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Java client API for OData services: Proxy.
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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.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.tuple.ImmutableTriple;
import org.apache.commons.lang3.tuple.Triple;
import org.apache.olingo.client.api.communication.request.retrieve.ODataPropertyRequest;
import org.apache.olingo.client.api.communication.response.ODataRetrieveResponse;
import org.apache.olingo.client.api.uri.URIBuilder;
import org.apache.olingo.client.api.domain.ClientProperty;
import org.apache.olingo.client.api.domain.ClientAnnotation;
import org.apache.olingo.client.api.domain.ClientValue;
import org.apache.olingo.ext.proxy.AbstractService;
import org.apache.olingo.ext.proxy.api.PrimitiveCollection;

public class PrimitiveCollectionInvocationHandler
        extends AbstractCollectionInvocationHandler> {

  public PrimitiveCollectionInvocationHandler(
          final AbstractService service,
          final Class itemRef) {
    this(service, new ArrayList(), itemRef, null);
  }

  public PrimitiveCollectionInvocationHandler(
          final AbstractService service,
          final Class itemRef,
          final URIBuilder uri) {
    this(service, new ArrayList(), itemRef, uri);
  }

  public PrimitiveCollectionInvocationHandler(
          final AbstractService service,
          final Collection items,
          final Class itemRef,
          final URIBuilder uri) {

    super(service, items, itemRef, uri);
  }

  @Override
  public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
    if ("filter".equals(method.getName())
            || "top".equals(method.getName())
            || "skip".equals(method.getName())
            || "execute".equals(method.getName())
            || "executeAsync".equals(method.getName())) {

      invokeSelfMethod(method, args);
      return proxy;
    } else if (isSelfMethod(method)) {
      return invokeSelfMethod(method, args);
    } else if ("operations".equals(method.getName()) && ArrayUtils.isEmpty(args)) {
      final Class returnType = method.getReturnType();

      return Proxy.newProxyInstance(
              Thread.currentThread().getContextClassLoader(),
              new Class[] {returnType},
              OperationInvocationHandler.getInstance(this));
    } else {
      throw new NoSuchMethodException(method.getName());
    }
  }

  @Override
  @SuppressWarnings("unchecked")
  public Triple, URI, List> fetchPartial(final URI uri, final Class typeRef) {
    final ODataPropertyRequest req =
            getClient().getRetrieveRequestFactory().getPropertyRequest(uri);
      req.setPrefer(getClient().newPreferences().includeAnnotations("*"));

    final ODataRetrieveResponse res = req.execute();

    final List resItems = new ArrayList();

    final ClientProperty property = res.getBody();
    if (property != null && !property.hasNullValue()) {
      for (ClientValue item : property.getCollectionValue()) {
        resItems.add((T) item.asPrimitive().toValue());
      }
    }

    return new ImmutableTriple, URI, List>(
            resItems, null, Collections.emptyList());
  }

  public void delete() {
    if (baseURI != null) {
      getContext().entityContext().addFurtherDeletes(
              getClient().newURIBuilder(baseURI.toASCIIString()).appendValueSegment().build());
    }
  }

  @Override
  public boolean equals(final Object obj) {
    if (obj instanceof Proxy) {
      final InvocationHandler handler = Proxy.getInvocationHandler(obj);
      if (handler instanceof PrimitiveCollectionInvocationHandler) {
        return items.equals(PrimitiveCollectionInvocationHandler.class.cast(handler).items);
      }
    }

    return false;
  }

  @Override
  public int hashCode() {
    return items.hashCode();
  }
}