/**
* Notifies all views of a context change.
*
* @param nodes new context set (may be {@code null} if root nodes are addressed)
* @param quick quick switch
* @param vw the calling view
*/
public void context(final Nodes nodes, final boolean quick, final View vw) {
final Context ctx = gui.context;
// add new entry if current node set has not been cached yet
final Nodes newn = nodes.checkRoot();
final Nodes empty = new Nodes(new int[0], ctx.data(), ctx.marked.ftpos);
final Nodes curr = quick ? ctx.current() : null;
final Nodes cmp = quick ? curr : ctx.marked;
if (cont[hist] == null ? cmp != null : cmp == null || !cont[hist].sameAs(cmp)) {
checkHist();
if (quick) {
// store history entry
queries[hist] = "";
marked[hist] = new Nodes(ctx.data());
// add current entry
cont[++hist] = curr;
} else {
// store history entry
final String in = gui.input.getText();
queries[hist] = in;
marked[hist] = ctx.marked;
// add current entry
cont[++hist] = newn;
queries[hist] = in;
marked[hist] = empty;
}
histsize = hist;
}
ctx.set(newn, empty);
for (final View v : view) if (v != vw && v.visible()) v.refreshContext(true, quick);
gui.refreshControls();
}
@Override
public void execute(final GUI gui) {
final boolean rt = gui.gprop.invert(GUIProp.FILTERRT);
gui.stop();
// refresh buttons in input bar
gui.refreshControls();
// refresh editor buttons
gui.editor.refreshMark();
final Context ctx = gui.context;
final boolean root = ctx.root();
final Data data = ctx.data();
if (!rt) {
if (!root) {
gui.notify.context(new Nodes(0, data), true, null);
gui.notify.mark(ctx.current(), null);
}
} else {
if (root) {
gui.notify.mark(new Nodes(data), null);
} else {
final Nodes mark = ctx.marked;
ctx.marked = new Nodes(data);
gui.notify.context(mark, true, null);
}
}
}
@Override
public void execute(final GUI gui) {
final Context ctx = gui.context;
Nodes marked = ctx.marked;
if (marked.size() == 0) {
final int pre = gui.context.focused;
if (pre == -1) return;
marked = new Nodes(pre, ctx.data());
}
gui.notify.context(marked, false, null);
}
/**
* Notifies all views of a selection change. The mode flag determines what happens:
*
* <ul>
* <li>0: set currently focused node as marked node
* <li>1: add currently focused node
* <li>2: toggle currently focused node
* </ul>
*
* @param mode mark mode
* @param vw the calling view
*/
public void mark(final int mode, final View vw) {
final int f = gui.context.focused;
if (f == -1) return;
final Context ctx = gui.context;
Nodes nodes = ctx.marked;
if (mode == 0) {
nodes = new Nodes(f, ctx.data());
} else if (mode == 1) {
nodes.union(new int[] {f});
} else {
nodes.toggle(f);
}
mark(nodes, vw);
}
/**
* Removes existing history entries and sets an initial entry.
*
* @param ctx database context
* @return {@link Data} reference, or {@code null}
*/
private Data initHistory(final Context ctx) {
for (int h = 0; h < histsize; h++) {
marked[h] = null;
cont[h] = null;
queries[h] = null;
}
hist = 0;
histsize = 0;
final Data data = ctx.data();
if (data != null) {
// new database opened
marked[0] = new Nodes(data);
queries[0] = "";
}
return data;
}
@Override
public void execute(final GUI gui) {
// skip operation for root context
final Context ctx = gui.context;
if (ctx.root()) return;
// check if all nodes are document nodes
boolean doc = true;
final Data data = ctx.data();
for (final int pre : ctx.current().pres) doc &= data.kind(pre) == Data.DOC;
if (doc) {
// if yes, jump to database root
ctx.update();
gui.notify.context(ctx.current(), false, null);
} else {
// otherwise, jump to parent nodes
gui.execute(new Cs(".."));
}
}
/**
* Executes the command, prints the result to the specified output stream and returns a success
* flag.
*
* @param ctx database context
* @param os output stream
* @return success flag. The {@link #info()} method returns information on a potential exception
*/
private boolean exec(final Context ctx, final OutputStream os) {
// check if data reference is available
final Data dt = ctx.data();
if (dt == null && data) return error(NO_DB_OPENED);
// check permissions
if (!ctx.perm(perm, dt != null ? dt.meta : null)) return error(PERM_REQUIRED_X, perm);
// set updating flag
updating = updating(ctx);
try {
// register process
ctx.register(this);
// run command and return success flag
return run(ctx, os);
} finally {
// guarantee that process will be unregistered
ctx.unregister(this);
}
}
/**
* Closes the specified database if it is currently opened and only pinned once.
*
* @param ctx database context
* @param db database to be closed
* @return closed flag
*/
protected static boolean close(final Context ctx, final String db) {
final boolean close =
ctx.data() != null && db.equals(ctx.data().meta.name) && ctx.dbs.pins(db) == 1;
return close && new Close().run(ctx);
}