Quelle AstIdentifier.java Sprache: JAVA

/*
* 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 jakarta.el.ELClass;
import jakarta.el.ELException;
import jakarta.el.MethodExpression;
import jakarta.el.MethodInfo;
import jakarta.el.MethodNotFoundException;
import jakarta.el.MethodReference;
import jakarta.el.PropertyNotFoundException;
import jakarta.el.ValueExpression;
import jakarta.el.ValueReference;
import jakarta.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 MethodReference getMethodReference(EvaluationContext ctx) {
        return this.getMethodExpression(ctx).getMethodReference(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 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(MessageFactory.get("error.identifier.noMethod", this.image));
        } else {
            throw new ELException(MessageFactory.get("error.identifier.notMethodExpression", this.image, obj.getClass().getName()));
        }
    }
}

quality93%

¤ Dauer der Verarbeitung: 0.20 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.