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97 lines (83 loc) · 2.68 KB
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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC 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 org.openqa.selenium.json;
import org.openqa.selenium.internal.Require;
import java.io.IOException;
import java.io.Reader;
import java.io.UncheckedIOException;
/**
* Similar to a {@link Reader} but with the ability to peek a single character ahead.
* <p>
* For the sake of providing a useful {@link #toString()} implementation, keeps a small circular
* buffer of the most recently read characters.
*/
class Input {
public static final char EOF = (char) -1;
private final Reader source;
private boolean read;
private char peekedChar;
private char[] lastRead = new char[128];
private int insertAt = 0;
private boolean filled = false;
public Input(Reader source) {
this.source = Require.nonNull("Source", source);
}
public char peek() {
init();
return peekedChar;
}
public char read() {
init();
read = false;
append();
return peekedChar;
}
@Override
public String toString() {
String preamble = "Last " + (filled ? lastRead.length : insertAt) + " characters read: ";
if (!filled) {
return preamble + new String(lastRead, 0, insertAt);
}
// We filled the array. The insertion point would overwrite the first thing we should read.
char[] buf = new char[lastRead.length];
int lengthToRead = lastRead.length - insertAt;
System.arraycopy(lastRead, insertAt, buf, 0, lengthToRead);
System.arraycopy(lastRead, 0, buf, lengthToRead, insertAt);
return preamble + new String(buf);
}
private void init() {
if (read) {
return;
}
try {
peekedChar = (char) source.read();
} catch (IOException e) {
throw new UncheckedIOException(e.getMessage(), e);
}
read = true;
}
private void append() {
if (peekedChar == Input.EOF) {
return;
}
lastRead[insertAt] = peekedChar;
insertAt = ++insertAt % lastRead.length;
if (insertAt == 0) {
filled = true;
}
}
}