init
This commit is contained in:
238
java/org/apache/el/parser/AstIdentifier.java
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238
java/org/apache/el/parser/AstIdentifier.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. AstIdentifier.java */
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package org.apache.el.parser;
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import javax.el.ELClass;
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import javax.el.ELException;
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import javax.el.MethodExpression;
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import javax.el.MethodInfo;
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import javax.el.MethodNotFoundException;
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import javax.el.PropertyNotFoundException;
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import javax.el.ValueExpression;
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import javax.el.ValueReference;
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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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import org.apache.el.util.Validation;
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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 AstIdentifier extends SimpleNode {
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public AstIdentifier(int id) {
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super(id);
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}
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@Override
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public Class<?> getType(EvaluationContext ctx) throws ELException {
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper != null) {
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ValueExpression expr = varMapper.resolveVariable(this.image);
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if (expr != null) {
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return expr.getType(ctx.getELContext());
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}
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}
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ctx.setPropertyResolved(false);
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Class<?> result = ctx.getELResolver().getType(ctx, null, this.image);
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if (!ctx.isPropertyResolved()) {
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throw new PropertyNotFoundException(MessageFactory.get(
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"error.resolver.unhandled.null", this.image));
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}
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return result;
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}
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@Override
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public Object getValue(EvaluationContext ctx) throws ELException {
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// Lambda parameters
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if (ctx.isLambdaArgument(this.image)) {
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return ctx.getLambdaArgument(this.image);
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}
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// Variable mapper
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper != null) {
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ValueExpression expr = varMapper.resolveVariable(this.image);
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if (expr != null) {
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return expr.getValue(ctx.getELContext());
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}
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}
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// EL Resolvers
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ctx.setPropertyResolved(false);
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Object result;
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/* Putting the Boolean into the ELContext is part of a performance
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* optimisation for ScopedAttributeELResolver. When looking up "foo",
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* the resolver can't differentiate between ${ foo } and ${ foo.bar }.
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* This is important because the expensive class lookup only needs to
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* be performed in the later case. This flag tells the resolver if the
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* lookup can be skipped.
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*/
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if (parent instanceof AstValue) {
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ctx.putContext(this.getClass(), Boolean.FALSE);
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} else {
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ctx.putContext(this.getClass(), Boolean.TRUE);
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}
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try {
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result = ctx.getELResolver().getValue(ctx, null, this.image);
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} finally {
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// Always reset the flag to false so the optimisation is not applied
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// inappropriately
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ctx.putContext(this.getClass(), Boolean.FALSE);
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}
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if (ctx.isPropertyResolved()) {
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return result;
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}
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// Import
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result = ctx.getImportHandler().resolveClass(this.image);
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if (result != null) {
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return new ELClass((Class<?>) result);
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}
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result = ctx.getImportHandler().resolveStatic(this.image);
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if (result != null) {
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try {
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return ((Class<?>) result).getField(this.image).get(null);
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} catch (IllegalArgumentException | IllegalAccessException
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| NoSuchFieldException | SecurityException e) {
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throw new ELException(e);
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}
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}
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throw new PropertyNotFoundException(MessageFactory.get(
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"error.resolver.unhandled.null", this.image));
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}
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@Override
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public boolean isReadOnly(EvaluationContext ctx) throws ELException {
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper != null) {
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ValueExpression expr = varMapper.resolveVariable(this.image);
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if (expr != null) {
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return expr.isReadOnly(ctx.getELContext());
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}
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}
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ctx.setPropertyResolved(false);
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boolean result = ctx.getELResolver().isReadOnly(ctx, null, this.image);
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if (!ctx.isPropertyResolved()) {
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throw new PropertyNotFoundException(MessageFactory.get(
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"error.resolver.unhandled.null", this.image));
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}
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return result;
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}
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@Override
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public void setValue(EvaluationContext ctx, Object value)
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throws ELException {
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper != null) {
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ValueExpression expr = varMapper.resolveVariable(this.image);
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if (expr != null) {
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expr.setValue(ctx.getELContext(), value);
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return;
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}
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}
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ctx.setPropertyResolved(false);
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ctx.getELResolver().setValue(ctx, null, this.image, value);
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if (!ctx.isPropertyResolved()) {
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throw new PropertyNotFoundException(MessageFactory.get(
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"error.resolver.unhandled.null", this.image));
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}
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}
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@Override
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public Object invoke(EvaluationContext ctx, Class<?>[] paramTypes,
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Object[] paramValues) throws ELException {
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return this.getMethodExpression(ctx).invoke(ctx.getELContext(), paramValues);
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}
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@Override
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public MethodInfo getMethodInfo(EvaluationContext ctx,
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Class<?>[] paramTypes) throws ELException {
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return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext());
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}
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@Override
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public void setImage(String image) {
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if (!Validation.isIdentifier(image)) {
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throw new ELException(MessageFactory.get("error.identifier.notjava",
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image));
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}
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this.image = image;
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}
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@Override
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public ValueReference getValueReference(EvaluationContext ctx) {
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VariableMapper varMapper = ctx.getVariableMapper();
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if (varMapper == null) {
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return null;
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}
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ValueExpression expr = varMapper.resolveVariable(this.image);
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if (expr == null) {
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return null;
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}
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return expr.getValueReference(ctx);
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}
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private final MethodExpression getMethodExpression(EvaluationContext ctx)
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throws ELException {
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Object obj = null;
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// case A: ValueExpression exists, getValue which must
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// be a MethodExpression
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VariableMapper varMapper = ctx.getVariableMapper();
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ValueExpression ve = null;
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if (varMapper != null) {
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ve = varMapper.resolveVariable(this.image);
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if (ve != null) {
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obj = ve.getValue(ctx);
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}
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}
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// case B: evaluate the identity against the ELResolver, again, must be
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// a MethodExpression to be able to invoke
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if (ve == null) {
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ctx.setPropertyResolved(false);
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obj = ctx.getELResolver().getValue(ctx, null, this.image);
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}
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// finally provide helpful hints
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if (obj instanceof MethodExpression) {
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return (MethodExpression) obj;
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} else if (obj == null) {
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throw new MethodNotFoundException("Identity '" + this.image
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+ "' was null and was unable to invoke");
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} else {
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throw new ELException(
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"Identity '"
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+ this.image
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+ "' does not reference a MethodExpression instance, returned type: "
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+ obj.getClass().getName());
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}
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}
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}
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