org.apache.jasper.compiler.JspUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper.compiler;
import static org.apache.jasper.JasperMessages.MESSAGES;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Vector;
import org.apache.jasper.Constants;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.tomcat.util.scan.Jar;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
/**
* This class has all the utility method(s). Ideally should move all the bean
* containers here.
*
* @author Mandar Raje.
* @author Rajiv Mordani.
* @author Danno Ferrin
* @author Pierre Delisle
* @author Shawn Bayern
* @author Mark Roth
*/
public class JspUtil {
private static final String WEB_INF_TAGS = "/WEB-INF/tags/";
private static final String META_INF_TAGS = "/META-INF/tags/";
// Delimiters for request-time expressions (JSP and XML syntax)
private static final String OPEN_EXPR = "<%=";
private static final String CLOSE_EXPR = "%>";
private static final String javaKeywords[] = { "abstract", "assert",
"boolean", "break", "byte", "case", "catch", "char", "class",
"const", "continue", "default", "do", "double", "else", "enum",
"extends", "final", "finally", "float", "for", "goto", "if",
"implements", "import", "instanceof", "int", "interface", "long",
"native", "new", "package", "private", "protected", "public",
"return", "short", "static", "strictfp", "super", "switch",
"synchronized", "this", "throw", "throws", "transient", "try",
"void", "volatile", "while" };
static final int JSP_INPUT_STREAM_BUFFER_SIZE = 1024;
public static final int CHUNKSIZE = 1024;
/**
* Takes a potential expression and converts it into XML form.
* @param expression The expression to convert
* @return XML view
*/
public static String getExprInXml(String expression) {
String returnString;
int length = expression.length();
if (expression.startsWith(OPEN_EXPR) &&
expression.endsWith(CLOSE_EXPR)) {
returnString = expression.substring(1, length - 1);
} else {
returnString = expression;
}
return escapeXml(returnString);
}
/**
* Checks to see if the given scope is valid.
*
* @param scope
* The scope to be checked
* @param n
* The Node containing the 'scope' attribute whose value is to be
* checked
* @param err
* error dispatcher
*
* @throws JasperException
* if scope is not null and different from "page",
* "request", "session", and
* "application"
*/
public static void checkScope(String scope, Node n, ErrorDispatcher err)
throws JasperException {
if (scope != null && !scope.equals("page") && !scope.equals("request")
&& !scope.equals("session") && !scope.equals("application")) {
err.jspError(n, MESSAGES.invalidScope(scope));
}
}
/**
* Checks if all mandatory attributes are present and if all attributes
* present have valid names. Checks attributes specified as XML-style
* attributes as well as attributes specified using the jsp:attribute
* standard action.
* @param typeOfTag The tag type
* @param n The corresponding node
* @param validAttributes The array with the valid attributes
* @param err Dispatcher for errors
* @throws JasperException An error occurred
*/
public static void checkAttributes(String typeOfTag, Node n,
ValidAttribute[] validAttributes, ErrorDispatcher err)
throws JasperException {
Attributes attrs = n.getAttributes();
Mark start = n.getStart();
boolean valid = true;
// AttributesImpl.removeAttribute is broken, so we do this...
int tempLength = (attrs == null) ? 0 : attrs.getLength();
Vector temp = new Vector<>(tempLength, 1);
for (int i = 0; i < tempLength; i++) {
@SuppressWarnings("null") // If attrs==null, tempLength == 0
String qName = attrs.getQName(i);
if ((!qName.equals("xmlns")) && (!qName.startsWith("xmlns:"))) {
temp.addElement(qName);
}
}
// Add names of attributes specified using jsp:attribute
Node.Nodes tagBody = n.getBody();
if (tagBody != null) {
int numSubElements = tagBody.size();
for (int i = 0; i < numSubElements; i++) {
Node node = tagBody.getNode(i);
if (node instanceof Node.NamedAttribute) {
String attrName = node.getAttributeValue("name");
temp.addElement(attrName);
// Check if this value appear in the attribute of the node
if (n.getAttributeValue(attrName) != null) {
err.jspError(n, MESSAGES.duplicateAttribute(attrName));
}
} else {
// Nothing can come before jsp:attribute, and only
// jsp:body can come after it.
break;
}
}
}
/*
* First check to see if all the mandatory attributes are present. If so
* only then proceed to see if the other attributes are valid for the
* particular tag.
