move the last of the impls out of core api

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/branches/jackcess-2@684 f203690c-595d-4dc9-a70b-905162fa7fd2

9 files changed, 354 insertions, 236 deletions

diff --git a/src/java/com/healthmarketscience/jackcess/Column.java b/src/java/com/healthmarketscience/jackcess/Column.java
index 7c90a78..82268e5 100644
--- a/src/java/com/healthmarketscience/jackcess/Column.java
+++ b/src/java/com/healthmarketscience/jackcess/Column.java
@@ -27,6 +27,7 @@ import com.healthmarketscience.jackcess.complex.ComplexColumnInfo;
 import com.healthmarketscience.jackcess.complex.ComplexValue;
 
 /**
+ * Access database column definition
  *
  * @author James Ahlborn
  */
diff --git a/src/java/com/healthmarketscience/jackcess/PropertyMap.java b/src/java/com/healthmarketscience/jackcess/PropertyMap.java
index 667a187..5faa3d8 100644
--- a/src/java/com/healthmarketscience/jackcess/PropertyMap.java
+++ b/src/java/com/healthmarketscience/jackcess/PropertyMap.java
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2011 James Ahlborn
+Copyright (c) 2013 James Ahlborn
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
@@ -19,20 +19,12 @@ USA
 
 package com.healthmarketscience.jackcess;
 
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-import com.healthmarketscience.jackcess.impl.DatabaseImpl;
-import com.healthmarketscience.jackcess.impl.PropertyMaps;
-import com.healthmarketscience.jackcess.impl.ByteUtil;
-
 /**
- * Map of properties for a given database object.
+ * Map of properties for a database object.
  *
  * @author James Ahlborn
  */
-public class PropertyMap implements Iterable<PropertyMap.Property>
+public interface PropertyMap extends Iterable<PropertyMap.Property>
 {
   public static final String ACCESS_VERSION_PROP = "AccessVersion";
   public static final String TITLE_PROP = "Title";
@@ -51,124 +43,40 @@ public class PropertyMap implements Iterable<PropertyMap.Property>
   public static final String GUID_PROP = "GUID";
   public static final String DESCRIPTION_PROP = "Description";
 
-  private final String _mapName;
-  private final short _mapType;
-  private final Map<String,Property> _props = 
-    new LinkedHashMap<String,Property>();
-
-  public PropertyMap(String name, short type) {
-    _mapName = name;
-    _mapType = type;
-  }
-
-  public String getName() {
-    return _mapName;
-  }
 
-  public short getType() {
-    return _mapType;
-  }
+  public String getName();
 
-  public int getSize() {
-    return _props.size();
-  }
+  public int getSize();
 
-  public boolean isEmpty() {
-    return _props.isEmpty();
-  }
+  public boolean isEmpty();
 
   /**
    * @return the property with the given name, if any
    */
-  public Property get(String name) {
-    return _props.get(DatabaseImpl.toLookupName(name));
-  }
+  public Property get(String name);
 
   /**
    * @return the value of the property with the given name, if any
    */
-  public Object getValue(String name) {
-    return getValue(name, null);
-  }
+  public Object getValue(String name);
 
   /**
    * @return the value of the property with the given name, if any, otherwise
    *         the given defaultValue
    */
-  public Object getValue(String name, Object defaultValue) {
-    Property prop = get(name);
-    Object value = defaultValue;
-    if((prop != null) && (prop.getValue() != null)) {
-      value = prop.getValue();
-    }
-    return value;
-  }
-
-  /**
-   * Puts a property into this map with the given information.
-   */
-  public void put(String name, DataType type, byte flag, Object value) {
-    _props.put(DatabaseImpl.toLookupName(name), 
-               new Property(name, type, flag, value));
-  }
-
-  public Iterator<Property> iterator() {
-    return _props.values().iterator();
-  }
-
-  @Override
-  public String toString() {
-    StringBuilder sb = new StringBuilder();
-    sb.append(PropertyMaps.DEFAULT_NAME.equals(getName()) ?
-              "<DEFAULT>" : getName())
-      .append(" {");
-    for(Iterator<Property> iter = iterator(); iter.hasNext(); ) {
-      sb.append(iter.next());
-      if(iter.hasNext()) {
-        sb.append(",");
-      }
-    }
-    sb.append("}");
-    return sb.toString();
-  }      
+  public Object getValue(String name, Object defaultValue);
 
