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Commons Attributes example source code file (DefaultCachedRepository.java)

This example Commons Attributes source code file (DefaultCachedRepository.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

arraylist, class, class, collection, collection, constructor, empty_collection, hashset, hashset, list, method, methodattributebundle, methodattributebundle, reflection, string, util

The Commons Attributes DefaultCachedRepository.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.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.HashSet;
import java.util.HashMap;

/**
 *
 * @since 2.1
 */
class DefaultCachedRepository implements CachedRepository {
    
    private final static Collection EMPTY_COLLECTION = new ArrayList (0);
    
    private final Collection classAttributes;
    private final Map fields = new HashMap ();
    private final Map methods = new HashMap ();
    private final Map constructors = new HashMap ();
    
    private static class MethodAttributeBundle {
        private Collection attributes = EMPTY_COLLECTION;
        private List parameterAttributes = new ArrayList ();
        private Collection returnAttributes = EMPTY_COLLECTION;
        private final String methodName;
        
        public MethodAttributeBundle (String methodName) {
            this.methodName = methodName;
        }
        
        public Collection getAttributes () {
            return attributes;
        }
        
        public Collection getReturnAttributes () {
            return returnAttributes;
        }
        
        public Collection getParameterAttributes (int index) {
            if (index < 0 || index >= parameterAttributes.size ()) {
                throw new ParameterIndexOutOfBoundsException (methodName, index, parameterAttributes.size ());
            }
            return (Collection) parameterAttributes.get (index);
        }
        
        public void setAttributes (Collection attributes) {
            this.attributes = Collections.unmodifiableCollection (attributes);
        }
        
        public void setReturnAttributes (Collection returnAttributes) {
            this.returnAttributes = Collections.unmodifiableCollection (returnAttributes);
        }
        
        public void addParameterAttributes (Collection parameterAttributes) {
            this.parameterAttributes.add (Collections.unmodifiableCollection (parameterAttributes));
        }
    }
    
    public DefaultCachedRepository (Class clazz, AttributeRepositoryClass repo) {
        
        // ---- Fix up class attributes
        Set tempClassAttributes = new HashSet ();
        
        tempClassAttributes.addAll (repo.getClassAttributes ());
        tempClassAttributes.addAll (getInheritableClassAttributes (clazz.getSuperclass ()));
        Class[] ifs = clazz.getInterfaces ();
        for (int i = 0; i < ifs.length; i++) {
            tempClassAttributes.addAll (getInheritableClassAttributes (ifs[i]));
        }        
        this.classAttributes = Collections.unmodifiableCollection (tempClassAttributes);
        
        // ---- Fix up method attributes
        Method[] methods = clazz.getDeclaredMethods ();
        for (int i = 0; i < methods.length; i++) {
            
            Method m = methods[i];
            String key = Util.getSignature (m);
            MethodAttributeBundle bundle = new MethodAttributeBundle (m.toString ());
            
            List attributeBundle = null;
            if (repo.getMethodAttributes ().containsKey (key)) {
                attributeBundle = (List) repo.getMethodAttributes ().get (key);
            }                
            
            Set attributes = new HashSet ();
            if (attributeBundle != null) {
                attributes.addAll ((Collection) attributeBundle.get (0));
            }
            attributes.addAll (getInheritableMethodAttributes (clazz.getSuperclass (), m.getName (), m.getParameterTypes ()));
            for (int j = 0; j < ifs.length; j++) {
                attributes.addAll (getInheritableMethodAttributes (ifs[j], m.getName (), m.getParameterTypes ()));
            }
            
            if (attributes.size () > 0) {
                bundle.setAttributes (attributes);
            }
            
            // ---- Return value attributes
            attributes = new HashSet ();
            if (attributeBundle != null) {
                attributes.addAll ((Collection) attributeBundle.get (1));
            }
            attributes.addAll (getInheritableReturnAttributes (clazz.getSuperclass (), m.getName (), m.getParameterTypes ()));
            for (int j = 0; j < ifs.length; j++) {
                attributes.addAll (getInheritableReturnAttributes (ifs[j], m.getName (), m.getParameterTypes ()));
            }
            if (attributes.size () > 0) {
                bundle.setReturnAttributes (attributes);
            }
            