*/
String missingAttribute = null;
for (int i = 0; i < validAttributes.length; i++) {
int attrPos;
if (validAttributes[i].mandatory) {
attrPos = temp.indexOf(validAttributes[i].name);
if (attrPos != -1) {
temp.remove(attrPos);
valid = true;
} else {
valid = false;
missingAttribute = validAttributes[i].name;
break;
}
}
}
// If mandatory attribute is missing then the exception is thrown
if (!valid)
err.jspError(start, MESSAGES.missingMandatoryAttribute(typeOfTag, missingAttribute));
// Check to see if there are any more attributes for the specified tag.
int attrLeftLength = temp.size();
if (attrLeftLength == 0) {
return;
}
// Now check to see if the rest of the attributes are valid too.
String attribute = null;
for (int j = 0; j < attrLeftLength; j++) {
valid = false;
attribute = temp.elementAt(j);
for (int i = 0; i < validAttributes.length; i++) {
if (attribute.equals(validAttributes[i].name)) {
valid = true;
break;
}
}
if (!valid) {
err.jspError(start, "jsp.error.invalid.attribute", typeOfTag,
attribute);
}
}
// XXX *could* move EL-syntax validation here... (sb)
}
/**
* Escape the 5 entities defined by XML.
* @param s String to escape
* @return XML escaped string
*/
public static String escapeXml(String s) {
if (s == null) {
return null;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == '<') {
sb.append("<");
} else if (c == '>') {
sb.append(">");
} else if (c == '\'') {
sb.append("'");
} else if (c == '&') {
sb.append("&");
} else if (c == '"') {
sb.append(""");
} else {
sb.append(c);
}
}
return sb.toString();
}
public static class ValidAttribute {
private final String name;
private final boolean mandatory;
public ValidAttribute(String name, boolean mandatory) {
this.name = name;
this.mandatory = mandatory;
}
public ValidAttribute(String name) {
this(name, false);
}
}
/**
* Convert a String value to 'boolean'. Besides the standard conversions
* done by Boolean.parseBoolean(s), the value "yes" (ignore case)
* is also converted to 'true'. If 's' is null, then 'false' is returned.
*
* @param s
* the string to be converted
* @return the boolean value associated with the string s
*/
public static boolean booleanValue(String s) {
boolean b = false;
if (s != null) {
if (s.equalsIgnoreCase("yes")) {
b = true;
} else {
b = Boolean.parseBoolean(s);
}
}
return b;
}
/**
* Returns the Class object associated with the class or
* interface with the given string name.
*
*
* The Class object is determined by passing the given string
* name to the Class.forName() method, unless the given string
* name represents a primitive type, in which case it is converted to a
* Class object by appending ".class" to it (e.g., "int.class").
* @param type The class name, array or primitive type
* @param loader The class loader
* @return the loaded class
* @throws ClassNotFoundException Loading class failed
*/
public static Class toClass(String type, ClassLoader loader)
throws ClassNotFoundException {
Class c = null;
int i0 = type.indexOf('[');
int dims = 0;
if (i0 > 0) {
// This is an array. Count the dimensions
for (int i = 0; i < type.length(); i++) {
if (type.charAt(i) == '[') {
dims++;
}
}
type = type.substring(0, i0);
}
if ("boolean".equals(type)) {
c = boolean.class;
} else if ("char".equals(type)) {
c = char.class;
} else if ("byte".equals(type)) {
c = byte.class;
} else if ("short".equals(type)) {
c = short.class;
} else if ("int".equals(type)) {
c = int.class;
} else if ("long".equals(type)) {
c = long.class;
} else if ("float".equals(type)) {
c = float.class;
} else if ("double".equals(type)) {
c = double.class;
} else if ("void".equals(type)) {
c = void.class;
} else if (type.indexOf('[') < 0) {
c = loader.loadClass(type);
}
if (dims == 0) {
return c;
}
if (dims == 1) {
return java.lang.reflect.Array.newInstance(c, 1).getClass();
}
// Array of more than i dimension
return java.lang.reflect.Array.newInstance(c, new int[dims]).getClass();
}
/**
* Produces a String representing a call to the EL interpreter.
