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// Copyright (C) 2009 The Android Open Source Project
//
// 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.google.gwtexpui.safehtml.client;
import com.google.gwt.user.client.ui.SuggestOracle;
import java.util.ArrayList;
/**
* A suggestion oracle that tries to highlight the matched text.
* <p>
* Suggestions supplied by the implementation of
* {@link #onRequestSuggestions(Request, Callback)} are modified to wrap all
* occurrences of the {@link SuggestOracle.Request#getQuery()} substring in HTML
* <code><strong></code> tags, so they can be emphasized to the user.
*/
public abstract class HighlightSuggestOracle extends SuggestOracle {
private static String escape(String ds) {
return new SafeHtmlBuilder().append(ds).asString();
}
@Override
public final boolean isDisplayStringHTML() {
return true;
}
@Override
public final void requestSuggestions(final Request request, final Callback cb) {
onRequestSuggestions(request, new Callback() {
public void onSuggestionsReady(final Request request,
final Response response) {
final String qpat = getQueryPattern(request.getQuery());
final boolean html = isHTML();
final ArrayList<Suggestion> r = new ArrayList<Suggestion>();
for (final Suggestion s : response.getSuggestions()) {
r.add(new BoldSuggestion(qpat, s, html));
}
cb.onSuggestionsReady(request, new Response(r));
}
});
}
protected String getQueryPattern(final String query) {
return "(" + escape(query) + ")";
}
/**
* @return true if {@link SuggestOracle.Suggestion#getDisplayString()} returns
* HTML; false if the text must be escaped before evaluating in an
* HTML like context.
*/
protected boolean isHTML() {
return false;
}
/** Compute the suggestions and return them for display. */
protected abstract void onRequestSuggestions(Request request, Callback done);
private static class BoldSuggestion implements Suggestion {
private final Suggestion suggestion;
private final String displayString;
BoldSuggestion(final String qstr, final Suggestion s, final boolean html) {
suggestion = s;
String ds = s.getDisplayString();
if (!html) {
ds = escape(ds);
}
displayString = sgi(ds, qstr, "<strong>$1</strong>");
}
private static native String sgi(String inString, String pat, String newHtml)
/*-{ return inString.replace(RegExp(pat, 'gi'), newHtml); }-*/;
public String getDisplayString() {
return displayString;
}
public String getReplacementString() {
return suggestion.getReplacementString();
}
}
}
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