99 lines
2.5 KiB
Java
99 lines
2.5 KiB
Java
/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.lang;
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import java.io.Serializable;
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/**
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* @author Warren Levy <warrenl@cygnus.com>
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* @date September 3, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct.
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*/
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public final class Boolean extends Object implements Serializable
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{
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public static final Boolean FALSE = new Boolean(false);
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public static final Boolean TRUE = new Boolean(true);
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// This initialization is seemingly circular, but it is accepted
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// by javac, and is handled specially by gcc.
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public static final Class TYPE = boolean.class;
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/* The boolean value of the instance. */
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private boolean value;
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public Boolean(boolean boolVal)
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{
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value = boolVal;
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}
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public Boolean(String strVal)
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{
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value = (strVal == null ? false : strVal.equalsIgnoreCase("true"));
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}
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public boolean booleanValue()
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{
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return value;
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}
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public boolean equals(Object obj)
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{
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/* Don't need to compare obj to null as instanceof will do this. */
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if (obj instanceof Boolean)
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return value == ((Boolean) obj).value;
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return false;
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}
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public static boolean getBoolean(String property)
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{
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/* TBD: If a security manager exists and it doesn't permit accessing
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* the property, it will throw an exception. Should we catch it?
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*/
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try
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{
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String val = System.getProperty(property);
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return val == null ? false : val.equalsIgnoreCase("true");
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}
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catch (SecurityException e)
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{
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return false;
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}
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}
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public int hashCode()
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{
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/* These values are from the Java Lang. Spec. (Sec 20.4.7).
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* TBD: They could be made private static final fields but they're only
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* used here (and shouldn't be used anywhere else), though it might be
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* useful to grep on something like JAVA_HASH_* values for us as
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* developers.
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*/
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return value ? 1231 : 1237;
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}
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public String toString()
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{
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return value ? "true" : "false";
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}
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public static Boolean valueOf(String str)
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{
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if (str == null)
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return FALSE;
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else
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/* This returns a Boolean (big B), not a boolean (little b). */
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return str.equalsIgnoreCase("true") ? TRUE : FALSE;
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}
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}
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