org.fs.core.AbstractPagerAdapter.java Source code

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Here is the source code for org.fs.core.AbstractPagerAdapter.java

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/*
 * MVP Android Copyright (C) 2016 Fatih.
 *
 * 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 org.fs.core;

import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.util.Log;
import java.io.PrintWriter;
import java.io.StringWriter;
import org.fs.util.ObservableList;
import org.fs.util.PropertyChangedListener;

public abstract class AbstractPagerAdapter<D> extends FragmentPagerAdapter implements PropertyChangedListener {

    protected final ObservableList<D> dataSet;

    public AbstractPagerAdapter(FragmentManager fragmentManager, @NonNull ObservableList<D> dataSet) {
        super(fragmentManager);
        this.dataSet = dataSet;
    }

    protected abstract String getClassTag();

    protected abstract boolean isLogEnabled();

    protected abstract Fragment bind(int position, D element);

    protected final void log(final String str) {
        log(Log.DEBUG, str);
    }

    @Override
    public final Fragment getItem(int position) {
        return bind(position, getItemAtIndex(position));
    }

    protected void log(Throwable error) {
        StringWriter stringWriter = new StringWriter();
        PrintWriter printWriter = new PrintWriter(stringWriter);
        error.printStackTrace(printWriter);
        log(Log.ERROR, stringWriter.toString());
    }

    protected final void log(final int lv, final String str) {
        if (isLogEnabled()) {
            Log.println(lv, getClassTag(), str);
        }
    }

    @Override
    public final int getCount() {
        return dataSet.size();
    }

    protected final D getItemAtIndex(int index) {
        int limit = dataSet.size();
        if (index < 0 || index >= limit)
            return null;
        return dataSet.get(index);
    }

    public final void register() {
        dataSet.registerPropertyChangedListener(this);
    }

    public final void unregister() {
        dataSet.unregisterPropertyChangedListener(this);
    }

    @Override
    public void notifyItemsRemoved(int index, int size) {
        notifyDataSetChanged();
    }

    @Override
    public void notifyItemsChanged(int index, int size) {
        notifyDataSetChanged();
    }

    @Override
    public void notifyItemsInserted(int index, int size) {
        notifyDataSetChanged();
    }
}