            // ---- Parameter attributes
            int numParameters = m.getParameterTypes().length;
            for (int k = 0; k < numParameters; k++) {
                attributes = new HashSet ();
                if (attributeBundle != null) {
                    attributes.addAll ((Collection) attributeBundle.get (k + 2));
                }
                attributes.addAll (getInheritableMethodParameterAttributes (clazz.getSuperclass (), m.getName (), m.getParameterTypes (), k));
                for (int j = 0; j < ifs.length; j++) {
                    attributes.addAll (getInheritableMethodParameterAttributes (ifs[j], m.getName (), m.getParameterTypes (), k));
                }
                                
                bundle.addParameterAttributes (attributes);
            }
            
            this.methods.put (m, bundle);
        }
        
        // --- Just copy constructor attributes (they aren't inherited)
        Constructor[] constructors = clazz.getDeclaredConstructors ();
        for (int i = 0; i < constructors.length; i++) {
            Constructor ctor = constructors[i];
            String key = Util.getSignature (ctor);
            
            if (repo.getConstructorAttributes ().containsKey (key)) {
                List attributeBundle = null;
                attributeBundle = (List) repo.getConstructorAttributes ().get (key);
                MethodAttributeBundle bundle = new MethodAttributeBundle (ctor.toString ());
                
                bundle.setAttributes ((Collection) attributeBundle.get (0));
                // ---- Parameter attributes
                int numParameters = ctor.getParameterTypes().length;
                for (int k = 0; k < numParameters; k++) {
                    bundle.addParameterAttributes ((Collection) attributeBundle.get (k + 1));
                }
                this.constructors.put (ctor, bundle);
            }
        }        
        
        // --- Just copy field attributes (they aren't inherited)
        Field[] fields = clazz.getDeclaredFields ();
        for (int i = 0; i < fields.length; i++) {
            Field f = fields[i];
            String key = f.getName ();
            if (repo.getFieldAttributes ().containsKey (key)) {
                this.fields.put (f, Collections.unmodifiableCollection ((Collection) repo.getFieldAttributes ().get (key)));
            }
        }
    }
    
    private static Collection getInheritableAttributes (Collection attrs) {
        HashSet result = new HashSet ();
        
        Iterator iter = attrs.iterator ();
        while (iter.hasNext ()) {
            Object attr = iter.next ();
            if (Attributes.hasAttributeType (attr.getClass (), Inheritable.class)) {
                result.add (attr);
            }
        }
        return result;
    }
    
    private static Collection getInheritableClassAttributes (Class c) {
        if (c == null) {
            return new ArrayList (0);
        }
        
        HashSet result = new HashSet ();
        result.addAll (getInheritableAttributes (Attributes.getAttributes (c)));
        
        // Traverse the class hierarchy
        result.addAll (getInheritableClassAttributes (c.getSuperclass ()));
        
        // Traverse the interface hierarchy
        Class[] ifs = c.getInterfaces ();
        for (int i = 0; i < ifs.length; i++) {
            result.addAll (getInheritableClassAttributes (ifs[i]));
        }
        
        return result;
    }
    
    private static Collection getInheritableMethodAttributes (Class c, String methodName, Class[] methodParams) {
        if (c == null) {
            return new ArrayList (0);
        }
        
        HashSet result = new HashSet ();
        
        try {
            // Get equivalent method in c
            Method m = c.getDeclaredMethod (methodName, methodParams);
            if ((m.getModifiers () & Modifier.PRIVATE) == 0) {
                result.addAll (getInheritableAttributes (Attributes.getAttributes (m)));
            }
        } catch (NoSuchMethodException nsme) {
        }
        
