public ArrayPathElement(String key) {
super(key);
if (key.charAt(0) != '[' || key.charAt(key.length() - 1) != ']') {
throw new SpecException("Invalid ArrayPathElement key:" + key);
}
ArrayPathType apt;
PathReference r = null;
TransposePathElement tpe = null;
String aI = "";
if (key.length() == 2) {
apt = ArrayPathType.AUTO_EXPAND;
canonicalForm = "[]";
} else {
String meat = key.substring(1, key.length() - 1); // trim the [ ]
char firstChar = meat.charAt(0);
if (AmpReference.TOKEN.equals(firstChar)) {
r = new AmpReference(meat);
apt = ArrayPathType.REFERENCE;
canonicalForm = "[" + r.getCanonicalForm() + "]";
} else if (HashReference.TOKEN.equals(firstChar)) {
r = new HashReference(meat);
apt = ArrayPathType.HASH;
canonicalForm = "[" + r.getCanonicalForm() + "]";
} else if ('@' == firstChar) {
apt = ArrayPathType.TRANSPOSE;
tpe = TransposePathElement.parse(meat);
canonicalForm = "[" + tpe.getCanonicalForm() + "]";
} else {
aI = verifyStringIsNonNegativeInteger(meat);
if (aI != null) {
apt = ArrayPathType.EXPLICIT_INDEX;
canonicalForm = "[" + aI + "]";
} else {
throw new SpecException("Bad explict array index:" + meat + " from key:" + key);
}
}
}
transposePathElement = tpe;
arrayPathType = apt;
ref = r;
arrayIndex = aI;
}
@Override
public String evaluate(WalkedPath walkedPath) {
switch (arrayPathType) {
case AUTO_EXPAND:
return canonicalForm;
case EXPLICIT_INDEX:
return arrayIndex;
case HASH:
LiteralPathElement element =
walkedPath.elementFromEnd(ref.getPathIndex()).getLiteralPathElement();
Integer index = element.getHashCount();
return index.toString();
case TRANSPOSE:
String key = transposePathElement.evaluate(walkedPath);
return verifyStringIsNonNegativeInteger(key);
case REFERENCE:
LiteralPathElement lpe =
walkedPath.elementFromEnd(ref.getPathIndex()).getLiteralPathElement();
String keyPart;
if (ref instanceof PathAndGroupReference) {
keyPart = lpe.getSubKeyRef(((PathAndGroupReference) ref).getKeyGroup());
} else {
keyPart = lpe.getSubKeyRef(0);
}
return verifyStringIsNonNegativeInteger(keyPart);
default:
throw new IllegalStateException(
"ArrayPathType enum added two without updating this switch statement.");
}
}