Application: gvSIG desktop

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

import java.lang.ref.WeakReference;

import java.util.Base64;

import java.util.UUID;

import javax.json.JsonObject;

import org.apache.commons.lang3.StringUtils;

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

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

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

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

import org.gvsig.fmap.dal.feature.impl.DefaultFeatureStore;

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

import org.gvsig.json.Json;

import org.gvsig.json.JsonObjectBuilder;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.PersistentState;

import org.gvsig.tools.persistence.exception.PersistenceException;

/**

 *

 * @author fdiaz

 */

public class FeatureReferenceUID implements FeatureReferenceProviderServices, Persistent {

    public static final String UID_TYPE = "uid";

    private String uid;

    private WeakReference storeRef;

    private String featureTypeId;

    /*friend*/

    FeatureReferenceUID(FeatureStore store) {

        this(store, (String)null);

    }

    /*friend*/

    FeatureReferenceUID(FeatureStore store, JsonObject code) {

        this(store, code.getString(UID_TYPE, null));

    }

    private FeatureReferenceUID(FeatureStore store, String uid) {

            this.storeRef = new WeakReference(store);

        this.featureTypeId = store.getDefaultFeatureTypeQuietly().getId();

        if(StringUtils.isBlank(uid)){

            this.uid = this.generateUUID();

        } else {

            this.uid = uid;

        }

    }

    public FeatureReferenceUID() {

        //For persistence use only

    }

    private String generateUUID() {

        UUID x = UUID.randomUUID();

        String s = x.toString().replace("-", "");

        return s;

    }

    @Override

    public Object getOID() {

        return null;

    }

    @Override

    public String[] getKeyNames() {

        return null;

    }

    @Override

    public Object getKeyValue(String name) {

        return null;

    }

    @Override

    public String getFeatureTypeId() {

        return featureTypeId;

    }

    @Override

    public Feature getFeature() throws DataException {

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

    }

    @Override

    public Feature getFeatureQuietly() {

        try {

            return this.getFeature();

        } catch (Exception e) {

            return null;

        }

    }

    @Override

    public Feature getFeature(FeatureType featureType) throws DataException {

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

    }

    private DefaultFeatureStore getStore() {

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

    }

    @Override

    public boolean isNewFeature() {

        return true;

    }

    @Override

    public String getCode() {

        String s = this.toJsonBuilder().toString();

        String r = Base64.getEncoder().encodeToString(s.getBytes());

        return r;

    }

    @Override

    public void saveToState(PersistentState state) throws PersistenceException {

        state.set("type", UID_TYPE);

        state.set("uid", uid);

        state.set("store", (Persistent) storeRef.get());

        state.set("featureTypeId", featureTypeId);

        state.set("isNewFeature", isNewFeature());

    }

    @Override

    public void loadFromState(PersistentState state) throws PersistenceException {

        this.uid =  state.getString("uuid");

        this.storeRef = new WeakReference(state.get("store"));

        this.featureTypeId = state.getString("featureTypeId");

    }

    @Override

    public boolean equals(Object obj) {

        if (!(obj instanceof FeatureReferenceUID)) {

            return false;

        }

        FeatureReferenceUID other = (FeatureReferenceUID) 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;

        }

        return StringUtils.equals(this.uid,other.uid);

    }

    @Override

    public int hashCode() {

        if (this.uid != null) {

            return this.uid.hashCode();

        }

        return -1;

    }

    @Override

    public JsonObjectBuilder toJsonBuilder() {

        JsonObjectBuilder builder = Json.createObjectBuilder();

        builder.add("type", UID_TYPE);

        builder.add("uid", this.uid);

        return builder;

    }

}