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authorpatriot1burke <patriot1burke@30ef5769-5b8d-40dd-aea6-55b5d6557bb3>2003-04-22 13:47:06 +0000
committerpatriot1burke <patriot1burke@30ef5769-5b8d-40dd-aea6-55b5d6557bb3>2003-04-22 13:47:06 +0000
commit069bceaf72fd0d6ffad14ce4e3e00ca91a280bde (patch)
treeb8230a15d3061c64d5a64bf9efa654d0d6311ff2 /src/main/javassist/CtNewMethod.java
parentf610083ba0adbcb3fe92a504015fb26fb5a42530 (diff)
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+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License. You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba. Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist;
+
+import javassist.bytecode.*;
+import javassist.compiler.Javac;
+import javassist.compiler.CompileError;
+import javassist.CtMethod.ConstParameter;
+
+/**
+ * A collection of static methods for creating a <code>CtMethod</code>.
+ * An instance of this class does not make any sense.
+ *
+ * @see CtClass#addMethod(CtMethod)
+ */
+public class CtNewMethod {
+
+ /**
+ * Compiles the given source code and creates a method.
+ * The source code must include not only the method body
+ * but the whole declaration, for example,
+ *
+ * <ul><pre>"public Object id(Object obj) { return obj; }"</pre></ul>
+ *
+ * @param src the source text.
+ * @param declaring the class to which the created method is added.
+ */
+ public static CtMethod make(String src, CtClass declaring)
+ throws CannotCompileException
+ {
+ return make(src, declaring, null, null);
+ }
+
+ /**
+ * Compiles the given source code and creates a method.
+ * The source code must include not only the method body
+ * but the whole declaration, for example,
+ *
+ * <ul><pre>"public Object id(Object obj) { return obj; }"</pre></ul>
+ *
+ * <p>If the source code includes <code>$proceed()</code>, then
+ * it is compiled into a method call on the specified object.
+ *
+ * @param src the source text.
+ * @param declaring the class to which the created method is added.
+ * @param delegateObj the source text specifying the object
+ * that is called on by <code>$proceed()</code>.
+ * @param delegateMethod the name of the method
+ * that is called by <code>$proceed()</code>.
+ */
+ public static CtMethod make(String src, CtClass declaring,
+ String delegateObj, String delegateMethod)
+ throws CannotCompileException
+ {
+ Javac compiler = new Javac(declaring);
+ try {
+ if (delegateMethod != null)
+ compiler.recordProceed(delegateObj, delegateMethod);
+
+ CtMember obj = compiler.compile(src);
+ if (obj instanceof CtMethod)
+ return (CtMethod)obj;
+ }
+ catch (CompileError e) {
+ throw new CannotCompileException(e);
+ }
+
+ throw new CannotCompileException("not a method");
+ }
+
+ /**
+ * Creates a public method.
+ *
+ * @param returnType the type of the returned value
+ * @param mname the method name
+ * @param parameters a list of the parameter types
+ * @param exceptions a list of the exception types
+ * @param src the source text of the method body.
+ * It must be a block surrounded by <code>{}</code>.
+ * @param declaring the class to which the created method is added.
+ */
+ public static CtMethod make(CtClass returnType, String mname,
+ CtClass[] parameters, CtClass[] exceptions,
+ String body, CtClass declaring)
+ throws CannotCompileException
+ {
+ try {
+ CtMethod cm
+ = new CtMethod(returnType, mname, parameters, declaring);
+ cm.setExceptionTypes(exceptions);
+ cm.setBody(body);
+ return cm;
+ }
+ catch (NotFoundException e) {
+ throw new CannotCompileException(e);
+ }
+ }
+
+ /**
+ * Creates a copy of a method. This method is provided for creating
+ * a new method based on an existing method.
+ *
+ * @param src the source method.
+ * @param declaring the class to which the created method is added.
+ * @param map the hashtable associating original class names
+ * with substituted names.
+ * It can be <code>null</code>.
