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Jexl is an implementation of the JSTL Expression Language with extensions.
/*
* 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.commons.jexl2;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.apache.commons.jexl2.parser.SimpleNode;
import org.apache.commons.logging.Log;
import org.apache.commons.jexl2.parser.ASTFloatLiteral;
import org.apache.commons.jexl2.parser.ASTIntegerLiteral;
import org.apache.commons.jexl2.parser.JexlNode;
import org.apache.commons.jexl2.parser.ASTAdditiveNode;
import org.apache.commons.jexl2.parser.ASTAdditiveOperator;
import org.apache.commons.jexl2.parser.ASTAndNode;
import org.apache.commons.jexl2.parser.ASTAmbiguous;
import org.apache.commons.jexl2.parser.ASTArrayAccess;
import org.apache.commons.jexl2.parser.ASTArrayLiteral;
import org.apache.commons.jexl2.parser.ASTAssignment;
import org.apache.commons.jexl2.parser.ASTBitwiseAndNode;
import org.apache.commons.jexl2.parser.ASTBitwiseComplNode;
import org.apache.commons.jexl2.parser.ASTBitwiseOrNode;
import org.apache.commons.jexl2.parser.ASTBitwiseXorNode;
import org.apache.commons.jexl2.parser.ASTBlock;
import org.apache.commons.jexl2.parser.ASTConstructorNode;
import org.apache.commons.jexl2.parser.ASTDivNode;
import org.apache.commons.jexl2.parser.ASTEQNode;
import org.apache.commons.jexl2.parser.ASTERNode;
import org.apache.commons.jexl2.parser.ASTEmptyFunction;
import org.apache.commons.jexl2.parser.ASTFalseNode;
import org.apache.commons.jexl2.parser.ASTFunctionNode;
import org.apache.commons.jexl2.parser.ASTForeachStatement;
import org.apache.commons.jexl2.parser.ASTGENode;
import org.apache.commons.jexl2.parser.ASTGTNode;
import org.apache.commons.jexl2.parser.ASTIdentifier;
import org.apache.commons.jexl2.parser.ASTIfStatement;
import org.apache.commons.jexl2.parser.ASTJexlScript;
import org.apache.commons.jexl2.parser.ASTLENode;
import org.apache.commons.jexl2.parser.ASTLTNode;
import org.apache.commons.jexl2.parser.ASTMapEntry;
import org.apache.commons.jexl2.parser.ASTMapLiteral;
import org.apache.commons.jexl2.parser.ASTMethodNode;
import org.apache.commons.jexl2.parser.ASTModNode;
import org.apache.commons.jexl2.parser.ASTMulNode;
import org.apache.commons.jexl2.parser.ASTNENode;
import org.apache.commons.jexl2.parser.ASTNRNode;
import org.apache.commons.jexl2.parser.ASTNotNode;
import org.apache.commons.jexl2.parser.ASTNullLiteral;
import org.apache.commons.jexl2.parser.ASTNumberLiteral;
import org.apache.commons.jexl2.parser.ASTOrNode;
import org.apache.commons.jexl2.parser.ASTReference;
import org.apache.commons.jexl2.parser.ASTReferenceExpression;
import org.apache.commons.jexl2.parser.ASTReturnStatement;
import org.apache.commons.jexl2.parser.ASTSizeFunction;
import org.apache.commons.jexl2.parser.ASTSizeMethod;
import org.apache.commons.jexl2.parser.ASTStringLiteral;
import org.apache.commons.jexl2.parser.ASTTernaryNode;
import org.apache.commons.jexl2.parser.ASTTrueNode;
import org.apache.commons.jexl2.parser.ASTUnaryMinusNode;
import org.apache.commons.jexl2.parser.ASTWhileStatement;
import org.apache.commons.jexl2.parser.Node;
import org.apache.commons.jexl2.parser.ParserVisitor;
import org.apache.commons.jexl2.introspection.Uberspect;
import org.apache.commons.jexl2.introspection.JexlMethod;
import org.apache.commons.jexl2.introspection.JexlPropertyGet;
import org.apache.commons.jexl2.introspection.JexlPropertySet;
import org.apache.commons.jexl2.parser.ASTVar;
/**
* An interpreter of JEXL syntax.
*
* @since 2.0
*/
public class Interpreter implements ParserVisitor {
/** The logger. */
protected final Log logger;
/** The uberspect. */
protected final Uberspect uberspect;
/** The arithmetic handler. */
protected final JexlArithmetic arithmetic;
/** The map of registered functions. */
protected final Map functions;
/** The map of registered functions. */
protected Map functors;
/** The context to store/retrieve variables. */
protected final JexlContext context;
/** Strict interpreter flag. Do not modify; will be made final/private in a later version. */
protected boolean strict;
/** Silent intepreter flag. Do not modify; will be made final/private in a later version. */
protected boolean silent;
/** Cache executors. */
protected final boolean cache;
/** Registers or arguments. */
protected Object[] registers = null;
/**
* Parameter names if any.
* Intended for use in debugging; not currently used externally.
* @since 2.1
*/
@SuppressWarnings("unused")
private String[] parameters = null;
/**
* Cancellation support.
* @see #isCancelled()
* @since 2.1
*/
private volatile boolean cancelled = false;
/** Empty parameters for method matching. */
protected static final Object[] EMPTY_PARAMS = new Object[0];
/**
* Creates an interpreter.
* @param jexl the engine creating this interpreter
* @param aContext the context to evaluate expression
* @deprecated
*/
@Deprecated
public Interpreter(JexlEngine jexl, JexlContext aContext) {
this(jexl, aContext, !jexl.isLenient(), jexl.isSilent());
}
/**
* Creates an interpreter.
