1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/mini/src/main/java/java/lang/Boolean.java Fri Mar 22 16:59:47 2013 +0100
1.3 @@ -0,0 +1,282 @@
1.4 +/*
1.5 + * Copyright (c) 1994, 2006, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package java.lang;
1.30 +
1.31 +/**
1.32 + * The Boolean class wraps a value of the primitive type
1.33 + * {@code boolean} in an object. An object of type
1.34 + * {@code Boolean} contains a single field whose type is
1.35 + * {@code boolean}.
1.36 + * <p>
1.37 + * In addition, this class provides many methods for
1.38 + * converting a {@code boolean} to a {@code String} and a
1.39 + * {@code String} to a {@code boolean}, as well as other
1.40 + * constants and methods useful when dealing with a
1.41 + * {@code boolean}.
1.42 + *
1.43 + * @author Arthur van Hoff
1.44 + * @since JDK1.0
1.45 + */
1.46 +public final class Boolean implements java.io.Serializable,
1.47 + Comparable<Boolean>
1.48 +{
1.49 + /**
1.50 + * The {@code Boolean} object corresponding to the primitive
1.51 + * value {@code true}.
1.52 + */
1.53 + public static final Boolean TRUE = new Boolean(true);
1.54 +
1.55 + /**
1.56 + * The {@code Boolean} object corresponding to the primitive
1.57 + * value {@code false}.
1.58 + */
1.59 + public static final Boolean FALSE = new Boolean(false);
1.60 +
1.61 + /**
1.62 + * The Class object representing the primitive type boolean.
1.63 + *
1.64 + * @since JDK1.1
1.65 + */
1.66 + public static final Class<Boolean> TYPE = Class.getPrimitiveClass("boolean");
1.67 +
1.68 + /**
1.69 + * The value of the Boolean.
1.70 + *
1.71 + * @serial
1.72 + */
1.73 + private final boolean value;
1.74 +
1.75 + /** use serialVersionUID from JDK 1.0.2 for interoperability */
1.76 + private static final long serialVersionUID = -3665804199014368530L;
1.77 +
1.78 + /**
1.79 + * Allocates a {@code Boolean} object representing the
1.80 + * {@code value} argument.
1.81 + *
1.82 + * <p><b>Note: It is rarely appropriate to use this constructor.
1.83 + * Unless a <i>new</i> instance is required, the static factory
1.84 + * {@link #valueOf(boolean)} is generally a better choice. It is
1.85 + * likely to yield significantly better space and time performance.</b>
1.86 + *
1.87 + * @param value the value of the {@code Boolean}.
1.88 + */
1.89 + public Boolean(boolean value) {
1.90 + this.value = value;
1.91 + }
1.92 +
1.93 + /**
1.94 + * Allocates a {@code Boolean} object representing the value
1.95 + * {@code true} if the string argument is not {@code null}
1.96 + * and is equal, ignoring case, to the string {@code "true"}.
1.97 + * Otherwise, allocate a {@code Boolean} object representing the
1.98 + * value {@code false}. Examples:<p>
1.99 + * {@code new Boolean("True")} produces a {@code Boolean} object
1.100 + * that represents {@code true}.<br>
1.101 + * {@code new Boolean("yes")} produces a {@code Boolean} object
1.102 + * that represents {@code false}.
1.103 + *
1.104 + * @param s the string to be converted to a {@code Boolean}.
1.105 + */
1.106 + public Boolean(String s) {
1.107 + this(toBoolean(s));
1.108 + }
1.109 +
1.110 + /**
1.111 + * Parses the string argument as a boolean. The {@code boolean}
1.112 + * returned represents the value {@code true} if the string argument
1.113 + * is not {@code null} and is equal, ignoring case, to the string
1.114 + * {@code "true"}. <p>
1.115 + * Example: {@code Boolean.parseBoolean("True")} returns {@code true}.<br>
1.116 + * Example: {@code Boolean.parseBoolean("yes")} returns {@code false}.
1.117 + *
1.118 + * @param s the {@code String} containing the boolean
1.119 + * representation to be parsed
1.120 + * @return the boolean represented by the string argument
1.121 + * @since 1.5
1.122 + */
1.123 + public static boolean parseBoolean(String s) {
1.124 + return toBoolean(s);
1.125 + }
1.126 +
1.127 + /**
1.128 + * Returns the value of this {@code Boolean} object as a boolean
1.129 + * primitive.
1.130 + *
1.131 + * @return the primitive {@code boolean} value of this object.
1.132 + */
1.133 + public boolean booleanValue() {
1.134 + return value;
1.135 + }
1.136 +
1.137 + /**
1.138 + * Returns a {@code Boolean} instance representing the specified
1.139 + * {@code boolean} value. If the specified {@code boolean} value
1.140 + * is {@code true}, this method returns {@code Boolean.TRUE};
1.141 + * if it is {@code false}, this method returns {@code Boolean.FALSE}.
1.142 + * If a new {@code Boolean} instance is not required, this method
1.143 + * should generally be used in preference to the constructor
1.144 + * {@link #Boolean(boolean)}, as this method is likely to yield
1.145 + * significantly better space and time performance.
1.146 + *
1.147 + * @param b a boolean value.
1.148 + * @return a {@code Boolean} instance representing {@code b}.