+ *
+ * @see CtMethod#CtMethod(CtMethod,CtClass,ClassMap)
+ */
+ public static CtMethod copy(CtMethod src, CtClass declaring,
+ ClassMap map) throws CannotCompileException {
+ return new CtMethod(src, declaring, map);
+ }
+
+ /**
+ * Creates a copy of a method with a new name.
+ * This method is provided for creating
+ * a new method based on an existing method.
+ *
+ * @param src the source method.
+ * @param name the name of the created method.
+ * @param declaring the class to which the created method is added.
+ * @param map the hashtable associating original class names
+ * with substituted names.
+ * It can be <code>null</code>.
+ *
+ * @see CtMethod#CtMethod(CtMethod,CtClass,ClassMap)
+ */
+ public static CtMethod copy(CtMethod src, String name, CtClass declaring,
+ ClassMap map) throws CannotCompileException {
+ CtMethod cm = new CtMethod(src, declaring, map);
+ cm.setName(name);
+ return cm;
+ }
+
+ /**
+ * Creates a public abstract method.
+ *
+ * @param returnType the type of the returned value
+ * @param mname the method name
+ * @param parameters a list of the parameter types
+ * @param exceptions a list of the exception types
+ * @param declaring the class to which the created method is added.
+ *
+ * @see CtMethod#CtMethod(CtClass,String,CtClass[],CtClass)
+ */
+ public static CtMethod abstractMethod(CtClass returnType,
+ String mname,
+ CtClass[] parameters,
+ CtClass[] exceptions,
+ CtClass declaring)
+ throws NotFoundException
+ {
+ CtMethod cm = new CtMethod(returnType, mname, parameters, declaring);
+ cm.setExceptionTypes(exceptions);
+ return cm;
+ }
+
+ /**
+ * Creates a public getter method. The getter method returns the value
+ * of the specified field in the class to which this method is added.
+ * The created method is initially not static even if the field is
+ * static. Change the modifiers if the method should be static.
+ *
+ * @param methodName the name of the getter
+ * @param field the field accessed.
+ */
+ public static CtMethod getter(String methodName, CtField field)
+ throws CannotCompileException
+ {
+ FieldInfo finfo = field.getFieldInfo2();
+ String fieldType = finfo.getDescriptor();
+ String desc = "()" + fieldType;
+ ConstPool cp = finfo.getConstPool();
+ MethodInfo minfo = new MethodInfo(cp, methodName, desc);
+ minfo.setAccessFlags(AccessFlag.PUBLIC);
+
+ Bytecode code = new Bytecode(cp, 2, 1);
+ try {
+ String fieldName = finfo.getName();
+ if ((finfo.getAccessFlags() & AccessFlag.STATIC) == 0) {
+ code.addAload(0);
+ code.addGetfield(Bytecode.THIS, fieldName, fieldType);
+ }
+ else
+ code.addGetstatic(Bytecode.THIS, fieldName, fieldType);
+
+ code.addReturn(field.getType());
+ }
+ catch (NotFoundException e) {
+ throw new CannotCompileException(e);
+ }
+
+ minfo.setCodeAttribute(code.toCodeAttribute());
+ return new CtMethod(minfo, field.getDeclaringClass());
+ }
+
+ /**
+ * Creates a public setter method. The setter method assigns the
+ * value of the first parameter to the specified field
+ * in the class to which this method is added.
+ * The created method is initially not static even if the field is
+ * static. Change the modifiers if the method should be static.
+ *
+ * @param methodName the name of the setter
+ * @param field the field accessed.