* @param jexl the engine creating this interpreter
* @param aContext the context to evaluate expression
* @param strictFlag whether this interpreter runs in strict mode
* @param silentFlag whether this interpreter runs in silent mode
* @since 2.1
*/
public Interpreter(JexlEngine jexl, JexlContext aContext, boolean strictFlag, boolean silentFlag) {
this.logger = jexl.logger;
this.uberspect = jexl.uberspect;
this.arithmetic = jexl.arithmetic;
this.functions = jexl.functions;
this.strict = strictFlag;
this.silent = silentFlag;
this.cache = jexl.cache != null;
this.context = aContext != null? aContext : JexlEngine.EMPTY_CONTEXT;
this.functors = null;
}
/**
* Copy constructor.
* @param base the base to copy
* @since 2.1
*/
protected Interpreter(Interpreter base) {
this.logger = base.logger;
this.uberspect = base.uberspect;
this.arithmetic = base.arithmetic;
this.functions = base.functions;
this.strict = base.strict;
this.silent = base.silent;
this.cache = base.cache;
this.context = base.context;
this.functors = base.functors;
}
/**
* Sets whether this interpreter considers unknown variables, methods and constructors as errors.
* @param flag true for strict, false for lenient
* @deprecated Do not use; will be removed in a later version
* @since 2.1
*/
// TODO why add a method and then deprecate it?
@Deprecated
public void setStrict(boolean flag) {
this.strict = flag;
}
/**
* Sets whether this interpreter throws JexlException when encountering errors.
* @param flag true for silent, false for verbose
* @deprecated Do not use; will be removed in a later version
*/
@Deprecated
public void setSilent(boolean flag) {
this.silent = flag;
}
/**
* Checks whether this interpreter considers unknown variables, methods and constructors as errors.
* @return true if strict, false otherwise
* @since 2.1
*/
public boolean isStrict() {
return this.strict;
}
/**
* Checks whether this interpreter throws JexlException when encountering errors.
* @return true if silent, false otherwise
*/
public boolean isSilent() {
return this.silent;
}
/**
* Interpret the given script/expression.
*
* If the underlying JEXL engine is silent, errors will be logged through its logger as info.
*
* @param node the script or expression to interpret.
* @return the result of the interpretation.
* @throws JexlException if any error occurs during interpretation.
*/
public Object interpret(JexlNode node) {
try {
return node.jjtAccept(this, null);
} catch (JexlException.Return xreturn) {
Object value = xreturn.getValue();
return value;
} catch (JexlException xjexl) {
if (silent) {
logger.warn(xjexl.getMessage(), xjexl.getCause());
return null;
}
throw xjexl;
} finally {
functors = null;
parameters = null;
registers = null;
}
}
/**
* Gets the context.
* @return the {@link JexlContext} used for evaluation.
* @since 2.1
*/
protected JexlContext getContext() {
return context;
}
/**
* Gets the uberspect.
* @return an {@link Uberspect}
*/
protected Uberspect getUberspect() {
return uberspect;
}
/**
* Sets this interpreter registers for bean access/assign expressions.
* Use setFrame(...) instead.
* @param theRegisters the array of registers
*/
@Deprecated
protected void setRegisters(Object... theRegisters) {
if (theRegisters != null) {
String[] regStrs = new String[theRegisters.length];
for (int r = 0; r < regStrs.length; ++r) {
regStrs[r] = "#" + r;
}
this.parameters = regStrs;
}
this.registers = theRegisters;
}
/**
* Sets this interpreter parameters and arguments.
* @param frame the calling frame
* @since 2.1
*/
protected void setFrame(JexlEngine.Frame frame) {
if (frame != null) {
this.parameters = frame.getParameters();
this.registers = frame.getRegisters();
} else {
this.parameters = null;
this.registers = null;
}
}
/**
* Finds the node causing a NPE for diadic operators.
* @param xrt the RuntimeException
* @param node the parent node
* @param left the left argument
* @param right the right argument
* @return the left, right or parent node
*/
protected JexlNode findNullOperand(RuntimeException xrt, JexlNode node, Object left, Object right) {
if (xrt instanceof ArithmeticException
&& JexlException.NULL_OPERAND == xrt.getMessage()) {
if (left == null) {
return node.jjtGetChild(0);
}
if (right == null) {
return node.jjtGetChild(1);
}
}
return node;
}
/**
* Triggered when variable can not be resolved.
* @param xjexl the JexlException ("undefined variable " + variable)
* @return throws JexlException if strict, null otherwise
*/
protected Object unknownVariable(JexlException xjexl) {
if (strict) {
throw xjexl;
}
if (!silent) {
logger.warn(xjexl.getMessage());
}
return null;
}
/**
* Triggered when method, function or constructor invocation fails.
* @param xjexl the JexlException wrapping the original error
* @return throws JexlException if strict, null otherwise
*/
protected Object invocationFailed(JexlException xjexl) {
if (strict || xjexl instanceof JexlException.Return) {
throw xjexl;
}
if (!silent) {
logger.warn(xjexl.getMessage(), xjexl.getCause());
}
return null;
}
/**
* Checks whether this interpreter execution was cancelled due to thread interruption.
* @return true if cancelled, false otherwise
* @since 2.1
*/
protected boolean isCancelled() {
if (cancelled | Thread.interrupted()) {
cancelled = true;
}
return cancelled;
}
/**
* Resolves a namespace, eventually allocating an instance using context as constructor argument.
* The lifetime of such instances span the current expression or script evaluation.
*
* @param prefix the prefix name (may be null for global namespace)
* @param node the AST node
* @return the namespace instance
*/
protected Object resolveNamespace(String prefix, JexlNode node) {
Object namespace = null;
// check whether this namespace is a functor
if (functors != null) {
namespace = functors.get(prefix);
if (namespace != null) {
return namespace;
}
}
// check if namespace if a resolver
if (context instanceof NamespaceResolver) {
namespace = ((NamespaceResolver) context).resolveNamespace(prefix);
}
if (namespace == null) {
namespace = functions.get(prefix);
if (prefix != null && namespace == null) {
throw new JexlException(node, "no such function namespace " + prefix);
}
}
// allow namespace to be instantiated as functor with context if possible, not an error otherwise
if (namespace instanceof Class) {
Object[] args = new Object[]{context};
JexlMethod ctor = uberspect.getConstructorMethod(namespace, args, node);
if (ctor != null) {
try {
namespace = ctor.invoke(namespace, args);
if (functors == null) {
functors = new HashMap();
}
functors.put(prefix, namespace);
} catch (Exception xinst) {
throw new JexlException(node, "unable to instantiate namespace " + prefix, xinst);
}
}
}
return namespace;
}
/** {@inheritDoc} */
public Object visit(ASTAdditiveNode node, Object data) {
/**
* The pattern for exception mgmt is to let the child*.jjtAccept
* out of the try/catch loop so that if one fails, the ex will
* traverse up to the interpreter.
