/*
*******************************************************************************
* Copyright (C) 2002-2004, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.dev.test.util;
import java.util.*;
import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.text.UnicodeSetIterator;
public abstract class Visitor {
public void doAt(Object item) {
if (item instanceof Collection) {
doAt((Collection) item);
} else if (item instanceof Map) {
doAt((Map) item);
} else if (item instanceof Object[]) {
doAt((Object[]) item);
} else if (item instanceof UnicodeSet) {
doAt((UnicodeSet) item);
} else {
doSimpleAt(item);
}
}
public int count(Object item) {
if (item instanceof Collection) {
return ((Collection) item).size();
} else if (item instanceof Map) {
return ((Map) item).size();
} else if (item instanceof Object[]) {
return ((Object[]) item).length;
} else if (item instanceof UnicodeSet) {
return ((UnicodeSet) item).size();
} else {
return 1;
}
}
// the default implementation boxing
public void doAt(int o) {
doSimpleAt(new Integer(o));
}
public void doAt(double o) {
doSimpleAt(new Double(o));
}
public void doAt(char o) {
doSimpleAt(new Character(o));
}
// for subclassing
protected void doAt (Collection c) {
if (c.size() == 0) doBefore(c, null);
Iterator it = c.iterator();
boolean first = true;
Object last = null;
while (it.hasNext()) {
Object item = it.next();
if (first) {
doBefore(c, item);
first = false;
} else {
doBetween(c, last, item);
}
doAt(last=item);
}
doAfter(c, last);
}
protected void doAt (Map c) {
doAt(c.entrySet());
}
protected void doAt (UnicodeSet c) {
if (c.size() == 0) doBefore(c, null);
UnicodeSetIterator it = new UnicodeSetIterator(c);
boolean first = true;
Object last = null;
Object item;
CodePointRange cpr0 = new CodePointRange();
CodePointRange cpr1 = new CodePointRange();
CodePointRange cpr;
while(it.nextRange()) {
if (it.codepoint == UnicodeSetIterator.IS_STRING) {
item = it.string;
} else {
cpr = last == cpr0 ? cpr1 : cpr0; // make sure we don't override last
cpr.codepoint = it.codepoint;
cpr.codepointEnd = it.codepointEnd;
item = cpr;
}
if (!first) {
doBefore(c, item);
first = true;
} else {
doBetween(c, last, item);
}
doAt(last = item);
}
doAfter(c, last);
}
protected void doAt (Object[] c) {
doBefore(c, c.length == 0 ? null : c[0]);
Object last = null;
for (int i = 0; i < c.length; ++i) {
if (i != 0) doBetween(c, last, c[i]);
doAt(last = c[i]);
}
doAfter(c, last);
}
public static class CodePointRange{
public int codepoint, codepointEnd;
}
// ===== MUST BE OVERRIDEN =====
abstract protected void doBefore(Object container, Object item);
abstract protected void doBetween(Object container, Object lastItem, Object nextItem);
abstract protected void doAfter(Object container, Object item);
abstract protected void doSimpleAt(Object o);
}