J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.print.attribute; |
| 27 | |
| 28 | /** |
| 29 | * Interface AttributeSet specifies the interface for a set of printing |
| 30 | * attributes. A printing attribute is an object whose class implements |
| 31 | * interface {@link Attribute Attribute}. |
| 32 | * <P> |
| 33 | * An attribute set contains a group of <I>attribute values,</I> |
| 34 | * where duplicate values are not allowed in the set. |
| 35 | * Furthermore, each value in an attribute set is |
| 36 | * a member of some <I>category,</I> and at most one value in any particular |
| 37 | * category is allowed in the set. For an attribute set, the values are {@link |
| 38 | * Attribute Attribute} objects, and the categories are {@link java.lang.Class |
| 39 | * Class} objects. An attribute's category is the class (or interface) at the |
| 40 | * root of the class hierarchy for that kind of attribute. Note that an |
| 41 | * attribute object's category may be a superclass of the attribute object's |
| 42 | * class rather than the attribute object's class itself. An attribute |
| 43 | * object's |
| 44 | * category is determined by calling the {@link Attribute#getCategory() |
| 45 | * <CODE>getCategory()</CODE>} method defined in interface {@link Attribute |
| 46 | * Attribute}. |
| 47 | * <P> |
| 48 | * The interfaces of an AttributeSet resemble those of the Java Collections |
| 49 | * API's java.util.Map interface, but is more restrictive in the types |
| 50 | * it will accept, and combines keys and values into an Attribute. |
| 51 | * <P> |
| 52 | * Attribute sets are used in several places in the Print Service API. In |
| 53 | * each context, only certain kinds of attributes are allowed to appear in the |
| 54 | * attribute set, as determined by the tagging interfaces which the attribute |
| 55 | * class implements -- {@link DocAttribute DocAttribute}, {@link |
| 56 | * PrintRequestAttribute PrintRequestAttribute}, {@link PrintJobAttribute |
| 57 | * PrintJobAttribute}, and {@link PrintServiceAttribute |
| 58 | * PrintServiceAttribute}. |
| 59 | * There are four specializations of an attribute set that are restricted to |
| 60 | * contain just one of the four kinds of attribute -- {@link DocAttributeSet |
| 61 | * DocAttributeSet}, {@link PrintRequestAttributeSet |
| 62 | * PrintRequestAttributeSet}, |
| 63 | * {@link PrintJobAttributeSet PrintJobAttributeSet}, and {@link |
| 64 | * PrintServiceAttributeSet PrintServiceAttributeSet}, respectively. Note that |
| 65 | * many attribute classes implement more than one tagging interface and so may |
| 66 | * appear in more than one context. |
| 67 | * <UL> |
| 68 | * <LI> |
| 69 | * A {@link DocAttributeSet DocAttributeSet}, containing {@link DocAttribute |
| 70 | * DocAttribute}s, specifies the characteristics of an individual doc and the |
| 71 | * print job settings to be applied to an individual doc. |
| 72 | * <P> |
| 73 | * <LI> |
| 74 | * A {@link PrintRequestAttributeSet PrintRequestAttributeSet}, containing |
| 75 | * {@link PrintRequestAttribute PrintRequestAttribute}s, specifies the |
| 76 | * settings |
| 77 | * to be applied to a whole print job and to all the docs in the print job. |
| 78 | * <P> |
| 79 | * <LI> |
| 80 | * A {@link PrintJobAttributeSet PrintJobAttributeSet}, containing {@link |
| 81 | * PrintJobAttribute PrintJobAttribute}s, reports the status of a print job. |
| 82 | * <P> |
| 83 | * <LI> |
| 84 | * A {@link PrintServiceAttributeSet PrintServiceAttributeSet}, containing |
| 85 | * {@link PrintServiceAttribute PrintServiceAttribute}s, reports the status of |
| 86 | * a Print Service instance. |
| 87 | * </UL> |
| 88 | * <P> |
| 89 | * In some contexts, the client is only allowed to examine an attribute set's |
| 90 | * contents but not change them (the set is read-only). In other places, the |
| 91 | * client is allowed both to examine and to change an attribute set's contents |
| 92 | * (the set is read-write). For a read-only attribute set, calling a mutating |
| 93 | * operation throws an UnmodifiableSetException. |
| 94 | * <P> |
| 95 | * The Print Service API provides one implementation of interface |
| 96 | * AttributeSet, class {@link HashAttributeSet HashAttributeSet}. |
| 97 | * A client can use class {@link |
| 98 | * HashAttributeSet HashAttributeSet} or provide its own implementation of |
| 99 | * interface AttributeSet. The Print Service API also provides |
| 100 | * implementations of interface AttributeSet's subinterfaces -- classes {@link |
