/*
 * 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, 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 freemarker.core;

import java.io.IOException;

/**
 * An instruction that flushes the output stream.
 */
final class FlushInstruction extends TemplateElement {

    @Override
    TemplateElement[] accept(Environment env) throws IOException {
        env.getOut().flush();
        return null;
    }

    @Override
    protected String dump(boolean canonical) {
        return canonical ? "<" + getNodeTypeSymbol() + "/>" : getNodeTypeSymbol();
    }
    
    @Override
    String getNodeTypeSymbol() {
        return "#flush";
    }
 
    @Override
    int getParameterCount() {
        return 0;
    }

    @Override
    Object getParameterValue(int idx) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    ParameterRole getParameterRole(int idx) {
        throw new IndexOutOfBoundsException();
    }

    @Override
    boolean isNestedBlockRepeater() {
        return false;
    }
    
}