| /* |
| * 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. |
| */ |
| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * 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 java.lang.reflect; |
| |
| import java.lang.annotation.Annotation; |
| import libcore.util.EmptyArray; |
| import org.apache.harmony.kernel.vm.StringUtils; |
| import org.apache.harmony.luni.lang.reflect.GenericSignatureParser; |
| import org.apache.harmony.luni.lang.reflect.ListOfTypes; |
| import org.apache.harmony.luni.lang.reflect.Types; |
| |
| /** |
| * This class represents a constructor. Information about the constructor can be |
| * accessed, and the constructor can be invoked dynamically. |
| * |
| * @param <T> the class that declares this constructor |
| */ |
| public final class Constructor<T> extends AccessibleObject implements GenericDeclaration, |
| Member { |
| |
| Class<T> declaringClass; |
| |
| Class<?>[] parameterTypes; |
| |
| Class<?>[] exceptionTypes; |
| |
| ListOfTypes genericExceptionTypes; |
| ListOfTypes genericParameterTypes; |
| TypeVariable<Constructor<T>>[] formalTypeParameters; |
| private volatile boolean genericTypesAreInitialized = false; |
| |
| private synchronized void initGenericTypes() { |
| if (!genericTypesAreInitialized) { |
| String signatureAttribute = getSignatureAttribute(); |
| GenericSignatureParser parser = new GenericSignatureParser( |
| declaringClass.getClassLoader()); |
| parser.parseForConstructor(this, signatureAttribute, exceptionTypes); |
| formalTypeParameters = parser.formalTypeParameters; |
| genericParameterTypes = parser.parameterTypes; |
| genericExceptionTypes = parser.exceptionTypes; |
| genericTypesAreInitialized = true; |
| } |
| } |
| |
| int slot; |
| |
| /** |
| * Prevent this class from being instantiated. |
| */ |
| private Constructor(){ |
| //do nothing |
| } |
| |
| /** |
| * Creates an instance of the class. Only called from native code, thus |
| * private. |
| * |
| * @param declaringClass |
| * the class this constructor object belongs to |
| * @param ptypes |
| * the parameter types of the constructor |
| * @param extypes |
| * the exception types of the constructor |
| * @param slot |
| * the slot of the constructor inside the VM class structure |
| */ |
| private Constructor (Class<T> declaringClass, Class<?>[] ptypes, Class<?>[] extypes, int slot){ |
| this.declaringClass = declaringClass; |
| this.parameterTypes = ptypes; |
| this.exceptionTypes = extypes; // may be null |
| this.slot = slot; |
| } |
| |
| @Override /*package*/ String getSignatureAttribute() { |
| Object[] annotation = Method.getSignatureAnnotation(declaringClass, slot); |
| |
| if (annotation == null) { |
| return null; |
| } |
| |
| return StringUtils.combineStrings(annotation); |
| } |
| |
| public TypeVariable<Constructor<T>>[] getTypeParameters() { |
| initGenericTypes(); |
| return formalTypeParameters.clone(); |
| } |
| |
| /** |
| * Returns the string representation of the constructor's declaration, |
| * including the type parameters. |
| * |
| * @return the string representation of the constructor's declaration |
| */ |
| public String toGenericString() { |
| StringBuilder sb = new StringBuilder(80); |
| initGenericTypes(); |
| // append modifiers if any |
| int modifier = getModifiers(); |
| if (modifier != 0) { |
| sb.append(Modifier.toString(modifier & ~Modifier.VARARGS)).append(' '); |
| } |
| // append type parameters |
| if (formalTypeParameters != null && formalTypeParameters.length > 0) { |
| sb.append('<'); |
| for (int i = 0; i < formalTypeParameters.length; i++) { |
| appendGenericType(sb, formalTypeParameters[i]); |
| if (i < formalTypeParameters.length - 1) { |
| sb.append(","); |
| } |
| } |
| sb.append("> "); |
| } |
| // append constructor name |
| appendTypeName(sb, getDeclaringClass()); |
| // append parameters |
| sb.append('('); |
| appendArrayGenericType(sb, |
| Types.getClonedTypeArray(genericParameterTypes)); |
| sb.append(')'); |
| // append exceptions if any |
| Type[] genericExceptionTypeArray = |
| Types.getClonedTypeArray(genericExceptionTypes); |
| if (genericExceptionTypeArray.length > 0) { |
| sb.append(" throws "); |
| appendArrayGenericType(sb, genericExceptionTypeArray); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Returns the generic parameter types as an array of {@code Type} |
| * instances, in declaration order. If this constructor has no generic |
| * parameters, an empty array is returned. |
| * |
| * @return the parameter types |
| * |
| * @throws GenericSignatureFormatError |
| * if the generic constructor signature is invalid |
| * @throws TypeNotPresentException |
| * if any parameter type points to a missing type |
| * @throws MalformedParameterizedTypeException |
| * if any parameter type points to a type that cannot be |
| * instantiated for some reason |
| */ |
