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    • com.github.jknack.handlebars.helper.LookupHelper Maven / Gradle / Ivy

    There is a newer version: 2024.11.18751.20241128T090041Z-241100
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    /**
 * Copyright (c) 2012-2015 Edgar Espina
 *
 * This file is part of Handlebars.java.
 *
 * 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.github.jknack.handlebars.helper;

import java.io.IOException;
import com.github.jknack.handlebars.Context;
import com.github.jknack.handlebars.Helper;
import com.github.jknack.handlebars.Options;

/**
 *  Lookup helper, which allows to get a context variable.
 *
 *  It was introduced with dynamic partials:
 *
 *  
     *  {{> (lookup '.' 'myVariable') }}
 *  
    
 *
 *  @author edgar
 *  @since 2.2.0
 *
 * @deprecated com.github.jknack.handlebars.helper package is deprecated and marked for removal in subsequent releases which will involve removal of the handlebars dependency in AEM.
 */
@Deprecated(since = "2024-07-10")
public class LookupHelper implements Helper {

    /**
     * A singleton instance of this helper.
     */
    public static final Helper INSTANCE = new LookupHelper();

    /**
     * The helper's name.
     */
    public static final String NAME = "lookup";

    @Override
    public Object apply(final Object context, final Options options) throws IOException {
        if (context == null) {
            return null;
        }
        if (options.params.length <= 0) {
            return context;
        }
        Context ctx = Context.newBuilder(options.context, context).build();
        Object lookup = ctx.get(options.param(0).toString());
        if (lookup == null) {
            return context;
        }
        return lookup;
    }
}
    
    
    
    

    




    
    
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