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Diffstat (limited to 'bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/streams/SizeConstrainedInputStream.java')
-rw-r--r-- | bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/streams/SizeConstrainedInputStream.java | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/streams/SizeConstrainedInputStream.java b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/streams/SizeConstrainedInputStream.java deleted file mode 100644 index d7d26cac8..000000000 --- a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/streams/SizeConstrainedInputStream.java +++ /dev/null @@ -1,138 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2003 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Common Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/cpl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package org.eclipse.team.internal.core.streams; - -import java.io.FilterInputStream; -import java.io.IOException; -import java.io.InputStream; -import java.io.InterruptedIOException; - -import org.eclipse.core.runtime.OperationCanceledException; - -/** - * Simulates a stream that represents only a portion of the underlying stream. - * Will report EOF when this portion has been fully read and prevent further reads. - * The underlying stream is not closed on close(), but the remaining unread input - * may optionally be skip()'d. - * - * Supports resuming partially completed operations after an InterruptedIOException - * if the underlying stream does. Check the bytesTransferred field to determine how - * much of the operation completed; conversely, at what point to resume. - */ -public class SizeConstrainedInputStream extends FilterInputStream { - private boolean discardOnClose; - private long bytesRemaining; - - /** - * Creates a size contrained input stream. - * @param in the underlying input stream, never actually closed by this filter - * @param size the maximum number of bytes of the underlying input stream that - * can be read through this filter - * @param discardOnClose if true, discards remaining unread bytes on close() - */ - public SizeConstrainedInputStream(InputStream in, long size, boolean discardOnClose) { - super(in); - this.bytesRemaining = size; - this.discardOnClose = discardOnClose; - } - - /** - * Prevents further reading from the stream but does not close the underlying stream. - * If discardOnClose, skip()'s over any remaining unread bytes in the constrained region. - * @throws IOException if an i/o error occurs - */ - public void close() throws IOException { - try { - if (discardOnClose) { - while (bytesRemaining != 0 && skip(bytesRemaining) != 0); - } - } catch (OperationCanceledException e) { - // The receiver is likely wrapping a PollingInputStream which could throw - // an OperationCanceledException on a skip. - // Since we're closing, just ignore the cancel and let the caller check the monitor - } finally { - bytesRemaining = 0; - } - } - - /** - * Wraps the underlying stream's method. - * Simulates an end-of-file condition if the end of the constrained region has been reached. - * @throws IOException if an i/o error occurs - */ - public int available() throws IOException { - int amount = in.available(); - if (amount > bytesRemaining) amount = (int) bytesRemaining; - return amount; - } - - /** - * Wraps the underlying stream's method. - * Simulates an end-of-file condition if the end of the constrained region has been reached. - * @throws InterruptedIOException if the operation was interrupted before all of the - * bytes specified have been skipped, bytesTransferred will be zero - * @throws IOException if an i/o error occurs - */ - public int read() throws IOException { - if (bytesRemaining == 0) return -1; - int b = in.read(); - if (b != -1) bytesRemaining -= 1; - return b; - } - - /** - * Wraps the underlying stream's method. - * Simulates an end-of-file condition if the end of the constrained region has been reached. - * @throws InterruptedIOException if the operation was interrupted before all of the - * bytes specified have been skipped, bytesTransferred may be non-zero - * @throws IOException if an i/o error occurs - */ - public int read(byte[] buffer, int offset, int length) throws IOException { - if (length > bytesRemaining) { - if (bytesRemaining == 0) return -1; - length = (int) bytesRemaining; - } - try { - int count = in.read(buffer, offset, length); - if (count != -1) bytesRemaining -= count; - return count; - } catch (InterruptedIOException e) { - bytesRemaining -= e.bytesTransferred; - throw e; - } - } - - /** - * Wraps the underlying stream's method. - * Simulates an end-of-file condition if the end of the constrained region has been reached. - * @throws InterruptedIOException if the operation was interrupted before all of the - * bytes specified have been skipped, bytesTransferred may be non-zero - * @throws IOException if an i/o error occurs - */ - public long skip(long amount) throws IOException { - if (amount > bytesRemaining) amount = bytesRemaining; - try { - long count = in.skip(amount); - bytesRemaining -= count; - return count; - } catch (InterruptedIOException e) { - bytesRemaining -= e.bytesTransferred; - throw e; - } - } - - /** - * Mark is not supported by the wrapper even if the underlying stream does, returns false. - */ - public boolean markSupported() { - return false; - } -} |