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v4 tool: 

* StringBuilder instead of StringBuffer
* Add Utils.setSize for List<?>
* Use Func1<T, TResult> "delegate" instead of reflection for Utils.apply (and rename apply to select to suggest a return value)

[git-p4: depot-paths = "//depot/code/antlr4/main/": change = 9272]
This commit is contained in:
sharwell 2011-11-10 07:58:00 -08:00
parent 3a8ab7f859
commit 26d5d5c9c0
1 changed files with 22 additions and 10 deletions
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32
tool/src/org/antlr/v4/misc/Utils.java
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@ -45,6 +45,14 @@ public class Utils {
boolean select(T t); boolean select(T t);
} }
public interface Func0<TResult> {
TResult exec();
}
public interface Func1<T1, TResult> {
TResult exec(T1 arg1);
}
static Integer[] ints = new Integer[INTEGER_POOL_MAX_VALUE+1]; static Integer[] ints = new Integer[INTEGER_POOL_MAX_VALUE+1];
/** Integer objects are immutable so share all Integers with the /** Integer objects are immutable so share all Integers with the
@ -103,7 +111,7 @@ public class Utils {
uses regex (I only want to play with strings anyway). uses regex (I only want to play with strings anyway).
*/ */
public static String replace(String src, String replacee, String replacer) { public static String replace(String src, String replacee, String replacer) {
StringBuffer result = new StringBuffer(src.length() + 50); StringBuilder result = new StringBuilder(src.length() + 50);
int startIndex = 0; int startIndex = 0;
int endIndex = src.indexOf(replacee); int endIndex = src.indexOf(replacee);
while(endIndex != -1) { while(endIndex != -1) {
@ -122,7 +130,7 @@ public class Utils {
String lines[] = s.split("\n"); String lines[] = s.split("\n");
Arrays.sort(lines); Arrays.sort(lines);
List<String> linesL = Arrays.asList(lines); List<String> linesL = Arrays.asList(lines);
StringBuffer buf = new StringBuffer(); StringBuilder buf = new StringBuilder();
for (String l : linesL) { for (String l : linesL) {
buf.append(l); buf.append(l);
buf.append('\n'); buf.append('\n');
@ -164,17 +172,11 @@ public class Utils {
/** apply methodName to list and return list of results. method has /** apply methodName to list and return list of results. method has
* no args. This pulls data out of a list essentially. * no args. This pulls data out of a list essentially.
*/ */
public static <From,To> List<To> apply(List<From> list, String methodName) { public static <From,To> List<To> select(List<From> list, Func1<From, To> selector) {
if ( list==null ) return null; if ( list==null ) return null;
List<To> b = new ArrayList<To>(); List<To> b = new ArrayList<To>();
for (From f : list) { for (From f : list) {
try { b.add(method.exec(f));
Method m = f.getClass().getMethod(methodName, (Class[])null);
b.add( (To)m.invoke(f, (Object[])null) );
}
catch (Exception e) {
e.printStackTrace(System.err);
}
} }
return b; return b;
} }
@ -202,4 +204,14 @@ public class Utils {
return -1; return -1;
} }
public static void setSize(List<?> list, int size) {
if (size < list.size()) {
list.subList(size, list.size()).clear();
} else {
while (size > list.size()) {
list.add(null);
}
}
}
} }