1 files changed, 74 insertions, 0 deletions
diff --git a/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/field/FieldString.java b/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/field/FieldString.java
new file mode 100644
index 000000000..ddd449380
--- /dev/null
+++ b/org.eclipse.jdt.core/search/org/eclipse/jdt/internal/core/nd/field/FieldString.java
@@ -0,0 +1,74 @@
+/*******************************************************************************
+ * Copyright (c) 2015, 2016 Google, Inc and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Stefan Xenos (Google) - Initial implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.core.nd.field;
+
+import org.eclipse.jdt.internal.core.nd.Nd;
+import org.eclipse.jdt.internal.core.nd.db.Database;
+import org.eclipse.jdt.internal.core.nd.db.EmptyString;
+import org.eclipse.jdt.internal.core.nd.db.IString;
+
+/**
+ * Declares a Nd field of type string. Can be used in place of  {@link Field}&lt{@link String}&gt in order to
+ * avoid extra GC overhead.
+ */
+public class FieldString implements IDestructableField, IField {
+	public static final int RECORD_SIZE = Database.STRING_SIZE;
+	private static final char[] EMPTY_CHAR_ARRAY = new char[0];
+	private int offset;
+
+	public FieldString() {
+	}
+
+	public IString get(Nd nd, long address) {
+		Database db = nd.getDB();
+		long namerec = db.getRecPtr(address + this.offset);
+
+		if (namerec == 0) {
+			return EmptyString.create();
+		}
+		return db.getString(namerec);
+	}
+
+	public void put(Nd nd, long address, char[] newString) {
+		if (newString == null) {
+			newString = EMPTY_CHAR_ARRAY;
+		}
+		final Database db= nd.getDB();
+		IString name= get(nd, address);
+		if (name.compare(newString, true) != 0) {
+			name.delete();
+			if (newString != null && newString.length > 0) {
+				db.putRecPtr(address + this.offset, db.newString(newString).getRecord());
+			} else {
+				db.putRecPtr(address + this.offset, 0);
+			}
+		}
+	}
+
+	public void put(Nd nd, long address, String newString) {
+		put(nd, address, newString.toCharArray());
+	}
+
+	public void destruct(Nd nd, long address) {
+		get(nd, address).delete();
+		nd.getDB().putRecPtr(address + this.offset, 0);
+	}
+
+	@Override
+	public void setOffset(int offset) {
+		this.offset = offset;
+	}
+
+	@Override
+	public int getRecordSize() {
+		return RECORD_SIZE;
+	}
+}