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Tomcat example source code file (ELResolverImpl.java)

This example Tomcat source code file (ELResolverImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

class, compositeelresolver, compositeelresolver, elexception, elresolver, elresolverimpl, jsp, nullpointerexception, nullpointerexception, object, object, propertynotfoundexception, propertynotfoundexception, propertynotwritableexception, servlet, util, variableresolver

The Tomcat ELResolverImpl.java source code

/*
 * 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;

public final class ELResolverImpl extends ELResolver {
	
	public final static ELResolver DefaultResolver = new CompositeELResolver();

	static {
		((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;

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

	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 DefaultResolver.getValue(context, base, property);
		}
		return null;
	}

	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 DefaultResolver.getType(context, base, property);
		}
		return null;
	}

	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()) {
			DefaultResolver.setValue(context, base, property, value);
		}
	}

	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 DefaultResolver.isReadOnly(context, base, property);
	}

	public Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
		return DefaultResolver.getFeatureDescriptors(context, base);
	}

	public Class<?> getCommonPropertyType(ELContext context, Object base) {
		if (base == null) {
			return String.class;
		}
		return DefaultResolver.getCommonPropertyType(context, base);
	}

}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat ELResolverImpl.java source code file:

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