001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.io.output;
018
019import java.io.IOException;
020import java.io.OutputStream;
021
022/**
023 * OutputStream implementation that writes the data to an {@link Appendable}
024 * Object.
025 * <p>
026 * For example, can be used with any {@link java.io.Writer} or a {@link StringBuilder}
027 * or {@link StringBuffer}.
028 * </p>
029 *
030 * @since 2.5
031 * @see Appendable
032 *
033 * @param <T> The type of the {@link Appendable} wrapped by this AppendableOutputStream.
034 */
035public class AppendableOutputStream <T extends Appendable> extends OutputStream {
036
037    private final T appendable;
038
039    /**
040     * Constructs a new instance with the specified appendable.
041     *
042     * @param appendable the appendable to write to
043     */
044    public AppendableOutputStream(final T appendable) {
045        this.appendable = appendable;
046    }
047
048    /**
049     * Gets the target appendable.
050     *
051     * @return the target appendable
052     */
053    public T getAppendable() {
054        return appendable;
055    }
056
057    /**
058     * Write a character to the underlying appendable.
059     *
060     * @param b the character to write
061     * @throws IOException upon error
062     */
063    @Override
064    public void write(final int b) throws IOException {
065        appendable.append((char) b);
066    }
067
068}