| /* |
| * 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. AstIdentifier.java */ |
| |
| package org.apache.el.parser; |
| |
| import javax.el.ELClass; |
| import javax.el.ELException; |
| import javax.el.MethodExpression; |
| import javax.el.MethodInfo; |
| import javax.el.MethodNotFoundException; |
| import javax.el.PropertyNotFoundException; |
| import javax.el.ValueExpression; |
| import javax.el.ValueReference; |
| import javax.el.VariableMapper; |
| |
| import org.apache.el.lang.EvaluationContext; |
| import org.apache.el.util.MessageFactory; |
| import org.apache.el.util.Validation; |
| |
| |
| /** |
| * @author Jacob Hookom [jacob@hookom.net] |
| */ |
| public final class AstIdentifier extends SimpleNode { |
| public AstIdentifier(int id) { |
| super(id); |
| } |
| |
| @Override |
| public Class<?> getType(EvaluationContext ctx) throws ELException { |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| if (varMapper != null) { |
| ValueExpression expr = varMapper.resolveVariable(this.image); |
| if (expr != null) { |
| return expr.getType(ctx.getELContext()); |
| } |
| } |
| ctx.setPropertyResolved(false); |
| Class<?> result = ctx.getELResolver().getType(ctx, null, this.image); |
| if (!ctx.isPropertyResolved()) { |
| throw new PropertyNotFoundException(MessageFactory.get( |
| "error.resolver.unhandled.null", this.image)); |
| } |
| return result; |
| } |
| |
| @Override |
| public Object getValue(EvaluationContext ctx) throws ELException { |
| // Lambda parameters |
| if (ctx.isLambdaArgument(this.image)) { |
| return ctx.getLambdaArgument(this.image); |
| } |
| |
| // Variable mapper |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| if (varMapper != null) { |
| ValueExpression expr = varMapper.resolveVariable(this.image); |
| if (expr != null) { |
| return expr.getValue(ctx.getELContext()); |
| } |
| } |
| |
| // EL Resolvers |
| ctx.setPropertyResolved(false); |
| Object result; |
| /* Putting the Boolean into the ELContext is part of a performance |
| * optimisation for ScopedAttributeELResolver. When looking up "foo", |
| * the resolver can't differentiate between ${ foo } and ${ foo.bar }. |
| * This is important because the expensive class lookup only needs to |
| * be performed in the later case. This flag tells the resolver if the |
| * lookup can be skipped. |
| */ |
| if (parent instanceof AstValue) { |
| ctx.putContext(this.getClass(), Boolean.FALSE); |
| } else { |
| ctx.putContext(this.getClass(), Boolean.TRUE); |
| } |
| try { |
| result = ctx.getELResolver().getValue(ctx, null, this.image); |
| } finally { |
| // Always reset the flag to false so the optimisation is not applied |
| // inappropriately |
| ctx.putContext(this.getClass(), Boolean.FALSE); |
| } |
| |
| if (ctx.isPropertyResolved()) { |
| return result; |
| } |
| |
| // Import |
| result = ctx.getImportHandler().resolveClass(this.image); |
| if (result != null) { |
| return new ELClass((Class<?>) result); |
| } |
| result = ctx.getImportHandler().resolveStatic(this.image); |
| if (result != null) { |
| try { |
| return ((Class<?>) result).getField(this.image).get(null); |
| } catch (IllegalArgumentException | IllegalAccessException |
| | NoSuchFieldException | SecurityException e) { |
| throw new ELException(e); |
| } |
| } |
| |
| throw new PropertyNotFoundException(MessageFactory.get( |
| "error.resolver.unhandled.null", this.image)); |
| } |
| |
| @Override |
| public boolean isReadOnly(EvaluationContext ctx) throws ELException { |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| if (varMapper != null) { |
| ValueExpression expr = varMapper.resolveVariable(this.image); |
| if (expr != null) { |
| return expr.isReadOnly(ctx.getELContext()); |
| } |
| } |
| ctx.setPropertyResolved(false); |
| boolean result = ctx.getELResolver().isReadOnly(ctx, null, this.image); |
| if (!ctx.isPropertyResolved()) { |
| throw new PropertyNotFoundException(MessageFactory.get( |
| "error.resolver.unhandled.null", this.image)); |
| } |
| return result; |
| } |
| |
| @Override |
| public void setValue(EvaluationContext ctx, Object value) |
| throws ELException { |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| if (varMapper != null) { |
| ValueExpression expr = varMapper.resolveVariable(this.image); |
| if (expr != null) { |
| expr.setValue(ctx.getELContext(), value); |
| return; |
| } |
| } |
| ctx.setPropertyResolved(false); |
| ctx.getELResolver().setValue(ctx, null, this.image, value); |
| if (!ctx.isPropertyResolved()) { |
| throw new PropertyNotFoundException(MessageFactory.get( |
| "error.resolver.unhandled.null", this.image)); |
| } |
| } |
| |
| @Override |
| public Object invoke(EvaluationContext ctx, Class<?>[] paramTypes, |
| Object[] paramValues) throws ELException { |
| return this.getMethodExpression(ctx).invoke(ctx.getELContext(), paramValues); |
| } |
| |
| |
| @Override |
| public MethodInfo getMethodInfo(EvaluationContext ctx, |
| Class<?>[] paramTypes) throws ELException { |
| return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext()); |
| } |
| |
| @Override |
| public void setImage(String image) { |
| if (!Validation.isIdentifier(image)) { |
| throw new ELException(MessageFactory.get("error.identifier.notjava", |
| image)); |
| } |
| this.image = image; |
| } |
| |
| |
| @Override |
| public ValueReference getValueReference(EvaluationContext ctx) { |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| |
| if (varMapper == null) { |
| return null; |
| } |
| |
| ValueExpression expr = varMapper.resolveVariable(this.image); |
| |
| if (expr == null) { |
| return null; |
| } |
| |
| return expr.getValueReference(ctx); |
| } |
| |
| |
| private final MethodExpression getMethodExpression(EvaluationContext ctx) |
| throws ELException { |
| Object obj = null; |
| |
| // case A: ValueExpression exists, getValue which must |
| // be a MethodExpression |
| VariableMapper varMapper = ctx.getVariableMapper(); |
| ValueExpression ve = null; |
| if (varMapper != null) { |
| ve = varMapper.resolveVariable(this.image); |
| if (ve != null) { |
| obj = ve.getValue(ctx); |
| } |
| } |
| |
| // case B: evaluate the identity against the ELResolver, again, must be |
| // a MethodExpression to be able to invoke |
| if (ve == null) { |
| ctx.setPropertyResolved(false); |
| obj = ctx.getELResolver().getValue(ctx, null, this.image); |
| } |
| |
| // finally provide helpful hints |
| if (obj instanceof MethodExpression) { |
| return (MethodExpression) obj; |
| } else if (obj == null) { |
| throw new MethodNotFoundException("Identity '" + this.image |
| + "' was null and was unable to invoke"); |
| } else { |
| throw new ELException( |
| "Identity '" |
| + this.image |
| + "' does not reference a MethodExpression instance, returned type: " |
| + obj.getClass().getName()); |
| } |
| } |
| } |