How to use

CharBuffer

in

juzu.impl.common

public Appendable append(CharSequence csq) throws IOException {
 return append(csq, 0, csq.length());
}

 public Appendable append(char c) throws IOException {
  ensure(1);
  chars[to++] = c;
  return this;
 }
}

@Test
public void testReadAt() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 char[] tmp = "___".toCharArray();
 assertEquals(2, buffer.writeTo(tmp, 1, 2));
 Assert.assertEquals("_ab", new String(tmp));
}

@Test
public void testWriteToAppendable() throws IOException {
 CharBuffer buffer = new CharBuffer();
 buffer.append("abc");
 StringBuilder sb = new StringBuilder();
 buffer.writeTo(sb);
 assertEquals("abc", sb.toString());
 assertEquals(0, buffer.getLength());
}

@Test
public void testPartialRead() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("abcd".toCharArray(), 0, 4);
 Assert.assertEquals(4, buffer.getLength());
 assertContent(buffer, "ab");
 Assert.assertEquals(2, buffer.getLength());
 assertContent(buffer, "cd");
 Assert.assertEquals(0, buffer.getLength());
}

@Test
public void testResize() {
 CharBuffer buffer = new CharBuffer(4);
 assertEquals(4, buffer.getSize());
 buffer.readFrom("abcde".toCharArray(), 0, 5);
 assertTrue(buffer.getLength() > 4);
 assertContent(buffer, "abcde");
}

@Test
public void testReadTooMuch() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 Assert.assertEquals(2, buffer.getLength());
 char[] tmp = "___".toCharArray();
 assertEquals(2, buffer.writeTo(tmp, 0, 3));
 Assert.assertEquals(0, buffer.getLength());
 Assert.assertEquals("ab_", new String(tmp));
}

@Test
public void testAsAppendable() throws IOException {
 CharBuffer buffer = new CharBuffer();
 buffer.append("abc");
 assertContent(buffer, "abc");
}

@Test
public void testAppend() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 buffer.readFrom("cd".toCharArray(), 0, 2);
 assertContent(buffer, "abcd");
}

 private void assertContent(CharBuffer buffer, String expected) {
  char[] tmp = new char[expected.length()];
  Assert.assertEquals(expected.length(), buffer.writeTo(tmp, 0, expected.length()));
  Assert.assertEquals(expected, new String(tmp));
 }
}

@Test
public void testReadAt() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 char[] tmp = "___".toCharArray();
 assertEquals(2, buffer.writeTo(tmp, 1, 2));
 Assert.assertEquals("_ab", new String(tmp));
}

@Test
public void testWriteToAppendable() throws IOException {
 CharBuffer buffer = new CharBuffer();
 buffer.append("abc");
 StringBuilder sb = new StringBuilder();
 buffer.writeTo(sb);
 assertEquals("abc", sb.toString());
 assertEquals(0, buffer.getLength());
}

@Test
public void testPartialRead() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("abcd".toCharArray(), 0, 4);
 Assert.assertEquals(4, buffer.getLength());
 assertContent(buffer, "ab");
 Assert.assertEquals(2, buffer.getLength());
 assertContent(buffer, "cd");
 Assert.assertEquals(0, buffer.getLength());
}

@Test
public void testResize() {
 CharBuffer buffer = new CharBuffer(4);
 assertEquals(4, buffer.getSize());
 buffer.readFrom("abcde".toCharArray(), 0, 5);
 assertTrue(buffer.getLength() > 4);
 assertContent(buffer, "abcde");
}

@Test
public void testReadTooMuch() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 Assert.assertEquals(2, buffer.getLength());
 char[] tmp = "___".toCharArray();
 assertEquals(2, buffer.writeTo(tmp, 0, 3));
 Assert.assertEquals(0, buffer.getLength());
 Assert.assertEquals("ab_", new String(tmp));
}

@Test
public void testAsAppendable() throws IOException {
 CharBuffer buffer = new CharBuffer();
 buffer.append("abc");
 assertContent(buffer, "abc");
}

@Test
public void testAppend() {
 CharBuffer buffer = new CharBuffer();
 buffer.readFrom("ab".toCharArray(), 0, 2);
 buffer.readFrom("cd".toCharArray(), 0, 2);
 assertContent(buffer, "abcd");
}

 private void assertContent(CharBuffer buffer, String expected) {
  char[] tmp = new char[expected.length()];
  Assert.assertEquals(expected.length(), buffer.writeTo(tmp, 0, expected.length()));
  Assert.assertEquals(expected, new String(tmp));
 }
}

@Test
public void testNPE() {
 CharBuffer buffer = new CharBuffer();
 try {
  buffer.writeTo(null, 0, 1);
  fail();
 }
 catch (NullPointerException expected) {
 }
 try {
  buffer.readFrom(null, 0, 1);
  fail();
 }
 catch (NullPointerException expected) {
 }
}

@Test
public void testSimple() {
 CharBuffer buffer = new CharBuffer();
 assertEquals(0, buffer.getLength());
 buffer.readFrom("a".toCharArray(), 0, 1);
 assertContent(buffer, "a");
}