1.149 + * @since 1.4
1.150 + */
1.151 + public static Boolean valueOf(boolean b) {
1.152 + return (b ? TRUE : FALSE);
1.153 + }
1.154 +
1.155 + /**
1.156 + * Returns a {@code Boolean} with a value represented by the
1.157 + * specified string. The {@code Boolean} returned represents a
1.158 + * true value if the string argument is not {@code null}
1.159 + * and is equal, ignoring case, to the string {@code "true"}.
1.160 + *
1.161 + * @param s a string.
1.162 + * @return the {@code Boolean} value represented by the string.
1.163 + */
1.164 + public static Boolean valueOf(String s) {
1.165 + return toBoolean(s) ? TRUE : FALSE;
1.166 + }
1.167 +
1.168 + /**
1.169 + * Returns a {@code String} object representing the specified
1.170 + * boolean. If the specified boolean is {@code true}, then
1.171 + * the string {@code "true"} will be returned, otherwise the
1.172 + * string {@code "false"} will be returned.
1.173 + *
1.174 + * @param b the boolean to be converted
1.175 + * @return the string representation of the specified {@code boolean}
1.176 + * @since 1.4
1.177 + */
1.178 + public static String toString(boolean b) {
1.179 + return b ? "true" : "false";
1.180 + }
1.181 +
1.182 + /**
1.183 + * Returns a {@code String} object representing this Boolean's
1.184 + * value. If this object represents the value {@code true},
1.185 + * a string equal to {@code "true"} is returned. Otherwise, a
1.186 + * string equal to {@code "false"} is returned.
1.187 + *
1.188 + * @return a string representation of this object.
1.189 + */
1.190 + public String toString() {
1.191 + return value ? "true" : "false";
1.192 + }
1.193 +
1.194 + /**
1.195 + * Returns a hash code for this {@code Boolean} object.
1.196 + *
1.197 + * @return the integer {@code 1231} if this object represents
1.198 + * {@code true}; returns the integer {@code 1237} if this
1.199 + * object represents {@code false}.
1.200 + */
1.201 + public int hashCode() {
1.202 + return value ? 1231 : 1237;
1.203 + }
1.204 +
1.205 + /**
1.206 + * Returns {@code true} if and only if the argument is not
1.207 + * {@code null} and is a {@code Boolean} object that
1.208 + * represents the same {@code boolean} value as this object.
1.209 + *
1.210 + * @param obj the object to compare with.
1.211 + * @return {@code true} if the Boolean objects represent the
1.212 + * same value; {@code false} otherwise.
1.213 + */
1.214 + public boolean equals(Object obj) {
1.215 + if (obj instanceof Boolean) {
1.216 + return value == ((Boolean)obj).booleanValue();
1.217 + }
1.218 + return false;
1.219 + }
1.220 +
1.221 + /**
1.222 + * Returns {@code true} if and only if the system property
1.223 + * named by the argument exists and is equal to the string
1.224 + * {@code "true"}. (Beginning with version 1.0.2 of the
1.225 + * Java<small><sup>TM</sup></small> platform, the test of
1.226 + * this string is case insensitive.) A system property is accessible
1.227 + * through {@code getProperty}, a method defined by the
1.228 + * {@code System} class.
1.229 + * <p>
1.230 + * If there is no property with the specified name, or if the specified
1.231 + * name is empty or null, then {@code false} is returned.
1.232 + *
1.233 + * @param name the system property name.
1.234 + * @return the {@code boolean} value of the system property.
1.235 + * @see java.lang.System#getProperty(java.lang.String)
1.236 + * @see java.lang.System#getProperty(java.lang.String, java.lang.String)
1.237 + */
1.238 + public static boolean getBoolean(String name) {
1.239 + boolean result = false;
1.240 + try {
1.241 + result = toBoolean(AbstractStringBuilder.getProperty(name));
1.242 + } catch (IllegalArgumentException e) {
1.243 + } catch (NullPointerException e) {
1.244 + }
1.245 + return result;
1.246 + }
1.247 +
1.248 + /**
1.249 + * Compares this {@code Boolean} instance with another.
1.250 + *
1.251 + * @param b the {@code Boolean} instance to be compared
1.252 + * @return zero if this object represents the same boolean value as the
1.253 + * argument; a positive value if this object represents true
1.254 + * and the argument represents false; and a negative value if
1.255 + * this object represents false and the argument represents true
1.256 + * @throws NullPointerException if the argument is {@code null}
1.257 + * @see Comparable
1.258 + * @since 1.5
1.259 + */
1.260 + public int compareTo(Boolean b) {
1.261 + return compare(this.value, b.value);
1.262 + }
1.263 +
1.264 + /**
1.265 + * Compares two {@code boolean} values.
1.266 + * The value returned is identical to what would be returned by:
1.267 + * <pre>
1.268 + * Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
1.269 + * </pre>
1.270 + *
1.271 + * @param x the first {@code boolean} to compare
1.272 + * @param y the second {@code boolean} to compare
1.273 + * @return the value {@code 0} if {@code x == y};
1.274 + * a value less than {@code 0} if {@code !x && y}; and
1.275 + * a value greater than {@code 0} if {@code x && !y}
1.276 + * @since 1.7
1.277 + */
1.278 + public static int compare(boolean x, boolean y) {
1.279 + return (x == y) ? 0 : (x ? 1 : -1);
1.280 + }
1.281 +
1.282 + private static boolean toBoolean(String name) {
1.283 + return ((name != null) && name.equalsIgnoreCase("true"));
1.284 + }
1.285 +}