| public Type[] getGenericParameterTypes() { |
| initGenericTypes(); |
| return Types.getClonedTypeArray(genericParameterTypes); |
| } |
| |
| /** |
| * Returns the exception types as an array of {@code Type} instances. If |
| * this constructor has no declared exceptions, an empty array will be |
| * returned. |
| * |
| * @return an array of generic exception types |
| * |
| * @throws GenericSignatureFormatError |
| * if the generic constructor signature is invalid |
| * @throws TypeNotPresentException |
| * if any exception type points to a missing type |
| * @throws MalformedParameterizedTypeException |
| * if any exception type points to a type that cannot be |
| * instantiated for some reason |
| */ |
| public Type[] getGenericExceptionTypes() { |
| initGenericTypes(); |
| return Types.getClonedTypeArray(genericExceptionTypes); |
| } |
| |
| @Override |
| public Annotation[] getDeclaredAnnotations() { |
| return Method.getDeclaredAnnotations(declaringClass, slot); |
| } |
| |
| @Override public <A extends Annotation> A getAnnotation(Class<A> annotationType) { |
| if (annotationType == null) { |
| throw new NullPointerException("annotationType == null"); |
| } |
| return Method.getAnnotation(declaringClass, slot, annotationType); |
| } |
| |
| @Override public boolean isAnnotationPresent(Class<? extends Annotation> annotationType) { |
| if (annotationType == null) { |
| throw new NullPointerException("annotationType == null"); |
| } |
| return Method.isAnnotationPresent(declaringClass, slot, annotationType); |
| } |
| |
| /** |
| * Returns an array of arrays that represent the annotations of the formal |
| * parameters of this constructor. If there are no parameters on this |
| * constructor, then an empty array is returned. If there are no annotations |
| * set, then an array of empty arrays is returned. |
| * |
| * @return an array of arrays of {@code Annotation} instances |
| */ |
| public Annotation[][] getParameterAnnotations() { |
| Annotation[][] parameterAnnotations |
| = Method.getParameterAnnotations(declaringClass, slot); |
| if (parameterAnnotations.length == 0) { |
| return Method.noAnnotations(parameterTypes.length); |
| } |
| return parameterAnnotations; |
| } |
| |
| /** |
| * Indicates whether or not this constructor takes a variable number of |
| * arguments. |
| * |
| * @return {@code true} if a vararg is declare, otherwise |
| * {@code false} |
| */ |
| public boolean isVarArgs() { |
| int mods = Method.getMethodModifiers(declaringClass, slot); |
| return (mods & Modifier.VARARGS) != 0; |
| } |
| |
| /** |
| * Indicates whether or not this constructor is synthetic (artificially |
| * introduced by the compiler). |
| * |
| * @return {@code true} if this constructor is synthetic, {@code false} |
| * otherwise |
| */ |
| public boolean isSynthetic() { |
| int mods = Method.getMethodModifiers(declaringClass, slot); |
| return (mods & Modifier.SYNTHETIC) != 0; |
| } |
| |
| /** |
| * Indicates whether or not the specified {@code object} is equal to this |
| * constructor. To be equal, the specified object must be an instance |
| * of {@code Constructor} with the same declaring class and parameter types |
| * as this constructor. |
| * |
| * @param object |
| * the object to compare |
| * |
| * @return {@code true} if the specified object is equal to this |
| * constructor, {@code false} otherwise |
| * |
| * @see #hashCode |
| */ |
| @Override |
| public boolean equals(Object object) { |
| return object instanceof Constructor && toString().equals(object.toString()); |
| } |
| |
| /** |
| * Returns the class that declares this constructor. |
| * |
| * @return the declaring class |
| */ |
| public Class<T> getDeclaringClass() { |
| return declaringClass; |
| } |
| |
| /** |
| * Returns the exception types as an array of {@code Class} instances. If |
| * this constructor has no declared exceptions, an empty array will be |
| * returned. |
| * |
| * @return the declared exception classes |
| */ |
| public Class<?>[] getExceptionTypes() { |
| if (exceptionTypes == null) { |
| return EmptyArray.CLASS; |
| } |
| return exceptionTypes.clone(); |
| } |
| |
| /** |
| * Returns the modifiers for this constructor. The {@link Modifier} class |
| * should be used to decode the result. |
| * |
| * @return the modifiers for this constructor |
| * |
| * @see Modifier |
| */ |
| public int getModifiers() { |
| return Method.getMethodModifiers(declaringClass, slot); |
| } |
| |
| /** |
| * Returns the name of this constructor. |
| * |
| * @return the name of this constructor |
| */ |
| public String getName() { |
| return declaringClass.getName(); |
| } |
| |
| /** |
| * Returns an array of the {@code Class} objects associated with the |
| * parameter types of this constructor. If the constructor was declared with |
| * no parameters, an empty array will be returned. |
