pagination types for item and page wrapper

Author: asadali214

src/main/java/io/apimatic/core/types/pagination/ItemWrapper.java

@@ -0,0 +1,9 @@
+package io.apimatic.core.types.pagination;
+
+import java.io.IOException;
+
+import io.apimatic.core.types.CoreApiException;
+
+public interface ItemWrapper<T, ExceptionType extends CoreApiException> {
+    T get() throws ExceptionType, IOException;
+}

src/main/java/io/apimatic/core/types/pagination/PageWrapper.java

@@ -0,0 +1,154 @@
+package io.apimatic.core.types.pagination;
+
+import java.io.IOException;
+import java.util.List;
+
+import io.apimatic.core.types.CoreApiException;
+import io.apimatic.coreinterfaces.http.HttpHeaders;
+public class PageWrapper<I, P, E extends CoreApiException> {
+    
+    @SuppressWarnings("unchecked")
+    public static <I, P, E extends CoreApiException> PageWrapper<I, P, E> CreateError(
+            Exception exception) {
+        if (exception instanceof CoreApiException) {
+            return new PageWrapper<I, P, E>((E) exception);
+        }
+
+        if (exception instanceof IOException) {
+            return new PageWrapper<I, P, E>((IOException) exception);
+        }
+
+        return null;
+    }
+    
+    private final int statusCode;
+    private final HttpHeaders headers;
+    private P result;
+    private List<I> items;
+    private E apiException = null;
+    private IOException ioException = null;
+    
+    private String nextLinkInput = null;
+    private int offsetInput = -1;
+    private int pageInput = -1;
+    private String cursorInput = null;
+
+    public PageWrapper(int statusCode, HttpHeaders headers, P result, List<I> items) {
+        this.statusCode = statusCode;
+        this.headers = headers;
+        this.result = result;
+        this.items = items;
+    }
+
+    private PageWrapper(E apiException) {
+        this.statusCode = apiException.getResponseCode();
+        this.headers = apiException.getHttpContext().getResponse().getHeaders();
+        this.apiException = apiException;
+    }
+
+    private PageWrapper(IOException ioException) {
+        this.statusCode = 0;
+        this.headers = null;
+        this.ioException = ioException;
+    }
+
+    public void setNextLinkInput(String nextLinkInput) {
+        this.nextLinkInput = nextLinkInput;
+    }
+
+    public void setOffsetInput(int offsetInput) {
+        this.offsetInput = offsetInput;
+    }
+
+    public void setPageInput(int pageInput) {
+        this.pageInput = pageInput;
+    }
+
+    public void setCursorInput(String cursorInput) {
+        this.cursorInput = cursorInput;
+    }
+
+    /**
+     * Gets the next link input used for link-based pagination.
+     * @return The next page link
+     */
+    public String getNextLinkInput() {
+        return nextLinkInput;
+    }
+
+    /**
+     * Gets the offset input used for offset-based pagination.
+     * @return The offset value
+     */
+    public int getOffsetInput() {
+        return offsetInput;
+    }
+
+    /**
+     * Gets the page number input used for page-based pagination.
+     * @return The page number
+     */
+    public int getPageInput() {
+        return pageInput;
+    }
+
+    /**
+     * Gets the cursor input used for cursor-based pagination.
+     * @return The cursor token
+     */
+    public String getCursorInput() {
+        return cursorInput;
+    }
+
+    /**
+     * HTTP Status code of the api response.
+     * @return Int status code
+     */
+    public int getStatusCode() {
+        return statusCode;
+    }
+
+    /**
+     * Headers of the http response.
+     * @return Headers
+     */
+    public HttpHeaders getHeaders() {
+        return headers;
+    }
+
+    /**
+     * Content of the page.
+     * @return List of items on this page.
+     * @throws E
+     * @throws IOException
+     */
+    public List<I> getItems() throws E, IOException {
+        if (ioException != null) {
+            throw ioException;
+        }
+
+        if (apiException != null) {
+            throw apiException;
+        }
+
+        return items;
+    }
+
+    /**
+     * Content of the page.
+     * @return Content
+     * @throws E
+     * @throws IOException
+     */
+    public P getResult() throws E, IOException {
+        if (ioException != null) {
+            throw ioException;
+        }
+
+        if (apiException != null) {
+            throw apiException;
+        }
+
+        return result;
+    }
+}