Add index entry parsers

src/main/java/edu/jhuapl/tinkerpop/parser/EdgeIndexParser.java

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+/* Copyright 2014 The Johns Hopkins University Applied Physics Laboratory
+ *
+ * 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 edu.jhuapl.tinkerpop.parser;
+
+import edu.jhuapl.tinkerpop.AccumuloEdge;
+import edu.jhuapl.tinkerpop.GlobalInstances;
+
+/**
+ * Edge-specific index parser.
+ */
+public class EdgeIndexParser extends ElementIndexParser<AccumuloEdge> {
+
+  public EdgeIndexParser(GlobalInstances globals) {
+    super(globals);
+  }
+
+  @Override
+  protected AccumuloEdge instantiate(String id) {
+    return new AccumuloEdge(globals, id);
+  }
+}

src/main/java/edu/jhuapl/tinkerpop/parser/ElementIndexParser.java

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+/* Copyright 2014 The Johns Hopkins University Applied Physics Laboratory
+ *
+ * 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 edu.jhuapl.tinkerpop.parser;
+
+import java.util.Iterator;
+import java.util.Map.Entry;
+
+import org.apache.accumulo.core.data.Key;
+import org.apache.accumulo.core.data.Value;
+
+import edu.jhuapl.tinkerpop.AccumuloByteSerializer;
+import edu.jhuapl.tinkerpop.AccumuloElement;
+import edu.jhuapl.tinkerpop.AccumuloGraphException;
+import edu.jhuapl.tinkerpop.GlobalInstances;
+
+/**
+ * Parser for elements based on an index table.
+ */
+public abstract class ElementIndexParser<T extends AccumuloElement>
+    implements EntryParser<T> {
+
+  protected final GlobalInstances globals;
+
+  public ElementIndexParser(GlobalInstances globals) {
+    this.globals = globals;
+  }
+
+  @Override
+  public T parse(Iterable<Entry<Key, Value>> entries) {
+    Iterator<Entry<Key, Value>> it = entries.iterator();
+
+    if (it.hasNext()) {
+      Entry<Key, Value> entry = it.next();
+
+      if (it.hasNext()) {
+        throw new AccumuloGraphException("Unexpected multiple entries for index table");
+      }
+
+      String id = entry.getKey().getColumnQualifierData().toString();
+      T element = instantiate(id);
+
+      // While we're here, read the property key/value.
+      String key = entry.getKey().getColumnFamily().toString();
+      Object value = AccumuloByteSerializer.deserialize(entry.getKey().getRow().getBytes());
+      element.setPropertyInMemory(key, value);
+
+      return element;
+    }
+    else {
+      throw new AccumuloGraphException("No index table entries found");
+    }
+  }
+  
+  /**
+   * Instantiate an object to be returned.
+   * @param id
+   * @return
+   */
+  protected abstract T instantiate(String id);
+}

src/main/java/edu/jhuapl/tinkerpop/parser/VertexIndexParser.java

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+/* Copyright 2014 The Johns Hopkins University Applied Physics Laboratory
+ *
+ * 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 edu.jhuapl.tinkerpop.parser;
+
+import edu.jhuapl.tinkerpop.AccumuloVertex;
+import edu.jhuapl.tinkerpop.GlobalInstances;
+
+/**
+ * Vertex-specific index parser.
+ */
+public class VertexIndexParser extends ElementIndexParser<AccumuloVertex> {
+
+  public VertexIndexParser(GlobalInstances globals) {
+    super(globals);
+  }
+
+  @Override
+  protected AccumuloVertex instantiate(String id) {
+    return new AccumuloVertex(globals, id);
+  }
+}