RandomSec/src/main/java/com/metaweb/gridworks/model/operations/SaveProtographOperation.java

package com.metaweb.gridworks.model.operations;

import java.util.Properties;

import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONWriter;

import com.metaweb.gridworks.history.Change;
import com.metaweb.gridworks.history.HistoryEntry;
import com.metaweb.gridworks.model.AbstractOperation;
import com.metaweb.gridworks.model.Project;
import com.metaweb.gridworks.protograph.Protograph;

public class SaveProtographOperation extends AbstractOperation {
    private static final long serialVersionUID = 3134524625206033285L;
    
    final protected Protograph _protograph;
    
    static public AbstractOperation reconstruct(Project project, JSONObject obj) throws Exception {
        return new SaveProtographOperation(
            Protograph.reconstruct(obj.getJSONObject("protograph"))
        );
    }
    
	public SaveProtographOperation(
		Protograph protograph
	) {
		_protograph = protograph;
	}

    public void write(JSONWriter writer, Properties options)
        throws JSONException {
    
        writer.object();
        writer.key("op"); writer.value(OperationRegistry.s_opClassToName.get(this.getClass()));
        writer.key("description"); writer.value("Save protograph");
        writer.key("protograph"); _protograph.write(writer, options);
        writer.endObject();
    }

	protected String getBriefDescription() {
		return "Save schema skeleton";
	}

	@Override
	protected HistoryEntry createHistoryEntry(Project project) throws Exception {
        String description = "Save schema-alignment protograph";
        
		Change change = new ProtographChange(_protograph);
		
		return new HistoryEntry(project, description, SaveProtographOperation.this, change);
	}

	static public class ProtographChange implements Change {
		private static final long serialVersionUID = -564820111174473901L;
		
		final protected Protograph 	_newProtograph;
	    protected Protograph		_oldProtograph;
	    
	    public ProtographChange(Protograph protograph) {
	        _newProtograph = protograph;
	    }
	    
	    public void apply(Project project) {
	        synchronized (project) {
	        	_oldProtograph = project.protograph;
	        	project.protograph = _newProtograph;
	        }
	    }

	    public void revert(Project project) {
	        synchronized (project) {
	        	project.protograph = _oldProtograph;
	        }
	    }
	} 
}