Tomcat example source code file (MethodExpressionLiteral.java)

This example Tomcat source code file (MethodExpressionLiteral.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, class, classnotfoundexception, elexception, elexception, externalizable, io, ioexception, methodexpression, methodexpressionliteral, methodexpressionliteral, methodinfo, object, string, string

The Tomcat MethodExpressionLiteral.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.el;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.MethodInfo;

import org.apache.el.lang.ELSupport;
import org.apache.el.util.ReflectionUtil;


public class MethodExpressionLiteral extends MethodExpression implements Externalizable {

    private Class expectedType;

    private String expr;
    
    private Class[] paramTypes;
    
    public MethodExpressionLiteral() {
        // do nothing
    }
    
    public MethodExpressionLiteral(String expr, Class expectedType, Class[] paramTypes) {
        this.expr = expr;
        this.expectedType = expectedType;
        this.paramTypes = paramTypes;
    }

    public MethodInfo getMethodInfo(ELContext context) throws ELException {
        return new MethodInfo(this.expr, this.expectedType, this.paramTypes);
    }

    public Object invoke(ELContext context, Object[] params) throws ELException {
        if (this.expectedType != null) {
            return ELSupport.coerceToType(this.expr, this.expectedType);
        } else {
            return this.expr;
        }
    }

    public String getExpressionString() {
        return this.expr;
    }

    public boolean equals(Object obj) {
        return (obj instanceof MethodExpressionLiteral && this.hashCode() == obj.hashCode());
    }

    public int hashCode() {
        return this.expr.hashCode();
    }

    public boolean isLiteralText() {
        return true;
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        this.expr = in.readUTF();
        String type = in.readUTF();
        if (!"".equals(type)) {
            this.expectedType = ReflectionUtil.forName(type);
        }
        this.paramTypes = ReflectionUtil.toTypeArray(((String[]) in
                .readObject()));
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeUTF(this.expr);
        out.writeUTF((this.expectedType != null) ? this.expectedType.getName()
                : "");
        out.writeObject(ReflectionUtil.toTypeNameArray(this.paramTypes));
    }
}