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package com.sun.faces.util.copier;
import static com.sun.faces.util.ReflectionUtils.instance;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.faces.context.FacesContext;
public class CopierUtils {
private static final String ERROR_COPIER_NAME = "The copier name should be a Java valid simple/qualified name.";
private static final String COPIER_PREFIX = "com.sun.faces.util.copier.";
private final static Set<String> keywords;
static {
Set<String> s = new HashSet<String>();
String[] kws = {
"abstract", "continue", "for", "new", "switch",
"assert", "default", "if", "package", "synchronized",
"boolean", "do", "goto", "private", "this",
"break", "double", "implements", "protected", "throw",
"byte", "else", "import", "public", "throws",
"case", "enum", "instanceof", "return", "transient",
"catch", "extends", "int", "short", "try",
"char", "final", "interface", "static", "void",
"class", "finally", "long", "strictfp", "volatile",
"const", "float", "native", "super", "while",
// literals
"null", "true", "false"
};
for (String kw : kws) {
s.add(kw);
}
keywords = Collections.unmodifiableSet(s);
}
public static Copier getCopier(FacesContext context, String copierType) {
Copier copier = null;
if (!isEmpty(copierType)) {
// TODO: or should validate only against {"MultiStrategyCopier", "SerializationCopier",
// "NewInstanceCopier", "CopyCtorCopier", "CloneCopier"} strings / enum
if (isCopierTypeSimpleName(copierType)) {
copierType = COPIER_PREFIX.concat(copierType);
} else if (!isName(copierType)) {
throw new IllegalArgumentException(ERROR_COPIER_NAME);
}
Object expressionResult = evaluateExpressionGet(context, copierType);
if (expressionResult instanceof Copier) {
copier = (Copier) expressionResult;
} else if (expressionResult instanceof String) {
copier = instance((String) expressionResult);
}
}
if (copier == null) {
copier = new MultiStrategyCopier();
}
return copier;
}
@SuppressWarnings("unchecked")
private static <T> T evaluateExpressionGet(FacesContext context, String expression) {
if (expression == null) {
return null;
}
return (T) context.getApplication().evaluateExpressionGet(context, expression, Object.class);
}
private static boolean isCopierTypeSimpleName(String copierType) {
return (isIdentifier(copierType) && !(isKeyword(copierType)));
}
// maybe the following four methods should be moved in com.sun.faces.util
private static boolean isEmpty(String string) {
return string == null || string.isEmpty();
}
private static boolean isName(CharSequence name) {
String id = name.toString();
for (String s : id.split("\\.", -1)) {
if (!isIdentifier(s) || isKeyword(s)) {
return false;
}
}
return true;
}
private static boolean isIdentifier(CharSequence name) {
String id = name.toString();
if (id.length() == 0) {
return false;
}
int cp = id.codePointAt(0);
if (!Character.isJavaIdentifierStart(cp)) {
return false;
}
for (int i = Character.charCount(cp);
i < id.length();
i += Character.charCount(cp)) {
cp = id.codePointAt(i);
if (!Character.isJavaIdentifierPart(cp)) {
return false;
}
}
return true;
}
private static boolean isKeyword(CharSequence s) {
String keywordOrLiteral = s.toString();
return keywords.contains(keywordOrLiteral);
}
}