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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.beans;
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import com.tirsen.angkor.table.AbstractTableModel;
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import com.tirsen.angkor.widget.ValueModel;
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import java.beans.BeanInfo;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.List;
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public abstract class BeanTableModel extends AbstractTableModel
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{
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private Class rowClass;
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private List columns;
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public BeanTableModel()
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{
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}
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public BeanTableModel(Class rowClass)
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{
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this.rowClass = rowClass;
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}
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public interface TableColumnModel extends Serializable
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{
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String getName();
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ValueModel getValue(Object row);
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}
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private static class PropertyTableColumnModel implements TableColumnModel
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{
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private String name;
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private PropertyDescriptor property;
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public PropertyTableColumnModel(PropertyDescriptor property)
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{
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this.property = property;
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}
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public PropertyTableColumnModel(String name, PropertyDescriptor property)
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{
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this.name = name;
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this.property = property;
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}
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public String getName()
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{
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return name == null ? property.getDisplayName() : name;
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}
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public ValueModel getValue(Object row)
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{
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return new PropertyValueModel(row, property);
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}
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}
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/**
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* Resets the columns.
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*/
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public void resetColumns()
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{
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columns = null;
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}
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/**
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* If the columns are not already created creates columns based on all the properties in the beans.
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*/
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private void createDefaultColumns()
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{
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if (columns == null)
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{
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try
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{
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PropertyDescriptor[] properties = getProperties();
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columns = new ArrayList(properties.length);
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for (int i = 0; i < properties.length; i++)
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{
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PropertyDescriptor property = properties[i];
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addColumn(new PropertyTableColumnModel(property));
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}
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}
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catch (IntrospectionException e)
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{
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throw new RuntimeException(e.getMessage());
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}
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}
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}
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private PropertyDescriptor[] getProperties() throws IntrospectionException
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{
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Class beanClass = getRowClass();
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BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
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PropertyDescriptor[] properties = beanInfo.getPropertyDescriptors();
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return properties;
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}
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protected Class getRowClass()
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{
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Class cls = rowClass;
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if (cls == null && getRowCount() > 0) cls = getRow(0).getClass();
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if (cls == null) cls = getRows().getClass().getComponentType();
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if (cls == null) throw new IllegalStateException("Could not determine class of objects used for rows.");
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return cls;
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}
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public void addColumn(TableColumnModel column)
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{
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columns.add(column);
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}
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public PropertyDescriptor findProperty(String property)
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{
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try
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{
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PropertyDescriptor[] properties = getProperties();
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for (int i = 0; i < properties.length; i++)
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{
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PropertyDescriptor propertyDesc = properties[i];
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if (propertyDesc.getName().equals(property)) return propertyDesc;
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}
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throw new IntrospectionException("No such property " + property);
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}
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catch (IntrospectionException e)
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{
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throw new RuntimeException(e.getMessage());
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}
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}
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public void addColumn(String name, String property)
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{
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if (columns == null) columns = new ArrayList(1);
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columns.add(new PropertyTableColumnModel(name, findProperty(property)));
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}
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public String getColumnName(int column)
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{
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return getColumn(column).getName();
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}
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public int getColumnCount()
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{
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createDefaultColumns();
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return columns.size();
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}
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public ValueModel getValueAt(int row, int column)
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{
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return (getColumn(column)).getValue(getRow(row));
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}
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private TableColumnModel getColumn(int column)
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{
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createDefaultColumns();
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return (TableColumnModel) columns.get(column);
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}
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/**
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* Gets the value object for a specified row, also checks wheather row is within range specified by
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* {@link #setRange(int,int)}.
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* @throws IllegalArgumentException if <code>row</code> parameter is outside specified range.
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*/
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public Object getRow(int row)
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{
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if (row < getStart() || row > getEnd())
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{
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throw new IllegalArgumentException("Tried to access row " + row +
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" outside range (" + getStart() + ", " + getEnd() + ").");
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}
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return getRows().get(row);
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}
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protected abstract List getRows();
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}
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