* In cases where this is not convenient/possible, JexlException must
* be caught explicitly and rethrown.
*/
Object left = node.jjtGetChild(0).jjtAccept(this, data);
for (int c = 2, size = node.jjtGetNumChildren(); c < size; c += 2) {
Object right = node.jjtGetChild(c).jjtAccept(this, data);
try {
JexlNode op = node.jjtGetChild(c - 1);
if (op instanceof ASTAdditiveOperator) {
String which = op.image;
if ("+".equals(which)) {
left = arithmetic.add(left, right);
continue;
}
if ("-".equals(which)) {
left = arithmetic.subtract(left, right);
continue;
}
throw new UnsupportedOperationException("unknown operator " + which);
}
throw new IllegalArgumentException("unknown operator " + op);
} catch (ArithmeticException xrt) {
JexlNode xnode = findNullOperand(xrt, node, left, right);
throw new JexlException(xnode, "+/- error", xrt);
}
}
return left;
}
/** {@inheritDoc} */
public Object visit(ASTAdditiveOperator node, Object data) {
throw new UnsupportedOperationException("Shoud not be called.");
}
/** {@inheritDoc} */
public Object visit(ASTAndNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
try {
boolean leftValue = arithmetic.toBoolean(left);
if (!leftValue) {
return Boolean.FALSE;
}
} catch (RuntimeException xrt) {
throw new JexlException(node.jjtGetChild(0), "boolean coercion error", xrt);
}
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
boolean rightValue = arithmetic.toBoolean(right);
if (!rightValue) {
return Boolean.FALSE;
}
} catch (ArithmeticException xrt) {
throw new JexlException(node.jjtGetChild(1), "boolean coercion error", xrt);
}
return Boolean.TRUE;
}
/** {@inheritDoc} */
public Object visit(ASTArrayAccess node, Object data) {
// first objectNode is the identifier
Object object = node.jjtGetChild(0).jjtAccept(this, data);
// can have multiple nodes - either an expression, integer literal or reference
int numChildren = node.jjtGetNumChildren();
for (int i = 1; i < numChildren; i++) {
JexlNode nindex = node.jjtGetChild(i);
if (nindex instanceof JexlNode.Literal) {
object = nindex.jjtAccept(this, object);
} else {
Object index = nindex.jjtAccept(this, null);
object = getAttribute(object, index, nindex);
}
}
return object;
}
/** {@inheritDoc} */
public Object visit(ASTArrayLiteral node, Object data) {
Object literal = node.getLiteral();
if (literal == null) {
int childCount = node.jjtGetNumChildren();
Object[] array = new Object[childCount];
for (int i = 0; i < childCount; i++) {
Object entry = node.jjtGetChild(i).jjtAccept(this, data);
array[i] = entry;
}
literal = arithmetic.narrowArrayType(array);
node.setLiteral(literal);
}
return literal;
}
/** {@inheritDoc} */
public Object visit(ASTAssignment node, Object data) {
// left contains the reference to assign to
int register = -1;
JexlNode left = node.jjtGetChild(0);
if (left instanceof ASTIdentifier) {
ASTIdentifier var = (ASTIdentifier) left;
register = var.getRegister();
if (register < 0) {
throw new JexlException(left, "unknown variable " + left.image);
}
} else if (!(left instanceof ASTReference)) {
throw new JexlException(left, "illegal assignment form 0");
}
// right is the value expression to assign
Object right = node.jjtGetChild(1).jjtAccept(this, data);
// determine initial object & property:
JexlNode objectNode = null;
Object object = register >= 0 ? registers[register] : null;
JexlNode propertyNode = null;
Object property = null;
boolean isVariable = true;
int v = 0;
StringBuilder variableName = null;
// 1: follow children till penultimate, resolve dot/array
int last = left.jjtGetNumChildren() - 1;
// check we are not assigning a register itself
boolean isRegister = last < 0 && register >= 0;
// start at 1 if register
for (int c = register >= 0 ? 1 : 0; c < last; ++c) {
objectNode = left.jjtGetChild(c);
// evaluate the property within the object
object = objectNode.jjtAccept(this, object);
if (object != null) {
continue;
}
isVariable &= objectNode instanceof ASTIdentifier
|| (objectNode instanceof ASTNumberLiteral && ((ASTNumberLiteral) objectNode).isInteger());
// if we get null back as a result, check for an ant variable
if (isVariable) {
if (v == 0) {
variableName = new StringBuilder(left.jjtGetChild(0).image);
v = 1;
}
for (; v <= c; ++v) {
variableName.append('.');
variableName.append(left.jjtGetChild(v).image);
}
object = context.get(variableName.toString());
// disallow mixing ant & bean with same root; avoid ambiguity
if (object != null) {
isVariable = false;
}
} else {
throw new JexlException(objectNode, "illegal assignment form");
}
}
// 2: last objectNode will perform assignement in all cases
propertyNode = isRegister ? null : left.jjtGetChild(last);
boolean antVar = false;
if (propertyNode instanceof ASTIdentifier) {
ASTIdentifier identifier = (ASTIdentifier) propertyNode;
register = identifier.getRegister();
if (register >= 0) {
isRegister = true;
} else {
property = identifier.image;
antVar = true;
}
} else if (propertyNode instanceof ASTNumberLiteral && ((ASTNumberLiteral) propertyNode).isInteger()) {
property = ((ASTNumberLiteral) propertyNode).getLiteral();
antVar = true;
} else if (propertyNode instanceof ASTArrayAccess) {
// first objectNode is the identifier
objectNode = propertyNode;
ASTArrayAccess narray = (ASTArrayAccess) objectNode;
Object nobject = narray.jjtGetChild(0).jjtAccept(this, object);
if (nobject == null) {
throw new JexlException(objectNode, "array element is null");
} else {
object = nobject;
}
// can have multiple nodes - either an expression, integer literal or