        // Traverse the class hierarchy
        result.addAll (getInheritableMethodAttributes (c.getSuperclass (), methodName, methodParams));
        
        // Traverse the interface hierarchy
        Class[] ifs = c.getInterfaces ();
        for (int i = 0; i < ifs.length; i++) {
            result.addAll (getInheritableMethodAttributes (ifs[i], methodName, methodParams));
        }
        
        return result;
    }
    
    private static Collection getInheritableMethodParameterAttributes (Class c, String methodName, Class[] methodParams, int parameter) {
        if (c == null) {
            return new ArrayList (0);
        }
        
        HashSet result = new HashSet ();
        
        try {
            // Get equivalent method in c
            Method m = c.getDeclaredMethod (methodName, methodParams);
            if ((m.getModifiers () & Modifier.PRIVATE) == 0) {
                result.addAll (getInheritableAttributes (Attributes.getParameterAttributes (m, parameter)));
            }
        } catch (NoSuchMethodException nsme) {
        }
        
        // Traverse the class hierarchy
        result.addAll (getInheritableMethodParameterAttributes (c.getSuperclass (), methodName, methodParams, parameter));
        
        // Traverse the interface hierarchy
        Class[] ifs = c.getInterfaces ();
        for (int i = 0; i < ifs.length; i++) {
            result.addAll (getInheritableMethodParameterAttributes (ifs[i], methodName, methodParams, parameter));
        }
        
        return result;
    }
    
    private static Collection getInheritableReturnAttributes (Class c, String methodName, Class[] methodParams) {
        if (c == null) {
            return new ArrayList (0);
        }
        
        HashSet result = new HashSet ();
        
        try {
            // Get equivalent method in c
            Method m = c.getDeclaredMethod (methodName, methodParams);
            if ((m.getModifiers () & Modifier.PRIVATE) == 0) {
                result.addAll (getInheritableAttributes (Attributes.getReturnAttributes (m)));
            }
        } catch (NoSuchMethodException nsme) {
        }
        
        // Traverse the class hierarchy
        result.addAll (getInheritableReturnAttributes (c.getSuperclass (), methodName, methodParams));
        
        // Traverse the interface hierarchy
        Class[] ifs = c.getInterfaces ();
        for (int i = 0; i < ifs.length; i++) {
            result.addAll (getInheritableReturnAttributes (ifs[i], methodName, methodParams));
        }
        
        return result;
    }
    
    public Collection getAttributes () {
        return classAttributes;
    }
    
    public Collection getAttributes (Field f) {
        if (fields.containsKey (f)) {
            return (Collection) fields.get (f);
        } else {
            return EMPTY_COLLECTION;
        }
        
    }
    
    public Collection getAttributes (Method m) {
        if (methods.containsKey (m)) {
            return ((MethodAttributeBundle) methods.get (m)).getAttributes ();
        } else {
            return EMPTY_COLLECTION;
        }
    }
    
    public Collection getParameterAttributes (Constructor c, int parameter) {
        if (constructors.containsKey (c)) {
            return ((MethodAttributeBundle) constructors.get (c)).getParameterAttributes (parameter);
        } else {
            return EMPTY_COLLECTION;
        }
    }
    
    public Collection getParameterAttributes (Method m, int parameter) {
        if (methods.containsKey (m)) {
            return ((MethodAttributeBundle) methods.get (m)).getParameterAttributes (parameter);
        } else {
            return EMPTY_COLLECTION;
        }
    }
    
    public Collection getReturnAttributes (Method m) {
        if (methods.containsKey (m)) {
            return ((MethodAttributeBundle) methods.get (m)).getReturnAttributes ();
        } else {
            return EMPTY_COLLECTION;
        }
    }
    
    public Collection getAttributes (Constructor c) {
        if (constructors.containsKey (c)) {
            return ((MethodAttributeBundle) constructors.get (c)).getAttributes ();
        } else {
            return EMPTY_COLLECTION;
        }
    }   
}

Other Commons Attributes examples (source code examples)

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