/*
* Copyright (C) 2010 Google Inc.
*
* 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.clearsilver.jsilver.interpreter;
import com.google.clearsilver.jsilver.autoescape.EscapeMode;
import com.google.clearsilver.jsilver.resourceloader.ResourceLoader;
import com.google.clearsilver.jsilver.syntax.TemplateSyntaxTree;
import java.util.ArrayList;
import java.util.List;
/**
* Wraps a template factory with a series of optimization steps. Any null optimization steps are
* ignored.
*/
public class OptimizingTemplateFactory implements TemplateFactory {
private final TemplateFactory wrapped;
private final List<OptimizerProvider> optimizers;
/**
* Creates a factory from the given optimization steps that wraps another TemplateFactory.
*
* @param wrapped the template factory instance to be wrapped.
* @param optimizers the optimizers to apply (null optimizations are ignored).
*/
public OptimizingTemplateFactory(TemplateFactory wrapped, OptimizerProvider... optimizers) {
this.wrapped = wrapped;
// Ignore null providers during construction.
this.optimizers = new ArrayList<OptimizerProvider>();
for (OptimizerProvider optimizer : optimizers) {
if (optimizer != null) {
this.optimizers.add(optimizer);
}
}
}
private void optimize(TemplateSyntaxTree ast) {
for (OptimizerProvider optimizer : optimizers) {
ast.apply(optimizer.getOptimizer());
}
}
@Override
public TemplateSyntaxTree createTemp(String content, EscapeMode escapeMode) {
TemplateSyntaxTree result = wrapped.createTemp(content, escapeMode);
optimize(result);
return result;
}
@Override
public TemplateSyntaxTree find(String templateName, ResourceLoader resourceLoader,
EscapeMode escapeMode) {
TemplateSyntaxTree result = wrapped.find(templateName, resourceLoader, escapeMode);
optimize(result);
return result;
}
}