org.apache.olingo.ext.proxy.commons.AbstractEntityCollectionInvocationHandler.java Source code

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Here is the source code for org.apache.olingo.ext.proxy.commons.AbstractEntityCollectionInvocationHandler.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.olingo.ext.proxy.commons;

import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.tuple.ImmutableTriple;
import org.apache.commons.lang3.tuple.Triple;
import org.apache.olingo.client.api.ODataClient;
import org.apache.olingo.client.api.communication.request.retrieve.ODataEntitySetRequest;
import org.apache.olingo.client.api.communication.response.ODataRetrieveResponse;
import org.apache.olingo.client.api.uri.URIBuilder;
import org.apache.olingo.client.api.domain.ClientAnnotation;
import org.apache.olingo.client.api.domain.ClientEntity;
import org.apache.olingo.client.api.domain.ClientEntitySet;
import org.apache.olingo.client.api.domain.ClientSingleton;
import org.apache.olingo.ext.proxy.AbstractService;
import org.apache.olingo.ext.proxy.api.AbstractEntitySet;
import org.apache.olingo.ext.proxy.api.AbstractSingleton;
import org.apache.olingo.ext.proxy.api.EntityCollection;
import org.apache.olingo.ext.proxy.api.EntityType;
import org.apache.olingo.ext.proxy.utils.ClassUtils;

//CHECKSTYLE:OFF
public abstract class AbstractEntityCollectionInvocationHandler<T extends EntityType<?>, EC extends EntityCollection<T, ?, ?>>
        extends AbstractCollectionInvocationHandler<T, EC> {
    //CHECKSTYLE:ON
    protected URI targetEntitySetURI;

    private boolean isSingleton = false;

    protected final Class<EC> collItemRef;

    @SuppressWarnings("unchecked")
    public AbstractEntityCollectionInvocationHandler(final Class<?> ref, final AbstractService<?> service,
            final URIBuilder uri) {

        super(service, new ArrayList<T>(), (Class<T>) ClassUtils.extractTypeArg(ref, AbstractEntitySet.class,
                AbstractSingleton.class, EntityCollection.class), uri);

        this.targetEntitySetURI = uri.build();
        this.isSingleton = AbstractSingleton.class.isAssignableFrom(ref);

        final Type[] entitySetParams = ClassUtils.extractGenericType(ref, AbstractEntitySet.class,
                AbstractSingleton.class);

        if (entitySetParams != null) {
            this.collItemRef = (Class<EC>) entitySetParams[2];
        } else {
            this.collItemRef = null;
        }
    }

    @SuppressWarnings("unchecked")
    public AbstractEntityCollectionInvocationHandler(final Class<? extends EntityCollection<T, ?, ?>> ref,
            final AbstractService<?> service, final URI targetEntitySetURI, final URIBuilder uri) {
        super(service, new ArrayList<T>(), (Class<T>) ClassUtils.extractTypeArg(ref, EntityCollection.class), uri);

        this.uri = uri;
        this.targetEntitySetURI = targetEntitySetURI;
        this.collItemRef = (Class<EC>) ref;
    }

    @SuppressWarnings("unchecked")
    @Override
    public Triple<List<T>, URI, List<ClientAnnotation>> fetchPartial(final URI uri, final Class<T> typeRef) {

        final List<ClientEntity> entities = new ArrayList<ClientEntity>();
        final URI next;
        final List<ClientAnnotation> anns = new ArrayList<ClientAnnotation>();

        if (isSingleton) {
            final ODataRetrieveResponse<ClientSingleton> res = ((ODataClient) getClient())
                    .getRetrieveRequestFactory().getSingletonRequest(uri).execute();

            entities.add(res.getBody());
            next = null;
        } else {
            final ODataEntitySetRequest<ClientEntitySet> req = getClient().getRetrieveRequestFactory()
                    .getEntitySetRequest(uri);
            req.setPrefer(getClient().newPreferences().includeAnnotations("*"));

            final ODataRetrieveResponse<ClientEntitySet> res = req.execute();

            final ClientEntitySet entitySet = res.getBody();
            entities.addAll(entitySet.getEntities());
            next = entitySet.getNext();
            anns.addAll(entitySet.getAnnotations());
        }

        final List<T> res = new ArrayList<T>(entities.size());

        for (ClientEntity entity : entities) {
            Class<?> actualRef = null;
            if (entity.getTypeName() != null) {
                actualRef = service.getEntityTypeClass(entity.getTypeName().toString());
            }
            if (actualRef == null) {
                actualRef = typeRef;
            }

            final EntityInvocationHandler handler = this instanceof EntitySetInvocationHandler
                    ? EntityInvocationHandler.getInstance(entity, EntitySetInvocationHandler.class.cast(this),
                            actualRef)
                    : EntityInvocationHandler.getInstance(entity, targetEntitySetURI, actualRef, service);

            final EntityInvocationHandler handlerInTheContext = getContext().entityContext()
                    .getEntity(handler.getUUID());

            res.add((T) Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                    new Class<?>[] { actualRef }, handlerInTheContext == null ? handler : handlerInTheContext));
        }

        return new ImmutableTriple<List<T>, URI, List<ClientAnnotation>>(res, next, anns);
    }
}