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| package photospace.web; |
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| |
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| import java.util.*; |
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| import javax.servlet.http.*; |
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| import photospace.meta.*; |
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| |
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| public class History |
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| implements java.io.Serializable |
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| { |
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| private List entries = new ArrayList(); |
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| private int length; |
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| |
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0
| public History()
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| { |
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0
| this(4);
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| } |
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| |
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0
| public History(int length)
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| { |
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0
| this.length = length;
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| } |
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| |
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0
| public List getEntries()
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| { |
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0
| return entries;
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| } |
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| |
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0
| public void add(HttpServletRequest request, Meta meta)
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| { |
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0
| Entry entry = new Entry(request, meta);
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0
| if (entries.isEmpty())
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| { |
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| entries.add(entry);
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0
| return;
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| } |
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| if (entry.equals(entries.get(getEnd()))) return;
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| |
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| entries.add(entry);
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| } |
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| |
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0
| public int getStart()
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| { |
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0
| if (entries.size() <= length) return 0;
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0
| return entries.size() - length;
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| } |
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| |
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0
| public int getEnd()
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| { |
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0
| return entries.size() - 1;
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| } |
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| |
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0
| public Entry getLast()
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| { |
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0
| if (entries.isEmpty()) return null;
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0
| return (Entry) entries.get(entries.size() - 1);
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| } |
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| |
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0
| public Entry goTo(int index)
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| { |
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0
| if (entries.isEmpty()) return null;
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61 |
0
| if (entries.size() <= index) return goTo(getEnd());
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| |
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| Entry entry = (Entry) entries.get(index);
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| entries = new ArrayList(entries.subList(0, index + 1));
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0
| return entry;
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| } |
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| |
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| public class Entry |
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| implements java.io.Serializable |
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| { |
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| private String url; |
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| private String label; |
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| |
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| public Entry(HttpServletRequest request, Meta meta)
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| { |
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| this.url = request.getRequestURL().toString();
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| this.label = meta.getLabel();
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| if (request.getQueryString() != null) this.url += "?" + request.getQueryString();
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| } |
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| |
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| public String getLabel()
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| { |
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| return label;
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| } |
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| |
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| public String getUrl()
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| { |
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| return url;
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| } |
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| |
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| public String toString()
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| { |
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| return "Entry[" + label + "=" + url + "]";
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| } |
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| |
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| public boolean equals(Object obj)
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| { |
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0
| if (!(obj instanceof Entry)) return false;
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0
| return url.equals(((Entry) obj).getUrl());
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| } |
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| |
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| public int hashCode()
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| { |
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0
| return url.hashCode();
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| } |
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| } |
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| |
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| } |
