Moxkiriya7/src/com/wiki/standalone/moxkiriya/WikiHistory.java

   1 /**
   2  * Moxkiriya standalone Wiki.
   3  * WikiHistory.
   4  *
   5  * @author Ryuhei Terada
   6  * See the '<a href="{@docRoot}/copyright.html">Copyright</a>'
   7  */
   8 package com.wiki.standalone.moxkiriya;
   9
  10 import java.util.ArrayList;
  11
  12 import javax.jcr.Property;
  13
  14 /**
  15  * Manage wiki history.
  16  *
  17  *
  18  */
  19 public class WikiHistory {
  20         /** History list*/
  21         private ArrayList<PageData> histories_ = new ArrayList<PageData>();
  22
  23         /** Position on history list. */
  24         private int position_ = 0;
  25
  26         /**
  27          * Constructor.
  28          */
  29         public WikiHistory() {
  30                 histories_.clear();
  31         }
  32
  33         /**
  34          * Is there an older node on a history list.
  35          * @return boolean
  36          */
  37         public boolean canBack() {
  38                 boolean canBack = false;
  39
  40                 if(histories_.size() > 1) {
  41                         if(position_ > 0) {
  42                                 canBack = true;
  43                         }
  44                 }
  45
  46                 return canBack;
  47         }
  48
  49         /**
  50          * Is there an newer node on a history list.
  51          * @return boolean
  52          */
  53         public boolean canForward() {
  54                 boolean canForward = false;
  55
  56                 if(histories_.size() > 0) {
  57                         if(position_ < histories_.size() - 1) {
  58                                 canForward = true;
  59                         }
  60                 }
  61
  62                 return canForward;
  63         }
  64
  65         /**
  66          * Execute history back.
  67          * @return PageData
  68          */
  69         public PageData back() {
  70                 PageData pageData = null;
  71
  72                 if(canBack() == true) {
  73                         position_--;
  74                         pageData = histories_.get(position_);
  75                 }
  76
  77                 return pageData;
  78         }
  79
  80         /**
  81          * Execute history forward.
  82          * @return PageData
  83          */
  84         public PageData forward() {
  85                 PageData pageData = null;
  86
  87                 if(canForward() == true) {
  88                         position_++;
  89                         pageData = histories_.get(position_);
  90                 }
  91
  92                 return pageData;
  93         }
  94
  95         /**
  96          * Add PageData to history list.
  97          * @param pageData
  98          * @throws Exception
  99          */
 100         public void add(PageData pageData) throws Exception {
 101                 if(histories_.size() > 0) {
 102                         PageData latestPage = histories_.get(position_);
 103                         String   uuid       = latestPage.getNode().getProperty(Property.JCR_UUID).getString();
 104
 105                         if(pageData.getNode().getProperty(Property.JCR_UUID).getString().equals(uuid) == true) {
 106                                 /*
 107                                  * History中に同じページを連続登録しようとした場合、
 108                                  */
 109                                 histories_.remove(position_);
 110                         }
 111                         else {
 112                                 position_++;
 113                         }
 114                 }
 115
 116                 for(int count = position_; count < histories_.size(); count++) {
 117                         histories_.remove(count);
 118                 }
 119
 120                 histories_.add(pageData);
 121                 position_ = histories_.size() - 1;
 122         }
 123
 124         /**
 125          * Clear history.
 126          */
 127         public void clear() {
 128                 histories_.clear();
 129                 position_ = 0;
 130         }
 131 }