jpa/plugins/org.eclipse.jpt.db/src/org/eclipse/jpt/db/internal/DTPForeignKeyWrapper.java - dali/webtools.dali - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006, 2009 Oracle. 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:
  *     Oracle - initial API and implementation
  ******************************************************************************/
 package org.eclipse.jpt.db.internal;

 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.Iterator;
 import java.util.List;

 import org.eclipse.jpt.db.Column;
 import org.eclipse.jpt.db.ForeignKey;
 import org.eclipse.jpt.utility.internal.ArrayTools;
 import org.eclipse.jpt.utility.internal.CollectionTools;
 import org.eclipse.jpt.utility.internal.StringTools;
 import org.eclipse.jpt.utility.internal.iterators.ArrayIterator;
 import org.eclipse.jpt.utility.internal.iterators.FilteringIterator;
 import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;

 import com.ibm.icu.text.Collator;

 /**
  *  Wrap a DTP ForeignKey
  */
 final class DTPForeignKeyWrapper
 	extends DTPDatabaseObjectWrapper
 	implements ForeignKey
 {
 	// the wrapped DTP foreign key
 	private final org.eclipse.datatools.modelbase.sql.constraints.ForeignKey dtpForeignKey;

 	// lazy-initialized
 	private DTPTableWrapper referencedTable;

 	// lazy-initialized
 	private LocalColumnPair[] columnPairs;

 	// lazy-initialized - but it can be 'null' so we use a flag
 	private String defaultAttributeName;
 	private boolean defaultAttributeNameCalculated = false;


 	// ********** constructor **********

 	DTPForeignKeyWrapper(DTPTableWrapper baseTable, org.eclipse.datatools.modelbase.sql.constraints.ForeignKey dtpForeignKey) {
 		super(baseTable, dtpForeignKey);
 		this.dtpForeignKey = dtpForeignKey;
 	}


 	// ********** DTPWrapper implementation **********

 	@Override
 	synchronized void catalogObjectChanged() {
 		super.catalogObjectChanged();
 		this.getConnectionProfile().foreignKeyChanged(this);
 	}

 	@Override
 	public String toString() {
 		return StringTools.buildToStringFor(this, this.getName() + ": " + Arrays.asList(this.getColumnPairs()));  //$NON-NLS-1$
 	}


 	// ********** ForeignKey implementation **********

 	public String getName() {
 		return this.dtpForeignKey.getName();
 	}

 	public DTPTableWrapper getBaseTable() {
 		return (DTPTableWrapper) this.getParent();
 	}

 	public synchronized DTPTableWrapper getReferencedTable() {
 		if (this.referencedTable == null) {
 			this.referencedTable = this.getBaseTable().getTable(this.dtpForeignKey.getUniqueConstraint().getBaseTable());
 		}
 		return this.referencedTable;
 	}

 	public boolean referencesSingleColumnPrimaryKey() {
 		if (this.columnPairsSize() != 1) {
 			return false;
 		}
 		if (this.getReferencedTable().primaryKeyColumnsSize() != 1) {
 			return false;
 		}
 		return this.getColumnPair().getReferencedColumn() == this.getReferencedTable().getPrimaryKeyColumn();
 	}

 	// ***** column pairs

 	public Iterator<ColumnPair> columnPairs() {
 		return new ArrayIterator<ColumnPair>(this.getColumnPairs());
 	}

 	public LocalColumnPair getColumnPair() {
 		LocalColumnPair[] pairs = this.getColumnPairs();
 		if (pairs.length != 1) {
 			throw new IllegalStateException("multiple column pairs: " + pairs.length);  //$NON-NLS-1$
 		}
 		return pairs[0];
 	}

 	private Iterator<LocalColumnPair> localColumnPairs() {
 		return new ArrayIterator<LocalColumnPair>(this.getColumnPairs());
 	}

 	private synchronized LocalColumnPair[] getColumnPairs() {
 		if (this.columnPairs == null) {
 			this.columnPairs = this.buildColumnPairs();
 		}
 		return this.columnPairs;
 	}

