net.codestory.http.templating.helpers.EachValueHelperSource.java Source code

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Here is the source code for net.codestory.http.templating.helpers.EachValueHelperSource.java

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/**
 * Copyright (C) 2013 all@code-story.net
 *
 * 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 net.codestory.http.templating.helpers;

import java.io.*;
import java.util.*;

import org.apache.commons.lang3.*;

import com.github.jknack.handlebars.*;

public class EachValueHelperSource {
    public CharSequence each_value(Object context, Options options) throws IOException {
        if (context == null) {
            return StringUtils.EMPTY;
        }

        Object param = options.param(0);

        return (param instanceof Iterable<?>) ? iterableContext(context, (Iterable<?>) param, options)
                : hashContext(context, param, options);
    }

    private CharSequence hashContext(Object context, Object param, Options options) throws IOException {
        StringBuilder buffer = new StringBuilder();

        Set<Map.Entry<String, Object>> keys = options.propertySet(param);

        Context parent = options.context;
        for (Map.Entry<String, Object> key : keys) {
            Context current = Context.newContext(parent, options.wrap(context).get(key.getKey()))
                    .data("value", key.getValue()).data("key", key.getKey());
            buffer.append(options.fn(current));
        }

        return buffer;
    }

    private CharSequence iterableContext(Object context, Iterable<?> keys, Options options) throws IOException {
        StringBuilder buffer = new StringBuilder();

        Context parent = options.context;
        for (Object key : keys) {
            Context current = Context.newContext(parent, options.wrap(context).get(key.toString())).data("key",
                    key);
            buffer.append(options.fn(current));
        }

        return buffer;
    }
}