Android Open Source - longhorn Back Stack

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 Santiago Valdarrama
 * /*ww  w  .j  ava 2s.co  m*/
 * 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.svpino.longhorn.artifacts.back;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.os.Parcelable;

public class BackStack {
  public final static int BACK_STACK_STOCK_OVERVIEW = -1;

  private List<Parcelable> backStack;

  public BackStack(Bundle savedInstanceState) {
    this.backStack = new ArrayList<Parcelable>();

    if (savedInstanceState != null && savedInstanceState.containsKey("backStack")) {
      Parcelable[] stack = savedInstanceState.getParcelableArray("backStack");

      for (int i = 0; i < stack.length; i++) {
        this.backStack.add(stack[i]);
      }
    }
  }

  public void saveState(Bundle outState) {
    Parcelable[] stack = new Parcelable[this.backStack.size()];
    for (int i = 0; i < this.backStack.size(); i++) {
      stack[i] = this.backStack.get(i);
    }

    outState.putParcelableArray("backStack", stack);
  }

  public int size() {
    return this.backStack.size();
  }

  public Parcelable removeLastItem() {
    return this.backStack.remove(this.backStack.size() - 1);
  }

  public void add(Parcelable parcelable) {
    if (parcelable instanceof StockOverviewBackStackItem) {
      int stock = ((StockOverviewBackStackItem) parcelable).getStock();
      StockOverviewBackStackItem lastStockOverviewAddedToBackStack = getLastStockOverviewAddedToBackStack();
      int lastStockAddedToBackStack = lastStockOverviewAddedToBackStack == null
        ? Integer.MAX_VALUE
        : lastStockOverviewAddedToBackStack.getStock();

      if (stock != lastStockAddedToBackStack) {
        this.backStack.add(parcelable);
      }
    }
  }

  public int getStockOverviewItemCount() {
    int count = 0;
    for (int i = 0; i < this.backStack.size(); i++) {
      if (this.backStack.get(i) instanceof StockOverviewBackStackItem) {
        count++;
      }
    }

    return count;
  }

  public void removeAllStockOverviewItems() {
    int index = 0;
    while (index < this.backStack.size()) {
      if (this.backStack.get(index) instanceof StockOverviewBackStackItem) {
        this.backStack.remove(index);
      }
      else {
        index++;
      }
    }
  }

  public Parcelable getLastItem() {
    return this.backStack.get(this.backStack.size() - 1);
  }

  public StockOverviewBackStackItem getLastStockOverviewAddedToBackStack() {
    for (int i = this.backStack.size() - 1; i >= 0; i--) {
      if (this.backStack.get(i) instanceof StockOverviewBackStackItem) {
        return (StockOverviewBackStackItem) this.backStack.get(i);
      }
    }

    return null;
  }
}

Java Source Code List

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