root/content/public/android/java/src/org/chromium/content/browser/framehost/NavigationControllerImpl.java

DEFINITIONS

1. JNINamespace
2. create
3. destroy
4. canGoBack
5. canGoForward
6. canGoToOffset
7. goToOffset
8. goToNavigationIndex
9. goBack
10. goForward
11. nativeCanGoBack
12. nativeCanGoForward
13. nativeCanGoToOffset
14. nativeGoBack
15. nativeGoForward
16. nativeGoToOffset
17. nativeGoToNavigationIndex

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.content.browser.framehost;

import org.chromium.base.CalledByNative;
import org.chromium.base.JNINamespace;
import org.chromium.content_public.browser.NavigationController;

/**
 * The NavigationControllerImpl Java wrapper to allow communicating with the native
 * NavigationControllerImpl object.
 */
@JNINamespace("content")
// TODO(tedchoc): Remove the package restriction once this class moves to a non-public content
//                package whose visibility will be enforced via DEPS.
/* package */ class NavigationControllerImpl implements NavigationController {

    private long mNativeNavigationControllerAndroid;

    private NavigationControllerImpl(long nativeNavigationControllerAndroid) {
        mNativeNavigationControllerAndroid = nativeNavigationControllerAndroid;
    }

    @CalledByNative
    private static NavigationControllerImpl create(long nativeNavigationControllerAndroid) {
        return new NavigationControllerImpl(nativeNavigationControllerAndroid);
    }

    @CalledByNative
    private void destroy() {
        mNativeNavigationControllerAndroid = 0;
    }

    @Override
    public boolean canGoBack() {
        return mNativeNavigationControllerAndroid != 0
                && nativeCanGoBack(mNativeNavigationControllerAndroid);
    }

    @Override
    public boolean canGoForward() {
        return mNativeNavigationControllerAndroid != 0
                && nativeCanGoForward(mNativeNavigationControllerAndroid);
    }

    @Override
    public boolean canGoToOffset(int offset) {
        return mNativeNavigationControllerAndroid != 0
                && nativeCanGoToOffset(mNativeNavigationControllerAndroid, offset);
    }

    @Override
    public void goToOffset(int offset) {
        if (mNativeNavigationControllerAndroid != 0) {
            nativeGoToOffset(mNativeNavigationControllerAndroid, offset);
        }
    }

    @Override
    public void goToNavigationIndex(int index) {
        if (mNativeNavigationControllerAndroid != 0) {
            nativeGoToNavigationIndex(mNativeNavigationControllerAndroid, index);
        }
    }

    @Override
    public void goBack() {
        if (mNativeNavigationControllerAndroid != 0) {
            nativeGoBack(mNativeNavigationControllerAndroid);
        }
    }

    @Override
    public void goForward() {
        if (mNativeNavigationControllerAndroid != 0) {
            nativeGoForward(mNativeNavigationControllerAndroid);
        }
    }

    private native boolean nativeCanGoBack(long nativeNavigationControllerAndroid);
    private native boolean nativeCanGoForward(long nativeNavigationControllerAndroid);
    private native boolean nativeCanGoToOffset(
            long nativeNavigationControllerAndroid, int offset);
    private native void nativeGoBack(long nativeNavigationControllerAndroid);
    private native void nativeGoForward(long nativeNavigationControllerAndroid);
    private native void nativeGoToOffset(long nativeNavigationControllerAndroid, int offset);
    private native void nativeGoToNavigationIndex(
            long nativeNavigationControllerAndroid, int index);
}