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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 com.android.voicemail.impl.mail;
import java.io.IOException;
import java.io.InputStream;
/**
* A filtering InputStream that allows single byte "peeks" without consuming the byte. The client of
* this stream can call peek() to see the next available byte in the stream and a subsequent read
* will still return the peeked byte.
*/
public class PeekableInputStream extends InputStream {
private final InputStream mIn;
private boolean mPeeked;
private int mPeekedByte;
public PeekableInputStream(InputStream in) {
this.mIn = in;
}
@Override
public int read() throws IOException {
if (!mPeeked) {
return mIn.read();
} else {
mPeeked = false;
return mPeekedByte;
}
}
public int peek() throws IOException {
if (!mPeeked) {
mPeekedByte = read();
mPeeked = true;
}
return mPeekedByte;
}
@Override
public int read(byte[] b, int offset, int length) throws IOException {
if (!mPeeked) {
return mIn.read(b, offset, length);
} else {
b[0] = (byte) mPeekedByte;
mPeeked = false;
int r = mIn.read(b, offset + 1, length - 1);
if (r == -1) {
return 1;
} else {
return r + 1;
}
}
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public String toString() {
return String.format(
"PeekableInputStream(in=%s, peeked=%b, peekedByte=%d)",
mIn.toString(), mPeeked, mPeekedByte);
}
}
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