*
* @param isTagFile true if the file is a tag file
* rather than a JSP
* @param expression
* a String containing zero or more "${}" expressions
* @param expectedType
* the expected type of the interpreted result
* @param fnmapvar
* Variable pointing to a function map.
* @return a String representing a call to the EL interpreter.
*/
public static String interpreterCall(boolean isTagFile, String expression,
Class expectedType, String fnmapvar) {
/*
* Determine which context object to use.
*/
String jspCtxt = null;
if (isTagFile) {
jspCtxt = "this.getJspContext()";
} else {
jspCtxt = "_jspx_page_context";
}
/*
* Determine whether to use the expected type's textual name or, if it's
* a primitive, the name of its correspondent boxed type.
*/
String returnType = expectedType.getCanonicalName();
String targetType = returnType;
String primitiveConverterMethod = null;
if (expectedType.isPrimitive()) {
if (expectedType.equals(Boolean.TYPE)) {
returnType = Boolean.class.getName();
primitiveConverterMethod = "booleanValue";
} else if (expectedType.equals(Byte.TYPE)) {
returnType = Byte.class.getName();
primitiveConverterMethod = "byteValue";
} else if (expectedType.equals(Character.TYPE)) {
returnType = Character.class.getName();
primitiveConverterMethod = "charValue";
} else if (expectedType.equals(Short.TYPE)) {
returnType = Short.class.getName();
primitiveConverterMethod = "shortValue";
} else if (expectedType.equals(Integer.TYPE)) {
returnType = Integer.class.getName();
primitiveConverterMethod = "intValue";
} else if (expectedType.equals(Long.TYPE)) {
returnType = Long.class.getName();
primitiveConverterMethod = "longValue";
} else if (expectedType.equals(Float.TYPE)) {
returnType = Float.class.getName();
primitiveConverterMethod = "floatValue";
} else if (expectedType.equals(Double.TYPE)) {
returnType = Double.class.getName();
primitiveConverterMethod = "doubleValue";
}
}
/*
* Build up the base call to the interpreter.
*/
// XXX - We use a proprietary call to the interpreter for now
// as the current standard machinery is inefficient and requires
// lots of wrappers and adapters. This should all clear up once
// the EL interpreter moves out of JSTL and into its own project.
// In the future, this should be replaced by code that calls
// ExpressionEvaluator.parseExpression() and then cache the resulting
// expression objects. The interpreterCall would simply select
// one of the pre-cached expressions and evaluate it.
// Note that PageContextImpl implements VariableResolver and
// the generated Servlet/SimpleTag implements FunctionMapper, so
// that machinery is already in place (mroth).
targetType = toJavaSourceType(targetType);
StringBuilder call = new StringBuilder(
"("
+ returnType
+ ") "
+ "org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate"
+ "(" + Generator.quote(expression) + ", " + targetType
+ ".class, " + "(javax.servlet.jsp.PageContext)" + jspCtxt + ", "
+ fnmapvar + ")");
/*
* Add the primitive converter method if we need to.
