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package webit.script.util;
// Copyright (c) 2003-2013, Jodd Team (jodd.org). All Rights Reserved.
//package jodd.io;

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

/**
 * Similar as {@link webit.script.util.FastByteArrayOutputStream} but for {@link Writer}.
 */
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
     * FastCharArrayWriter has no effect. The methods in this class
     * can be called after the stream has been closed without generating an
     * IOException.
     */
    @Override
    public void close() {
        //nop
    }

    /**
     * Flushing a
     * FastCharArrayWriter 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());
    }
}