org.marketcetera.photon.ui.Level2ContentProvider.java Source code

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Here is the source code for org.marketcetera.photon.ui.Level2ContentProvider.java

Source

package org.marketcetera.photon.ui;

import org.eclipse.core.databinding.observable.list.WritableList;
import org.eclipse.jface.databinding.viewers.ObservableListContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.marketcetera.core.ClassVersion;
import org.marketcetera.photon.Messages;
import org.marketcetera.photon.PhotonPlugin;

import quickfix.Message;
import quickfix.field.MDEntryType;
import quickfix.field.NoMDEntries;
import quickfix.fix42.MarketDataSnapshotFullRefresh;

/* $License$ */

/**
 * Organizes Level II or Depth-of-Book data to be displayed in a UI list.
 *
 * @author gmiller
 * @author <a href="mailto:colin@marketcetera.com">Colin DuPlantis</a>
 * @version $Id$
 * @since 0.6.0
 */
@ClassVersion("$Id$") //$NON-NLS-1$
public class Level2ContentProvider extends ObservableListContentProvider implements Messages {
    /**
     * stores the last message received
     */
    private Message currentMessage;
    /**
     * the most recent state of the display list
     */
    private WritableList currentList;
    /**
     * indicates the type of provider, containing a <code>MDEntryType</code>
     */
    private final char entryType;
    /**
     * the list to which the UI widget is bound
     */
    private final WritableList mViewList;

    /**
     * Create a new Level2ContentProvider instance.
     *
     * @param entryType a <code>char</code> value indicating the <code>MDEntryType</code> to use 
     * @param inViewList a <code>WritableList</code> value containing the <code>Collection</code> to which the display widget is bound
     */
    public Level2ContentProvider(char entryType, WritableList inViewList) {
        this.entryType = entryType;
        mViewList = inViewList;
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        if (newInput instanceof Message) {
            currentMessage = (Message) newInput;
            try {
                int noEntries = currentMessage.getInt(NoMDEntries.FIELD);
                for (int i = 0; i < noEntries; i++) {
                    MarketDataSnapshotFullRefresh.NoMDEntries group = new MarketDataSnapshotFullRefresh.NoMDEntries();
                    currentMessage.getGroup(i + 1, group);
                    char currentEntryType = group.getChar(MDEntryType.FIELD);
                    if (entryType == currentEntryType) {
                        mViewList.add(group);
                    }
                }
            } catch (Throwable ex) {
                PhotonPlugin.getMainConsoleLogger().error(CANNOT_PARSE_LEVEL_TWO_DATA.getText());
            }
        }
        super.inputChanged(viewer, currentList, mViewList);
        currentList = mViewList;
    }
}