*/
if (primitiveConverterMethod != null) {
call.insert(0, "(");
call.append(")." + primitiveConverterMethod + "()");
}
return call.toString();
}
public static String coerceToPrimitiveBoolean(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToBoolean("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "false";
} else {
return Boolean.valueOf(s).toString();
}
}
}
public static String coerceToBoolean(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Boolean) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Boolean.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Boolean(false)";
} else {
// Detect format error at translation time
return "new java.lang.Boolean(" + Boolean.valueOf(s).toString() + ")";
}
}
}
public static String coerceToPrimitiveByte(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToByte("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(byte) 0";
} else {
return "((byte)" + Byte.valueOf(s).toString() + ")";
}
}
}
public static String coerceToByte(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Byte) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Byte.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Byte((byte) 0)";
} else {
// Detect format error at translation time
return "new java.lang.Byte((byte)" + Byte.valueOf(s).toString() + ")";
}
}
}
public static String coerceToChar(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToChar("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(char) 0";
} else {
char ch = s.charAt(0);
// this trick avoids escaping issues
return "((char) " + (int) ch + ")";
}
}
}
public static String coerceToCharacter(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Character) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Character.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Character((char) 0)";
} else {
char ch = s.charAt(0);
// this trick avoids escaping issues
return "new java.lang.Character((char) " + (int) ch + ")";
}
}
}
public static String coerceToPrimitiveDouble(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToDouble("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(double) 0";
} else {
return Double.valueOf(s).toString();
}
}
}
public static String coerceToDouble(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Double) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", Double.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Double(0)";
} else {
// Detect format error at translation time
return "new java.lang.Double(" + Double.valueOf(s).toString() + ")";
}
}
}
public static String coerceToPrimitiveFloat(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToFloat("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(float) 0";
} else {
return Float.valueOf(s).toString() + "f";
}
}
}
public static String coerceToFloat(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Float) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Float.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Float(0)";
} else {
// Detect format error at translation time
return "new java.lang.Float(" + Float.valueOf(s).toString() + "f)";
}
}
}
public static String coerceToInt(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToInt("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "0";
} else {
return Integer.valueOf(s).toString();
}
}
}
public static String coerceToInteger(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Integer) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Integer.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Integer(0)";
} else {
// Detect format error at translation time
return "new java.lang.Integer(" + Integer.valueOf(s).toString() + ")";
}
}
}
public static String coerceToPrimitiveShort(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToShort("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(short) 0";
} else {
return "((short) " + Short.valueOf(s).toString() + ")";
}
}
}
public static String coerceToShort(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Short) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Short.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Short((short) 0)";
} else {
// Detect format error at translation time
return "new java.lang.Short(\"" + Short.valueOf(s).toString() + "\")";
}
}
}
public static String coerceToPrimitiveLong(String s,
boolean isNamedAttribute) {
if (isNamedAttribute) {
return "org.apache.jasper.runtime.JspRuntimeLibrary.coerceToLong("
+ s + ")";
} else {
if (s == null || s.length() == 0) {
return "(long) 0";
} else {
return Long.valueOf(s).toString() + "l";
}
}
}
public static String coerceToLong(String s, boolean isNamedAttribute) {
if (isNamedAttribute) {
return "(java.lang.Long) org.apache.jasper.runtime.JspRuntimeLibrary.coerce("
+ s + ", java.lang.Long.class)";
} else {
if (s == null || s.length() == 0) {
return "new java.lang.Long(0)";
} else {
// Detect format error at translation time
return "new java.lang.Long(" + Long.valueOf(s).toString() + "l)";
}
}
}
public static BufferedInputStream getInputStream(String fname, Jar jar,
JspCompilationContext ctxt) throws IOException {
InputStream in = null;
if (jar != null) {
String jarEntryName = fname.substring(1, fname.length());
in = jar.getInputStream(jarEntryName);
} else {
in = ctxt.getResourceAsStream(fname);
}
if (in == null) {
throw new FileNotFoundException(MESSAGES.fileNotFound(fname));
}
return new BufferedInputStream(in, JspUtil.JSP_INPUT_STREAM_BUFFER_SIZE);
}
public static InputSource getInputSource(String fname, Jar jar, JspCompilationContext ctxt)
throws IOException {
InputSource source;
if (jar != null) {
String jarEntryName = fname.substring(1, fname.length());
source = new InputSource(jar.getInputStream(jarEntryName));
source.setSystemId(jar.getURL(jarEntryName));
} else {
source = new InputSource(ctxt.getResourceAsStream(fname));
source.setSystemId(ctxt.getResource(fname).toExternalForm());
}
return source;
}
/**
* Gets the fully-qualified class name of the tag handler corresponding to
* the given tag file path.
