Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/Sources/formale Sprachen/Java/Tomcat/java/jakarta/el/ (Apache Software Stiftung Version 11.0^©) Datei vom 10.10.2023 mit Größe 6 kB

Quelle StandardELContext.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.
*/
package jakarta.el;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

/**
* @since EL 3.0
*/
public class StandardELContext extends ELContext {

    private final ELContext wrappedContext;
    private final VariableMapper variableMapper;
    private final FunctionMapper functionMapper;
    private final CompositeELResolver standardResolver;
    private final CompositeELResolver customResolvers;
    private final Map<String,Object> localBeans = new HashMap<>();

    public StandardELContext(ExpressionFactory factory) {
        wrappedContext = null;
        variableMapper = new StandardVariableMapper();
        functionMapper = new StandardFunctionMapper(factory.getInitFunctionMap());
        standardResolver = new CompositeELResolver();
        customResolvers = new CompositeELResolver();

        ELResolver streamResolver = factory.getStreamELResolver();

        // Add resolvers in order
        standardResolver.add(new BeanNameELResolver(new StandardBeanNameResolver(localBeans)));
        standardResolver.add(customResolvers);
        if (streamResolver != null) {
            standardResolver.add(streamResolver);
        }
        standardResolver.add(new StaticFieldELResolver());
        standardResolver.add(new MapELResolver());
        standardResolver.add(new ResourceBundleELResolver());
        standardResolver.add(new ListELResolver());
        standardResolver.add(new ArrayELResolver());
        standardResolver.add(new BeanELResolver());
    }

    public StandardELContext(ELContext context) {
        wrappedContext = context;
        variableMapper = context.getVariableMapper();
        functionMapper = context.getFunctionMapper();
        standardResolver = new CompositeELResolver();
        customResolvers = new CompositeELResolver();

        // Add resolvers in order
        standardResolver.add(new BeanNameELResolver(new StandardBeanNameResolver(localBeans)));
        standardResolver.add(customResolvers);
        // Use resolvers from context from this point on
        standardResolver.add(context.getELResolver());
    }

    @Override
    public void putContext(Class<?> key, Object contextObject) {
        if (wrappedContext == null) {
            super.putContext(key, contextObject);
        } else {
            wrappedContext.putContext(key, contextObject);
        }
    }

    @Override
    public Object getContext(Class<?> key) {
        if (wrappedContext == null) {
            return super.getContext(key);
        } else {
            return wrappedContext.getContext(key);
        }
    }

    @Override
    public ELResolver getELResolver() {
        return standardResolver;
    }

    public void addELResolver(ELResolver resolver) {
        customResolvers.add(resolver);
    }

    @Override
    public FunctionMapper getFunctionMapper() {
        return functionMapper;
    }

    @Override
    public VariableMapper getVariableMapper() {
        return variableMapper;
    }

    Map<String,Object> getLocalBeans() {
        return localBeans;
    }

    private static class StandardVariableMapper extends VariableMapper {

        private Map<String,ValueExpression> vars;

        @Override
        public ValueExpression resolveVariable(String variable) {
            if (vars == null) {
                return null;
            }
            return vars.get(variable);
        }

        @Override
        public ValueExpression setVariable(String variable, ValueExpression expression) {
            if (vars == null) {
                vars = new HashMap<>();
            }
            if (expression == null) {
                return vars.remove(variable);
            } else {
                return vars.put(variable, expression);
            }
        }
    }

    private static class StandardBeanNameResolver extends BeanNameResolver {

        private final Map<String,Object> beans;

        StandardBeanNameResolver(Map<String,Object> beans) {
            this.beans = beans;
        }

        @Override
        public boolean isNameResolved(String beanName) {
            return beans.containsKey(beanName);
        }

        @Override
        public Object getBean(String beanName) {
            return beans.get(beanName);
        }

        @Override
        public void setBeanValue(String beanName, Object value) throws PropertyNotWritableException {
            beans.put(beanName, value);
        }

        @Override
        public boolean isReadOnly(String beanName) {
            return false;
        }

        @Override
        public boolean canCreateBean(String beanName) {
            return true;
        }
    }

    private static class StandardFunctionMapper extends FunctionMapper {

        private final Map<String,Method> methods = new HashMap<>();

        StandardFunctionMapper(Map<String,Method> initFunctionMap) {
            if (initFunctionMap != null) {
                methods.putAll(initFunctionMap);
            }
        }

        @Override
        public Method resolveFunction(String prefix, String localName) {
            String key = prefix + ':' + localName;
            return methods.get(key);
        }

        @Override
        public void mapFunction(String prefix, String localName, Method method) {
            String key = prefix + ':' + localName;
            if (method == null) {
                methods.remove(key);
            } else {
                methods.put(key, method);
            }
        }
    }
}

quality99%

¤ Dauer der Verarbeitung: 0.17 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.