| 101 | * HashDocAttributeSet HashDocAttributeSet}, |
| 102 | * {@link HashPrintRequestAttributeSet |
| 103 | * HashPrintRequestAttributeSet}, {@link HashPrintJobAttributeSet |
| 104 | * HashPrintJobAttributeSet}, and {@link HashPrintServiceAttributeSet |
| 105 | * HashPrintServiceAttributeSet}. |
| 106 | * <P> |
| 107 | * |
| 108 | * @author Alan Kaminsky |
| 109 | */ |
| 110 | public interface AttributeSet { |
| 111 | |
| 112 | |
| 113 | /** |
| 114 | * Returns the attribute value which this attribute set contains in the |
| 115 | * given attribute category. Returns <tt>null</tt> if this attribute set |
| 116 | * does not contain any attribute value in the given attribute category. |
| 117 | * |
| 118 | * @param category Attribute category whose associated attribute value |
| 119 | * is to be returned. It must be a |
| 120 | * {@link java.lang.Class Class} |
| 121 | * that implements interface {@link Attribute |
| 122 | * Attribute}. |
| 123 | * |
| 124 | * @return The attribute value in the given attribute category contained |
| 125 | * in this attribute set, or <tt>null</tt> if this attribute set |
| 126 | * does not contain any attribute value in the given attribute |
| 127 | * category. |
| 128 | * |
| 129 | * @throws NullPointerException |
| 130 | * (unchecked exception) Thrown if the <CODE>category</CODE> is null. |
| 131 | * @throws ClassCastException |
| 132 | * (unchecked exception) Thrown if the <CODE>category</CODE> is not a |
| 133 | * {@link java.lang.Class Class} that implements interface {@link |
| 134 | * Attribute Attribute}. |
| 135 | */ |
| 136 | public Attribute get(Class<?> category); |
| 137 | |
| 138 | /** |
| 139 | * Adds the specified attribute to this attribute set if it is not |
| 140 | * already present, first removing any existing value in the same |
| 141 | * attribute category as the specified attribute value. |
| 142 | * |
| 143 | * @param attribute Attribute value to be added to this attribute set. |
| 144 | * |
| 145 | * @return <tt>true</tt> if this attribute set changed as a result of the |
| 146 | * call, i.e., the given attribute value was not already a member |
| 147 | * of this attribute set. |
| 148 | * |
| 149 | * @throws NullPointerException |
| 150 | * (unchecked exception) Thrown if the <CODE>attribute</CODE> is null. |
| 151 | * @throws UnmodifiableSetException |
| 152 | * (unchecked exception) Thrown if this attribute set does not support |
| 153 | * the <CODE>add()</CODE> operation. |
| 154 | */ |
| 155 | public boolean add(Attribute attribute); |
| 156 | |
| 157 | |
| 158 | /** |
| 159 | * Removes any attribute for this category from this attribute set if |
| 160 | * present. If <CODE>category</CODE> is null, then |
| 161 | * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>. |
| 162 | * |
| 163 | * @param category Attribute category to be removed from this |
| 164 | * attribute set. |
| 165 | * |
| 166 | * @return <tt>true</tt> if this attribute set changed as a result of the |
| 167 | * call, i.e., the given attribute value had been a member of this |
| 168 | * attribute set. |
| 169 | * |
| 170 | * @throws UnmodifiableSetException |
| 171 | * (unchecked exception) Thrown if this attribute set does not support |
| 172 | * the <CODE>remove()</CODE> operation. |
| 173 | */ |
| 174 | public boolean remove(Class<?> category); |
| 175 | |
| 176 | /** |
| 177 | * Removes the specified attribute from this attribute set if |
| 178 | * present. If <CODE>attribute</CODE> is null, then |
| 179 | * <CODE>remove()</CODE> does nothing and returns <tt>false</tt>. |
| 180 | * |
| 181 | * @param attribute Attribute value to be removed from this attribute set. |
| 182 | * |
| 183 | * @return <tt>true</tt> if this attribute set changed as a result of the |
| 184 | * call, i.e., the given attribute value had been a member of this |
| 185 | * attribute set. |
| 186 | * |
| 187 | * @throws UnmodifiableSetException |
| 188 | * (unchecked exception) Thrown if this attribute set does not support |
| 189 | * the <CODE>remove()</CODE> operation. |
| 190 | */ |
| 191 | public boolean remove(Attribute attribute); |
| 192 | |
| 193 | /** |
| 194 | * Returns <tt>true</tt> if this attribute set contains an |
| 195 | * attribute for the specified category. |
| 196 | * |
| 197 | * @param category whose presence in this attribute set is |
| 198 | * to be tested. |
| 199 | * |
| 200 | * @return <tt>true</tt> if this attribute set contains an attribute |
| 201 | * value for the specified category. |
| 202 | */ |
| 203 | public boolean containsKey(Class<?> category); |
