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- /*
- * Copyright (C) 2019, Google LLC.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.transport;
-
- import java.text.MessageFormat;
-
- import org.eclipse.jgit.annotations.Nullable;
- import org.eclipse.jgit.errors.PackProtocolException;
- import org.eclipse.jgit.internal.JGitText;
-
- /**
- * Represents either a filter specified in a protocol "filter" line, or a
- * placeholder to indicate no filtering.
- *
- * @since 5.4
- */
- public final class FilterSpec {
-
- private final long blobLimit;
-
- private final long treeDepthLimit;
-
- private FilterSpec(long blobLimit, long treeDepthLimit) {
- this.blobLimit = blobLimit;
- this.treeDepthLimit = treeDepthLimit;
- }
-
- /**
- * Process the content of "filter" line from the protocol. It has a shape
- * like:
- *
- * <ul>
- * <li>"blob:none"
- * <li>"blob:limit=N", with N >= 0
- * <li>"tree:DEPTH", with DEPTH >= 0
- * </ul>
- *
- * @param filterLine
- * the content of the "filter" line in the protocol
- * @return a FilterSpec representing the given filter
- * @throws PackProtocolException
- * invalid filter because due to unrecognized format or
- * negative/non-numeric filter.
- */
- public static FilterSpec fromFilterLine(String filterLine)
- throws PackProtocolException {
- if (filterLine.equals("blob:none")) { //$NON-NLS-1$
- return FilterSpec.withBlobLimit(0);
- } else if (filterLine.startsWith("blob:limit=")) { //$NON-NLS-1$
- long blobLimit = -1;
- try {
- blobLimit = Long
- .parseLong(filterLine.substring("blob:limit=".length())); //$NON-NLS-1$
- } catch (NumberFormatException e) {
- // Do not change blobLimit so that we throw a
- // PackProtocolException later.
- }
- if (blobLimit >= 0) {
- return FilterSpec.withBlobLimit(blobLimit);
- }
- } else if (filterLine.startsWith("tree:")) { //$NON-NLS-1$
- long treeDepthLimit = -1;
- try {
- treeDepthLimit = Long
- .parseLong(filterLine.substring("tree:".length())); //$NON-NLS-1$
- } catch (NumberFormatException e) {
- // Do not change blobLimit so that we throw a
- // PackProtocolException later.
- }
- if (treeDepthLimit >= 0) {
- return FilterSpec.withTreeDepthLimit(treeDepthLimit);
- }
- }
-
- // Did not match any known filter format.
- throw new PackProtocolException(
- MessageFormat.format(JGitText.get().invalidFilter, filterLine));
- }
-
- /**
- * @param blobLimit
- * the blob limit in a "blob:[limit]" or "blob:none" filter line
- * @return a filter spec which filters blobs above a certain size
- */
- static FilterSpec withBlobLimit(long blobLimit) {
- if (blobLimit < 0) {
- throw new IllegalArgumentException(
- "blobLimit cannot be negative: " + blobLimit); //$NON-NLS-1$
- }
- return new FilterSpec(blobLimit, -1);
- }
-
- /**
- * @param treeDepthLimit
- * the tree depth limit in a "tree:[depth]" filter line
- * @return a filter spec which filters blobs and trees beyond a certain tree
- * depth
- */
- static FilterSpec withTreeDepthLimit(long treeDepthLimit) {
- if (treeDepthLimit < 0) {
- throw new IllegalArgumentException(
- "treeDepthLimit cannot be negative: " + treeDepthLimit); //$NON-NLS-1$
- }
- return new FilterSpec(-1, treeDepthLimit);
- }
-
- /**
- * A placeholder that indicates no filtering.
- */
- public static final FilterSpec NO_FILTER = new FilterSpec(-1, -1);
-
- /**
- * @return -1 if this filter does not filter blobs based on size, or a
- * non-negative integer representing the max size of blobs to allow
- */
- public long getBlobLimit() {
- return blobLimit;
- }
-
- /**
- * @return -1 if this filter does not filter blobs and trees based on depth,
- * or a non-negative integer representing the max tree depth of
- * blobs and trees to fetch
- */
- public long getTreeDepthLimit() {
- return treeDepthLimit;
- }
-
- /**
- * @return true if this filter doesn't filter out anything
- */
- public boolean isNoOp() {
- return blobLimit == -1 && treeDepthLimit == -1;
- }
-
- /**
- * @return the filter line which describes this spec, e.g. "filter blob:limit=42"
- */
- @Nullable
- public String filterLine() {
- if (blobLimit == 0) {
- return GitProtocolConstants.OPTION_FILTER + " blob:none"; //$NON-NLS-1$
- }
-
- if (blobLimit > 0) {
- return GitProtocolConstants.OPTION_FILTER + " blob:limit=" + blobLimit; //$NON-NLS-1$
- }
-
- return null;
- }
- }
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