added fullFormLexicon in Java

doc/runtime-api.html

@@ -775,7 +775,7 @@ word form with its possible analyses:
 Prelude PGF2> mapM_ print [(form,lemma,analysis,prob) | (form,analyses) <- fullFormLexicon eng, (lemma,analysis,prob) &lt- analyses]
 </pre>
 <pre class="java">
-for (FullFormEntry entry in eng.fullFormLexicon()) { ///// TODO
+for (FullFormEntry entry : eng.fullFormLexicon()) {
 	for (MorphoAnalysis analysis : entry.getAnalyses()) {
 		System.out.println(entry.getForm()+" "+analysis.getProb()+" "+analysis.getLemma()+" "+analysis.getField());
 	}

src/runtime/java/jpgf.c

@@ -1107,8 +1107,11 @@ Java_org_grammaticalframework_pgf_Lexicon_lookupWordPrefix
 	GuPool* pool = gu_new_pool();	
 	GuExn* err = gu_new_exn(pool);
 
-	GuEnum* en = pgf_lookup_word_prefix(get_ref(env, jconcr), j2gu_string(env, prefix, pool),
-	                                    pool, err);
+	GuEnum* en = 
+		(prefix == NULL) ? pgf_fullform_lexicon(get_ref(env, jconcr), 
+	                                            pool)
+	                     : pgf_lookup_word_prefix(get_ref(env, jconcr), j2gu_string(env, prefix, pool),
+	                                              pool, err);
 	if (!gu_ok(err)) {
 		if (gu_exn_caught(err, PgfExn)) {
 			GuString msg = (GuString) gu_exn_caught_data(err);

src/runtime/java/org/grammaticalframework/pgf/Concr.java

@@ -70,7 +70,9 @@ public class Concr {
 	public native List<MorphoAnalysis> lookupMorpho(String sentence);
 	
 	/** Creates an iterable over the full form lexicon in the grammar */
-	public native Iterable<FullFormEntry> fullFormLexicon();
+	public Iterable<FullFormEntry> fullFormLexicon() {
+		return new Lexicon(this, null);
+	}
 
 	/** Returns an iterable enumerating all words in the lexicon
 	 * starting with a given prefix.