com.github.jknack.handlebars.internal.PartialBlockForwardingTemplate Maven / Gradle / Ivy

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Logic-less and semantic templates with Java
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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.internal;

import com.github.jknack.handlebars.Context;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;

import java.io.IOException;
import java.io.Writer;
import java.util.LinkedList;
import java.util.Map;

/**
 *
 */
public class PartialBlockForwardingTemplate extends BaseTemplate {
    /**
     * The block to be passed as partial-block.
     */
    private final Template block;

    /**
     * The previous partial-block definition of the template which contains this partial.
     */
    private final Template parentPartialBlock;

    /**
     * The callee of the parent partial.
     */
    private final Template callee;

    /**
     * Constructs a PartialBlockForwardingTemplate.
     *
     * @param parent the parent partial
     * @param block the block to be passed as partial-block.
     * @param parentPartialBlock the previous partial-block definition of
     *                          the template which contains this partial.
     * @param callee the template that renders the parent
     * @param handlebars handlebars
     */
    public PartialBlockForwardingTemplate(
            final Template parent,
            final Template block,
            final Template parentPartialBlock,
            final Template callee,
            final Handlebars handlebars
    ) {
        super(handlebars);
        this.block = block;
        this.parentPartialBlock = parentPartialBlock;
        this.callee = callee;
        this.filename(parent.filename());
        this.position(parent.position()[0], parent.position()[1]);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void merge(final Context context, final Writer writer) throws IOException {
        LinkedList> partials = context.data(Context.INLINE_PARTIALS);
        Map inlineTemplates = partials.getLast();
        Template oldPartialBlock = inlineTemplates.get("@partial-block");
        Template oldCallee = context.data(Context.CALLEE);

        context.data(Context.CALLEE, callee);
        inlineTemplates.put("@partial-block", parentPartialBlock);
        block.apply(context, writer);
        inlineTemplates.put("@partial-block", oldPartialBlock);
        context.data(Context.CALLEE, oldCallee);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String text() {
        return block.text();
    }
}