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Typical editors go through an open-modify-save-close lifecycle When the editor is opened, the init(IEditorSite, IEditorInput) method is called to set the editor s initial content When the user modifies the editor s content, the editor must notify others that its content is now dirty by using the firePropertyChange(int) method When a user saves the editor s content, the firePropertyChange(int) method must be used again to notify registered listeners that the editor s content is no longer dirty Eclipse automatically registers listeners to perform various tasks based on the value returned by the isDirty() method, such as updating the editor s title, adding or removing an asterisk preceding the title, and enabling the Save menu Finally, when the editor is closed, the editor s content is saved if the isDirty() method returns true

Effective Java: Programming Language Guide // Repaired accessors - make defensive copies of internal fields public Date start() { return (Date) startclone(); } public Date end() { return (Date) endclone(); }

// error - no element at retend() copy(bottombegin(), bottomend(), retend());

You need to ensure that the editor knows whether its content has been modified by the user since the last save operation To do this, introduce this new field to track whether the current page has been modified relative to the other pages:

private boolean isPageModified;

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This latter mistake is particularly insidious, because the program will compile What it does when you try to run it is another story entirely The first thing copy will try to do is assign a value to the element at retend() There's no element there, so what the implementation will do is anybody's guess Why is copy designed this way Because separating the notions of copying elements and expanding a container allows programmers to choose which operations to use For example, we might want to copy elements on top of elements that already exist in a container, without changing the container's size As another example, which we shall see in 622/112, we might want to use back_inserter to append elements to a container that are not merely copies of another container's elements

Whenever the current page s content has been modified, you need to set the new isPageModified field Whenever the tree is modified, the cell modifier calls the treeModified() method (see Section 831, Cell editors, on page 372), where the new isPageModified field can be set

public void treeModified() { boolean wasDirty = isDirty(); isPageModified = true; if (!wasDirty) firePropertyChange(IEditorPartPROP_DIRTY); }

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Another function that we can write more directly using the standard algorithms is split, which we saw in 56/88 The hard part of writing that function was dealing with the indices that delimited each word in the input line We can replace the indices by iterators, and use standard-library algorithms to do much of the work for us:

Whenever the text editor is modified, the MultiPageEditorPart s addPage() method uses the handlePropertyChange(int) method (see the createSourcePage() method in Section 822, Editor controls, on page 360) to notify others when the editor s content has changed You can override this method to set the isPageModified field as appropriate:

// true if the argument is whitespace, false otherwise bool space(char c) { return isspace(c); } // false if the argument is whitespace, true otherwise bool not_space(char c) { return !isspace(c); } vector<string> split(const string { typedef string::const_iterator iter; vector<string> ret; iter i = strbegin(); while (i != strend()) { // ignore leading blanks i = find_if(i, strend(), not_space); // find end of next word iter j = find_if(i, strend(), space); // copy the characters in [i, j) if (i != strend()) retpush_back(string(i, j)); i = j; } return ret; }

protected void handlePropertyChange (int propertyId) { if (propertyId == IEditorPartPROP_DIRTY) isPageModified = isDirty(); superhandlePropertyChange(propertyId); }

Finally, you need to let other registered listeners know when the editor s content is dirty The MultiPageEditorPart s isDirty() method appropriately returns true for the nested text editor on the Source page, but knows nothing about modifications to the tree Overriding this method to add this knowledge causes the Save menu item to be enabled and the editor s title to be updated at the appropriate time

This code uses a lot of new functions, so it will take a bit of explanation The key idea to keep in mind is that it implements the same algorithm as the original, using i and j to delimit each word in str Once we've found a word, we copy it from str, and push the copy onto the back of ret This time, i and j are iterators, not indices We use typedef to abbreviate the iterator type, so that we can use iter instead of the longer string::const_iterator Although the string type does not support all of the container operations, it does support iterators Therefore, we can use the standard-library algorithms on the characters of a string, just as we can use them on the elements of a vector

public boolean isDirty() { return isPageModified || superisDirty(); }

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