Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

*

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

* MA  02110-1301, USA.

*

*/

/*

* AUTHORS (In addition to CIT):

* 2009 IVER T.I   {{Task}}

*/

package org.gvsig.tools.persistence.impl;

import java.io.Writer;

import java.util.ArrayList;

import java.util.Collection;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.util.Map.Entry;

import org.gvsig.tools.persistence.PersistenceException;

import org.gvsig.tools.persistence.Persistent;

import org.gvsig.tools.persistence.impl.exception.PersistenceIllegalStateTheClassNameNotSetException;

import org.gvsig.tools.persistence.impl.exception.PersistenceIllegalStateToSetTheClassNameException;

import org.gvsig.tools.persistence.impl.exception.PersistenceTypeNotSupportedException;

import org.gvsig.tools.persistence.impl.exception.PersistenceUnsuportedMapKeyTypeException;

import org.gvsig.tools.persistence.impl.exception.PersistenceValueNotFoundException;

public abstract class AbstractPersistentState implements

                ImplementationPersistentState {

        private Map values = new HashMap();

        private PersistentContext context;

        private Integer id;

        private ImplementationPersistenceManager manager;

        private String theClassName = null;

        public AbstractPersistentState(ImplementationPersistenceManager manager,

                        PersistentContext context) {

                this.manager = manager;

                values = new HashMap();

                this.context = context;

        }

        public Object get(String name) throws PersistenceException {

                Object ret = values.get(name);

                if (ret == null && !values.containsKey(name)) {

                        throw new PersistenceValueNotFoundException(name);

                }

                if( ret instanceof ObjectReference){

                        return context.getObject(((ObjectReference) ret).id);

                }

                return ret;

        }

        public boolean getBoolean(String name) throws PersistenceException {

                return ((Boolean) get(name)).booleanValue();

        }

        public double getDouble(String name) throws PersistenceException {

                return ((Double) get(name)).doubleValue();

        }

        public float getFloat(String name) throws PersistenceException {

                return ((Float) get(name)).floatValue();

        }

        public int getInt(String name) throws PersistenceException {

                return ((Integer) get(name)).intValue();

        }

        public Iterator getIterator(String name) throws PersistenceException {

                return ((Collection) get(name)).iterator();

        }

        public long getLong(String name) throws PersistenceException {

                return ((Long) get(name)).longValue();

        }

        public Iterator getNames() {

                return values.keySet().iterator();

        }

        public String getString(String name) throws PersistenceException {

                return ((String) get(name));

        }

        public void set(String name, String value) throws PersistenceException {

                setValue(name, value);

        }

        public void set(String name, int value) throws PersistenceException {

                setValue(name, new Integer(value));

        }

        public void set(String name, long value) throws PersistenceException {

                setValue(name, new Long(value));

        }

        public void set(String name, double value) throws PersistenceException {

                setValue(name, new Double(value));

        }

        public void set(String name, float value) throws PersistenceException {

                setValue(name, new Float(value));

        }

        public void set(String name, boolean value) throws PersistenceException {

                setValue(name, new Boolean(value));

        }

        public void set(String name, Persistent obj) throws PersistenceException {

                setValue(name, getObjectToPersist(obj));

        }

        public void set(String name, Object obj) throws PersistenceException {

                setValue(name, getObjectToPersist(obj));

        }

        /**

         * Checks class of <code>theOriginal</code> and transforms it if is

         * necessary.<br>

         *

         * @param theOriginal

         * @return

         * @throws PersistenceException

         */

        protected Object getObjectToPersist(Object theOriginal)

                        throws PersistenceException {

                if (theOriginal instanceof Number) {

                        return theOriginal;

                } else if (theOriginal instanceof String) {

                        return theOriginal;

                } else if (theOriginal instanceof Boolean){

                        return theOriginal;

                } else if (theOriginal instanceof Map) {

                        Map result = new HashMap(((Map) theOriginal).size());

                        storeValues(result, (Map) theOriginal);

                        return result;

                } else if (theOriginal instanceof Set) {

                        Set result = new HashSet(((Set) theOriginal).size());

                        storeValues(result, ((Set) theOriginal).iterator());

                        return result;

                } else if (theOriginal instanceof List) {

                        List result = new ArrayList(((List) theOriginal).size());

                        storeValues(result, (((List) theOriginal).iterator()));

                        return result;

                } else if (theOriginal instanceof Persistent){

                        Integer id = context.getId((Persistent) theOriginal);

                        if (id == null) {

                                ImplementationPersistentState state = manager.createState(

                                                (Persistent) theOriginal, context);

                                id = state.getId();

                        }

                        return new ObjectReference(id);

                } else {

                        throw new PersistenceTypeNotSupportedException(theOriginal

                                        .getClass());

                }

        }

        public class ObjectReference {

                public Integer id;

                public ObjectReference(Integer id) {

                        this.id = id;

                }

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#setId(java.lang.Integer)

         */

        public void setId(Integer id) {

                this.id = id;

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#getId()

         */

        public Integer getId() {

                return id;

        }

        private void setValue(String name, Object value)

                        throws PersistenceIllegalStateTheClassNameNotSetException {

                if (this.theClassName == null) {

                        throw new PersistenceIllegalStateTheClassNameNotSetException();

                }

                this.values.put(name,value);

        }

        public String getTheClassName() {

                return theClassName;

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#setTheClassName(java.lang.String)

         */

        public void setTheClassName(String className) throws PersistenceException {

                if (this.size() != 0){

                        throw new PersistenceIllegalStateToSetTheClassNameException();

                }

                theClassName = className;

        }

        /*

         * (non-Javadoc)

         *

         * @see org.gvsig.tools.persistence.PersistentState#set(java.lang.String,

         * java.util.Iterator)

         */

        public void set(String name, Iterator it) throws PersistenceException {

                List list = new ArrayList();

                storeValues(list, it);

                set(name, list);

        }

        private void storeValues(Collection storage, Iterator iter)

                        throws PersistenceException {

                while (iter.hasNext()) {

                        storage.add(getObjectToPersist(iter.next()));

                }

        }

        private void storeValues(Map storage, Map originalStorage)

                        throws PersistenceException {

                Iterator iter = originalStorage.entrySet().iterator();

                Entry orgEntry;

                Object key;

                Object value;

                while (iter.hasNext()){

                        orgEntry = (Entry) iter.next();

                        key = orgEntry.getKey();

                        if (key == null) {

                                // Nothing to do

                        } else if (key instanceof String) {

                                // Nothing to do

                        } else if (key instanceof Number) {

                                // Nothing to do

                        } else if (key instanceof Boolean) {

                                // Nothing to do

                        } else if (key instanceof Persistent) {

                                key = getObjectToPersist(key);

                        } else {

                                throw new PersistenceUnsuportedMapKeyTypeException(orgEntry

                                                .getKey().getClass());

                        }

                        value = getObjectToPersist(orgEntry.getValue());

                        storage.put(key, value);

                }

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#getContext()

         */

        public PersistentContext getContext() {

                return context;

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#size()

         */

        public int size() {

                return this.values.size();

        }

        /* (non-Javadoc)

         * @see org.gvsig.tools.persistence.impl.ImplementationPersistentState#hasValue(java.lang.String)

         */

        public boolean hasValue(String name) {

                return this.values.containsKey(name);

        }

        /*

         * (non-Javadoc)

         * 

         * @see org.gvsig.tools.persistence.PersistentState#save(java.io.Writer)

         */

        public void save(Writer writer) throws PersistenceException {

                this.manager.saveState(this, writer);

        }

}