| 1 | /* |
| 2 | * jDTAUS Core API |
| 3 | * Copyright (C) 2005 Christian Schulte |
| 4 | * <cs@schulte.it> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | */ |
| 21 | package org.jdtaus.core.container; |
| 22 | |
| 23 | import java.io.Serializable; |
| 24 | import java.util.Arrays; |
| 25 | import java.util.Collection; |
| 26 | import java.util.HashMap; |
| 27 | import java.util.Map; |
| 28 | |
| 29 | /** |
| 30 | * Collection of implementations. |
| 31 | * |
| 32 | * @author <a href="mailto:cs@schulte.it">Christian Schulte</a> |
| 33 | * @version $JDTAUS: Implementations.java 8743 2012-10-07 03:06:20Z schulte $ |
| 34 | */ |
| 35 | public class Implementations extends ModelObject |
| 36 | implements Cloneable, Serializable |
| 37 | { |
| 38 | //--Constants--------------------------------------------------------------- |
| 39 | |
| 40 | /** Serial version UID for backwards compatibility with 1.0.x classes. */ |
| 41 | private static final long serialVersionUID = 5611937453792676565L; |
| 42 | |
| 43 | //---------------------------------------------------------------Constants-- |
| 44 | //--Implementations--------------------------------------------------------- |
| 45 | |
| 46 | /** |
| 47 | * The implementations held by the instance. |
| 48 | * @serial |
| 49 | */ |
| 50 | private Implementation[] implementations; |
| 51 | |
| 52 | /** |
| 53 | * Maps implementation identifiers to implementations. |
| 54 | * @serial |
| 55 | */ |
| 56 | private final Map identifiers = new HashMap(); |
| 57 | |
| 58 | /** |
| 59 | * Hash code. |
| 60 | * @serial |
| 61 | */ |
| 62 | private int hashCode; |
| 63 | |
| 64 | /** Creates a new {@code Implementations} instance. */ |
| 65 | public Implementations() |
| 66 | { |
| 67 | super(); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Gets all implementations of the collection. |
| 72 | * |
| 73 | * @return all implementations of the collection. |
| 74 | */ |
| 75 | public Implementation[] getImplementations() |
| 76 | { |
| 77 | if ( this.implementations == null ) |
| 78 | { |
| 79 | this.implementations = new Implementation[ 0 ]; |
| 80 | this.hashCode = 0; |
| 81 | } |
| 82 | |
| 83 | return this.implementations; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Setter for property {@code implementations}. |
| 88 | * |
| 89 | * @param value the new implementations for the instance. |
| 90 | * |
| 91 | * @throws DuplicateImplementationException if {@code value} contains |
| 92 | * duplicate implementations. |
| 93 | */ |
| 94 | public void setImplementations( final Implementation[] value ) |
| 95 | { |
| 96 | this.identifiers.clear(); |
| 97 | this.hashCode = 0; |
| 98 | this.implementations = null; |
| 99 | |
| 100 | if ( value != null ) |
| 101 | { |
| 102 | for ( int i = value.length - 1; i >= 0; i-- ) |
| 103 | { |
| 104 | this.hashCode += value[i].hashCode(); |
| 105 | |
| 106 | if ( this.identifiers.put( value[i].getIdentifier(), |
| 107 | value[i] ) != null ) |
| 108 | { |
| 109 | this.identifiers.clear(); |
| 110 | this.hashCode = 0; |
| 111 | |
| 112 | throw new DuplicateImplementationException( |
| 113 | value[i].getIdentifier() ); |
| 114 | |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | this.implementations = value; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Gets an implementation for an identifier. |
| 124 | * |
| 125 | * @param identifier the identifier of the implementation to return. |
| 126 | * |
| 127 | * @return a reference to the implementation identified by |
| 128 | * {@code identifier}. |
| 129 | * |
| 130 | * @throws NullPointerException if {@code identifier} is {@code null}. |
| 131 | * @throws MissingImplementationException if no implementation matching |
| 132 | * {@code identifier} exists in the collection. |
| 133 | */ |
| 134 | public Implementation getImplementation( final String identifier ) |
| 135 | { |
| 136 | if ( identifier == null ) |
| 137 | { |
| 138 | throw new NullPointerException( "identifier" ); |
| 139 | } |
| 140 | |
| 141 | final Implementation ret = |
| 142 | (Implementation) this.identifiers.get( identifier ); |
| 143 | |
| 144 | if ( ret == null ) |
| 145 | { |
| 146 | throw new MissingImplementationException( identifier ); |
| 147 | } |
