ResourceModelUpdater.java

/**
 * 
 */
package org.commcare.android.database.app.models;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Vector;

import org.commcare.resources.model.Resource;
import org.commcare.resources.model.ResourceInstaller;
import org.commcare.resources.model.ResourceLocation;
import org.javarosa.core.util.externalizable.DeserializationException;
import org.javarosa.core.util.externalizable.ExtUtil;
import org.javarosa.core.util.externalizable.ExtWrapList;
import org.javarosa.core.util.externalizable.ExtWrapTagged;
import org.javarosa.core.util.externalizable.PrototypeFactory;

/**
 * A model extension which reads Resource models from the
 * Version 2 db, and writes them back into the Version 3
 * db.
 * 
 * 
 * NOTE: This updater is _NOT ROBUST AGAINST METADATA
 * CHANGES_. If the Resource model metadata changes, this
 * needs to be modified to reflect the V2/3 metadata.  
 * 
 * @author ctsims
 *
 */
public class ResourceModelUpdater extends Resource {
    
    /**
     Blank constructor for deserialization only!
    */
    public ResourceModelUpdater() {
        
    }
    
    /* (non-Javadoc)
     * @see org.commcare.resources.model.Resource#readExternal(java.io.DataInputStream, org.javarosa.core.util.externalizable.PrototypeFactory)
     */
    @Override
    public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException {
        this.recordId = ExtUtil.readInt(in);
        this.version = ExtUtil.readInt(in);
        this.id = ExtUtil.readString(in);
        this.guid = ExtUtil.readString(in);
        this.status = ExtUtil.readInt(in);
        this.parent = ExtUtil.nullIfEmpty(ExtUtil.readString(in));
        
        locations = (Vector<ResourceLocation>)ExtUtil.read(in, new ExtWrapList(ResourceLocation.class),pf);
        this.initializer = (ResourceInstaller)ExtUtil.read(in, new ExtWrapTagged(), pf);
    }
    
    /*
     * (non-Javadoc)
     * @see org.javarosa.core.util.externalizable.Externalizable#writeExternal(java.io.DataOutputStream)
     */
    public void writeExternal(DataOutputStream out) throws IOException {
        ExtUtil.writeNumeric(out,recordId);
        ExtUtil.writeNumeric(out,version);
        ExtUtil.writeString(out, id);
        ExtUtil.writeString(out,guid);
        ExtUtil.writeNumeric(out,status);
        ExtUtil.writeString(out, ExtUtil.emptyIfNull(parent));
        
        ExtUtil.write(out, new ExtWrapList(locations));
        ExtUtil.write(out, new ExtWrapTagged(initializer));
        ExtUtil.writeString(out,  ExtUtil.emptyIfNull((String)null));
    }

}