// reference
last = narray.jjtGetNumChildren() - 1;
for (int i = 1; i < last; i++) {
objectNode = narray.jjtGetChild(i);
if (objectNode instanceof JexlNode.Literal) {
object = objectNode.jjtAccept(this, object);
} else {
Object index = objectNode.jjtAccept(this, null);
object = getAttribute(object, index, objectNode);
}
}
property = narray.jjtGetChild(last).jjtAccept(this, null);
} else if (!isRegister) {
throw new JexlException(objectNode, "illegal assignment form");
}
// deal with ant variable; set context
if (isRegister) {
registers[register] = right;
return right;
} else if (antVar) {
if (isVariable && object == null) {
if (variableName != null) {
if (last > 0) {
variableName.append('.');
}
variableName.append(property);
property = variableName.toString();
}
try {
context.set(String.valueOf(property), right);
} catch (UnsupportedOperationException xsupport) {
throw new JexlException(node, "context is readonly", xsupport);
}
return right;
}
}
if (property == null) {
// no property, we fail
throw new JexlException(propertyNode, "property is null");
}
if (object == null) {
// no object, we fail
throw new JexlException(objectNode, "bean is null");
}
// one before last, assign
setAttribute(object, property, right, propertyNode);
return right;
}
/** {@inheritDoc} */
public Object visit(ASTBitwiseAndNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.bitwiseAnd(left, right);
} catch (ArithmeticException xrt) {
throw new JexlException(node, "& error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTBitwiseComplNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
try {
return arithmetic.bitwiseComplement(left);
} catch (ArithmeticException xrt) {
throw new JexlException(node, "~ error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTBitwiseOrNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.bitwiseOr(left, right);
} catch (ArithmeticException xrt) {
throw new JexlException(node, "| error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTBitwiseXorNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.bitwiseXor(left, right);
} catch (ArithmeticException xrt) {
throw new JexlException(node, "^ error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTBlock node, Object data) {
int numChildren = node.jjtGetNumChildren();
Object result = null;
for (int i = 0; i < numChildren; i++) {
result = node.jjtGetChild(i).jjtAccept(this, data);
}
return result;
}
/** {@inheritDoc} */
public Object visit(ASTDivNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.divide(left, right);
} catch (ArithmeticException xrt) {
if (!strict) {
return new Double(0.0);
}
JexlNode xnode = findNullOperand(xrt, node, left, right);
throw new JexlException(xnode, "divide error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTEmptyFunction node, Object data) {
Object o = node.jjtGetChild(0).jjtAccept(this, data);
if (o == null) {
return Boolean.TRUE;
}
if (o instanceof String && "".equals(o)) {
return Boolean.TRUE;
}
if (o.getClass().isArray() && ((Object[]) o).length == 0) {
return Boolean.TRUE;
}
if (o instanceof Collection) {
return ((Collection) o).isEmpty() ? Boolean.TRUE : Boolean.FALSE;
}
// Map isn't a collection
if (o instanceof Map) {
return ((Map) o).isEmpty() ? Boolean.TRUE : Boolean.FALSE;
}
return Boolean.FALSE;
}
/** {@inheritDoc} */
public Object visit(ASTEQNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.equals(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "== error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTFalseNode node, Object data) {
return Boolean.FALSE;
}
/** {@inheritDoc} */
public Object visit(ASTForeachStatement node, Object data) {
Object result = null;
/* first objectNode is the loop variable */
ASTReference loopReference = (ASTReference) node.jjtGetChild(0);
ASTIdentifier loopVariable = (ASTIdentifier) loopReference.jjtGetChild(0);
int register = loopVariable.getRegister();
/* second objectNode is the variable to iterate */
Object iterableValue = node.jjtGetChild(1).jjtAccept(this, data);
// make sure there is a value to iterate on and a statement to execute
if (iterableValue != null && node.jjtGetNumChildren() >= 3) {
/* third objectNode is the statement to execute */
JexlNode statement = node.jjtGetChild(2);
// get an iterator for the collection/array etc via the
// introspector.
Iterator itemsIterator = uberspect.getIterator(iterableValue, node);
if (itemsIterator != null) {
while (itemsIterator.hasNext()) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
// set loopVariable to value of iterator
Object value = itemsIterator.next();
if (register < 0) {
context.set(loopVariable.image, value);
} else {
registers[register] = value;
}
// execute statement
result = statement.jjtAccept(this, data);
}
}
}
return result;
}
/** {@inheritDoc} */
public Object visit(ASTGENode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.greaterThanOrEqual(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, ">= error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTGTNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.greaterThan(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "> error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTERNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
// use arithmetic / pattern matching ?
if (right instanceof java.util.regex.Pattern || right instanceof String) {
return arithmetic.matches(left, right) ? Boolean.TRUE : Boolean.FALSE;
}
// left in right ? <=> right.contains(left) ?
