FastCharArrayWriter.java

/**
 * Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
 *
 *   Author: Guoqiang Chen
 *    Email: subchen@gmail.com
 *   WebURL: https://github.com/subchen
 *
 * 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 jetbrick.io.stream;

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

import jetbrick.io.buffer.FastCharBuffer;

public class FastCharArrayWriter extends Writer {
    private final FastCharBuffer buffer;

    /**
     * Creates a new writer. The buffer capacity is
     * initially 1024 bytes, though its size increases if necessary.
     */
    public FastCharArrayWriter() {
        this(1024);
    }

    /**
     * Creates a new char array writer, with a buffer capacity of
     * the specified size, in bytes.
     *
     * @param size the initial size.
     * @throws IllegalArgumentException if size is negative.
     */
    public FastCharArrayWriter(int size) {
        buffer = new FastCharBuffer(size);
    }

    /**
     * @see java.io.Writer#write(char[], int, int)
     */
    @Override
    public void write(char[] b, int off, int len) {
        buffer.append(b, off, len);
    }

    /**
     * Writes single byte.
     */
    @Override
    public void write(int b) {
        buffer.append((char) b);
    }

    @Override
    public void write(String s, int off, int len) {
        write(s.toCharArray(), off, len);
    }

    /**
     * @see java.io.CharArrayWriter#size()
     */
    public int size() {
        return buffer.size();
    }

    /**
     * Closing a <code>FastCharArrayWriter</code> has no effect. The methods in
     * this class can be called after the stream has been closed without
     * generating an <code>IOException</code>.
     */
    @Override
    public void close() {
        //nop
    }

    /**
     * Flushing a <code>FastCharArrayWriter</code> has no effects.
     */
    @Override
    public void flush() {
        //nop
    }

    /**
     * @see java.io.CharArrayWriter#reset()
     */
    public void reset() {
        buffer.clear();
    }

    /**
     * @see java.io.CharArrayWriter#writeTo(java.io.Writer)
     */
    public void writeTo(Writer out) throws IOException {
        int index = buffer.index();
        for (int i = 0; i < index; i++) {
            char[] buf = buffer.array(i);
            out.write(buf);
        }
        out.write(buffer.array(index), 0, buffer.offset());
    }

    /**
     * @see java.io.CharArrayWriter#toCharArray()
     */
    public char[] toCharArray() {
        return buffer.toArray();
    }

    /**
     * @see java.io.CharArrayWriter#toString()
     */
    @Override
    public String toString() {
        return new String(toCharArray());
    }
}