LUCENE-1600: don't over-intern String field names

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@764596 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -164,6 +164,9 @@ Bug fixes
     without a collator equal to one with a collator.
     (Mark Platvoet via Mark Miller) 
 
+11. LUCENE-1600: Don't call String.intern unnecessarily in some cases
+    when loading documents from the index.  (P Eger via Mike
+    McCandless)
 
 New features
 

src/java/org/apache/lucene/document/Field.java

@@ -295,6 +295,28 @@ public final class Field extends AbstractField implements Fieldable, Serializabl
    * </ul> 
    */ 
   public Field(String name, String value, Store store, Index index, TermVector termVector) {
+	  this(name, true, value, store, index, termVector);
+  }
+  
+  /**
+   * Create a field by specifying its name, value and how it will
+   * be saved in the index.
+   * 
+   * @param name The name of the field
+   * @param internName Whether to .intern() name or not
+   * @param value The string to process
+   * @param store Whether <code>value</code> should be stored in the index
+   * @param index Whether the field should be indexed, and if so, if it should
+   *  be tokenized before indexing 
+   * @param termVector Whether term vector should be stored
+   * @throws NullPointerException if name or value is <code>null</code>
+   * @throws IllegalArgumentException in any of the following situations:
+   * <ul> 
+   *  <li>the field is neither stored nor indexed</li> 
+   *  <li>the field is not indexed but termVector is <code>TermVector.YES</code></li>
+   * </ul> 
+   */ 
+  public Field(String name, boolean internName, String value, Store store, Index index, TermVector termVector) {
     if (name == null)
       throw new NullPointerException("name cannot be null");
     if (value == null)
@@ -308,7 +330,11 @@ public final class Field extends AbstractField implements Fieldable, Serializabl
       throw new IllegalArgumentException("cannot store term vector information "
          + "for a field that is not indexed");
           
-    this.name = name.intern();        // field names are interned
+    if (internName) // field names are optionally interned
+      name = name.intern();        
+    
+    this.name = name; 
+    
     this.fieldsData = value;
 
     if (store == Store.YES){

src/java/org/apache/lucene/index/FieldInfos.java

@@ -214,8 +214,8 @@ final class FieldInfos {
   private FieldInfo addInternal(String name, boolean isIndexed,
                                 boolean storeTermVector, boolean storePositionWithTermVector, 
                                 boolean storeOffsetWithTermVector, boolean omitNorms, boolean storePayloads, boolean omitTermFreqAndPositions) {
-    FieldInfo fi =
-      new FieldInfo(name, isIndexed, byNumber.size(), storeTermVector, storePositionWithTermVector,
+    name = name.intern();
+    FieldInfo fi = new FieldInfo(name, isIndexed, byNumber.size(), storeTermVector, storePositionWithTermVector,
                                  storeOffsetWithTermVector, omitNorms, storePayloads, omitTermFreqAndPositions);
     byNumber.add(fi);
     byName.put(name, fi);

src/java/org/apache/lucene/index/FieldsReader.java

@@ -380,6 +380,7 @@ final class FieldsReader implements Cloneable {
         final byte[] b = new byte[toRead];
         fieldsStream.readBytes(b, 0, b.length);
         f = new Field(fi.name,      // field name
+                false,
                 new String(uncompress(b), "UTF-8"), // uncompress the value and add as string
                 store,
                 index,
@@ -388,6 +389,7 @@ final class FieldsReader implements Cloneable {
         f.setOmitNorms(fi.omitNorms);
       } else {
         f = new Field(fi.name,     // name
+      		false,
                 fieldsStream.readString(), // read value
                 store,
                 index,