src/main/java/org/apache/sling/scripting/sightly/impl/utils/BindingsUtils.java

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 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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,
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 * See the License for the specific language governing permissions and
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package org.apache.sling.scripting.sightly.impl.utils;

import javax.script.Bindings;
import javax.script.SimpleBindings;

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.scripting.SlingScriptHelper;

/**
 * {@code BindingsUtils} provides helper methods for retrieving commonly used objects from a {@link javax.script.Bindings} map.
 */
public class BindingsUtils {

    /**
     * Retrieves the {@link Resource} from a {@link Bindings} map.
     *
     * @param bindings the bindings map
     * @return the {@link Resource} if found, {@code null} otherwise
     */
    public static Resource getResource(Bindings bindings) {
        return (Resource) bindings.get(SlingBindings.RESOURCE);
    }

    /**
     * Retrieves the {@link SlingHttpServletRequest} from a {@link Bindings} map.
     *
     * @param bindings the bindings maps
     * @return the {@link SlingHttpServletRequest} if found, {@code null} otherwise
     */
    public static SlingHttpServletRequest getRequest(Bindings bindings) {
        return (SlingHttpServletRequest) bindings.get(SlingBindings.REQUEST);
    }

    /**
     * Retrieves the {@link SlingHttpServletResponse} from a {@link Bindings} map.
     *
     * @param bindings the bindings maps
     * @return the {@link SlingHttpServletResponse} if found, {@code null} otherwise
     */
    public static SlingHttpServletResponse getResponse(Bindings bindings) {
        return (SlingHttpServletResponse) bindings.get(SlingBindings.RESPONSE);
    }

    /**
     * Retrieves the {@link SlingScriptHelper} from a {@link Bindings} map.
     *
     * @param bindings the bindings map
     * @return the {@link SlingScriptHelper} if found, {@code null} otherwise
     */
    public static SlingScriptHelper getHelper(Bindings bindings) {
        return (SlingScriptHelper) bindings.get(SlingBindings.SLING);
    }


    /**
     * Combine two bindings objects. Priority goes to latter bindings.
     *
     * @param former first map of bindings
     * @param latter second map of bindings, which can override the fist one
     * @return the merging of the two maps
     */
    public static Bindings merge(Bindings former, Bindings latter) {
        Bindings bindings = new SimpleBindings();
        bindings.putAll(former);
        bindings.putAll(latter);
        return bindings;
    }
}