com.davidbracewell.io.resource.StringResource Maven / Gradle / Ivy

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A set of utilities and tools to speed up and ease programming in Java.
There is a newer version: 0.5
/*
 * (c) 2005 David B. Bracewell
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.davidbracewell.io.resource;

import com.davidbracewell.stream.MStream;
import com.davidbracewell.stream.Streams;
import lombok.EqualsAndHashCode;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;

/**
 *  A resource that wraps a String. 
 *
 * @author David B. Bracewell
 */
@EqualsAndHashCode(callSuper = true)
public class StringResource extends BaseResource implements NonTraversableResource {

  private static final long serialVersionUID = 8750046186020559958L;
  private final StringBuilder resource;

  /**
   * Instantiates a new string resource.
   */
  public StringResource() {
    this(null);
  }

  @Override
  public String readToString() throws IOException {
    return resource.toString();
  }

  @Override
  public byte[] readBytes() throws IOException {
    return resource.toString().getBytes();
  }

  @Override
  public Reader reader() throws IOException {
    return new StringReader(readToString());
  }

  @Override
  public List readLines() throws IOException {
    return Arrays.asList(readToString().split("\r?\n"));
  }

  /**
   *  Creates a Resource that is a String. 
   *
   * @param resource The string contents.
   */
  public StringResource(String resource) {
    if (resource == null) {
      this.resource = new StringBuilder();
    } else {
      this.resource = new StringBuilder(resource);
    }
  }

  @Override
  public Resource append(String content) throws IOException {
    resource.append(content);
    return this;
  }

  @Override
  public Resource append(byte[] byteArray) throws IOException {
    return append(byteArray == null ? null : new String(byteArray, getCharset()));
  }

  @Override
  public boolean exists() {
    return true;
  }

  @Override
  public MStream lines() throws IOException {
    return Streams.of(false, resource.toString().split("\r?\n"));
  }

  @Override
  protected InputStream createInputStream() throws IOException {
    return new ByteArrayInputStream(resource.toString().getBytes(StandardCharsets.UTF_8));
  }

  @Override
  protected OutputStream createOutputStream() throws IOException {
    this.resource.setLength(0);
    return new OutputStream() {
      ByteArrayOutputStream baos = new ByteArrayOutputStream();

      @Override
      public void write(int b) throws IOException {
        baos.write(b);
      }

      @Override
      public void close() throws IOException {
        super.close();
        resource.setLength(0);
        resource.append(baos.toString("UTF-8"));
        baos.close();
      }
    };
  }

}// END OF StringResource