   /**
    * Info about a property defined in a PropertyMap.
    */ 
-  public static final class Property
+  public interface Property 
   {
-    private final String _name;
-    private final DataType _type;
-    private final byte _flag;
-    private final Object _value;
-
-    private Property(String name, DataType type, byte flag, Object value) {
-      _name = name;
-      _type = type;
-      _flag = flag;
-      _value = value;
-    }
-
-    public String getName() {
-      return _name;
-    }
-
-    public DataType getType() {
-      return _type;
-    }
-
-    public Object getValue() {
-      return _value;
-    }
-
-    @Override
-    public String toString() {
-      Object val = getValue();
-      if(val instanceof byte[]) {
-        val = ByteUtil.toHexString((byte[])val);
-      }
-      return getName() + "[" + getType() + ":" + _flag + "]=" + val;
-    }
-  }
 
+    public String getName();
+
+    public DataType getType();
+
+    public Object getValue();
+    
+  }
 }
diff --git a/src/java/com/healthmarketscience/jackcess/Relationship.java b/src/java/com/healthmarketscience/jackcess/Relationship.java
index 66ff0a2..2adb7cb 100644
--- a/src/java/com/healthmarketscience/jackcess/Relationship.java
+++ b/src/java/com/healthmarketscience/jackcess/Relationship.java
@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2008 Health Market Science, Inc.
+Copyright (c) 2013 James Ahlborn
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
@@ -15,133 +15,38 @@ You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 USA
-
-You can contact Health Market Science at info@healthmarketscience.com
-or at the following address:
-
-Health Market Science
-2700 Horizon Drive
-Suite 200
-King of Prussia, PA 19406
 */
 
 package com.healthmarketscience.jackcess;
 
-import java.util.Collections;
 import java.util.List;
-import java.util.ArrayList;
 
 /**
  * Information about a relationship between two tables in the database.
  *
  * @author James Ahlborn
  */
-public class Relationship {
-
-  /** flag indicating one-to-one relationship */
-  private static final int ONE_TO_ONE_FLAG =               0x00000001;
-  /** flag indicating no referential integrity */
-  private static final int NO_REFERENTIAL_INTEGRITY_FLAG = 0x00000002;
-  /** flag indicating cascading updates (requires referential integrity) */
-  private static final int CASCADE_UPDATES_FLAG =          0x00000100;
-  /** flag indicating cascading deletes (requires referential integrity) */
-  private static final int CASCADE_DELETES_FLAG =          0x00001000;
-  /** flag indicating left outer join */
-  private static final int LEFT_OUTER_JOIN_FLAG =          0x01000000;
-  /** flag indicating right outer join */
-  private static final int RIGHT_OUTER_JOIN_FLAG =         0x02000000;
-
-  /** the name of this relationship */
-  private final String _name;
-  /** the "from" table in this relationship */
-  private final Table _fromTable;
-  /** the "to" table in this relationship */
-  private final Table _toTable;
-  /** the columns in the "from" table in this relationship (aligned w/
-      toColumns list) */
-  private final List<Column> _toColumns;
-  /** the columns in the "to" table in this relationship (aligned w/
-      toColumns list) */
-  private final List<Column> _fromColumns;
-  /** the various flags describing this relationship */
-  private final int _flags;
-
-  public Relationship(String name, Table fromTable, Table toTable, int flags,
-                      int numCols)
-  {
-    _name = name;
-    _fromTable = fromTable;
-    _fromColumns = new ArrayList<Column>(
-        Collections.nCopies(numCols, (Column)null));
-    _toTable = toTable;
-    _toColumns = new ArrayList<Column>(
-        Collections.nCopies(numCols, (Column)null));
-    _flags = flags;
-  }
-
-  public String getName() {
-    return _name;
-  }
+public interface Relationship 
+{
+  public String getName();
   
-  public Table getFromTable() {
-    return _fromTable;
-  }
-
-  public List<Column> getFromColumns() {
-    return _fromColumns;
-  }
+  public Table getFromTable();
 
-  public Table getToTable() {
-    return _toTable;
-  }
+  public List<Column> getFromColumns();
 
