CachingWriter.java

package org.codehaus.plexus.util.io;

/*
 * Copyright The Codehaus Foundation.
 *
 * 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.
 */

import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.Objects;

/**
 * Caching Writer to avoid overwriting a file with
 * the same content.
 */
public class CachingWriter extends OutputStreamWriter {
    private final CachingOutputStream cos;

    public CachingWriter(File path, Charset charset) throws IOException {
        this(Objects.requireNonNull(path).toPath(), charset);
    }

    public CachingWriter(Path path, Charset charset) throws IOException {
        this(path, charset, 32 * 1024);
    }

    public CachingWriter(Path path, Charset charset, int bufferSize) throws IOException {
        this(new CachingOutputStream(path, bufferSize), charset);
    }

    private CachingWriter(CachingOutputStream outputStream, Charset charset) throws IOException {
        super(outputStream, charset);
        this.cos = outputStream;
    }

    public boolean isModified() {
        return cos.isModified();
    }
}