/*
* (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
*
* 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.
*
* Contributors:
* bstefanescu
*/
package org.nuxeo.ecm.automation.core.scripting;
import org.mvel2.compiler.BlankLiteral;
import org.mvel2.templates.CompiledTemplate;
import org.mvel2.templates.TemplateCompiler;
import org.mvel2.templates.TemplateRuntime;
import org.nuxeo.ecm.automation.OperationContext;
/**
* @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
*/
public class MvelTemplate implements Expression {
private static final long serialVersionUID = 1L;
protected transient volatile CompiledTemplate compiled;
protected final String expr;
public MvelTemplate(String expr) {
this.expr = expr;
}
@Override
public Object eval(OperationContext ctx) {
if (compiled == null) {
compiled = TemplateCompiler.compileTemplate(expr);
}
Object obj = TemplateRuntime.execute(compiled, Scripting.initBindings(ctx));
return obj == null || obj.getClass().isAssignableFrom(BlankLiteral.class) ? "" : obj.toString();
}
@Override
public String getExpr() {
return expr;
}
}