-  public List<Column> getToColumns() {
-    return _toColumns;
-  }
+  public Table getToTable();
 
-  public int getFlags() {
-    return _flags;
-  }
+  public List<Column> getToColumns();
 
-  public boolean isOneToOne() {
-    return hasFlag(ONE_TO_ONE_FLAG);
-  }
+  public boolean isOneToOne();
 
-  public boolean hasReferentialIntegrity() {
-    return !hasFlag(NO_REFERENTIAL_INTEGRITY_FLAG);
-  }
+  public boolean hasReferentialIntegrity();
 
-  public boolean cascadeUpdates() {
-    return hasFlag(CASCADE_UPDATES_FLAG);
-  }
+  public boolean cascadeUpdates();
   
-  public boolean cascadeDeletes() {
-    return hasFlag(CASCADE_DELETES_FLAG);
-  }
+  public boolean cascadeDeletes();
 
-  public boolean isLeftOuterJoin() {
-    return hasFlag(LEFT_OUTER_JOIN_FLAG);
-  }
+  public boolean isLeftOuterJoin();
 
-  public boolean isRightOuterJoin() {
-    return hasFlag(RIGHT_OUTER_JOIN_FLAG);
-  }
-  
-  private boolean hasFlag(int flagMask) {
-    return((getFlags() & flagMask) != 0);
-  }
-
-  @Override
-  public String toString() {
-    StringBuilder rtn = new StringBuilder();
-    rtn.append("\tName: " + _name);
-    rtn.append("\n\tFromTable: " + _fromTable.getName());
-    rtn.append("\n\tFromColumns: " + _fromColumns);
-    rtn.append("\n\tToTable: " + _toTable.getName());
-    rtn.append("\n\tToColumns: " + _toColumns);
-    rtn.append("\n\tFlags: " + Integer.toHexString(_flags));
-    rtn.append("\n\n");
-    return rtn.toString();
-  }
-  
+  public boolean isRightOuterJoin();
 }
diff --git a/src/java/com/healthmarketscience/jackcess/RowId.java b/src/java/com/healthmarketscience/jackcess/RowId.java
index b5b20f6..52af7ed 100644
--- a/src/java/com/healthmarketscience/jackcess/RowId.java
+++ b/src/java/com/healthmarketscience/jackcess/RowId.java
@@ -20,7 +20,10 @@ USA
 package com.healthmarketscience.jackcess;
 
 /**
- * Uniquely identifies a row of data within the access database.
+ * Uniquely identifies a row of data within the access database.  While RowIds
+ * are largely opaque identifiers, they are comparable to each other (within
+ * the same table) and have valid {@link #equals}, {@link #hashCode} and
+ * {@link #toString} methods.
  *
  * @author James Ahlborn
  */
diff --git a/src/java/com/healthmarketscience/jackcess/Table.java b/src/java/com/healthmarketscience/jackcess/Table.java
index 62403bf..d398972 100644
--- a/src/java/com/healthmarketscience/jackcess/Table.java
+++ b/src/java/com/healthmarketscience/jackcess/Table.java
@@ -26,6 +26,9 @@ import java.util.Map;
 import com.healthmarketscience.jackcess.util.ErrorHandler;
 
 /**
+ * A single database table
+ * <p>
+ * Is not thread-safe.
  *
  * @author James Ahlborn
  * @usage _general_class_
diff --git a/src/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java b/src/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
index fcdd86c..75cd01d 100644
--- a/src/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
+++ b/src/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java
@@ -1250,8 +1250,8 @@ public class DatabaseImpl implements Database
           // new relationship
           int numCols = (Integer)row.get(REL_COL_COLUMN_COUNT);
           int flags = (Integer)row.get(REL_COL_FLAGS);
-          rel = new Relationship(relName, fromTable, toTable,
-                                 flags, numCols);
+          rel = new RelationshipImpl(relName, fromTable, toTable,
+                                     flags, numCols);
           relationships.add(rel);
         }
 
