add method to simplify testing whether or not a Table is linked to a Database, feature #28

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@914 f203690c-595d-4dc9-a70b-905162fa7fd2

2 files changed, 24 insertions, 0 deletions

diff --git a/src/main/java/com/healthmarketscience/jackcess/Database.java b/src/main/java/com/healthmarketscience/jackcess/Database.java
index 24d291d..808dac7 100644
--- a/src/main/java/com/healthmarketscience/jackcess/Database.java
+++ b/src/main/java/com/healthmarketscience/jackcess/Database.java
@@ -329,6 +329,14 @@ public interface Database extends Iterable<Table>, Closeable, Flushable
    */
   public Map<String,Database> getLinkedDatabases();
 
+  
+  /**
+   * Returns {@code true} if this Database links to the given Table, {@code
+   * false} otherwise.
+   * @usage _general_method_
+   */
+  public boolean isLinkedTable(Table table) throws IOException;
+  
   /**
    * Gets currently configured TimeZone (always non-{@code null}).
    * @usage _intermediate_method_
diff --git a/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java b/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
index 2afd394..aa75896 100644
--- a/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
+++ b/src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
@@ -599,6 +599,22 @@ public class DatabaseImpl implements Database
             Collections.unmodifiableMap(_linkedDbs));
   }
 
+  public boolean isLinkedTable(Table table) throws IOException {
+    
+    if((table == null) || (this == table.getDatabase())) {
+      // if the table is null or this db owns the table, not linked
+      return false;
+    }
+
+    TableInfo tableInfo = lookupTable(table.getName());
+    
+    return((tableInfo != null) &&
+           tableInfo.isLinked() &&
+           (_linkedDbs != null) &&
+           (_linkedDbs.get(((LinkedTableInfo)tableInfo).linkedDbName) ==
+            table.getDatabase()));
+  }  
+  
   public TimeZone getTimeZone() {
     return _timeZone;
   }