1 files changed, 89 insertions, 0 deletions
diff --git a/java/src/json/ext/Utils.java b/java/src/json/ext/Utils.java
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+/*
+ * This code is copyrighted work by Daniel Luz <dev at mernen dot com>.
+ * 
+ * Distributed under the Ruby and GPLv2 licenses; see COPYING and GPL files
+ * for details.
+ */
+package json.ext;
+
+import org.jruby.Ruby;
+import org.jruby.RubyArray;
+import org.jruby.RubyClass;
+import org.jruby.RubyException;
+import org.jruby.RubyHash;
+import org.jruby.RubyString;
+import org.jruby.exceptions.RaiseException;
+import org.jruby.runtime.Block;
+import org.jruby.runtime.ThreadContext;
+import org.jruby.runtime.builtin.IRubyObject;
+import org.jruby.util.ByteList;
+
+/**
+ * Library of miscellaneous utility functions
+ */
+final class Utils {
+    public static final String M_GENERATOR_ERROR = "GeneratorError";
+    public static final String M_NESTING_ERROR = "NestingError";
+    public static final String M_PARSER_ERROR = "ParserError";
+
+    private Utils() {
+        throw new RuntimeException();
+    }
+
+    /**
+     * Safe {@link RubyArray} type-checking.
+     * Returns the given object if it is an <code>Array</code>,
+     * or throws an exception if not.
+     * @param object The object to test
+     * @return The given object if it is an <code>Array</code>
+     * @throws RaiseException <code>TypeError</code> if the object is not
+     *                        of the expected type
+     */
+    static RubyArray ensureArray(IRubyObject object) throws RaiseException {
+        if (object instanceof RubyArray) return (RubyArray)object;
+        Ruby runtime = object.getRuntime();
+        throw runtime.newTypeError(object, runtime.getArray());
+    }
+
+    static RubyHash ensureHash(IRubyObject object) throws RaiseException {
+        if (object instanceof RubyHash) return (RubyHash)object;
+        Ruby runtime = object.getRuntime();
+        throw runtime.newTypeError(object, runtime.getHash());
+    }
+
+    static RubyString ensureString(IRubyObject object) throws RaiseException {
+        if (object instanceof RubyString) return (RubyString)object;
+        Ruby runtime = object.getRuntime();
+        throw runtime.newTypeError(object, runtime.getString());
+    }
+
+    static RaiseException newException(ThreadContext context,
+                                       String className, String message) {
+        return newException(context, className,
+                            context.getRuntime().newString(message));
+    }
+
+    static RaiseException newException(ThreadContext context,
+                                       String className, RubyString message) {
+        RuntimeInfo info = RuntimeInfo.forRuntime(context.getRuntime());
+        RubyClass klazz = info.jsonModule.getClass(className);
+        RubyException excptn =
+            (RubyException)klazz.newInstance(context,
+                new IRubyObject[] {message}, Block.NULL_BLOCK);
+        return new RaiseException(excptn);
+    }
+
+    static byte[] repeat(ByteList a, int n) {
+        return repeat(a.unsafeBytes(), a.begin(), a.length(), n);
+    }
+
+    static byte[] repeat(byte[] a, int begin, int length, int n) {
+        if (length == 0) return ByteList.NULL_ARRAY;
+        int resultLen = length * n;
+        byte[] result = new byte[resultLen];
+        for (int pos = 0; pos < resultLen; pos += length) {
+            System.arraycopy(a, begin, result, pos, length);
+        }
+        return result;
+    }
+}