// try contains on collection
if (right instanceof Set) {
return ((Set) right).contains(left) ? Boolean.TRUE : Boolean.FALSE;
}
// try contains on map key
if (right instanceof Map) {
return ((Map) right).containsKey(left) ? Boolean.TRUE : Boolean.FALSE;
}
// try contains on collection
if (right instanceof Collection) {
return ((Collection) right).contains(left) ? Boolean.TRUE : Boolean.FALSE;
}
// try a contains method (duck type set)
try {
Object[] argv = {left};
JexlMethod vm = uberspect.getMethod(right, "contains", argv, node);
if (vm != null) {
return arithmetic.toBoolean(vm.invoke(right, argv)) ? Boolean.TRUE : Boolean.FALSE;
} else if (arithmetic.narrowArguments(argv)) {
vm = uberspect.getMethod(right, "contains", argv, node);
if (vm != null) {
return arithmetic.toBoolean(vm.invoke(right, argv)) ? Boolean.TRUE : Boolean.FALSE;
}
}
} catch (InvocationTargetException e) {
throw new JexlException(node, "=~ invocation error", e.getCause());
} catch (Exception e) {
throw new JexlException(node, "=~ error", e);
}
// try iterative comparison
Iterator it = uberspect.getIterator(right, node);
if (it != null) {
while (it.hasNext()) {
Object next = it.next();
if (next == left || (next != null && next.equals(left))) {
return Boolean.TRUE;
}
}
return Boolean.FALSE;
}
// defaults to equal
return arithmetic.equals(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "=~ error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTIdentifier node, Object data) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
String name = node.image;
if (data == null) {
int register = node.getRegister();
if (register >= 0) {
return registers[register];
}
Object value = context.get(name);
if (value == null
&& !(node.jjtGetParent() instanceof ASTReference)
&& !context.has(name)
&& !isTernaryProtected(node)) {
JexlException xjexl = new JexlException.Variable(node, name);
return unknownVariable(xjexl);
}
return value;
} else {
return getAttribute(data, name, node);
}
}
/**
* @deprecated Do not use
*/
@Deprecated
public Object visit(ASTFloatLiteral node, Object data) {
throw new UnsupportedOperationException("Method should not be called; only present for API compatibiltiy");
}
/**
* @deprecated Do not use
*/
@Deprecated
public Object visit(ASTIntegerLiteral node, Object data) {
throw new UnsupportedOperationException("Method should not be called; only present for API compatibiltiy");
}
/** {@inheritDoc} */
public Object visit(ASTVar node, Object data) {
return visit((ASTIdentifier) node, data);
}
/** {@inheritDoc} */
public Object visit(ASTIfStatement node, Object data) {
int n = 0;
try {
Object result = null;
/* first objectNode is the condition */
Object expression = node.jjtGetChild(0).jjtAccept(this, data);
if (arithmetic.toBoolean(expression)) {
// first objectNode is true statement
n = 1;
result = node.jjtGetChild(1).jjtAccept(this, data);
} else {
// if there is a false, execute it. false statement is the second
// objectNode
if (node.jjtGetNumChildren() == 3) {
n = 2;
result = node.jjtGetChild(2).jjtAccept(this, data);
}
}
return result;
} catch (JexlException error) {
throw error;
} catch (ArithmeticException xrt) {
throw new JexlException(node.jjtGetChild(n), "if error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTNumberLiteral node, Object data) {
if (data != null && node.isInteger()) {
return getAttribute(data, node.getLiteral(), node);
}
return node.getLiteral();
}
/** {@inheritDoc} */
public Object visit(ASTJexlScript node, Object data) {
int numChildren = node.jjtGetNumChildren();
Object result = null;
for (int i = 0; i < numChildren; i++) {
JexlNode child = node.jjtGetChild(i);
result = child.jjtAccept(this, data);
}
return result;
}
/** {@inheritDoc} */
public Object visit(ASTLENode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.lessThanOrEqual(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "<= error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTLTNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.lessThan(left, right) ? Boolean.TRUE : Boolean.FALSE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "< error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTMapEntry node, Object data) {
Object key = node.jjtGetChild(0).jjtAccept(this, data);
Object value = node.jjtGetChild(1).jjtAccept(this, data);
return new Object[]{key, value};
}
/** {@inheritDoc} */
public Object visit(ASTMapLiteral node, Object data) {
int childCount = node.jjtGetNumChildren();
Map map = new HashMap();
for (int i = 0; i < childCount; i++) {
Object[] entry = (Object[]) (node.jjtGetChild(i)).jjtAccept(this, data);
map.put(entry[0], entry[1]);
}
return map;
}
/**
* Calls a method (or function).
*
* Method resolution is a follows:
* 1 - attempt to find a method in the bean passed as parameter;
* 2 - if this fails, narrow the arguments and try again
* 3 - if this still fails, seeks a Script or JexlMethod as a property of that bean.
*
* @param node the method node
* @param bean the bean this method should be invoked upon
* @param methodNode the node carrying the method name
* @param argb the first argument index, child of the method node
* @return the result of the method invocation
*/
private Object call(JexlNode node, Object bean, ASTIdentifier methodNode, int argb) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
String methodName = methodNode.image;
// evaluate the arguments
int argc = node.jjtGetNumChildren() - argb;
Object[] argv = new Object[argc];
for (int i = 0; i < argc; i++) {
argv[i] = node.jjtGetChild(i + argb).jjtAccept(this, null);
}
JexlException xjexl = null;
try {
// attempt to reuse last executor cached in volatile JexlNode.value
if (cache) {
Object cached = node.jjtGetValue();
if (cached instanceof JexlMethod) {
JexlMethod me = (JexlMethod) cached;
Object eval = me.tryInvoke(methodName, bean, argv);
if (!me.tryFailed(eval)) {
return eval;
}
}
}
boolean cacheable = cache;
JexlMethod vm = uberspect.getMethod(bean, methodName, argv, node);
// DG: If we can't find an exact match, narrow the parameters and try again
if (vm == null) {
if (arithmetic.narrowArguments(argv)) {
vm = uberspect.getMethod(bean, methodName, argv, node);
}
if (vm == null) {
Object functor = null;
// could not find a method, try as a var
if (bean == context) {
int register = methodNode.getRegister();
if (register >= 0) {
functor = registers[register];
} else {
functor = context.get(methodName);
}
} else {
JexlPropertyGet gfunctor = uberspect.getPropertyGet(bean, methodName, node);
if (gfunctor != null) {
functor = gfunctor.tryInvoke(bean, methodName);
}
}
// script of jexl method will do
if (functor instanceof Script) {
return ((Script) functor).execute(context, argv.length > 0 ? argv : null);
} else if (functor instanceof JexlMethod) {
vm = (JexlMethod) functor;
cacheable = false;
} else {
xjexl = new JexlException.Method(node, methodName);
}
}
}
if (xjexl == null) {
// vm cannot be null if xjexl is null
Object eval = vm.invoke(bean, argv);
// cache executor in volatile JexlNode.value
if (cacheable && vm.isCacheable()) {
node.jjtSetValue(vm);
}
return eval;
}
} catch (InvocationTargetException e) {
xjexl = new JexlException(node, "method invocation error", e.getCause());
} catch (Exception e) {
xjexl = new JexlException(node, "method error", e);
}
return invocationFailed(xjexl);
}
/** {@inheritDoc} */
public Object visit(ASTMethodNode node, Object data) {
// the object to invoke the method on should be in the data argument
if (data == null) {
// if the method node is the first child of the (ASTReference) parent,
// it is considered as calling a 'top level' function
if (node.jjtGetParent().jjtGetChild(0) == node) {
data = resolveNamespace(null, node);
if (data == null) {
data = context;
}
} else {
throw new JexlException(node, "attempting to call method on null");
}
}
// objectNode 0 is the identifier (method name), the others are parameters.
