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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.wizards.templates;
import static com.android.tools.lint.detector.api.LintUtils.assertionsEnabled;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.ide.eclipse.adt.AdtPlugin;
import freemarker.cache.TemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;
/**
* A template handler which can evaluate simple strings. Used to evaluate
* parameter constraints during UI wizard value editing.
* <p>
* Unlike the more general {@link TemplateHandler} which is used to instantiate
* full template files (from resources, merging into existing files etc) this
* evaluator supports only simple strings, referencing only values from the
* provided map (and builtin functions).
*/
class StringEvaluator implements TemplateLoader {
private Map<String, Object> mParameters;
private Configuration mFreemarker;
private String mCurrentExpression;
StringEvaluator() {
mParameters = TemplateHandler.createBuiltinMap();
mFreemarker = new Configuration();
mFreemarker.setObjectWrapper(new DefaultObjectWrapper());
mFreemarker.setTemplateLoader(this);
}
/** Evaluates the given expression, with the given set of parameters */
@Nullable
String evaluate(@NonNull String expression, @NonNull List<Parameter> parameters) {
// Render the instruction list template.
for (Parameter parameter : parameters) {
mParameters.put(parameter.id, parameter.value);
}
try {
mCurrentExpression = expression;
Template inputsTemplate = mFreemarker.getTemplate(expression);
StringWriter out = new StringWriter();
inputsTemplate.process(mParameters, out);
out.flush();
return out.toString();
} catch (Exception e) {
if (assertionsEnabled()) {
AdtPlugin.log(e, null);
}
return null;
}
}
// ---- Implements TemplateLoader ----
@Override
public Object findTemplateSource(String name) throws IOException {
return mCurrentExpression;
}
@Override
public long getLastModified(Object templateSource) {
return 0;
}
@Override
public Reader getReader(Object templateSource, String encoding) throws IOException {
return new StringReader(mCurrentExpression);
}
@Override
public void closeTemplateSource(Object templateSource) throws IOException {
}
}
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