Add remove method to NamedList

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@687489 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/solr/common/util/NamedList.java

@@ -117,6 +117,16 @@ public class NamedList<T> implements Cloneable, Serializable, Iterable<Map.Entry
     return old;
   }
 
+  /**
+   * Removes the name/value pair at the specified index.
+   * @return the value at the index removed
+   */
+  public T remove(int idx) {
+    int index = (idx<<1);
+    nvPairs.remove(index);
+    return (T)nvPairs.remove(index);  // same index, as things shifted in previous remove
+  }
+
   /**
    * Scans the list sequentially beginning at the specified index and
    * returns the index of the first pair with the specified name.

src/test/org/apache/solr/common/util/NamedListTest.java

@@ -0,0 +1,32 @@
+/**
+ * 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.solr.common.util;
+
+import junit.framework.TestCase;
+
+public class NamedListTest extends TestCase {
+  public void testRemove() {
+    NamedList<String> nl = new NamedList<String>();
+    nl.add("key1", "value1");
+    nl.add("key2", "value2");
+    assertEquals(2, nl.size());
+    String value = nl.remove(0);
+    assertEquals("value1", value);
+    assertEquals(1, nl.size());
+  }
+}