ASTIdentifier methodNode = (ASTIdentifier) node.jjtGetChild(0);
return call(node, data, methodNode, 1);
}
/** {@inheritDoc} */
public Object visit(ASTFunctionNode node, Object data) {
// objectNode 0 is the prefix
String prefix = node.jjtGetChild(0).image;
Object namespace = resolveNamespace(prefix, node);
// objectNode 1 is the identifier , the others are parameters.
ASTIdentifier functionNode = (ASTIdentifier) node.jjtGetChild(1);
return call(node, namespace, functionNode, 2);
}
/** {@inheritDoc} */
public Object visit(ASTConstructorNode node, Object data) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
// first child is class or class name
Object cobject = node.jjtGetChild(0).jjtAccept(this, data);
// get the ctor args
int argc = node.jjtGetNumChildren() - 1;
Object[] argv = new Object[argc];
for (int i = 0; i < argc; i++) {
argv[i] = node.jjtGetChild(i + 1).jjtAccept(this, null);
}
JexlException xjexl = null;
try {
// attempt to reuse last constructor cached in volatile JexlNode.value
if (cache) {
Object cached = node.jjtGetValue();
if (cached instanceof JexlMethod) {
JexlMethod mctor = (JexlMethod) cached;
Object eval = mctor.tryInvoke(null, cobject, argv);
if (!mctor.tryFailed(eval)) {
return eval;
}
}
}
JexlMethod ctor = uberspect.getConstructorMethod(cobject, argv, node);
// DG: If we can't find an exact match, narrow the parameters and try again
if (ctor == null) {
if (arithmetic.narrowArguments(argv)) {
ctor = uberspect.getConstructorMethod(cobject, argv, node);
}
if (ctor == null) {
xjexl = new JexlException.Method(node, cobject.toString());
}
}
if (xjexl == null) {
Object instance = ctor.invoke(cobject, argv);
// cache executor in volatile JexlNode.value
if (cache && ctor.isCacheable()) {
node.jjtSetValue(ctor);
}
return instance;
}
} catch (InvocationTargetException e) {
xjexl = new JexlException(node, "constructor invocation error", e.getCause());
} catch (Exception e) {
xjexl = new JexlException(node, "constructor error", e);
}
return invocationFailed(xjexl);
}
/** {@inheritDoc} */
public Object visit(ASTModNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.mod(left, right);
} catch (ArithmeticException xrt) {
if (!strict) {
return new Double(0.0);
}
JexlNode xnode = findNullOperand(xrt, node, left, right);
throw new JexlException(xnode, "% error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTMulNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.multiply(left, right);
} catch (ArithmeticException xrt) {
JexlNode xnode = findNullOperand(xrt, node, left, right);
throw new JexlException(xnode, "* error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTNENode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
return arithmetic.equals(left, right) ? Boolean.FALSE : Boolean.TRUE;
} catch (ArithmeticException xrt) {
JexlNode xnode = findNullOperand(xrt, node, left, right);
throw new JexlException(xnode, "!= error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTNRNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
if (right instanceof java.util.regex.Pattern || right instanceof String) {
// use arithmetic / pattern matching
return arithmetic.matches(left, right) ? Boolean.FALSE : Boolean.TRUE;
}
// try contains on collection
if (right instanceof Set) {
return ((Set) right).contains(left) ? Boolean.FALSE : Boolean.TRUE;
}
// try contains on map key
if (right instanceof Map) {
return ((Map) right).containsKey(left) ? Boolean.FALSE : Boolean.TRUE;
}
// try contains on collection
if (right instanceof Collection) {
return ((Collection) right).contains(left) ? Boolean.FALSE : Boolean.TRUE;
}
// try a contains method (duck type set)
try {
Object[] argv = {left};
JexlMethod vm = uberspect.getMethod(right, "contains", argv, node);
if (vm != null) {
return arithmetic.toBoolean(vm.invoke(right, argv)) ? Boolean.FALSE : Boolean.TRUE;
} else if (arithmetic.narrowArguments(argv)) {
vm = uberspect.getMethod(right, "contains", argv, node);
if (vm != null) {
return arithmetic.toBoolean(vm.invoke(right, argv)) ? Boolean.FALSE : Boolean.TRUE;
}
}
} catch (InvocationTargetException e) {
throw new JexlException(node, "!~ invocation error", e.getCause());
} catch (Exception e) {
throw new JexlException(node, "!~ error", e);
}
// try iterative comparison
Iterator it = uberspect.getIterator(right, node.jjtGetChild(1));
if (it != null) {
while (it.hasNext()) {
Object next = it.next();
if (next == left || (next != null && next.equals(left))) {
return Boolean.FALSE;
}
}
return Boolean.TRUE;
}
// defaults to not equal
return arithmetic.equals(left, right) ? Boolean.FALSE : Boolean.TRUE;
} catch (ArithmeticException xrt) {
throw new JexlException(node, "!~ error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTNotNode node, Object data) {
Object val = node.jjtGetChild(0).jjtAccept(this, data);
return arithmetic.toBoolean(val) ? Boolean.FALSE : Boolean.TRUE;
}
/** {@inheritDoc} */
public Object visit(ASTNullLiteral node, Object data) {
return null;
}
/** {@inheritDoc} */
public Object visit(ASTOrNode node, Object data) {
Object left = node.jjtGetChild(0).jjtAccept(this, data);
try {
boolean leftValue = arithmetic.toBoolean(left);
if (leftValue) {
return Boolean.TRUE;
}
} catch (ArithmeticException xrt) {
throw new JexlException(node.jjtGetChild(0), "boolean coercion error", xrt);
}
Object right = node.jjtGetChild(1).jjtAccept(this, data);
