com.mitchellbosecke.pebble.node.expression.BlockFunctionExpression Maven / Gradle / Ivy

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Templating engine for Java.

There is a newer version: 2.4.0

/*******************************************************************************
 * This file is part of Pebble.
 *
 * Copyright (c) 2014 by Mitchell Bösecke
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 ******************************************************************************/
package com.mitchellbosecke.pebble.node.expression;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;

import com.mitchellbosecke.pebble.error.PebbleException;
import com.mitchellbosecke.pebble.extension.NodeVisitor;
import com.mitchellbosecke.pebble.node.ArgumentsNode;
import com.mitchellbosecke.pebble.template.EvaluationContext;
import com.mitchellbosecke.pebble.template.PebbleTemplateImpl;

public class BlockFunctionExpression implements Expression {

    private final Expression blockNameExpression;

    private final int lineNumber;

    public BlockFunctionExpression(ArgumentsNode args, int lineNumber) {
        this.blockNameExpression = args.getPositionalArgs().get(0).getValueExpression();
        this.lineNumber = lineNumber;
    }

    @Override
    public String evaluate(PebbleTemplateImpl self, EvaluationContext context) throws PebbleException {
        Writer writer = new StringWriter();
        String blockName = (String) blockNameExpression.evaluate(self, context);
        try {
            self.block(writer, context, blockName, false);
        } catch (IOException e) {
            throw new PebbleException(e, "Could not render block [" + blockName + "]", this.getLineNumber(), self.getName());
        }
        return writer.toString();
    }

    @Override
    public void accept(NodeVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public int getLineNumber() {
        return this.lineNumber;
    }

}