org.apache.el.parser.AstFunction 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.
*/
/* Generated By:JJTree: Do not edit this line. AstFunction.java */
package org.apache.el.parser;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.el.ELClass;
import javax.el.ELException;
import javax.el.FunctionMapper;
import javax.el.LambdaExpression;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import org.apache.el.lang.EvaluationContext;
import org.apache.el.util.MessageFactory;
/**
* @author Jacob Hookom [[email protected]]
*/
public final class AstFunction extends SimpleNode {
protected String localName = "";
protected String prefix = "";
public AstFunction(int id) {
super(id);
}
public String getLocalName() {
return localName;
}
public String getOutputName() {
if (this.prefix == null) {
return this.localName;
} else {
return this.prefix + ":" + this.localName;
}
}
public String getPrefix() {
return prefix;
}
@Override
public Class getType(EvaluationContext ctx) throws ELException {
FunctionMapper fnMapper = ctx.getFunctionMapper();
// quickly validate again for this request
if (fnMapper == null) {
throw new ELException(MessageFactory.get("error.fnMapper.null"));
}
Method m = fnMapper.resolveFunction(this.prefix, this.localName);
if (m == null) {
throw new ELException(MessageFactory.get("error.fnMapper.method", this.getOutputName()));
}
return m.getReturnType();
}
@Override
public Object getValue(EvaluationContext ctx) throws ELException {
FunctionMapper fnMapper = ctx.getFunctionMapper();
// quickly validate again for this request
if (fnMapper == null) {
throw new ELException(MessageFactory.get("error.fnMapper.null"));
}
Method m = fnMapper.resolveFunction(this.prefix, this.localName);
if (m == null && this.prefix.length() == 0) {
// TODO: Do we need to think about precedence of the various ways
// a lambda expression may be obtained from something that
// the parser thinks is a function?
Object obj = null;
if (ctx.isLambdaArgument(this.localName)) {
obj = ctx.getLambdaArgument(this.localName);
}
if (obj == null) {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
obj = varMapper.resolveVariable(this.localName);
if (obj instanceof ValueExpression) {
// See if this returns a LambdaExpression
obj = ((ValueExpression) obj).getValue(ctx);
}
}
}
if (obj == null) {
obj = ctx.getELResolver().getValue(ctx, null, this.localName);
}
if (obj instanceof LambdaExpression) {
// Build arguments
int i = 0;
while (obj instanceof LambdaExpression && i < jjtGetNumChildren()) {
Node args = jjtGetChild(i);
obj = ((LambdaExpression) obj).invoke(((AstMethodParameters) args).getParameters(ctx));
i++;
}
if (i < jjtGetNumChildren()) {
// Haven't consumed all the sets of parameters therefore
// there were too many sets of parameters
throw new ELException(MessageFactory.get("error.lambda.tooManyMethodParameterSets"));
}
return obj;
}
// Call to a constructor or a static method
obj = ctx.getImportHandler().resolveClass(this.localName);
if (obj != null) {
return ctx.getELResolver().invoke(ctx, new ELClass((Class) obj), "", null,
((AstMethodParameters) this.children[0]).getParameters(ctx));
}
obj = ctx.getImportHandler().resolveStatic(this.localName);
if (obj != null) {
return ctx.getELResolver().invoke(ctx, new ELClass((Class) obj), this.localName, null,
((AstMethodParameters) this.children[0]).getParameters(ctx));
}
}
if (m == null) {
throw new ELException(MessageFactory.get("error.fnMapper.method", this.getOutputName()));
}
// Not a lambda expression so must be a function. Check there is just a
// single set of method parameters
if (this.jjtGetNumChildren() != 1) {
throw new ELException(MessageFactory.get("error.function.tooManyMethodParameterSets", getOutputName()));
}
Node parameters = jjtGetChild(0);
Class[] paramTypes = m.getParameterTypes();
Object[] params = null;
Object result = null;
int inputParameterCount = parameters.jjtGetNumChildren();
int methodParameterCount = paramTypes.length;
if (inputParameterCount == 0 && methodParameterCount == 1 && m.isVarArgs()) {
params = new Object[] { null };
} else if (inputParameterCount > 0) {
params = new Object[methodParameterCount];
try {
for (int i = 0; i < methodParameterCount; i++) {
if (m.isVarArgs() && i == methodParameterCount - 1) {
if (inputParameterCount < methodParameterCount) {
params[i] = new Object[] { null };
} else if (inputParameterCount == methodParameterCount && isArray(parameters.jjtGetChild(i).getValue(ctx))) {
params[i] = parameters.jjtGetChild(i).getValue(ctx);
} else {
Object[] varargs = new Object[inputParameterCount - methodParameterCount + 1];
Class target = paramTypes[i].getComponentType();
for (int j = i; j < inputParameterCount; j++) {
varargs[j - i] = parameters.jjtGetChild(j).getValue(ctx);
varargs[j - i] = coerceToType(ctx, varargs[j - i], target);
}
params[i] = varargs;
}
} else {
params[i] = parameters.jjtGetChild(i).getValue(ctx);
}
params[i] = coerceToType(ctx, params[i], paramTypes[i]);
}
} catch (ELException ele) {
throw new ELException(MessageFactory.get("error.function", this.getOutputName()), ele);
}
}
try {
result = m.invoke(null, params);
} catch (IllegalAccessException iae) {
throw new ELException(MessageFactory.get("error.function", this.getOutputName()), iae);
} catch (InvocationTargetException ite) {
Throwable cause = ite.getCause();
if (cause instanceof ThreadDeath) {
throw (ThreadDeath) cause;
}
if (cause instanceof VirtualMachineError) {
throw (VirtualMachineError) cause;
}
throw new ELException(MessageFactory.get("error.function", this.getOutputName()), cause);
}
return result;
}
private boolean isArray(Object obj) {
if (obj == null) {
return false;
}
return obj.getClass().isArray();
}
public void setLocalName(String localName) {
this.localName = localName;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
@Override
public String toString() {
return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
}
}