try {
boolean rightValue = arithmetic.toBoolean(right);
if (rightValue) {
return Boolean.TRUE;
}
} catch (ArithmeticException xrt) {
throw new JexlException(node.jjtGetChild(1), "boolean coercion error", xrt);
}
return Boolean.FALSE;
}
/** {@inheritDoc} */
public Object visit(ASTReference node, Object data) {
// could be array access, identifier or map literal
// followed by zero or more ("." and array access, method, size,
// identifier or integer literal)
int numChildren = node.jjtGetNumChildren();
// pass first piece of data in and loop through children
Object result = null;
StringBuilder variableName = null;
String propertyName = null;
boolean isVariable = true;
int v = 0;
for (int c = 0; c < numChildren; c++) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
JexlNode theNode = node.jjtGetChild(c);
// integer literals may be part of an antish var name only if no bean was found so far
if (result == null && theNode instanceof ASTNumberLiteral && ((ASTNumberLiteral) theNode).isInteger()) {
isVariable &= v > 0;
} else {
isVariable &= (theNode instanceof ASTIdentifier);
result = theNode.jjtAccept(this, result);
}
// if we get null back a result, check for an ant variable
if (result == null && isVariable) {
if (v == 0) {
variableName = new StringBuilder(node.jjtGetChild(0).image);
v = 1;
}
for (; v <= c; ++v) {
variableName.append('.');
variableName.append(node.jjtGetChild(v).image);
}
result = context.get(variableName.toString());
} else {
propertyName = theNode.image;
}
}
if (result == null) {
if (isVariable && !isTernaryProtected(node)
// variable unknow in context and not (from) a register
&& !(context.has(variableName.toString())
|| (numChildren == 1
&& node.jjtGetChild(0) instanceof ASTIdentifier
&& ((ASTIdentifier) node.jjtGetChild(0)).getRegister() >= 0))) {
JexlException xjexl = propertyName != null
? new JexlException.Property(node, propertyName)
: new JexlException.Variable(node, variableName.toString());
return unknownVariable(xjexl);
}
}
return result;
}
/**
* {@inheritDoc}
* @since 2.1
*/
public Object visit(ASTReferenceExpression node, Object data) {
ASTArrayAccess upper = node;
return visit(upper, data);
}
/**
* {@inheritDoc}
* @since 2.1
*/
public Object visit(ASTReturnStatement node, Object data) {
Object val = node.jjtGetChild(0).jjtAccept(this, data);
throw new JexlException.Return(node, null, val);
}
/**
* Check if a null evaluated expression is protected by a ternary expression.
* The rationale is that the ternary / elvis expressions are meant for the user to explictly take
* control over the error generation; ie, ternaries can return null even if the engine in strict mode
* would normally throw an exception.
* @param node the expression node
* @return true if nullable variable, false otherwise
*/
private boolean isTernaryProtected(JexlNode node) {
for (JexlNode walk = node.jjtGetParent(); walk != null; walk = walk.jjtGetParent()) {
if (walk instanceof ASTTernaryNode) {
return true;
} else if (!(walk instanceof ASTReference || walk instanceof ASTArrayAccess)) {
break;
}
}
return false;
}
/** {@inheritDoc} */
public Object visit(ASTSizeFunction node, Object data) {
Object val = node.jjtGetChild(0).jjtAccept(this, data);
if (val == null) {
throw new JexlException(node, "size() : argument is null", null);
}
return Integer.valueOf(sizeOf(node, val));
}
/** {@inheritDoc} */
public Object visit(ASTSizeMethod node, Object data) {
return Integer.valueOf(sizeOf(node, data));
}
/** {@inheritDoc} */
public Object visit(ASTStringLiteral node, Object data) {
if (data != null) {
return getAttribute(data, node.getLiteral(), node);
}
return node.image;
}
/** {@inheritDoc} */
public Object visit(ASTTernaryNode node, Object data) {
Object condition = node.jjtGetChild(0).jjtAccept(this, data);
if (node.jjtGetNumChildren() == 3) {
if (condition != null && arithmetic.toBoolean(condition)) {
return node.jjtGetChild(1).jjtAccept(this, data);
} else {
return node.jjtGetChild(2).jjtAccept(this, data);
}
}
if (condition != null && arithmetic.toBoolean(condition)) {
return condition;
} else {
return node.jjtGetChild(1).jjtAccept(this, data);
}
}
/** {@inheritDoc} */
public Object visit(ASTTrueNode node, Object data) {
return Boolean.TRUE;
}
/** {@inheritDoc} */
public Object visit(ASTUnaryMinusNode node, Object data) {
JexlNode valNode = node.jjtGetChild(0);
Object val = valNode.jjtAccept(this, data);
try {
Object number = arithmetic.negate(val);
// attempt to recoerce to literal class
if (valNode instanceof ASTNumberLiteral && number instanceof Number) {
number = arithmetic.narrowNumber((Number) number, ((ASTNumberLiteral) valNode).getLiteralClass());
}
return number;
} catch (ArithmeticException xrt) {
throw new JexlException(valNode, "arithmetic error", xrt);
}
}
/** {@inheritDoc} */
public Object visit(ASTWhileStatement node, Object data) {
Object result = null;
/* first objectNode is the expression */
Node expressionNode = node.jjtGetChild(0);
while (arithmetic.toBoolean(expressionNode.jjtAccept(this, data))) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
// execute statement
if (node.jjtGetNumChildren() > 1) {
result = node.jjtGetChild(1).jjtAccept(this, data);
}
}
return result;
}
/**
* Calculate the size of various types: Collection, Array,
* Map, String, and anything that has a int size() method.