diff --git a/src/java/com/healthmarketscience/jackcess/impl/PropertyMapImpl.java b/src/java/com/healthmarketscience/jackcess/impl/PropertyMapImpl.java
new file mode 100644
index 0000000..e267c9b
--- /dev/null
+++ b/src/java/com/healthmarketscience/jackcess/impl/PropertyMapImpl.java
@@ -0,0 +1,146 @@
+/*
+Copyright (c) 2011 James Ahlborn
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+USA
+*/
+
+package com.healthmarketscience.jackcess.impl;
+
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.healthmarketscience.jackcess.DataType;
+import com.healthmarketscience.jackcess.PropertyMap;
+
+/**
+ * Map of properties for a database object.
+ *
+ * @author James Ahlborn
+ */
+public class PropertyMapImpl implements PropertyMap
+{
+  private final String _mapName;
+  private final short _mapType;
+  private final Map<String,Property> _props = 
+    new LinkedHashMap<String,Property>();
+
+  public PropertyMapImpl(String name, short type) {
+    _mapName = name;
+    _mapType = type;
+  }
+
+  public String getName() {
+    return _mapName;
+  }
+
+  public short getType() {
+    return _mapType;
+  }
+
+  public int getSize() {
+    return _props.size();
+  }
+
+  public boolean isEmpty() {
+    return _props.isEmpty();
+  }
+
+  public Property get(String name) {
+    return _props.get(DatabaseImpl.toLookupName(name));
+  }
+
+  public Object getValue(String name) {
+    return getValue(name, null);
+  }
+
+  public Object getValue(String name, Object defaultValue) {
+    Property prop = get(name);
+    Object value = defaultValue;
+    if((prop != null) && (prop.getValue() != null)) {
+      value = prop.getValue();
+    }
+    return value;
+  }
+
+  /**
+   * Puts a property into this map with the given information.
+   */
+  public void put(String name, DataType type, byte flag, Object value) {
+    _props.put(DatabaseImpl.toLookupName(name), 
+               new PropertyImpl(name, type, flag, value));
+  }
+
+  public Iterator<Property> iterator() {
+    return _props.values().iterator();
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append(PropertyMaps.DEFAULT_NAME.equals(getName()) ?
+              "<DEFAULT>" : getName())
+      .append(" {");
+    for(Iterator<Property> iter = iterator(); iter.hasNext(); ) {
+      sb.append(iter.next());
+      if(iter.hasNext()) {
+        sb.append(",");
+      }
+    }
+    sb.append("}");
+    return sb.toString();
+  }      
+
+  /**
+   * Info about a property defined in a PropertyMap.
+   */ 
+  private static final class PropertyImpl implements PropertyMap.Property
+  {
+    private final String _name;
+    private final DataType _type;
+    private final byte _flag;
+    private final Object _value;
+
+    private PropertyImpl(String name, DataType type, byte flag, Object value) {
+      _name = name;
+      _type = type;
+      _flag = flag;
+      _value = value;
+    }
+
+    public String getName() {
+      return _name;
+    }
+
+    public DataType getType() {
+      return _type;
+    }
+
+    public Object getValue() {
+      return _value;
+    }
+
+    @Override
+    public String toString() {
+      Object val = getValue();
+      if(val instanceof byte[]) {
+        val = ByteUtil.toHexString((byte[])val);
+      }
+      return getName() + "[" + getType() + ":" + _flag + "]=" + val;
+    }
+  }
+
+}
diff --git a/src/java/com/healthmarketscience/jackcess/impl/PropertyMaps.java b/src/java/com/healthmarketscience/jackcess/impl/PropertyMaps.java
index 170eeba..41468aa 100644
--- a/src/java/com/healthmarketscience/jackcess/impl/PropertyMaps.java
+++ b/src/java/com/healthmarketscience/jackcess/impl/PropertyMaps.java
@@ -36,7 +36,7 @@ import com.healthmarketscience.jackcess.DataType;
  *
  * @author James Ahlborn
  */
-public class PropertyMaps implements Iterable<PropertyMap>
+public class PropertyMaps implements Iterable<PropertyMapImpl>
 {
   /** the name of the "default" properties for a PropertyMaps instance */
   public static final String DEFAULT_NAME = "";
@@ -47,8 +47,8 @@ public class PropertyMaps implements Iterable<PropertyMap>
 