| 148 | |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Gets an implementation for an index. |
| 154 | * |
| 155 | * @param index the index of the implementation to return. |
| 156 | * |
| 157 | * @return a reference to the implementation at {@code index}. |
| 158 | * |
| 159 | * @throws IndexOutOfBoundsException if {@code index} is negativ, |
| 160 | * greater than or equal to {@code size()}. |
| 161 | */ |
| 162 | public final Implementation getImplementation( final int index ) |
| 163 | { |
| 164 | if ( index < 0 || index >= this.size() ) |
| 165 | { |
| 166 | throw new ArrayIndexOutOfBoundsException( index ); |
| 167 | } |
| 168 | |
| 169 | return this.getImplementations()[index]; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Gets the number of implementations held by the instance. |
| 174 | * |
| 175 | * @return the number of implementations held by the instance. |
| 176 | */ |
| 177 | public final int size() |
| 178 | { |
| 179 | return this.getImplementations().length; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Creates a string representing the properties of the instance. |
| 184 | * |
| 185 | * @return a string representing the properties of the instance. |
| 186 | */ |
| 187 | private String internalString() |
| 188 | { |
| 189 | final StringBuffer buf = new StringBuffer( 200 ).append( '{' ); |
| 190 | buf.append( this.internalString( this ) ); |
| 191 | |
| 192 | final Implementation[] impls = this.getImplementations(); |
| 193 | for ( int i = impls.length - 1; i >= 0; i-- ) |
| 194 | { |
| 195 | buf.append( ", [" ).append( i ).append( "]=" ). |
| 196 | append( impls[i] ); |
| 197 | |
| 198 | } |
| 199 | |
| 200 | buf.append( '}' ); |
| 201 | return buf.toString(); |
| 202 | } |
| 203 | |
| 204 | //---------------------------------------------------------Implementations-- |
| 205 | //--Object------------------------------------------------------------------ |
| 206 | |
| 207 | /** |
| 208 | * Indicates whether some other object is equal to this one by comparing |
| 209 | * the values of all properties. |
| 210 | * |
| 211 | * @param o the reference object with which to compare. |
| 212 | * |
| 213 | * @return {@code true} if this object is the same as {@code o}; |
| 214 | * {@code false} otherwise. |
| 215 | */ |
| 216 | public boolean equals( final Object o ) |
| 217 | { |
| 218 | boolean equal = this == o; |
| 219 | |
| 220 | if ( !equal && o instanceof Implementations ) |
| 221 | { |
| 222 | final Implementations that = (Implementations) o; |
| 223 | final Collection these = Arrays.asList( this.getImplementations() ); |
| 224 | final Collection those = Arrays.asList( that.getImplementations() ); |
| 225 | |
| 226 | equal = this.size() == that.size() && these.containsAll( those ); |
| 227 | } |
| 228 | |
| 229 | return equal; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Returns a hash code value for this object. |
| 234 | * |
| 235 | * @return a hash code value for this object. |
| 236 | */ |
| 237 | public int hashCode() |
| 238 | { |
| 239 | return this.hashCode; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Returns a string representation of the object. |
| 244 | * |
| 245 | * @return a string representation of the object. |
| 246 | */ |
| 247 | public String toString() |
| 248 | { |
| 249 | return super.toString() + this.internalString(); |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * Creates and returns a deep copy of this object. |
| 254 | * |
| 255 | * @return a clone of this instance. |
| 256 | */ |
| 257 | public Object clone() |
| 258 | { |
| 259 | try |
| 260 | { |
| 261 | final Implementations ret = (Implementations) super.clone(); |
| 262 | final Implementation[] impls = this.getImplementations(); |
| 263 | final Implementation[] cloned = new Implementation[ impls.length ]; |
| 264 | |
| 265 | for ( int i = impls.length - 1; i >= 0; i-- ) |
| 266 | { |
| 267 | cloned[i] = (Implementation) impls[i].clone(); |
| 268 | } |
| 269 | |
| 270 | ret.setImplementations( cloned ); |
| 271 | return ret; |
| 272 | } |
| 273 | catch ( final CloneNotSupportedException e ) |
| 274 | { |
| 275 | throw new AssertionError( e ); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | //------------------------------------------------------------------Object-- |
| 280 | } |