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/*
 * 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 org.apache.jasper.el;

import java.util.Iterator;

import javax.el.ArrayELResolver;
import javax.el.BeanELResolver;
import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.el.ListELResolver;
import javax.el.MapELResolver;
import javax.el.PropertyNotFoundException;
import javax.el.PropertyNotWritableException;
import javax.el.ResourceBundleELResolver;
import javax.servlet.jsp.el.VariableResolver;

import org.apache.jasper.Constants;

public final class ELResolverImpl extends ELResolver {
    private static final ELResolver DefaultResolver;

    static {
        if (Constants.IS_SECURITY_ENABLED) {
            DefaultResolver = null;
        } else {
            DefaultResolver = new CompositeELResolver();
            ((CompositeELResolver) DefaultResolver).add(new MapELResolver());
            ((CompositeELResolver) DefaultResolver).add(new ResourceBundleELResolver());
            ((CompositeELResolver) DefaultResolver).add(new ListELResolver());
            ((CompositeELResolver) DefaultResolver).add(new ArrayELResolver());
            ((CompositeELResolver) DefaultResolver).add(new BeanELResolver());
        }
    }

    private final VariableResolver variableResolver;
    private final ELResolver elResolver;

    public ELResolverImpl(VariableResolver variableResolver) {
        this.variableResolver = variableResolver;
        this.elResolver = getDefaultResolver();
    }

    @Override
    public Object getValue(ELContext context, Object base, Object property)
            throws NullPointerException, PropertyNotFoundException, ELException {
        if (context == null) {
            throw new NullPointerException();
        }

        if (base == null) {
            context.setPropertyResolved(true);
            if (property != null) {
                try {
                    return this.variableResolver.resolveVariable(property
                            .toString());
                } catch (javax.servlet.jsp.el.ELException e) {
                    throw new ELException(e.getMessage(), e.getCause());
                }
            }
        }

        if (!context.isPropertyResolved()) {
            return elResolver.getValue(context, base, property);
        }
        return null;
    }

    @Override
    public Class getType(ELContext context, Object base, Object property)
            throws NullPointerException, PropertyNotFoundException, ELException {
        if (context == null) {
            throw new NullPointerException();
        }

        if (base == null) {
            context.setPropertyResolved(true);
            if (property != null) {
                try {
                    Object obj = this.variableResolver.resolveVariable(property
                            .toString());
                    return (obj != null) ? obj.getClass() : null;
                } catch (javax.servlet.jsp.el.ELException e) {
                    throw new ELException(e.getMessage(), e.getCause());
                }
            }
        }

        if (!context.isPropertyResolved()) {
            return elResolver.getType(context, base, property);
        }
        return null;
    }

    @Override
    public void setValue(ELContext context, Object base, Object property,
            Object value) throws NullPointerException,
            PropertyNotFoundException, PropertyNotWritableException,
            ELException {
        if (context == null) {
            throw new NullPointerException();
        }

        if (base == null) {
            context.setPropertyResolved(true);
            throw new PropertyNotWritableException(
                    "Legacy VariableResolver wrapped, not writable");
        }

        if (!context.isPropertyResolved()) {
            elResolver.setValue(context, base, property, value);
        }
    }

    @Override
    public boolean isReadOnly(ELContext context, Object base, Object property)
            throws NullPointerException, PropertyNotFoundException, ELException {
        if (context == null) {
            throw new NullPointerException();
        }

        if (base == null) {
            context.setPropertyResolved(true);
            return true;
        }

        return elResolver.isReadOnly(context, base, property);
    }

    @Override
    public Iterator getFeatureDescriptors(ELContext context, Object base) {
        return elResolver.getFeatureDescriptors(context, base);
    }

    @Override
    public Class getCommonPropertyType(ELContext context, Object base) {
        if (base == null) {
            return String.class;
        }
        return elResolver.getCommonPropertyType(context, base);
    }

    public static ELResolver getDefaultResolver() {
        if (Constants.IS_SECURITY_ENABLED) {
            CompositeELResolver defaultResolver = new CompositeELResolver();
            defaultResolver.add(new MapELResolver());
            defaultResolver.add(new ResourceBundleELResolver());
            defaultResolver.add(new ListELResolver());
            defaultResolver.add(new ArrayELResolver());
            defaultResolver.add(new BeanELResolver());
            return defaultResolver;
        } else {
            return DefaultResolver;
        }
    }
}