Examples with SymbolTable org.opennms.core.utils.PropertiesUtils.SymbolTable used on opensource projects

Example 1 with SymbolTable

use of org.opennms.core.utils.PropertiesUtils.SymbolTable in project opennms by OpenNMS.

the class GenericIndexResourceType method getResourceByPath.

public OnmsResource getResourceByPath(final ResourcePath path, final OnmsResource parent) {
    final Set<OnmsAttribute> set = new LazySet<OnmsAttribute>(new LazyResourceAttributeLoader(m_resourceStorageDao, path));
    final String index = path.getName();
    String label;
    if (m_resourceLabelExpression == null) {
        label = index;
    } else {
        SymbolTable symbolTable = new SymbolTable() {

            private int lastN;

            private boolean lastNSet = false;

            @Override
            public String getSymbolValue(String symbol) {
                if (symbol.equals("index")) {
                    return index;
                }
                Matcher subIndexMatcher = SUB_INDEX_PATTERN.matcher(symbol);
                if (subIndexMatcher.matches()) {
                    Matcher subIndexArgumentsMatcher = SUB_INDEX_ARGUMENTS_PATTERN.matcher(subIndexMatcher.group(1));
                    if (!subIndexArgumentsMatcher.matches()) {
                        // Invalid arguments
                        return null;
                    }
                    List<String> indexElements = tokenizeIndex(index);
                    int start;
                    int offset;
                    if ("n".equals(subIndexArgumentsMatcher.group(1)) && lastNSet) {
                        start = lastN;
                        lastNSet = false;
                    } else if ("n".equals(subIndexArgumentsMatcher.group(1))) {
                        // Invalid use of "n" when lastN is not set
                        return null;
                    } else {
                        offset = Integer.parseInt(subIndexArgumentsMatcher.group(1));
                        if (offset < 0) {
                            start = indexElements.size() + offset;
                        } else {
                            start = offset;
                        }
                    }
                    int end;
                    if ("n".equals(subIndexArgumentsMatcher.group(2))) {
                        end = start + Integer.parseInt(indexElements.get(start)) + 1;
                        start++;
                        lastN = end;
                        lastNSet = true;
                    } else {
                        if (subIndexArgumentsMatcher.group(2) == null) {
                            end = indexElements.size();
                        } else {
                            end = start + Integer.parseInt(subIndexArgumentsMatcher.group(2));
                        }
                    }
                    if (start < 0 || start >= indexElements.size()) {
                        // Bogus index start
                        return null;
                    }
                    if (end < 0 || end > indexElements.size()) {
                        // Bogus index end
                        return null;
                    }
                    StringBuffer indexSubString = new StringBuffer();
                    for (int i = start; i < end; i++) {
                        if (indexSubString.length() != 0) {
                            indexSubString.append(".");
                        }
                        indexSubString.append(indexElements.get(i));
                    }
                    return indexSubString.toString();
                }
                Matcher hexMatcher = HEX_PATTERN.matcher(symbol);
                if (hexMatcher.matches()) {
                    String subSymbol = getSymbolValue(hexMatcher.group(1));
                    List<String> indexElements = tokenizeIndex(subSymbol);
                    StringBuffer hexString = new StringBuffer();
                    for (String indexElement : indexElements) {
                        if (hexString.length() > 0) {
                            hexString.append(":");
                        }
                        try {
                            hexString.append(String.format("%02X", Integer.parseInt(indexElement)));
                        } catch (NumberFormatException e) {
                            return null;
                        }
                    }
                    return hexString.toString();
                }
                Matcher stringMatcher = STRING_PATTERN.matcher(symbol);
                if (stringMatcher.matches()) {
                    String subSymbol = getSymbolValue(stringMatcher.group(1));
                    List<String> indexElements = tokenizeIndex(subSymbol);
                    StringBuffer stringString = new StringBuffer();
                    for (String indexElement : indexElements) {
                        stringString.append(String.format("%c", Integer.parseInt(indexElement)));
                    }
                    return stringString.toString();
                }
                for (OnmsAttribute attr : set) {
                    if (symbol.equals(attr.getName())) {
                        if (StringPropertyAttribute.class.isAssignableFrom(attr.getClass())) {
                            StringPropertyAttribute stringAttr = (StringPropertyAttribute) attr;
                            return stringAttr.getValue();
                        }
                        if (ExternalValueAttribute.class.isAssignableFrom(attr.getClass())) {
                            ExternalValueAttribute extAttr = (ExternalValueAttribute) attr;
                            return extAttr.getValue();
                        }
                    }
                }
                return null;
            }

            private List<String> tokenizeIndex(final String index) {
                List<String> indexElements = new ArrayList<String>();
                StringTokenizer t = new StringTokenizer(index, ".");
                while (t.hasMoreTokens()) {
                    indexElements.add(t.nextToken());
                }
                return indexElements;
            }
        };
        label = PropertiesUtils.substitute(m_resourceLabelExpression, symbolTable);
    }
    final OnmsResource resource = new OnmsResource(index, label, this, set, path);
    resource.setParent(parent);
    return resource;
}