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231
java/org/apache/el/parser/AstFunction.java
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231
java/org/apache/el/parser/AstFunction.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Generated By:JJTree: Do not edit this line. AstFunction.java */
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package org.apache.el.parser;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import javax.el.ELClass;
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import javax.el.ELException;
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import javax.el.FunctionMapper;
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import javax.el.LambdaExpression;
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import javax.el.ValueExpression;
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import javax.el.VariableMapper;
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import org.apache.el.lang.EvaluationContext;
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import org.apache.el.util.MessageFactory;
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/**
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* @author Jacob Hookom [jacob@hookom.net]
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*/
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public final class AstFunction extends SimpleNode {
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protected String localName = "";
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protected String prefix = "";
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public AstFunction(int id) {
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super(id);
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}
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public String getLocalName() {
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return localName;
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}
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public String getOutputName() {
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if (this.prefix == null) {
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return this.localName;
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} else {
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return this.prefix + ":" + this.localName;
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}
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}
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public String getPrefix() {
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return prefix;
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}
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@Override
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public Class<?> getType(EvaluationContext ctx)
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throws ELException {
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FunctionMapper fnMapper = ctx.getFunctionMapper();
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// quickly validate again for this request
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if (fnMapper == null) {
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throw new ELException(MessageFactory.get("error.fnMapper.null"));
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}
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Method m = fnMapper.resolveFunction(this.prefix, this.localName);
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if (m == null) {
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throw new ELException(MessageFactory.get("error.fnMapper.method",
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this.getOutputName()));
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}
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return m.getReturnType();
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}
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@Override
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public Object getValue(EvaluationContext ctx)
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throws ELException {
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FunctionMapper fnMapper = ctx.getFunctionMapper();
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// quickly validate again for this request
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if (fnMapper == null) {
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throw new ELException(MessageFactory.get("error.fnMapper.null"));
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}
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Method m = fnMapper.resolveFunction(this.prefix, this.localName);
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if (m == null && this.prefix.length() == 0) {
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// TODO: Do we need to think about precedence of the various ways
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// a lambda expression may be obtained from something that
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// the parser thinks is a function?
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Object obj = null;
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if (ctx.isLambdaArgument(this.localName)) {
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obj = ctx.getLambdaArgument(this.localName);
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}
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if (obj == null) {
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper != null) {
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obj = varMapper.resolveVariable(this.localName);
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if (obj instanceof ValueExpression) {
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// See if this returns a LambdaEXpression
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obj = ((ValueExpression) obj).getValue(ctx);
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}
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}
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}
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if (obj == null) {
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obj = ctx.getELResolver().getValue(ctx, null, this.localName);
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}
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if (obj instanceof LambdaExpression) {
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// Build arguments
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int i = 0;
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while (obj instanceof LambdaExpression &&
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i < jjtGetNumChildren()) {
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Node args = jjtGetChild(i);
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obj = ((LambdaExpression) obj).invoke(
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((AstMethodParameters) args).getParameters(ctx));
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i++;
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}
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if (i < jjtGetNumChildren()) {
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// Haven't consumed all the sets of parameters therefore
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// there were too many sets of parameters
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throw new ELException(MessageFactory.get(
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"error.lambda.tooManyMethodParameterSets"));
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}
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return obj;
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}
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// Call to a constructor or a static method
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obj = ctx.getImportHandler().resolveClass(this.localName);
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if (obj != null) {
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return ctx.getELResolver().invoke(ctx, new ELClass((Class<?>) obj), "<init>", null,
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((AstMethodParameters) this.children[0]).getParameters(ctx));
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}
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obj = ctx.getImportHandler().resolveStatic(this.localName);
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if (obj != null) {
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return ctx.getELResolver().invoke(ctx, new ELClass((Class<?>) obj), this.localName,
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null, ((AstMethodParameters) this.children[0]).getParameters(ctx));
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}
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}
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if (m == null) {
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throw new ELException(MessageFactory.get("error.fnMapper.method",
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this.getOutputName()));
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}
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// Not a lambda expression so must be a function. Check there is just a
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// single set of method parameters
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if (this.jjtGetNumChildren() != 1) {
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throw new ELException(MessageFactory.get(
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"error.funciton.tooManyMethodParameterSets",
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getOutputName()));
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}
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Node parameters = jjtGetChild(0);
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Class<?>[] paramTypes = m.getParameterTypes();
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Object[] params = null;
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Object result = null;
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int inputParameterCount = parameters.jjtGetNumChildren();
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int methodParameterCount = paramTypes.length;
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if (inputParameterCount == 0 && methodParameterCount == 1 && m.isVarArgs()) {
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params = new Object[] { null };
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} else if (inputParameterCount > 0) {
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params = new Object[methodParameterCount];
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try {
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for (int i = 0; i < methodParameterCount; i++) {
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if (m.isVarArgs() && i == methodParameterCount - 1) {
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if (inputParameterCount < methodParameterCount) {
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params[i] = new Object[] { null };
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} else if (inputParameterCount == methodParameterCount &&
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paramTypes[i].isArray()) {
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params[i] = parameters.jjtGetChild(i).getValue(ctx);
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} else {
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Object[] varargs =
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new Object[inputParameterCount - methodParameterCount + 1];
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Class<?> target = paramTypes[i].getComponentType();
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for (int j = i; j < inputParameterCount; j++) {
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varargs[j-i] = parameters.jjtGetChild(j).getValue(ctx);
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varargs[j-i] = coerceToType(ctx, varargs[j-i], target);
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}
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params[i] = varargs;
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}
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} else {
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params[i] = parameters.jjtGetChild(i).getValue(ctx);
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}
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params[i] = coerceToType(ctx, params[i], paramTypes[i]);
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}
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} catch (ELException ele) {
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throw new ELException(MessageFactory.get("error.function", this
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.getOutputName()), ele);
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}
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}
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try {
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result = m.invoke(null, params);
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} catch (IllegalAccessException iae) {
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throw new ELException(MessageFactory.get("error.function", this
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.getOutputName()), iae);
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} catch (InvocationTargetException ite) {
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Throwable cause = ite.getCause();
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if (cause instanceof ThreadDeath) {
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throw (ThreadDeath) cause;
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}
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if (cause instanceof VirtualMachineError) {
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throw (VirtualMachineError) cause;
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}
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throw new ELException(MessageFactory.get("error.function", this
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.getOutputName()), cause);
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}
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return result;
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}
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public void setLocalName(String localName) {
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this.localName = localName;
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}
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public void setPrefix(String prefix) {
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this.prefix = prefix;
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}
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@Override
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public String toString()
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{
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return ELParserTreeConstants.jjtNodeName[id] + "[" + this.getOutputName() + "]";
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}
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}
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