 	private LocalColumnPair[] buildColumnPairs() {
 		List<org.eclipse.datatools.modelbase.sql.tables.Column> baseColumns = this.getDTPBaseColumns();
 		int size = baseColumns.size();
 		List<org.eclipse.datatools.modelbase.sql.tables.Column> refColumns = this.getDTPReferenceColumns();
 		if (refColumns.size() != size) {
 			throw new IllegalStateException(this.getBaseTable().getName() + '.' + this.getName() +
 								" - mismatched sizes: " + size + " vs. " + refColumns.size());  //$NON-NLS-1$  //$NON-NLS-2$
 		}
 		LocalColumnPair[] result = new LocalColumnPair[baseColumns.size()];
 		for (int i = baseColumns.size(); i-- > 0; ) {
 			result[i] = new LocalColumnPair(
 								this.getBaseTable().getColumn(baseColumns.get(i)),
 								this.getBaseTable().getColumn(refColumns.get(i))
 						);
 		}
 		return ArrayTools.sort(result, this.buildColumnPairComparator());
 	}

 	private Comparator<ColumnPair> buildColumnPairComparator() {
 		return new Comparator<ColumnPair>() {
 			public int compare(ColumnPair columnPair1, ColumnPair columnPair2) {
 				return Collator.getInstance().compare(columnPair1.getBaseColumn().getName(), columnPair2.getBaseColumn().getName());
 			}
 		};
 	}

 	// minimize scope of suppressed warnings
 	@SuppressWarnings("unchecked")
 	private List<org.eclipse.datatools.modelbase.sql.tables.Column> getDTPBaseColumns() {
 		return this.dtpForeignKey.getMembers();
 	}

 	// minimize scope of suppressed warnings
 	@SuppressWarnings("unchecked")
 	private List<org.eclipse.datatools.modelbase.sql.tables.Column> getDTPReferenceColumns() {
 		return this.dtpForeignKey.getUniqueConstraint().getMembers();
 	}

 	public int columnPairsSize() {
 		return this.getColumnPairs().length;
 	}

 	public Iterator<Column> baseColumns() {
 		return new TransformationIterator<LocalColumnPair, Column>(this.localColumnPairs()) {
 			@Override
 			protected Column transform(LocalColumnPair pair) {
 				return pair.getBaseColumn();
 			}
 		};
 	}

 	boolean baseColumnsContains(Column column) {
 		return CollectionTools.contains(this.baseColumns(), column);
 	}

 	public Iterator<Column> nonPrimaryKeyBaseColumns() {
 		return new FilteringIterator<Column, Column>(this.baseColumns()) {
 			@Override
 			protected boolean accept(Column column) {
 				return ! column.isPartOfPrimaryKey();
 			}
 		};
 	}

 	public Iterator<Column> referencedColumns() {
 		return new TransformationIterator<LocalColumnPair, Column>(this.localColumnPairs()) {
 			@Override
 			protected Column transform(LocalColumnPair columnPair) {
 				return columnPair.getReferencedColumn();
 			}
 		};
 	}

 	// ***** attribute name

 	public String getAttributeName() {
 		String defaultName = this.getDefaultAttributeName();
 		return (defaultName != null) ? defaultName : this.getNonDefaultAttributeName();
 	}

 	public synchronized String getDefaultAttributeName() {
 		if ( ! this.defaultAttributeNameCalculated) {
 			this.defaultAttributeNameCalculated = true;
 			this.defaultAttributeName = this.buildDefaultAttributeName();
 		}
 		return this.defaultAttributeName;
 	}

 	private String buildDefaultAttributeName() {
 		if ( ! this.referencesSingleColumnPrimaryKey()) {
 			return null;
 		}
 		LocalColumnPair columnPair = this.getColumnPair();
 		String baseColName = columnPair.getBaseColumn().getName();
 		String refColName = columnPair.getReferencedColumn().getName();
 		if (baseColName.length() <= (refColName.length() + 1)) {
 			return null;
 		}
 		if ( ! baseColName.endsWith(refColName)) {
 			return null;
 		}
 		int _index = baseColName.length() - refColName.length() - 1;
 		if (baseColName.charAt(_index) != '_') {
 			return null;
 		}
 		return baseColName.substring(0, _index);
 	}

