VelocityTemplates.java

package comeon.templates.velocity;

import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.log.Log4JLogChute;

import java.util.Map;
import java.util.Properties;

public final class VelocityTemplates {
    private static final VelocityTemplates INSTANCE = new VelocityTemplates();

    final Properties commonProps;

    private VelocityTemplates() {
        commonProps = new Properties();
        commonProps.put(RuntimeConstants.INPUT_ENCODING, "UTF-8");
        commonProps.put(RuntimeConstants.OUTPUT_ENCODING, "UTF-8");
        commonProps.put(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS, Log4JLogChute.class.getName());
        commonProps.put("runtime.log.logsystem.log4j.logger", "org.apache.velocity");
    }

    public static VelocityTemplates getInstance() {
        return INSTANCE;
    }

    public VelocityEngine getEngine(final Map<String, String> additionalProps) {
        final VelocityEngine engine = new VelocityEngine();
        final Properties engineProps = new Properties(commonProps);
        engineProps.putAll(additionalProps);
        engine.init(engineProps);
        return engine;
    }
}