chrome/android/java/src/org/chromium/chrome/browser/FrozenNativePage.java

// Copyright 2014 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.chrome.browser;

import android.view.View;

/**
 * A empty stand-in for a native page. An inactive NativePage may be replaced with a
 * FrozenNativePage to free up resources.
 *
 * Any method may be called on this object, except for getView(), which will trigger an assert and
 * return null.
 */
public class FrozenNativePage implements NativePage {
    private final String mUrl;
    private final String mHost;
    private final String mTitle;
    private final int mBackgroundColor;

    /**
     * Creates a FrozenNativePage to replace the given NativePage and destroys the NativePage.
     */
    public static FrozenNativePage freeze(NativePage nativePage) {
        FrozenNativePage fnp = new FrozenNativePage(nativePage);
        nativePage.destroy();
        return fnp;
    }

    private FrozenNativePage(NativePage nativePage) {
        mHost = nativePage.getHost();
        mUrl = nativePage.getUrl();
        mTitle = nativePage.getTitle();
        mBackgroundColor = nativePage.getBackgroundColor();
    }

    @Override
    public View getView() {
        assert false;
        return null;
    }

    @Override
    public String getTitle() {
        return mTitle;
    }

    @Override
    public String getUrl() {
        return mUrl;
    }

    @Override
    public String getHost() {
        return mHost;
    }

    @Override
    public int getBackgroundColor() {
        return mBackgroundColor;
    }

    @Override
    public void updateForUrl(String url) {
    }

    @Override
    public void destroy() {
    }
}