| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.contrib.table.model.simple; |
| |
| import java.io.Serializable; |
| import java.util.Comparator; |
| |
| import org.apache.tapestry.IComponent; |
| import org.apache.tapestry.contrib.table.model.ITableRendererSource; |
| import org.apache.tapestry.contrib.table.model.common.AbstractTableColumn; |
| |
| /** |
| * A simple minimal implementation of the |
| * {@link org.apache.tapestry.contrib.table.model.ITableColumn} interface that |
| * provides all the basic services for displaying a column. |
| * |
| * @version $Id$ |
| * @author mindbridge |
| */ |
| public class SimpleTableColumn extends AbstractTableColumn |
| { |
| public static final ITableRendererSource DEFAULT_COLUMN_RENDERER_SOURCE = |
| new SimpleTableColumnRendererSource(); |
| |
| public static final ITableRendererSource FORM_COLUMN_RENDERER_SOURCE = |
| new SimpleTableColumnFormRendererSource(); |
| |
| public static final ITableRendererSource DEFAULT_VALUE_RENDERER_SOURCE = |
| new SimpleTableValueRendererSource(); |
| |
| private String m_strDisplayName; |
| private ITableColumnEvaluator m_objEvaluator; |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name and display name of the column |
| */ |
| public SimpleTableColumn(String strColumnName) |
| { |
| this(strColumnName, strColumnName); |
| } |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name and display name of the column |
| * @param bSortable whether the column is sortable |
| */ |
| public SimpleTableColumn(String strColumnName, boolean bSortable) |
| { |
| this(strColumnName, strColumnName, bSortable); |
| } |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name and display name of the column |
| * @param bSortable whether the column is sortable |
| * @param objEvaluator the evaluator to extract the column value from the row |
| */ |
| public SimpleTableColumn( |
| String strColumnName, |
| ITableColumnEvaluator objEvaluator, |
| boolean bSortable) |
| { |
| this(strColumnName, strColumnName, objEvaluator, bSortable); |
| } |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name of the column |
| * @param strDisplayName the display name of the column |
| */ |
| public SimpleTableColumn(String strColumnName, String strDisplayName) |
| { |
| this(strColumnName, strDisplayName, false); |
| } |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name of the column |
| * @param strDisplayName the display name of the column |
| * @param bSortable whether the column is sortable |
| */ |
| public SimpleTableColumn( |
| String strColumnName, |
| String strDisplayName, |
| boolean bSortable) |
| { |
| this(strColumnName, strDisplayName, null, bSortable); |
| } |
| |
| /** |
| * Creates a SimpleTableColumn |
| * @param strColumnName the identifying name of the column |
| * @param strDisplayName the display name of the column |
| * @param bSortable whether the column is sortable |
| * @param objEvaluator the evaluator to extract the column value from the row |
| */ |
| public SimpleTableColumn( |
| String strColumnName, |
| String strDisplayName, |
| ITableColumnEvaluator objEvaluator, |
| boolean bSortable) |
| { |
| super(strColumnName, bSortable, null); |
| setComparator(new DefaultTableComparator()); |
| setDisplayName(strDisplayName); |
| setColumnRendererSource(DEFAULT_COLUMN_RENDERER_SOURCE); |
| setValueRendererSource(DEFAULT_VALUE_RENDERER_SOURCE); |
| setEvaluator(objEvaluator); |
| } |
| |
| /** |
| * Returns the display name of the column that will be used |
| * in the table header. |
| * Override for internationalization. |
| * @return String the display name of the column |
| */ |
| public String getDisplayName() |
| { |
| return m_strDisplayName; |
| } |
| |
| /** |
| * Sets the displayName. |
| * @param displayName The displayName to set |
| */ |
| public void setDisplayName(String displayName) |
| { |
| m_strDisplayName = displayName; |
| } |
| |
| /** |
| * Returns the evaluator. |
| * @return ITableColumnEvaluator |
| */ |
| public ITableColumnEvaluator getEvaluator() |
| { |
| return m_objEvaluator; |
| } |
| |
| /** |
| * Sets the evaluator. |
| * @param evaluator The evaluator to set |
| */ |
| public void setEvaluator(ITableColumnEvaluator evaluator) |
| { |
| m_objEvaluator = evaluator; |
| } |
| |
| /** |
| * Sets a comparator that compares the values of this column rather than |
| * the objects representing the full rows. <br> |
| * This method allows easier use of standard comparators for sorting |
| * the column. It simply wraps the provided comparator with a row-to-column |
| * convertor and invokes the setComparator() method. |
| * @param comparator The column value comparator |
| */ |
| public void setColumnComparator(Comparator comparator) |
| { |
| setComparator(new ColumnComparator(this, comparator)); |
| } |
| |
| /** |
| * Extracts the value of the column from the row object |
| * @param objRow the row object |
| * @return Object the column value |
| */ |
| public Object getColumnValue(Object objRow) |
| { |
| ITableColumnEvaluator objEvaluator = getEvaluator(); |
| if (objEvaluator != null) |
| return objEvaluator.getColumnValue(this, objRow); |
| |
| // default fallback |
| return objRow.toString(); |
| } |
| |
| /** |
| * Use the column name to get the display name, as well as |
| * the column and value renderer sources from the provided component. |
| * |
| * @param objSettingsContainer the component from which to get the settings |
| */ |
| public void loadSettings(IComponent objSettingsContainer) |
| { |
| String strDisplayName = objSettingsContainer.getMessages().getMessage(getColumnName(), null); |
| if (strDisplayName != null) |
| setDisplayName(strDisplayName); |
| |
| super.loadSettings(objSettingsContainer); |
| } |
| |
| |
| public class DefaultTableComparator implements Comparator, Serializable |
| { |
| public int compare(Object objRow1, Object objRow2) |
| { |
| Object objValue1 = getColumnValue(objRow1); |
| Object objValue2 = getColumnValue(objRow2); |
| |
| if (objValue1 == objValue2) |
| return 0; |
| |
| boolean bComparable1 = objValue1 instanceof Comparable; |
| boolean bComparable2 = objValue2 instanceof Comparable; |
| |
| // non-comparable values are considered equal |
| if (!bComparable1 && !bComparable2) |
| return 0; |
| |
| // non-comparable values (null included) are considered smaller |
| // than the comparable ones |
| if (!bComparable1) |
| return -1; |
| |
| if (!bComparable2) |
| return 1; |
| |
| return ((Comparable) objValue1).compareTo(objValue2); |
| } |
| } |
| |
| } |