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KalturaOttApiClient is a library of Java classes that can be used to interact with the Kaltura OTT REST API. More information about the REST API can be found at https://ott.developer.kaltura.com/ Many of the Java classes in this library are auto-generated from a schema that defines the objects that are used to interact with the API.
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package com.kaltura.client.utils.request;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;

import com.kaltura.client.Params;
import com.kaltura.client.types.APIException;
import com.kaltura.client.types.ObjectBase;
import com.kaltura.client.types.ListResponse;
import com.kaltura.client.utils.response.OnCompletion;
import com.kaltura.client.utils.response.base.Response;


/**
 * Created by tehilarozin on 14/08/2016.
 */

public abstract class RequestBuilder extends BaseRequestBuilder {

	protected String id;
	protected String service;
	protected String action;

    public RequestBuilder(Class type, String service, String action) {
        super(type);
        this.service = service;
        this.action = action;
    }

    public static class Tokenizer implements InvocationHandler {
    	private String prefix;

    	public Tokenizer(String prefix) {
    		this.prefix = prefix;
    	}

		@Override
		public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
			String token = prefix + ":" + method.getName();

			if(method.getReturnType().isInterface()) {
				return getTokenizer(method.getReturnType(), token);
			}
			else if(ListTokenizer.class.isAssignableFrom(method.getReturnType())) {
				ParameterizedType genericReturnType = (ParameterizedType) method.getGenericReturnType();
				Class intrface = (Class) genericReturnType.getActualTypeArguments()[0];
				return ListTokenizer.newInstance(intrface, token);
			}
			else if(MapTokenizer.class.isAssignableFrom(method.getReturnType())) {
				ParameterizedType genericReturnType = (ParameterizedType) method.getGenericReturnType();
				Class intrface = (Class) genericReturnType.getActualTypeArguments()[0];
				return MapTokenizer.newInstance(intrface, token);
			}
			else {
				return "{" + token + "}";
			}
		}
    }

    public static class ListResponseTokenizer implements ListResponse.Tokenizer {
    	private Class intrface;
    	private String prefix;

    	public ListResponseTokenizer(Class intrface, String prefix) {
    		this.intrface = intrface;
    		this.prefix = prefix;
    	}

		public String totalCount() {
			return "{" + prefix + ":totalCount}";
		}

		public ListTokenizer objects() {
			return ListTokenizer.newInstance(intrface, prefix + ":objects");
		}
    }

    public static class ListTokenizer {
    	private Class intrface;
    	private String prefix;

    	public static  ListTokenizer newInstance(Class intrface, String prefix) {
    		return new ListTokenizer(intrface, prefix);
    	}

    	public ListTokenizer(Class intrface, String prefix) {
    		this.intrface = intrface;
    		this.prefix = prefix;
    	}

		public I get(int index) {
			return getTokenizer(intrface, prefix + ":" + index);
		}
    }

    public static class MapTokenizer {
    	private Class intrface;
    	private String prefix;

    	public static  MapTokenizer newInstance(Class intrface, String prefix) {
    		return new MapTokenizer(intrface, prefix);
    	}

    	public MapTokenizer(Class intrface, String prefix) {
    		this.intrface = intrface;
    		this.prefix = prefix;
    	}

		public I get(String key) {
			return getTokenizer(intrface, prefix + ":" + key);
		}

		public  J get(String key, Class tokenizerInterface) {
			return getTokenizer(tokenizerInterface, prefix + ":" + key);
		}
    }

    @SuppressWarnings("unchecked")
    static protected  I getTokenizer(Class intrface, String prefix) {
    	Class[] parentInterfaces = intrface.getInterfaces();
    	Class[] interfaces = new Class[parentInterfaces.length + 1];
    	for(int i = 0; i <  parentInterfaces.length; i++) {
    		interfaces[i] = parentInterfaces[i];
    	}
    	interfaces[parentInterfaces.length] = intrface;
        return (I) Proxy.newProxyInstance(intrface.getClassLoader(), interfaces, new Tokenizer(prefix));
    }

    @SuppressWarnings("unchecked")
	public TK getTokenizer() throws APIException {
		if(id == null) {
			throw new APIException(APIException.FailureStep.OnRequest, "Request is not part of multi-request");
		}

    	if(ObjectBase.class.isAssignableFrom(type)) {
        	MultiRequestBuilder.Tokenizer annotation = type.getAnnotation(MultiRequestBuilder.Tokenizer.class);
        	Class[] parentInterfaces = annotation.value().getInterfaces();
        	Class[] interfaces = new Class[parentInterfaces.length + 1];
        	for(int i = 0; i <  parentInterfaces.length; i++) {
        		interfaces[i] = parentInterfaces[i];
        	}
        	interfaces[parentInterfaces.length] = annotation.value();
            return (TK) Proxy.newProxyInstance(type.getClassLoader(), interfaces, new Tokenizer(id + ":result"));
    	}
    	else {
    		return (TK) ("{" + id + ":result}");
    	}
    }

    public MultiRequestBuilder add(RequestBuilder another) {
        try {
            return new MultiRequestBuilder(this, another);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return new MultiRequestBuilder();
    }

    protected String getAction() {
        return action;
    }

    protected Params getParams() {
        return params;
    }

    protected String getService() {
        return service;
    }

    protected String getUrlTail() {
        StringBuilder urlBuilder = new StringBuilder("service/").append(service);
        if (!action.equals("")) {
            urlBuilder.append("/action/").append(action);
        }

        return urlBuilder.toString();
    }

    @SuppressWarnings("unchecked")
	protected S link(String destKey, String requestId, String sourceKey) {
        params.link(destKey, requestId, sourceKey);
        return (S)this;
    }

    @SuppressWarnings("unchecked")
	protected S setId(String id) {
        this.id = id;
        return (S)this;
    }

    protected String getId() {
        return id;
    }

    @SuppressWarnings("unchecked")
	public S setCompletion(OnCompletion> onCompletion) {
        this.onCompletion = onCompletion;
        return (S)this;
    }

    @Override
    public String getTag() {
        return action;
    }
}