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Groovy: A powerful, dynamic language for the JVM
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/*
 * Copyright 2003-2014 the original author or authors.
 *
 * 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 groovy.text.markup;

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

/**
 * A writer which delegates to another writer and supports an
 * additional indenting level.
 *
 * @author Cedric Champeau
 */
public class DelegatingIndentWriter extends Writer {
    public static final String SPACES = "    ";
    public static final String TAB = "\t";

    private final Writer delegate;
    private final String indentString;
    private int level;

    public DelegatingIndentWriter(final Writer delegate) {
        this(delegate, SPACES);
    }

    public DelegatingIndentWriter(final Writer delegate, final String indentString) {
        this.delegate = delegate;
        this.indentString = indentString;
    }

    @Override
    public void write(final int c) throws IOException {
        delegate.write(c);
    }

    @Override
    public void write(final char[] cbuf) throws IOException {
        delegate.write(cbuf);
    }

    @Override
    public void write(final char[] cbuf, final int off, final int len) throws IOException {
        delegate.write(cbuf, off, len);
    }

    @Override
    public void write(final String str) throws IOException {
        delegate.write(str);
    }

    @Override
    public void write(final String str, final int off, final int len) throws IOException {
        delegate.write(str, off, len);
    }

    @Override
    public Writer append(final CharSequence csq) throws IOException {
        return delegate.append(csq);
    }

    @Override
    public Writer append(final CharSequence csq, final int start, final int end) throws IOException {
        return delegate.append(csq, start, end);
    }

    @Override
    public Writer append(final char c) throws IOException {
        return delegate.append(c);
    }

    @Override
    public void flush() throws IOException {
        delegate.flush();
    }

    @Override
    public void close() throws IOException {
        delegate.close();
    }

    public int next() {
        return ++level;
    }

    public int previous() {
        return --level;
    }

    public void writeIndent() throws IOException {
        for (int i=0;i