(field, process(val));
+    }
+
+    protected abstract String process(String value);
+
+    public static abstract class Factory<T extends AbstractStringProcessor> extends AbstractProcessorFactory<T> {
+        protected final String processorType;
+
+        protected Factory(String processorType) {
+            this.processorType = processorType;
+        }
+
+        @Override
+        public T doCreate(String processorTag, Map<String, Object> config) throws Exception {
+            String field = ConfigurationUtils.readStringProperty(processorType, processorTag, config, "field");
+            return newProcessor(processorTag, field);
+        }
+
+        protected abstract T newProcessor(String processorTag, String field);
+    }
+}