* @param node the node that gave the value to size
* @param val the object to get the size of.
* @return the size of val
*/
private int sizeOf(JexlNode node, Object val) {
if (val instanceof Collection) {
return ((Collection) val).size();
} else if (val.getClass().isArray()) {
return Array.getLength(val);
} else if (val instanceof Map) {
return ((Map) val).size();
} else if (val instanceof String) {
return ((String) val).length();
} else {
// check if there is a size method on the object that returns an
// integer and if so, just use it
Object[] params = new Object[0];
JexlMethod vm = uberspect.getMethod(val, "size", EMPTY_PARAMS, node);
if (vm != null && vm.getReturnType() == Integer.TYPE) {
Integer result;
try {
result = (Integer) vm.invoke(val, params);
} catch (Exception e) {
throw new JexlException(node, "size() : error executing", e);
}
return result.intValue();
}
throw new JexlException(node, "size() : unsupported type : " + val.getClass(), null);
}
}
/**
* Gets an attribute of an object.
*
* @param object to retrieve value from
* @param attribute the attribute of the object, e.g. an index (1, 0, 2) or
* key for a map
* @return the attribute value
*/
public Object getAttribute(Object object, Object attribute) {
return getAttribute(object, attribute, null);
}
/**
* Gets an attribute of an object.
*
* @param object to retrieve value from
* @param attribute the attribute of the object, e.g. an index (1, 0, 2) or
* key for a map
* @param node the node that evaluated as the object
* @return the attribute value
*/
protected Object getAttribute(Object object, Object attribute, JexlNode node) {
if (object == null) {
throw new JexlException(node, "object is null");
}
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
// attempt to reuse last executor cached in volatile JexlNode.value
if (node != null && cache) {
Object cached = node.jjtGetValue();
if (cached instanceof JexlPropertyGet) {
JexlPropertyGet vg = (JexlPropertyGet) cached;
Object value = vg.tryInvoke(object, attribute);
if (!vg.tryFailed(value)) {
return value;
}
}
}
JexlPropertyGet vg = uberspect.getPropertyGet(object, attribute, node);
if (vg != null) {
try {
Object value = vg.invoke(object);
// cache executor in volatile JexlNode.value
if (node != null && cache && vg.isCacheable()) {
node.jjtSetValue(vg);
}
return value;
} catch (Exception xany) {
if (node == null) {
throw new RuntimeException(xany);
} else {
JexlException xjexl = new JexlException.Property(node, attribute.toString());
if (strict) {
throw xjexl;
}
if (!silent) {
logger.warn(xjexl.getMessage());
}
}
}
}
return null;
}
/**
* Sets an attribute of an object.
*
* @param object to set the value to
* @param attribute the attribute of the object, e.g. an index (1, 0, 2) or
* key for a map
* @param value the value to assign to the object's attribute
*/
public void setAttribute(Object object, Object attribute, Object value) {
setAttribute(object, attribute, value, null);
}
/**
* Sets an attribute of an object.
*
* @param object to set the value to
* @param attribute the attribute of the object, e.g. an index (1, 0, 2) or
* key for a map
* @param value the value to assign to the object's attribute
* @param node the node that evaluated as the object
*/
protected void setAttribute(Object object, Object attribute, Object value, JexlNode node) {
if (isCancelled()) {
throw new JexlException.Cancel(node);
}
// attempt to reuse last executor cached in volatile JexlNode.value
if (node != null && cache) {
Object cached = node.jjtGetValue();
if (cached instanceof JexlPropertySet) {
JexlPropertySet setter = (JexlPropertySet) cached;
Object eval = setter.tryInvoke(object, attribute, value);
if (!setter.tryFailed(eval)) {
return;
}
}
}
JexlException xjexl = null;
JexlPropertySet vs = uberspect.getPropertySet(object, attribute, value, node);
// if we can't find an exact match, narrow the value argument and try again
if (vs == null) {
// replace all numbers with the smallest type that will fit
Object[] narrow = {value};
if (arithmetic.narrowArguments(narrow)) {
vs = uberspect.getPropertySet(object, attribute, narrow[0], node);
}
}
if (vs != null) {
try {
// cache executor in volatile JexlNode.value
vs.invoke(object, value);
if (node != null && cache && vs.isCacheable()) {
node.jjtSetValue(vs);
}
return;
} catch (RuntimeException xrt) {
if (node == null) {
throw xrt;
}
xjexl = new JexlException(node, "set object property error", xrt);
} catch (Exception xany) {
if (node == null) {
throw new RuntimeException(xany);
}
xjexl = new JexlException(node, "set object property error", xany);
}
}
if (xjexl == null) {
if (node == null) {
String error = "unable to set object property"
+ ", class: " + object.getClass().getName()
+ ", property: " + attribute
+ ", argument: " + value.getClass().getSimpleName();
throw new UnsupportedOperationException(error);
}
xjexl = new JexlException.Property(node, attribute.toString());
}
if (strict) {
throw xjexl;
}
if (!silent) {
logger.warn(xjexl.getMessage());
}
}
/**
* Unused, satisfy ParserVisitor interface.
* @param node a node
* @param data the data
* @return does not return
*/
public Object visit(SimpleNode node, Object data) {
throw new UnsupportedOperationException("Not supported yet.");
}
/**
* Unused, should throw in Parser.
* @param node a node
* @param data the data
* @return does not return
*/
public Object visit(ASTAmbiguous node, Object data) {
throw new UnsupportedOperationException("unexpected type of node");
}
}