com.momock.holder.FragmentManagerHolder.java Source code

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Here is the source code for com.momock.holder.FragmentManagerHolder.java

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/*******************************************************************************
 * Copyright 2012 momock.com
 * 
 * Licensed 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 com.momock.holder;

import java.lang.ref.WeakReference;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;

import com.momock.app.ICase;

public abstract class FragmentManagerHolder {
    public abstract FragmentManager getFragmentManager();

    public static FragmentManagerHolder get(FragmentActivity activity) {
        final WeakReference<FragmentActivity> refActivity = new WeakReference<FragmentActivity>(activity);
        return new FragmentManagerHolder() {

            @Override
            public FragmentManager getFragmentManager() {
                return refActivity.get().getSupportFragmentManager();
            }

        };
    }

    public static FragmentManagerHolder get(final Fragment fragment) {
        return new FragmentManagerHolder() {

            @Override
            public FragmentManager getFragmentManager() {
                FragmentManager fm = fragment.getFragmentManager();
                if (fm == null && fragment.getActivity() != null)
                    fm = fragment.getActivity().getSupportFragmentManager();
                return fm;
            }

        };
    }

    public static FragmentManagerHolder get(final ICase<?> kase) {
        return new FragmentManagerHolder() {

            @Override
            public FragmentManager getFragmentManager() {
                FragmentManager fm = null;
                ICase<?> current = kase;
                while (current != null && fm == null) {
                    if (current.getAttachedObject() instanceof FragmentActivity)
                        fm = ((FragmentActivity) current.getAttachedObject()).getSupportFragmentManager();
                    else if (current.getAttachedObject() instanceof Fragment) {
                        Fragment fragment = (Fragment) current.getAttachedObject();
                        fm = fragment.getFragmentManager();
                        if (fm == null && fragment.getActivity() != null)
                            fm = fragment.getActivity().getSupportFragmentManager();
                    }
                    current = current.getParent();
                }
                return fm;
            }

        };
    }
}