Add a very rudimentary command line program that will check the integrity (a very basic integrity check) of a world.

src/joptsimple/util/KeyValuePair.java

@@ -0,0 +1,84 @@
+/*
+ The MIT License
+
+ Copyright (c) 2009 Paul R. Holser, Jr.
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+package joptsimple.util;
+
+import static joptsimple.internal.Strings.*;
+
+/**
+ * <p>A simple string key/string value pair.</p>
+ *
+ * <p>This is useful as an argument type for options whose values take on the form
+ * <kbd>key=value</kbd>, such as JVM command line system properties.</p>
+ *
+ * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>
+ * @version $Id: KeyValuePair.java,v 1.10 2009/10/25 18:37:09 pholser Exp $
+ */
+public final class KeyValuePair {
+    public final String key;
+    public final String value;
+
+    private KeyValuePair( String key, String value ) {
+        this.key = key;
+        this.value = value;
+    }
+
+    /**
+     * Parses a string assumed to be of the form <kbd>key=value</kbd> into its parts.
+     *
+     * @param asString key-value string
+     * @return a key-value pair
+     * @throws NullPointerException if {@code stringRepresentation} is {@code null}
+     */
+    public static KeyValuePair valueOf( String asString ) {
+        int equalsIndex = asString.indexOf( '=' );
+        if ( equalsIndex == -1 )
+            return new KeyValuePair( asString, EMPTY );
+
+        String aKey = asString.substring( 0, equalsIndex );
+        String aValue = equalsIndex == asString.length() - 1 ? EMPTY : asString.substring( equalsIndex + 1 );
+
+        return new KeyValuePair( aKey, aValue );
+    }
+
+    @Override
+    public boolean equals( Object that ) {
+        if ( !( that instanceof KeyValuePair ) )
+            return false;
+
+        KeyValuePair other = (KeyValuePair) that;
+        return key.equals( other.key ) && value.equals( other.value );
+    }
+
+    @Override
+    public int hashCode() {
+        return key.hashCode() ^ value.hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return key + '=' + value;
+    }
+}