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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.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.StringUtils;
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.ClientAnnotation;
import org.apache.olingo.client.api.domain.ClientCollectionValue;
import org.apache.olingo.client.api.domain.ClientProperty;
import org.apache.olingo.client.api.domain.ClientValue;
import org.apache.olingo.ext.proxy.AbstractService;
import org.apache.olingo.ext.proxy.api.ComplexCollection;
import org.apache.olingo.ext.proxy.api.ComplexType;

public class ComplexCollectionInvocationHandler>
    extends AbstractCollectionInvocationHandler> {

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

  public ComplexCollectionInvocationHandler(
      final Class itemRef,
      final AbstractService service,
      final URIBuilder uri) {

    this(service, new ArrayList(), itemRef, uri);
  }

  public ComplexCollectionInvocationHandler(
      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())
        || "orderBy".equals(method.getName())
        || "top".equals(method.getName())
        || "skip".equals(method.getName())
        || "expand".equals(method.getName())
        || "select".equals(method.getName())
        || "nextPage".equals(method.getName())
        || "execute".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());
    }
  }

  @SuppressWarnings("unchecked")
  @Override
  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.hasCollectionValue()) {
      for (ClientValue item : (ClientCollectionValue) property.getValue()) {
        Class actualRef = null;
        if (StringUtils.isNotBlank(item.getTypeName())) {
          actualRef = service.getComplexTypeClass(item.getTypeName());
        }
        if (actualRef == null) {
          actualRef = typeRef;
        }

        resItems.add((T) getComplex(property.getName(), item, actualRef, null, null, true));
      }
    }

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