hibernatecfmodelmanager.java

eclipse的hibernate插件,支持eclipse2.*版本

/*
 * Created on 2003-7-25
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package com.tanghan.plugin.hibernate.editor;

import java.util.Hashtable;
import java.util.List;
import java.util.Vector;

import org.apache.log4j.Logger;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.pde.core.IModel;
import org.eclipse.pde.internal.core.IModelProvider;
import org.eclipse.pde.internal.core.IModelProviderListener;

import com.tanghan.plugin.TanghanPlugin;
import com.tanghan.util.Log;

/**
 * @author Jerry Tang
 * @version v0.1.0
 * @copyright  (C) 2003 Tanghan Studio
 */
public class HibernateCFModelManager
	implements IModelProvider, IResourceChangeListener ,IResourceDeltaVisitor{

	private static Logger log = Log.getInstanse().getLogger(HibernateCFModelManager.class);
	
	/** Workspace hibernate models */
	private List hibernateModels;
	protected List listeners;
	protected Hashtable models;
	protected List modelChanges;
	
	/** init flag */
	private boolean initialized = false;
	
	class ModelChange {
		IModel model;
		boolean added;
		public ModelChange(IModel model, boolean added) {
			this.model = model;
			this.added = added;
		}
	}
		
	class ModelInfo {
		int count;
		IModel model;
		IModel readOnlyModel;
		Object consumer;
		public boolean isExclusiveAccess() {
			return true;
		}
	}
	
	/**
	 * 
	 */
	public HibernateCFModelManager() {
		hibernateModels = new Vector();
		models = new Hashtable();
		listeners = new Vector();
		IWorkspace workspace = TanghanPlugin.getWorkspace();
		workspace.addResourceChangeListener(
			this,IResourceChangeEvent.PRE_CLOSE
				| IResourceChangeEvent.PRE_DELETE
				| IResourceChangeEvent.PRE_AUTO_BUILD);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#addModelProviderListener(org.eclipse.pde.internal.core.IModelProviderListener)
	 */
	public void addModelProviderListener(IModelProviderListener listener) {
		listeners.add(listener);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#connect(java.lang.Object, java.lang.Object)
	 */
	public void connect(Object element, Object consumer) {
		this.connect(element, consumer, true);
	}

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#connect(java.lang.Object, java.lang.Object, boolean)
	 */
	public void connect(
		Object element,
		Object consumer,
		boolean editableCopy) {
			//得到一个编辑器和模型之间的连接
			ModelInfo info = (ModelInfo) models.get(element);
			if (info == null) {
				info = new ModelInfo();
				info.count = 0;
				models.put(element, info);
			}
			info.count++;
			if (info.model == null && editableCopy) {
				info.model = createModel(element);
				info.consumer = consumer;
			} else {
				info.readOnlyModel = createModel(element, false);
			}

	}
	/**
	 * Method createModel.
	 * @param element
	 * @return IModel
	 */
	protected IModel createModel(Object element) {
		return createModel(element, true);
	}
	/**
	 * Method createModel.
	 * @param element
	 * @param editable
	 * @return IModel
	 */
	protected IModel createModel(Object element, boolean editable) {
		if (element instanceof IFile) {
			IFile file = (IFile) element;
			HibernateCFModel model = new HibernateCFModel(file); 
			model.setEditable(true);
			return model;	
		}
		return null;
	}	

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#disconnect(java.lang.Object, java.lang.Object)
	 */
	public void disconnect(Object element, Object consumer) {
		ModelInfo info = (ModelInfo) models.get(element);
		if (info != null) {
			info.count--;
			if (info.consumer != null && info.consumer.equals(consumer)) {
				// editable copy can go
				info.model.dispose();
				info.model = null;
			}
			if (info.count == 0) {
				if (info.model != null)
					info.model.dispose();
				info.readOnlyModel = null;
				models.remove(element);
			}
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#getModel(java.lang.Object, java.lang.Object)
	 */
	public IModel getModel(Object element, Object consumer) {
		ModelInfo info = (ModelInfo) models.get(element);
		if (info != null) {
			if (info.consumer != null && info.consumer.equals(consumer))
				return info.model;
			else {
				return info.readOnlyModel;
			}
		}
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.pde.internal.core.IModelProvider#removeModelProviderListener(org.eclipse.pde.internal.core.IModelProviderListener)
	 */
	public void removeModelProviderListener(IModelProviderListener listener) {
		listeners.remove(listener);

	}

	/* 暂时没有用到
	 * (non-Javadoc)
	 * @see org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org.eclipse.core.resources.IResourceChangeEvent)
	 */
	public void resourceChanged(IResourceChangeEvent event) {
		// No need to do anything if nobody has the models
		if (hibernateModels == null)
			return;
		switch (event.getType()) {
			case IResourceChangeEvent.PRE_AUTO_BUILD :
				if (modelChanges == null)
					modelChanges = new Vector();
				break;
			case IResourceChangeEvent.PRE_CLOSE :
				// project about to close
				if (modelChanges == null)
					modelChanges = new Vector();
				break;
			case IResourceChangeEvent.PRE_DELETE :
				// project about to be deleted
				if (modelChanges == null)
					modelChanges = new Vector();
				break;
		}
	}

	/* 暂时没有用到
	 * (non-Javadoc)
	 * @see org.eclipse.core.resources.IResourceDeltaVisitor#visit(org.eclipse.core.resources.IResourceDelta)
	 */
	public boolean visit(IResourceDelta delta) throws CoreException {
		switch (delta.getKind()) {
			case IResourceDelta.ADDED :
				log.debug("// handle added resource");
				break;
			case IResourceDelta.REMOVED :
				log.debug("// handle removed resource");
				break;
			case IResourceDelta.CHANGED :
				log.debug("// handle changed resource");
				break;
			default:
				log.debug("// handle resource type "+delta.getKind());
		}
		return true;
	}

}