 	/**
 	 * If this is a simple (single-column) foreign key, use the name of the
 	 * single base column to build a name. If this is a compound foreign key,
 	 * return the name of the referenced table.
 	 */
 	// TODO if there is only one FK to a given table, use the table's name instead of the column's name?
 	private String getNonDefaultAttributeName() {
 		return (this.columnPairsSize() == 1) ?
 						this.getNonDefaultAttributeNameFromBaseColumn()
 					:
 						this.getReferencedTable().getName();
 	}

 	/**
 	 * The underscore check is helpful when the referenced column is NOT the
 	 * primary key of the referenced table (i.e. it has only a UNIQUE constraint).
 	 *     ForeignKey(EMP.CUBICLE_ID => CUBICLE.ID) => "CUBICLE"
 	 *     ForeignKey(EMP.CUBICLEID => CUBICLE.ID) => "CUBICLE"
 	 *     ForeignKey(EMP.CUBICLE_PK => CUBICLE.ID) => "CUBICLE_PK"
 	 */
 	private String getNonDefaultAttributeNameFromBaseColumn() {
 		LocalColumnPair columnPair = this.getColumnPair();
 		String baseColName = columnPair.getBaseColumn().getName();
 		String refColName = columnPair.getReferencedColumn().getName();
 		int len = baseColName.length();
 		int refLen = refColName.length();
 		if ((len > refLen) && baseColName.endsWith(refColName)) {
 			len = len - refLen;
 			if ((len > 1) && baseColName.charAt(len - 1) == '_') {
 				len = len - 1;
 			}
 		}
 		return baseColName.substring(0, len);
 	}

 	/**
 	 * Examples:
 	 * Oracle etc.
 	 *     ForeignKey(FOO_ID => ID) vs. "foo" => null
 	 *     ForeignKey(FOO_ID => FOO_ID) vs. "foo" => "FOO_ID"
 	 *     ForeignKey(FOO => ID) vs. "foo" => "FOO"
 	 *     ForeignKey(Foo_ID => ID) vs. "foo" => "\"Foo_ID\""
 	 *
 	 * PostgreSQL etc.
 	 *     ForeignKey(foo_id => id) vs. "foo" => null
 	 *     ForeignKey(foo_id => foo_id) vs. "foo" => "foo_id"
 	 *     ForeignKey(foo => id) vs. "foo" => "foo"
 	 *     ForeignKey(Foo_ID => ID) vs. "foo" => "\"Foo_ID\""
 	 *
 	 * SQL Server etc.
 	 *     ForeignKey(foo_ID => ID) vs. "foo" => null
 	 *     ForeignKey(FOO_ID => FOO_ID) vs. "foo" => "FOO_ID"
 	 *     ForeignKey(FOO => ID) vs. "foo" => "FOO"
 	 *     ForeignKey(Foo_ID => ID) vs. "foo" => "Foo_ID"
 	 */
 	public String getJoinColumnAnnotationIdentifier(String attributeName) {
 		String baseColumnName = this.getColumnPair().getBaseColumn().getName();
 		String defaultBaseColumnName = attributeName + '_' + this.getReferencedTable().getPrimaryKeyColumn().getName();
 		return this.getDatabase().convertNameToIdentifier(baseColumnName, defaultBaseColumnName);
 	}


 	// ********** internal methods **********

 	boolean wraps(org.eclipse.datatools.modelbase.sql.constraints.ForeignKey foreignKey) {
 		return this.dtpForeignKey == foreignKey;
 	}

 	@Override
 	synchronized void clear() {
 		// the foreign key does not "contain" any other objects,
 		// so we don't need to forward the #clear()
 		this.defaultAttributeNameCalculated = false;
 		this.defaultAttributeName = null;
 		this.columnPairs =  null;
 		this.referencedTable = null;
 	}


 	// ********** column pair implementation **********

 	static class LocalColumnPair implements ColumnPair {
 		private final DTPColumnWrapper baseColumn;
 		private final DTPColumnWrapper referencedColumn;

 		LocalColumnPair(DTPColumnWrapper baseColumn, DTPColumnWrapper referencedColumn) {
 			super();
 			if ((baseColumn == null) || (referencedColumn == null)) {
 				throw new NullPointerException();
 			}
 			this.baseColumn = baseColumn;
 			this.referencedColumn = referencedColumn;
 		}

 		public DTPColumnWrapper getBaseColumn() {
 			return this.baseColumn;
 		}

 		public DTPColumnWrapper getReferencedColumn() {
 			return this.referencedColumn;
 		}

