Application: gvSIG desktop

package org.gvsig.fmap.dal.feature.impl;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.Iterator;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureStore;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.dal.feature.spi.FeatureData;

import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices;

import org.gvsig.tools.persistence.AbstractPersistenceManager;

import org.gvsig.tools.persistence.PersistenceException;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

public class DefaultFeatureReference implements

                FeatureReferenceProviderServices, Persistent {

        private Object oid;

        private int fDataHashCode;

        private Object[] pk;

        private WeakReference storeRef;

        private boolean isNewFeature;

        public DefaultFeatureReference(DefaultFeature feature) {

                this(feature.getStore(), feature.getData());

        }

        public DefaultFeatureReference(FeatureStore store,

                        FeatureData fdata) {

                this.isNewFeature = fdata.isNew();

                this.oid = null;

                this.pk = null;

                this.storeRef = new WeakReference(store);

                if (fdata.getType().hasOID()) {

                        this.oid = fdata.getOID();

                        if (this.oid == null) {

                                // FIXME: petar

                        }

                } else if (!isNewFeature) {

                        this.pk = this.calculatePK(fdata);

                        if (this.pk == null) {

                                // FIXME: pete

                        }

                } else { // isNew && !hasOID

                        fDataHashCode = fdata.hashCode();

                }

        }

        /*

         * Use only for Persistent.setState

         */

        public DefaultFeatureReference(FeatureStore store) {

                this.isNewFeature = false;

                this.oid = null;

                this.pk = null;

                this.storeRef = new WeakReference(store);

        }

        public DefaultFeatureReference(FeatureStore store, Object oid) {

                this.isNewFeature = false;

                this.oid = oid;

                this.pk = null;

                this.storeRef = new WeakReference(store);

        }

        public DefaultFeatureReference(FeatureStore store, Object[] pk) {

                this.isNewFeature = false;

                this.oid = null;

                this.pk = pk;

                this.storeRef = new WeakReference(store);

        }

        private DefaultFeatureStore getStore() {

                return (DefaultFeatureStore) this.storeRef.get();

        }

        private Object[] calculatePK(FeatureData fdata) {

                ArrayList key = new ArrayList();

                FeatureType type = fdata.getType();

                Iterator it = type.iterator();

                while (it.hasNext()) {

                        FeatureAttributeDescriptor attr = (FeatureAttributeDescriptor) it

                                        .next();

                        if (attr.isPrimaryKey()) {

                                key.add(fdata.get(attr.getIndex()));

                        }

                }

                if (key.size() < 1) {

                        return null;

                }

                return key.toArray();

        }

        public Feature getFeature() throws DataException {

                return this.getStore().getFeatureByReference(this);

        }

        public Feature getFeature(FeatureType featureType) throws DataException {

                return this.getStore().getFeatureByReference(this, featureType);

        }

        public Object[] getKey() {

                return this.pk;

        }

        public Object getOID() {

                return this.oid;

        }

        public boolean isNewFeature() {

                return this.isNewFeature;

        }

        public PersistentState getState() throws PersistenceException {

                return AbstractPersistenceManager.getState(this);

        }

        public void loadState(PersistentState state) throws PersistenceException {

                state.set("oid", oid);

                state.set("isNewFeature", isNewFeature);

                if (pk !=null){

                        state.set("pk.elements", pk.length);

                        for (int i = 0; i < pk.length; i++) {

                                state.set("pk.item" + i, pk[0]);

                        }

                }

        }

        public void setState(PersistentState state) throws PersistenceException {

                this.oid = state.get("oid");

                this.isNewFeature = state.getBoolean("isNewFeature");

                if (state.get("pk.elements")!=null){

                this.pk = new Object[state.getInt("pk.elements")];

                        for (int i = 0; i < pk.length; i++) {

                                this.pk[i] = state.get("pk.item" + i);

                        }

                }

        }

        public boolean equals(Object obj) {

                if (!(obj instanceof DefaultFeatureReference)) {

                        return false;

                }

                DefaultFeatureReference other = (DefaultFeatureReference) obj;

                FeatureStore otherStore = (FeatureStore) other.storeRef.get();

                FeatureStore myrStore = (FeatureStore) this.storeRef.get();

                if (otherStore == null || myrStore == null) {

                        return false;

                }

                if (!myrStore.equals(otherStore)) {

                        return false;

                }

                if (this.oid != null) {

                        return this.oid.equals(other.oid);

                }

                for (int i = 0; i < this.pk.length; i++) {

                        if (!this.pk[i].equals(other.pk[i])) {

                                return false;

                        }

                }

                return true;

        }

        public int hashCode() {

                if (this.oid != null) {

                        return this.oid.hashCode();

                } else {

                        if (this.isNewFeature){

                                return fDataHashCode;

                        }

                        StringBuffer buff = new StringBuffer();

                        for (int i = 0; i < this.pk.length; i++) {

                                buff.append(this.pk[i].hashCode());

                                buff.append("$");

                        }

                        return buff.toString().hashCode();

                }

        }

}