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/*
* Copyright (C) 2013 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.android.ide.eclipse.adt.internal.wizards.templates;
import com.android.utils.SdkUtils;
import freemarker.template.SimpleScalar;
import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import java.io.IOException;
import java.io.StringWriter;
import java.util.List;
import java.util.Properties;
/** Escapes a property value (such that its syntax is valid in a Java properties file */
public class FmEscapePropertyValueMethod implements TemplateMethodModel {
@Override
public TemplateModel exec(List args) throws TemplateModelException {
if (args.size() != 1) {
throw new TemplateModelException("Wrong arguments");
}
// Slow, stupid implementation, but is 100% compatible with Java's property file implementation
Properties properties = new Properties();
String value = args.get(0).toString();
properties.setProperty("k", value); // key doesn't matter
StringWriter writer = new StringWriter();
String escaped;
try {
properties.store(writer, null);
String s = writer.toString();
int end = s.length();
// Writer inserts trailing newline
String lineSeparator = SdkUtils.getLineSeparator();
if (s.endsWith(lineSeparator)) {
end -= lineSeparator.length();
}
int start = s.indexOf('=');
assert start != -1 : s;
escaped = s.substring(start + 1, end);
}
catch (IOException e) {
escaped = value; // shouldn't happen; we're not going to disk
}
return new SimpleScalar(escaped);
}
}
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