 		@Override
 		public String toString() {
 			return StringTools.buildToStringFor(this, this.baseColumn.getName() + "=>" + this.referencedColumn.getName());  //$NON-NLS-1$
 		}

 	}

 }
	/*******************************************************************************
	* Copyright (c) 2006, 2009 Oracle. 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:
	* Oracle - initial API and implementation
	******************************************************************************/
	package org.eclipse.jpt.db.internal;

	import java.util.Arrays;
	import java.util.Comparator;
	import java.util.Iterator;
	import java.util.List;

	import org.eclipse.jpt.db.Column;
	import org.eclipse.jpt.db.ForeignKey;
	import org.eclipse.jpt.utility.internal.ArrayTools;
	import org.eclipse.jpt.utility.internal.CollectionTools;
	import org.eclipse.jpt.utility.internal.StringTools;
	import org.eclipse.jpt.utility.internal.iterators.ArrayIterator;
	import org.eclipse.jpt.utility.internal.iterators.FilteringIterator;
	import org.eclipse.jpt.utility.internal.iterators.TransformationIterator;

	import com.ibm.icu.text.Collator;

	/**
	* Wrap a DTP ForeignKey
	*/
	final class DTPForeignKeyWrapper
	extends DTPDatabaseObjectWrapper
	implements ForeignKey
	{
	// the wrapped DTP foreign key
	private final org.eclipse.datatools.modelbase.sql.constraints.ForeignKey dtpForeignKey;

	// lazy-initialized
	private DTPTableWrapper referencedTable;

	// lazy-initialized
	private LocalColumnPair[] columnPairs;

	// lazy-initialized - but it can be 'null' so we use a flag
	private String defaultAttributeName;
	private boolean defaultAttributeNameCalculated = false;


	// ******** constructor ********

	DTPForeignKeyWrapper(DTPTableWrapper baseTable, org.eclipse.datatools.modelbase.sql.constraints.ForeignKey dtpForeignKey) {
	super(baseTable, dtpForeignKey);
	this.dtpForeignKey = dtpForeignKey;
	}


	// ******** DTPWrapper implementation ********

	@Override
	synchronized void catalogObjectChanged() {
	super.catalogObjectChanged();
	this.getConnectionProfile().foreignKeyChanged(this);
	}

	@Override
	public String toString() {
	return StringTools.buildToStringFor(this, this.getName() + ": " + Arrays.asList(this.getColumnPairs())); //$NON-NLS-1$
	}


	// ******** ForeignKey implementation ********

	public String getName() {
	return this.dtpForeignKey.getName();
	}

	public DTPTableWrapper getBaseTable() {
	return (DTPTableWrapper) this.getParent();
	}

	public synchronized DTPTableWrapper getReferencedTable() {
	if (this.referencedTable == null) {
	this.referencedTable = this.getBaseTable().getTable(this.dtpForeignKey.getUniqueConstraint().getBaseTable());
	}
	return this.referencedTable;
	}

	public boolean referencesSingleColumnPrimaryKey() {
	if (this.columnPairsSize() != 1) {
	return false;
	}
	if (this.getReferencedTable().primaryKeyColumnsSize() != 1) {
	return false;
	}
	return this.getColumnPair().getReferencedColumn() == this.getReferencedTable().getPrimaryKeyColumn();
	}

	// ***** column pairs

	public Iterator<ColumnPair> columnPairs() {
	return new ArrayIterator<ColumnPair>(this.getColumnPairs());
	}

	public LocalColumnPair getColumnPair() {
	LocalColumnPair[] pairs = this.getColumnPairs();
	if (pairs.length != 1) {
	throw new IllegalStateException("multiple column pairs: " + pairs.length); //$NON-NLS-1$
	}
	return pairs[0];
	}

	private Iterator<LocalColumnPair> localColumnPairs() {
	return new ArrayIterator<LocalColumnPair>(this.getColumnPairs());
	}

	private synchronized LocalColumnPair[] getColumnPairs() {
	if (this.columnPairs == null) {
	this.columnPairs = this.buildColumnPairs();
	}
	return this.columnPairs;
	}