   /** maps the PropertyMap name (case-insensitive) to the PropertyMap
       instance */
-  private final Map<String,PropertyMap> _maps = 
-    new LinkedHashMap<String,PropertyMap>();
+  private final Map<String,PropertyMapImpl> _maps = 
+    new LinkedHashMap<String,PropertyMapImpl>();
   private final int _objectId;
 
   public PropertyMaps(int objectId) {
@@ -71,7 +71,7 @@ public class PropertyMaps implements Iterable<PropertyMap>
    * @return the unnamed "default" PropertyMap in this group, creating if
    *         necessary.
    */
-  public PropertyMap getDefault() {
+  public PropertyMapImpl getDefault() {
     return get(DEFAULT_NAME, DEFAULT_PROPERTY_VALUE_LIST);
   }
 
@@ -79,7 +79,7 @@ public class PropertyMaps implements Iterable<PropertyMap>
    * @return the PropertyMap with the given name in this group, creating if
    *         necessary
    */
-  public PropertyMap get(String name) {
+  public PropertyMapImpl get(String name) {
     return get(name, COLUMN_PROPERTY_VALUE_LIST);
   }
 
@@ -87,11 +87,11 @@ public class PropertyMaps implements Iterable<PropertyMap>
    * @return the PropertyMap with the given name and type in this group,
    *         creating if necessary
    */
-  private PropertyMap get(String name, short type) {
+  private PropertyMapImpl get(String name, short type) {
     String lookupName = DatabaseImpl.toLookupName(name);
-    PropertyMap map = _maps.get(lookupName);
+    PropertyMapImpl map = _maps.get(lookupName);
     if(map == null) {
-      map = new PropertyMap(name, type);
+      map = new PropertyMapImpl(name, type);
       _maps.put(lookupName, map);
     }
     return map;
@@ -100,18 +100,18 @@ public class PropertyMaps implements Iterable<PropertyMap>
   /**
    * Adds the given PropertyMap to this group.
    */
-  public void put(PropertyMap map) {
+  public void put(PropertyMapImpl map) {
     _maps.put(DatabaseImpl.toLookupName(map.getName()), map);
   }
 
-  public Iterator<PropertyMap> iterator() {
+  public Iterator<PropertyMapImpl> iterator() {
     return _maps.values().iterator();
   }
 
   @Override
   public String toString() {
     StringBuilder sb = new StringBuilder();
-    for(Iterator<PropertyMap> iter = iterator(); iter.hasNext(); ) {
+    for(Iterator<PropertyMapImpl> iter = iterator(); iter.hasNext(); ) {
       sb.append(iter.next());
       if(iter.hasNext()) {
         sb.append("\n");
@@ -207,7 +207,7 @@ public class PropertyMaps implements Iterable<PropertyMap>
      * @return the PropertyMap created from the values parsed from the given
      *         data chunk combined with the given property names
      */
-    private PropertyMap readPropertyValues(
+    private PropertyMapImpl readPropertyValues(
         ByteBuffer bbBlock, List<String> propNames, short blockType) 
       throws IOException
     {
@@ -224,7 +224,7 @@ public class PropertyMaps implements Iterable<PropertyMap>
         bbBlock.position(endPos);
       }
       
-      PropertyMap map = new PropertyMap(mapName, blockType);
+      PropertyMapImpl map = new PropertyMapImpl(mapName, blockType);
 
       // read the values
       while(bbBlock.hasRemaining()) {
@@ -290,8 +290,8 @@ public class PropertyMaps implements Iterable<PropertyMap>
       return col;
     }
 
