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Commons Attributes example source code file (Util.java)

This example Commons Attributes source code file (Util.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 - Commons Attributes tags/keywords

class, collection, collection, illegalargumentexception, iterator, iterator, list, map, object, reflection, string, string, stringbuffer, stringbuffer, target, util

The Commons Attributes Util.java source code

/*
 * Copyright 2003-2004 The Apache Software Foundation
 * 
 * Licensed 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.commons.attributes;

import java.lang.reflect.Field;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import java.util.List;
import java.util.Iterator;
import java.util.Set;
import java.util.Map;
import java.util.Collection;

class Util {
    
    public static String getSignature (Method m) {
        return m.getName () + "(" + getParameterList (m.getParameterTypes ()) + ")";
    }
    
    public static String getSignature (Constructor c) {
        return "(" + getParameterList (c.getParameterTypes ()) + ")";
    }
    
    public static String decodedClassName (String rawName) throws IllegalArgumentException {
        if (!rawName.startsWith ("[")) {
            return rawName;
        } else {
            StringBuffer nesting = new StringBuffer ();
            int i = 0;
            while (rawName.charAt (i) == '[') {
                nesting.append ("[]");
                i++;
            }
            String type = "";
            switch (rawName.charAt (i)) {
            case 'B': type = "byte"; break;
            case 'C': type = "char"; break;
            case 'D': type = "double"; break;
            case 'F': type = "float"; break;
            case 'I': type = "int"; break;
            case 'J': type = "long"; break;
            case 'L': type = rawName.substring (i + 1, rawName.length () - 1); break;
            case 'S': type = "short"; break;
            case 'Z': type = "boolean"; break;
            default: throw new IllegalArgumentException ("Can't decode " + rawName);
            } 
            
            return type + nesting.toString ();
        }
    }
    
    public static String getParameterList (Class[] params) {
        StringBuffer sb = new StringBuffer ();
        for (int i = 0; i < params.length; i++) {
            if (i > 0) {
                sb.append (",");
            }
            sb.append (decodedClassName (params[i].getName ()));                
        }
        return sb.toString ();
    }
    
    private static void checkTarget (int target, Object attribute, String element) {
        Target targetAttr = (Target) Attributes.getAttribute (attribute.getClass (), Target.class);
        if (targetAttr == null) {
            return;
        }        
        
        if ((targetAttr.getFlags () & target) == 0) {
            throw new InvalidAttributeTargetError (attribute.getClass ().getName (), element, targetAttr.getFlags ());
        }
    }
    
    private static void checkTargets (int target, Collection attributes, String element) {
        Iterator iter = attributes.iterator ();
        while (iter.hasNext ()) {
            checkTarget (target, iter.next (), element);
        }
    }
    
    public static void validateRepository (Class owningClass, AttributeRepositoryClass repo) {
        checkTargets (Target.CLASS, repo.getClassAttributes (), owningClass.getName ());
        
        Map fieldAttrs = repo.getFieldAttributes ();
        for (Iterator iter = fieldAttrs.keySet ().iterator(); iter.hasNext ();) {
            String fieldName = (String) iter.next ();
            
            checkTargets (Target.FIELD, (Collection) fieldAttrs.get (fieldName), owningClass.getName () + "." + fieldName);
        }
        
        Map ctorAttrs = repo.getConstructorAttributes ();
        for (Iterator iter = ctorAttrs.keySet ().iterator(); iter.hasNext ();) {
            String ctorName = (String) iter.next ();
            List bundle = (List) ctorAttrs.get (ctorName);
            
            for (int i = 0; i < bundle.size (); i++) {
                switch (i) {
                case 0: 
                    checkTargets (Target.CONSTRUCTOR, (Collection) bundle.get (0), owningClass.getName () + "." + ctorName);
                    break;
                    
                default:
                    checkTargets (Target.CONSTRUCTOR_PARAMETER, (Collection) bundle.get (i), "parameter " + (i) + " of " + owningClass.getName () + ctorName);
                }
            }
        }
        
        Map methodAttrs = repo.getMethodAttributes ();
        for (Iterator iter = methodAttrs.keySet ().iterator(); iter.hasNext ();) {
            String methodName = (String) iter.next ();
            List bundle = (List) methodAttrs.get (methodName);
            
            for (int i = 0; i < bundle.size (); i++) {
                switch (i) {
                case 0: 
                    checkTargets (Target.METHOD, (Collection) bundle.get (0), owningClass.getName () + "." + methodName);
                    break;
                    
                case 1:
                    checkTargets (Target.RETURN, (Collection) bundle.get (1), "return value of " + owningClass.getName () + "." + methodName);
                    break;
                    
                default:
                    checkTargets (Target.METHOD_PARAMETER, (Collection) bundle.get (i), "parameter " + (i - 1) + " of " + owningClass.getName () + "." + methodName);
                }
            }
        }
    }
}

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