*
* @param path Tag file path
* @param urn The tag identifier
* @param err Error dispatcher
*
* @return Fully-qualified class name of the tag handler corresponding to
* the given tag file path
* @throws JasperException Failed to generate a class name for the tag
*/
public static String getTagHandlerClassName(String path, String urn,
ErrorDispatcher err) throws JasperException {
String className = null;
int begin = 0;
int index;
index = path.lastIndexOf(".tag");
if (index == -1) {
err.jspError(MESSAGES.invalidTagFileName(path));
}
// It's tempting to remove the ".tag" suffix here, but we can't.
// If we remove it, the fully-qualified class name of this tag
// could conflict with the package name of other tags.
// For instance, the tag file
// /WEB-INF/tags/foo.tag
// would have fully-qualified class name
// org.apache.jsp.tag.web.foo
// which would conflict with the package name of the tag file
// /WEB-INF/tags/foo/bar.tag
index = path.indexOf(WEB_INF_TAGS);
if (index != -1) {
className = Constants.TAG_FILE_PACKAGE_NAME + ".web.";
begin = index + WEB_INF_TAGS.length();
} else {
index = path.indexOf(META_INF_TAGS);
if (index != -1) {
className = getClassNameBase(urn);
begin = index + META_INF_TAGS.length();
} else {
err.jspError(MESSAGES.invalidTagFileDirectory(path));
}
}
className += makeJavaPackage(path.substring(begin));
return className;
}
private static String getClassNameBase(String urn) {
StringBuilder base =
new StringBuilder(Constants.TAG_FILE_PACKAGE_NAME + ".meta.");
if (urn != null) {
base.append(makeJavaPackage(urn));
base.append('.');
}
return base.toString();
}
/**
* Converts the given path to a Java package or fully-qualified class name
*
* @param path
* Path to convert
*
* @return Java package corresponding to the given path
*/
public static final String makeJavaPackage(String path) {
String classNameComponents[] = split(path, "/");
StringBuilder legalClassNames = new StringBuilder();
for (int i = 0; i < classNameComponents.length; i++) {
legalClassNames.append(makeJavaIdentifier(classNameComponents[i]));
if (i < classNameComponents.length - 1) {
legalClassNames.append('.');
}
}
return legalClassNames.toString();
}
/**
* Splits a string into it's components.
*
* @param path
* String to split
* @param pat
* Pattern to split at
* @return the components of the path
*/
private static final String[] split(String path, String pat) {
Vector comps = new Vector<>();
int pos = path.indexOf(pat);
int start = 0;
while (pos >= 0) {
if (pos > start) {
String comp = path.substring(start, pos);
comps.add(comp);
}
start = pos + pat.length();
pos = path.indexOf(pat, start);
}
if (start < path.length()) {
comps.add(path.substring(start));
}
String[] result = new String[comps.size()];
for (int i = 0; i < comps.size(); i++) {
result[i] = comps.elementAt(i);
}
return result;
}
/**
* Converts the given identifier to a legal Java identifier
*
* @param identifier
* Identifier to convert
*
* @return Legal Java identifier corresponding to the given identifier
*/
public static final String makeJavaIdentifier(String identifier) {
return makeJavaIdentifier(identifier, true);
}
/**
* Converts the given identifier to a legal Java identifier
* to be used for JSP Tag file attribute names.
*
* @param identifier
* Identifier to convert
*
* @return Legal Java identifier corresponding to the given identifier
*/
public static final String makeJavaIdentifierForAttribute(String identifier) {
return makeJavaIdentifier(identifier, false);
}
/**
* Converts the given identifier to a legal Java identifier.