| 204 | |
| 205 | /** |
| 206 | * Returns <tt>true</tt> if this attribute set contains the given |
| 207 | * attribute value. |
| 208 | * |
| 209 | * @param attribute Attribute value whose presence in this |
| 210 | * attribute set is to be tested. |
| 211 | * |
| 212 | * @return <tt>true</tt> if this attribute set contains the given |
| 213 | * attribute value. |
| 214 | */ |
| 215 | public boolean containsValue(Attribute attribute); |
| 216 | |
| 217 | /** |
| 218 | * Adds all of the elements in the specified set to this attribute. |
| 219 | * The outcome is the same as if the = |
| 220 | * {@link #add(Attribute) <CODE>add(Attribute)</CODE>} |
| 221 | * operation had been applied to this attribute set successively with each |
| 222 | * element from the specified set. |
| 223 | * The behavior of the <CODE>addAll(AttributeSet)</CODE> |
| 224 | * operation is unspecified if the specified set is modified while |
| 225 | * the operation is in progress. |
| 226 | * <P> |
| 227 | * If the <CODE>addAll(AttributeSet)</CODE> operation throws an exception, |
| 228 | * the effect on this attribute set's state is implementation dependent; |
| 229 | * elements from the specified set before the point of the exception may |
| 230 | * or may not have been added to this attribute set. |
| 231 | * |
| 232 | * @param attributes whose elements are to be added to this attribute |
| 233 | * set. |
| 234 | * |
| 235 | * @return <tt>true</tt> if this attribute set changed as a result of the |
| 236 | * call. |
| 237 | * |
| 238 | * @throws UnmodifiableSetException |
| 239 | * (Unchecked exception) Thrown if this attribute set does not support |
| 240 | * the <tt>addAll(AttributeSet)</tt> method. |
| 241 | * @throws NullPointerException |
| 242 | * (Unchecked exception) Thrown if some element in the specified |
| 243 | * set is null. |
| 244 | * |
| 245 | * @see #add(Attribute) |
| 246 | */ |
| 247 | public boolean addAll(AttributeSet attributes); |
| 248 | |
| 249 | /** |
| 250 | * Returns the number of attributes in this attribute set. If this |
| 251 | * attribute set contains more than <tt>Integer.MAX_VALUE</tt> elements, |
| 252 | * returns <tt>Integer.MAX_VALUE</tt>. |
| 253 | * |
| 254 | * @return The number of attributes in this attribute set. |
| 255 | */ |
| 256 | public int size(); |
| 257 | |
| 258 | /** |
| 259 | * Returns an array of the attributes contained in this set. |
| 260 | * @return the Attributes contained in this set as an array, zero length |
| 261 | * if the AttributeSet is empty. |
| 262 | */ |
| 263 | public Attribute[] toArray(); |
| 264 | |
| 265 | |
| 266 | /** |
| 267 | * Removes all attributes from this attribute set. |
| 268 | * |
| 269 | * @throws UnmodifiableSetException |
| 270 | * (unchecked exception) Thrown if this attribute set does not support |
| 271 | * the <CODE>clear()</CODE> operation. |
| 272 | */ |
| 273 | public void clear(); |
| 274 | |
| 275 | /** |
| 276 | * Returns true if this attribute set contains no attributes. |
| 277 | * |
| 278 | * @return true if this attribute set contains no attributes. |
| 279 | */ |
| 280 | public boolean isEmpty(); |
| 281 | |
| 282 | /** |
| 283 | * Compares the specified object with this attribute set for equality. |
| 284 | * Returns <tt>true</tt> if the given object is also an attribute set and |
| 285 | * the two attribute sets contain the same attribute category-attribute |
| 286 | * value mappings. This ensures that the |
| 287 | * <tt>equals()</tt> method works properly across different |
| 288 | * implementations of the AttributeSet interface. |
| 289 | * |
| 290 | * @param object to be compared for equality with this attribute set. |
| 291 | * |
| 292 | * @return <tt>true</tt> if the specified object is equal to this |
| 293 | * attribute set. |
| 294 | */ |
| 295 | public boolean equals(Object object); |
| 296 | |
| 297 | /** |
| 298 | * Returns the hash code value for this attribute set. The hash code of an |
| 299 | * attribute set is defined to be the sum of the hash codes of each entry |
| 300 | * in the AttributeSet. |
| 301 | * This ensures that <tt>t1.equals(t2)</tt> implies that |
| 302 | * <tt>t1.hashCode()==t2.hashCode()</tt> for any two attribute sets |
| 303 | * <tt>t1</tt> and <tt>t2</tt>, as required by the general contract of |
| 304 | * {@link java.lang.Object#hashCode() <CODE>Object.hashCode()</CODE>}. |
| 305 | * |
| 306 | * @return The hash code value for this attribute set. |
| 307 | */ |
| 308 | public int hashCode(); |
| 309 | |
| 310 | } |