ws.moor.swissvault.persistence.model.Property.java Source code

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Here is the source code for ws.moor.swissvault.persistence.model.Property.java

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/*
 * Copyright 2012 Patrick Moor <patrick@moor.ws>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ws.moor.swissvault.persistence.model;

import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Text;
import com.google.common.base.Function;
import com.google.common.base.Functions;
import ws.moor.swissvault.auth.UserId;
import ws.moor.swissvault.domain.EncryptedValue;

import java.util.Date;
import java.util.List;

public class Property<T> {

    private final String name;
    private final Function<T, Object> serialize;
    private final Function<Object, T> deserialize;

    @SuppressWarnings("unchecked")
    private Property(String name) {
        this(name, (Function<T, Object>) Functions.identity(), (Function<Object, T>) Functions.identity());
    }

    private Property(String name, Function<T, Object> serialize, Function<Object, T> deserialize) {
        this.name = name;
        this.serialize = serialize;
        this.deserialize = deserialize;
    }

    public T get(Entity entity) {
        return deserialize.apply(entity.getProperty(name));
    }

    public void set(Entity entity, T value) {
        entity.setProperty(name, serialize.apply(value));
    }

    public String getName() {
        return name;
    }

    public static Property<String> string(String name) {
        return new Property<String>(name);
    }

    public static Property<Date> date(String name) {
        return new Property<Date>(name);
    }

    public static Property<UserId> userId(String name) {
        return new Property<UserId>(name, new Function<UserId, Object>() {
            public String apply(UserId input) {
                return input.asString();
            }
        }, new Function<Object, UserId>() {
            public UserId apply(Object input) {
                return UserId.fromString((String) input);
            }
        });
    }

    public static Property<EncryptedValue> encryptedValue(String name) {
        return new Property<EncryptedValue>(name, new Function<EncryptedValue, Object>() {
            public Text apply(EncryptedValue input) {
                return input.toText();
            }
        }, new Function<Object, EncryptedValue>() {
            public EncryptedValue apply(Object input) {
                return EncryptedValue.fromText((Text) input);
            }
        });
    }

    public static Property<List<EncryptedValue>> encryptedValues(String name) {
        return new Property<List<EncryptedValue>>(name, new Function<List<EncryptedValue>, Object>() {
            public List<Text> apply(List<EncryptedValue> input) {
                return EncryptedValue.toTextList(input);
            }
        }, new Function<Object, List<EncryptedValue>>() {
            public List<EncryptedValue> apply(Object input) {
                return EncryptedValue.fromTextList((List<Text>) input);
            }
        });
    }
}