*
* @param identifier
* Identifier to convert
*
* @return Legal Java identifier corresponding to the given identifier
*/
private static final String makeJavaIdentifier(String identifier,
boolean periodToUnderscore) {
StringBuilder modifiedIdentifier = new StringBuilder(identifier.length());
if (!Character.isJavaIdentifierStart(identifier.charAt(0))) {
modifiedIdentifier.append('_');
}
for (int i = 0; i < identifier.length(); i++) {
char ch = identifier.charAt(i);
if (Character.isJavaIdentifierPart(ch) &&
(ch != '_' || !periodToUnderscore)) {
modifiedIdentifier.append(ch);
} else if (ch == '.' && periodToUnderscore) {
modifiedIdentifier.append('_');
} else {
modifiedIdentifier.append(mangleChar(ch));
}
}
if (isJavaKeyword(modifiedIdentifier.toString())) {
modifiedIdentifier.append('_');
}
return modifiedIdentifier.toString();
}
/**
* Mangle the specified character to create a legal Java class name.
* @param ch The character
* @return the replacement character as a string
*/
public static final String mangleChar(char ch) {
char[] result = new char[5];
result[0] = '_';
result[1] = Character.forDigit((ch >> 12) & 0xf, 16);
result[2] = Character.forDigit((ch >> 8) & 0xf, 16);
result[3] = Character.forDigit((ch >> 4) & 0xf, 16);
result[4] = Character.forDigit(ch & 0xf, 16);
return new String(result);
}
/**
* Test whether the argument is a Java keyword.
* @param key The name
* @return true if the name is a java identifier
*/
public static boolean isJavaKeyword(String key) {
int i = 0;
int j = javaKeywords.length;
while (i < j) {
int k = (i + j) / 2;
int result = javaKeywords[k].compareTo(key);
if (result == 0) {
return true;
}
if (result < 0) {
i = k + 1;
} else {
j = k;
}
}
return false;
}
static InputStreamReader getReader(String fname, String encoding,
Jar jar, JspCompilationContext ctxt, ErrorDispatcher err)
throws JasperException, IOException {
return getReader(fname, encoding, jar, ctxt, err, 0);
}
static InputStreamReader getReader(String fname, String encoding,
Jar jar, JspCompilationContext ctxt, ErrorDispatcher err, int skip)
throws JasperException, IOException {
InputStreamReader reader = null;
InputStream in = getInputStream(fname, jar, ctxt);
for (int i = 0; i < skip; i++) {
in.read();
}
try {
reader = new InputStreamReader(in, encoding);
} catch (UnsupportedEncodingException ex) {
err.jspError(MESSAGES.unsupportedEncoding(encoding));
}
return reader;
}
/**
* Handles taking input from TLDs 'java.lang.Object' ->
* 'java.lang.Object.class' 'int' -> 'int.class' 'void' -> 'Void.TYPE'
* 'int[]' -> 'int[].class'
*
* @param type The type from the TLD
* @return the Java type
*/
public static String toJavaSourceTypeFromTld(String type) {
if (type == null || "void".equals(type)) {
return "java.lang.Void.TYPE";
}
return type + ".class";
}
/**
* Class.getName() return arrays in the form "[[[<et>", where et, the
* element type can be one of ZBCDFIJS or L<classname>;. It is
* converted into forms that can be understood by javac.
* @param type the type to convert
* @return the equivalent type in Java sources
*/
public static String toJavaSourceType(String type) {
if (type.charAt(0) != '[') {
return type;
}
int dims = 1;
String t = null;
for (int i = 1; i < type.length(); i++) {
if (type.charAt(i) == '[') {
dims++;
} else {
switch (type.charAt(i)) {
case 'Z': t = "boolean"; break;
case 'B': t = "byte"; break;
case 'C': t = "char"; break;
case 'D': t = "double"; break;
case 'F': t = "float"; break;
case 'I': t = "int"; break;
case 'J': t = "long"; break;
case 'S': t = "short"; break;
case 'L': t = type.substring(i+1, type.indexOf(';')); break;
}
break;
}
}
if (t == null) {
// Should never happen
throw new IllegalArgumentException("Unable to extract type from [" +
type + "]");
}
StringBuilder resultType = new StringBuilder(t);
for (; dims > 0; dims--) {
resultType.append("[]");
}
return resultType.toString();
}
}