-    private boolean isPseudoGuidColumn(DataType dataType, String propName, 
-                                       int dataSize) {
+    private static boolean isPseudoGuidColumn(
+        DataType dataType, String propName, int dataSize) {
       // guids seem to be marked as "binary" fields
       return((dataType == DataType.BINARY) && 
              (dataSize == DataType.GUID.getFixedSize()) &&
diff --git a/src/java/com/healthmarketscience/jackcess/impl/RelationshipImpl.java b/src/java/com/healthmarketscience/jackcess/impl/RelationshipImpl.java
new file mode 100644
index 0000000..8424610
--- /dev/null
+++ b/src/java/com/healthmarketscience/jackcess/impl/RelationshipImpl.java
@@ -0,0 +1,152 @@
+/*
+Copyright (c) 2008 Health Market Science, Inc.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+USA
+
+You can contact Health Market Science at info@healthmarketscience.com
+or at the following address:
+
+Health Market Science
+2700 Horizon Drive
+Suite 200
+King of Prussia, PA 19406
+*/
+
+package com.healthmarketscience.jackcess.impl;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.ArrayList;
+
+import com.healthmarketscience.jackcess.Column;
+import com.healthmarketscience.jackcess.Relationship;
+import com.healthmarketscience.jackcess.Table;
+
+/**
+ * Information about a relationship between two tables in the database.
+ *
+ * @author James Ahlborn
+ */
+public class RelationshipImpl implements Relationship
+{
+
+  /** flag indicating one-to-one relationship */
+  private static final int ONE_TO_ONE_FLAG =               0x00000001;
+  /** flag indicating no referential integrity */
+  private static final int NO_REFERENTIAL_INTEGRITY_FLAG = 0x00000002;
+  /** flag indicating cascading updates (requires referential integrity) */
+  private static final int CASCADE_UPDATES_FLAG =          0x00000100;
+  /** flag indicating cascading deletes (requires referential integrity) */
+  private static final int CASCADE_DELETES_FLAG =          0x00001000;
+  /** flag indicating left outer join */
+  private static final int LEFT_OUTER_JOIN_FLAG =          0x01000000;
+  /** flag indicating right outer join */
+  private static final int RIGHT_OUTER_JOIN_FLAG =         0x02000000;
+
+  /** the name of this relationship */
+  private final String _name;
+  /** the "from" table in this relationship */
+  private final Table _fromTable;
+  /** the "to" table in this relationship */
+  private final Table _toTable;
+  /** the columns in the "from" table in this relationship (aligned w/
+      toColumns list) */
+  private final List<Column> _toColumns;
+  /** the columns in the "to" table in this relationship (aligned w/
+      toColumns list) */
+  private final List<Column> _fromColumns;
+  /** the various flags describing this relationship */
+  private final int _flags;
+
+  public RelationshipImpl(String name, Table fromTable, Table toTable, int flags,
+                          int numCols)
+  {
+    _name = name;
+    _fromTable = fromTable;
+    _fromColumns = new ArrayList<Column>(
+        Collections.nCopies(numCols, (Column)null));
+    _toTable = toTable;
+    _toColumns = new ArrayList<Column>(
+        Collections.nCopies(numCols, (Column)null));
+    _flags = flags;
+  }
+
+  public String getName() {
+    return _name;
+  }
+  
+  public Table getFromTable() {
+    return _fromTable;
+  }
+
+  public List<Column> getFromColumns() {
+    return _fromColumns;
+  }
+
+  public Table getToTable() {
+    return _toTable;
+  }
+
+  public List<Column> getToColumns() {
+    return _toColumns;
+  }
+
+  public int getFlags() {
+    return _flags;
+  }
+
+  public boolean isOneToOne() {
+    return hasFlag(ONE_TO_ONE_FLAG);
+  }
+
+  public boolean hasReferentialIntegrity() {
+    return !hasFlag(NO_REFERENTIAL_INTEGRITY_FLAG);
+  }
+
+  public boolean cascadeUpdates() {
+    return hasFlag(CASCADE_UPDATES_FLAG);
+  }
+  
+  public boolean cascadeDeletes() {
+    return hasFlag(CASCADE_DELETES_FLAG);
+  }
+
+  public boolean isLeftOuterJoin() {
+    return hasFlag(LEFT_OUTER_JOIN_FLAG);
+  }
+
+  public boolean isRightOuterJoin() {
+    return hasFlag(RIGHT_OUTER_JOIN_FLAG);
+  }
+  
+  private boolean hasFlag(int flagMask) {
+    return((getFlags() & flagMask) != 0);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder rtn = new StringBuilder();
+    rtn.append("\tName: " + _name);
+    rtn.append("\n\tFromTable: " + _fromTable.getName());
+    rtn.append("\n\tFromColumns: " + _fromColumns);
+    rtn.append("\n\tToTable: " + _toTable.getName());
+    rtn.append("\n\tToColumns: " + _toColumns);
+    rtn.append("\n\tFlags: " + Integer.toHexString(_flags));
+    rtn.append("\n\n");
+    return rtn.toString();
+  }
+  
+}