	private LocalColumnPair[] buildColumnPairs() {
	List<org.eclipse.datatools.modelbase.sql.tables.Column> baseColumns = this.getDTPBaseColumns();
	int size = baseColumns.size();
	List<org.eclipse.datatools.modelbase.sql.tables.Column> refColumns = this.getDTPReferenceColumns();
	if (refColumns.size() != size) {
	throw new IllegalStateException(this.getBaseTable().getName() + '.' + this.getName() +
	" - mismatched sizes: " + size + " vs. " + refColumns.size()); //$NON-NLS-1$ //$NON-NLS-2$
	}
	LocalColumnPair[] result = new LocalColumnPair[baseColumns.size()];
	for (int i = baseColumns.size(); i-- > 0; ) {
	result[i] = new LocalColumnPair(
	this.getBaseTable().getColumn(baseColumns.get(i)),
	this.getBaseTable().getColumn(refColumns.get(i))
	);
	}
	return ArrayTools.sort(result, this.buildColumnPairComparator());
	}

	private Comparator<ColumnPair> buildColumnPairComparator() {
	return new Comparator<ColumnPair>() {
	public int compare(ColumnPair columnPair1, ColumnPair columnPair2) {
	return Collator.getInstance().compare(columnPair1.getBaseColumn().getName(), columnPair2.getBaseColumn().getName());
	}
	};
	}

	// minimize scope of suppressed warnings
	@SuppressWarnings("unchecked")
	private List<org.eclipse.datatools.modelbase.sql.tables.Column> getDTPBaseColumns() {
	return this.dtpForeignKey.getMembers();
	}

	// minimize scope of suppressed warnings
	@SuppressWarnings("unchecked")
	private List<org.eclipse.datatools.modelbase.sql.tables.Column> getDTPReferenceColumns() {
	return this.dtpForeignKey.getUniqueConstraint().getMembers();
	}

	public int columnPairsSize() {
	return this.getColumnPairs().length;
	}

	public Iterator<Column> baseColumns() {
	return new TransformationIterator<LocalColumnPair, Column>(this.localColumnPairs()) {
	@Override
	protected Column transform(LocalColumnPair pair) {
	return pair.getBaseColumn();
	}
	};
	}

	boolean baseColumnsContains(Column column) {
	return CollectionTools.contains(this.baseColumns(), column);
	}

	public Iterator<Column> nonPrimaryKeyBaseColumns() {
	return new FilteringIterator<Column, Column>(this.baseColumns()) {
	@Override
	protected boolean accept(Column column) {
	return ! column.isPartOfPrimaryKey();
	}
	};
	}

	public Iterator<Column> referencedColumns() {
	return new TransformationIterator<LocalColumnPair, Column>(this.localColumnPairs()) {
	@Override
	protected Column transform(LocalColumnPair columnPair) {
	return columnPair.getReferencedColumn();
	}
	};
	}

	// ***** attribute name

	public String getAttributeName() {
	String defaultName = this.getDefaultAttributeName();
	return (defaultName != null) ? defaultName : this.getNonDefaultAttributeName();
	}

	public synchronized String getDefaultAttributeName() {
	if ( ! this.defaultAttributeNameCalculated) {
	this.defaultAttributeNameCalculated = true;
	this.defaultAttributeName = this.buildDefaultAttributeName();
	}
	return this.defaultAttributeName;
	}

	private String buildDefaultAttributeName() {
	if ( ! this.referencesSingleColumnPrimaryKey()) {
	return null;
	}
	LocalColumnPair columnPair = this.getColumnPair();
	String baseColName = columnPair.getBaseColumn().getName();
	String refColName = columnPair.getReferencedColumn().getName();
	if (baseColName.length() <= (refColName.length() + 1)) {
	return null;
	}
	if ( ! baseColName.endsWith(refColName)) {
	return null;
	}
	int _index = baseColName.length() - refColName.length() - 1;
	if (baseColName.charAt(_index) != '_') {
	return null;
	}
	return baseColName.substring(0, _index);
	}