| * |
| * @return the parameter types |
| */ |
| public Class<?>[] getParameterTypes() { |
| return parameterTypes.clone(); |
| } |
| |
| /** |
| * Returns the constructor's signature in non-printable form. This is called |
| * (only) from IO native code and needed for deriving the serialVersionUID |
| * of the class |
| * |
| * @return the constructor's signature |
| */ |
| @SuppressWarnings("unused") |
| private String getSignature() { |
| StringBuilder result = new StringBuilder(); |
| |
| result.append('('); |
| for (int i = 0; i < parameterTypes.length; i++) { |
| result.append(getSignature(parameterTypes[i])); |
| } |
| result.append(")V"); |
| |
| return result.toString(); |
| } |
| |
| /** |
| * Returns an integer hash code for this constructor. Constructors which are |
| * equal return the same value for this method. The hash code for a |
| * Constructor is the hash code of the name of the declaring class. |
| * |
| * @return the hash code |
| * |
| * @see #equals |
| */ |
| @Override |
| public int hashCode() { |
| return declaringClass.getName().hashCode(); |
| } |
| |
| /** |
| * Returns a new instance of the declaring class, initialized by dynamically |
| * invoking the constructor represented by this {@code Constructor} object. |
| * This reproduces the effect of {@code new declaringClass(arg1, arg2, ... , |
| * argN)} This method performs the following: |
| * <ul> |
| * <li>A new instance of the declaring class is created. If the declaring |
| * class cannot be instantiated (i.e. abstract class, an interface, an array |
| * type, or a primitive type) then an InstantiationException is thrown.</li> |
| * <li>If this Constructor object is enforcing access control (see |
| * {@link AccessibleObject}) and this constructor is not accessible from the |
| * current context, an IllegalAccessException is thrown.</li> |
| * <li>If the number of arguments passed and the number of parameters do not |
| * match, an IllegalArgumentException is thrown.</li> |
| * <li>For each argument passed: |
| * <ul> |
| * <li>If the corresponding parameter type is a primitive type, the argument |
| * is unboxed. If the unboxing fails, an IllegalArgumentException is |
| * thrown.</li> |
| * <li>If the resulting argument cannot be converted to the parameter type |
| * via a widening conversion, an IllegalArgumentException is thrown.</li> |
| * </ul> |
| * <li>The constructor represented by this {@code Constructor} object is |
| * then invoked. If an exception is thrown during the invocation, it is |
| * caught and wrapped in an InvocationTargetException. This exception is |
| * then thrown. If the invocation completes normally, the newly initialized |
| * object is returned. |
| * </ul> |
| * |
| * @param args |
| * the arguments to the constructor |
| * |
| * @return the new, initialized, object |
| * |
| * @exception InstantiationException |
| * if the class cannot be instantiated |
| * @exception IllegalAccessException |
| * if this constructor is not accessible |
| * @exception IllegalArgumentException |
| * if an incorrect number of arguments are passed, or an |
| * argument could not be converted by a widening conversion |
| * @exception InvocationTargetException |
| * if an exception was thrown by the invoked constructor |
| * |
| * @see AccessibleObject |
| */ |
| public T newInstance(Object... args) throws InstantiationException, IllegalAccessException, |
| IllegalArgumentException, InvocationTargetException { |
| return constructNative (args, declaringClass, parameterTypes, slot, flag); |
| } |
| |
| private native T constructNative(Object[] args, Class<T> declaringClass, |
| Class<?>[] parameterTypes, int slot, |
| boolean noAccessCheck) throws InstantiationException, IllegalAccessException, |
| InvocationTargetException; |
| |
| /** |
| * Returns a string containing a concise, human-readable description of this |
| * constructor. The format of the string is: |
| * |
| * <ol> |
| * <li>modifiers (if any) |
| * <li>declaring class name |
| * <li>'(' |
| * <li>parameter types, separated by ',' (if any) |
| * <li>')' |
| * <li>'throws' plus exception types, separated by ',' (if any) |
| * </ol> |
| * |
| * For example: |
| * {@code public String(byte[],String) throws UnsupportedEncodingException} |
| * |
| * @return a printable representation for this constructor |
| */ |
| @Override |
| public String toString() { |
| StringBuilder result = new StringBuilder(Modifier.toString(getModifiers())); |
| |
| if (result.length() != 0) |
| result.append(' '); |
| result.append(declaringClass.getName()); |
| result.append("("); |
| result.append(toString(parameterTypes)); |
| result.append(")"); |
| if (exceptionTypes != null && exceptionTypes.length != 0) { |
| result.append(" throws "); |
| result.append(toString(exceptionTypes)); |
| } |
| |
| return result.toString(); |
| } |
| } |