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- /*
- * Copyright (C) 2010, Marc Strapetz <marc.strapetz@syntevo.com>
- * 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.attributes;
-
- /**
- * Represents an attribute.
- * <p>
- * According to the man page, an attribute can have the following states:
- * <ul>
- * <li>Set - represented by {@link State#SET}</li>
- * <li>Unset - represented by {@link State#UNSET}</li>
- * <li>Set to a value - represented by {@link State#CUSTOM}</li>
- * <li>Unspecified - used to revert an attribute . This is crucial in order to
- * mark an attribute as unspecified in the attributes map and thus preventing
- * following (with lower priority) nodes from setting the attribute to a value
- * at all</li>
- * </ul>
- * </p>
- *
- * @since 3.7
- */
- public final class Attribute {
-
- /**
- * The attribute value state
- * see also https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
- */
- public static enum State {
- /** the attribute is set */
- SET,
-
- /** the attribute is unset */
- UNSET,
-
- /**
- * the attribute appears as if it would not be defined at all
- *
- * @since 4.2
- */
- UNSPECIFIED,
-
- /** the attribute is set to a custom value */
- CUSTOM
- }
-
- private final String key;
- private final State state;
- private final String value;
-
- /**
- * Creates a new instance
- *
- * @param key
- * the attribute key. Should not be <code>null</code>.
- * @param state
- * the attribute state. It should be either {@link State#SET} or
- * {@link State#UNSET}. In order to create a custom value
- * attribute prefer the use of {@link #Attribute(String, String)}
- * constructor.
- */
- public Attribute(String key, State state) {
- this(key, state, null);
- }
-
- private Attribute(String key, State state, String value) {
- if (key == null)
- throw new NullPointerException(
- "The key of an attribute should not be null"); //$NON-NLS-1$
- if (state == null)
- throw new NullPointerException(
- "The state of an attribute should not be null"); //$NON-NLS-1$
-
- this.key = key;
- this.state = state;
- this.value = value;
- }
-
- /**
- * Creates a new instance.
- *
- * @param key
- * the attribute key. Should not be <code>null</code>.
- * @param value
- * the custom attribute value
- */
- public Attribute(String key, String value) {
- this(key, State.CUSTOM, value);
- }
-
- @Override
- public boolean equals(Object obj) {
- if (this == obj)
- return true;
- if (!(obj instanceof Attribute))
- return false;
- Attribute other = (Attribute) obj;
- if (!key.equals(other.key))
- return false;
- if (state != other.state)
- return false;
- if (value == null) {
- if (other.value != null)
- return false;
- } else if (!value.equals(other.value))
- return false;
- return true;
- }
-
- /**
- * @return the attribute key (never returns <code>null</code>)
- */
- public String getKey() {
- return key;
- }
-
- /**
- * Returns the state.
- *
- * @return the state (never returns <code>null</code>)
- */
- public State getState() {
- return state;
- }
-
- /**
- * @return the attribute value (may be <code>null</code>)
- */
- public String getValue() {
- return value;
- }
-
- @Override
- public int hashCode() {
- final int prime = 31;
- int result = 1;
- result = prime * result + key.hashCode();
- result = prime * result + state.hashCode();
- result = prime * result + ((value == null) ? 0 : value.hashCode());
- return result;
- }
-
- @Override
- public String toString() {
- switch (state) {
- case SET:
- return key;
- case UNSET:
- return "-" + key; //$NON-NLS-1$
- case UNSPECIFIED:
- return "!" + key; //$NON-NLS-1$
- case CUSTOM:
- default:
- return key + "=" + value; //$NON-NLS-1$
- }
- }
- }
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