	/**
	* If this is a simple (single-column) foreign key, use the name of the
	* single base column to build a name. If this is a compound foreign key,
	* return the name of the referenced table.
	*/
	// TODO if there is only one FK to a given table, use the table's name instead of the column's name?
	private String getNonDefaultAttributeName() {
	return (this.columnPairsSize() == 1) ?
	this.getNonDefaultAttributeNameFromBaseColumn()
	:
	this.getReferencedTable().getName();
	}

	/**
	* The underscore check is helpful when the referenced column is NOT the
	* primary key of the referenced table (i.e. it has only a UNIQUE constraint).
	* ForeignKey(EMP.CUBICLE_ID => CUBICLE.ID) => "CUBICLE"
	* ForeignKey(EMP.CUBICLEID => CUBICLE.ID) => "CUBICLE"
	* ForeignKey(EMP.CUBICLE_PK => CUBICLE.ID) => "CUBICLE_PK"
	*/
	private String getNonDefaultAttributeNameFromBaseColumn() {
	LocalColumnPair columnPair = this.getColumnPair();
	String baseColName = columnPair.getBaseColumn().getName();
	String refColName = columnPair.getReferencedColumn().getName();
	int len = baseColName.length();
	int refLen = refColName.length();
	if ((len > refLen) && baseColName.endsWith(refColName)) {
	len = len - refLen;
	if ((len > 1) && baseColName.charAt(len - 1) == '_') {
	len = len - 1;
	}
	}
	return baseColName.substring(0, len);
	}

	/**
	* Examples:
	* Oracle etc.
	* ForeignKey(FOO_ID => ID) vs. "foo" => null
	* ForeignKey(FOO_ID => FOO_ID) vs. "foo" => "FOO_ID"
	* ForeignKey(FOO => ID) vs. "foo" => "FOO"
	* ForeignKey(Foo_ID => ID) vs. "foo" => "\"Foo_ID\""
	*
	* PostgreSQL etc.
	* ForeignKey(foo_id => id) vs. "foo" => null
	* ForeignKey(foo_id => foo_id) vs. "foo" => "foo_id"
	* ForeignKey(foo => id) vs. "foo" => "foo"
	* ForeignKey(Foo_ID => ID) vs. "foo" => "\"Foo_ID\""
	*
	* SQL Server etc.
	* ForeignKey(foo_ID => ID) vs. "foo" => null
	* ForeignKey(FOO_ID => FOO_ID) vs. "foo" => "FOO_ID"
	* ForeignKey(FOO => ID) vs. "foo" => "FOO"
	* ForeignKey(Foo_ID => ID) vs. "foo" => "Foo_ID"
	*/
	public String getJoinColumnAnnotationIdentifier(String attributeName) {
	String baseColumnName = this.getColumnPair().getBaseColumn().getName();
	String defaultBaseColumnName = attributeName + '_' + this.getReferencedTable().getPrimaryKeyColumn().getName();
	return this.getDatabase().convertNameToIdentifier(baseColumnName, defaultBaseColumnName);
	}


	// ******** internal methods ********

	boolean wraps(org.eclipse.datatools.modelbase.sql.constraints.ForeignKey foreignKey) {
	return this.dtpForeignKey == foreignKey;
	}

	@Override
	synchronized void clear() {
	// the foreign key does not "contain" any other objects,
	// so we don't need to forward the #clear()
	this.defaultAttributeNameCalculated = false;
	this.defaultAttributeName = null;
	this.columnPairs = null;
	this.referencedTable = null;
	}


	// ******** column pair implementation ********

	static class LocalColumnPair implements ColumnPair {
	private final DTPColumnWrapper baseColumn;
	private final DTPColumnWrapper referencedColumn;

	LocalColumnPair(DTPColumnWrapper baseColumn, DTPColumnWrapper referencedColumn) {
	super();
	if ((baseColumn == null) \|\| (referencedColumn == null)) {
	throw new NullPointerException();
	}
	this.baseColumn = baseColumn;
	this.referencedColumn = referencedColumn;
	}

	public DTPColumnWrapper getBaseColumn() {
	return this.baseColumn;
	}

	public DTPColumnWrapper getReferencedColumn() {
	return this.referencedColumn;
	}

	@Override
	public String toString() {
	return StringTools.buildToStringFor(this, this.baseColumn.getName() + "=>" + this.referencedColumn.getName()); //$NON-NLS-1$
	}

	}

	}