+ */
+ public static CtMethod setter(String methodName, CtField field)
+ throws CannotCompileException
+ {
+ FieldInfo finfo = field.getFieldInfo2();
+ String fieldType = finfo.getDescriptor();
+ String desc = "(" + fieldType + ")V";
+ ConstPool cp = finfo.getConstPool();
+ MethodInfo minfo = new MethodInfo(cp, methodName, desc);
+ minfo.setAccessFlags(AccessFlag.PUBLIC);
+
+ Bytecode code = new Bytecode(cp, 3, 3);
+ try {
+ String fieldName = finfo.getName();
+ if ((finfo.getAccessFlags() & AccessFlag.STATIC) == 0) {
+ code.addAload(0);
+ code.addLoad(1, field.getType());
+ code.addPutfield(Bytecode.THIS, fieldName, fieldType);
+ }
+ else {
+ code.addLoad(0, field.getType());
+ code.addPutstatic(Bytecode.THIS, fieldName, fieldType);
+ }
+
+ code.addReturn(null);
+ }
+ catch (NotFoundException e) {
+ throw new CannotCompileException(e);
+ }
+
+ minfo.setCodeAttribute(code.toCodeAttribute());
+ return new CtMethod(minfo, field.getDeclaringClass());
+ }
+
+ /**
+ * Creates a method forwarding to a delegate in
+ * a super class. The created method calls a method specified
+ * by <code>delegate</code> with all the parameters passed to the
+ * created method. If the delegate method returns a value,
+ * the created method returns that value to the caller.
+ * The delegate method must be declared in a super class.
+ *
+ * <p>The following method is an example of the created method.
+ *
+ * <ul><pre>int f(int p, int q) {
+ * return super.f(p, q);
+ * }</pre></ul>
+ *
+ * <p>The name of the created method can be changed by
+ * <code>setName()</code>.
+ *
+ * @param delegate the method that the created method forwards to.
+ * @param declaring the class to which the created method is
+ * added.
+ */
+ public static CtMethod delegator(CtMethod delegate, CtClass declaring)
+ throws CannotCompileException
+ {
+ try {
+ return delegator0(delegate, declaring);
+ }
+ catch (NotFoundException e) {
+ throw new CannotCompileException(e);
+ }
+ }
+
+ private static CtMethod delegator0(CtMethod delegate, CtClass declaring)
+ throws CannotCompileException, NotFoundException
+ {
+ MethodInfo deleInfo = delegate.getMethodInfo2();
+ String methodName = deleInfo.getName();
+ String desc = deleInfo.getDescriptor();
+ ConstPool cp = declaring.getClassFile2().getConstPool();
+ MethodInfo minfo = new MethodInfo(cp, methodName, desc);
+ minfo.setAccessFlags(deleInfo.getAccessFlags());
+
+ ExceptionsAttribute eattr = deleInfo.getExceptionsAttribute();
+ if (eattr != null)
+ minfo.setExceptionsAttribute(
+ (ExceptionsAttribute)eattr.copy(cp, null));
+
+ Bytecode code = new Bytecode(cp, 0, 0);
+ boolean isStatic = Modifier.isStatic(delegate.getModifiers());
+ CtClass deleClass = delegate.getDeclaringClass();
+ CtClass[] params = delegate.getParameterTypes();
+ int s;
+ if (isStatic) {
+ s = code.addLoadParameters(params);
+ code.addInvokestatic(deleClass, methodName, desc);
+ }
+ else {
+ code.addLoad(0, deleClass);
+ s = code.addLoadParameters(params);
+ code.addInvokespecial(deleClass, methodName, desc);
+ }
+
+ code.addReturn(delegate.getReturnType());
+ code.setMaxLocals(++s);
+ code.setMaxStack(s < 2 ? 2 : s); // for a 2-word return value
+ minfo.setCodeAttribute(code.toCodeAttribute());
+ return new CtMethod(minfo, declaring);
+ }
+
+ /**
+ * Creates a wrapped method. The wrapped method receives parameters
+ * in the form of an array of <code>Object</code>.
+ *
+ * <p>The body of the created method is a copy of the body of a method
+ * specified by <code>body</code>. However, it is wrapped in
+ * parameter-conversion code.
+ *
+ * <p>The method specified by <code>body</code> must have this singature:
+ *
+ * <ul><code>Object method(Object[] params, &lt;type&gt; cvalue)
+ * </code></ul>
+ *
+ * <p>The type of the <code>cvalue</code> depends on
+ * <code>constParam</code>.
+ * If <code>constParam</code> is <code>null</code>, the signature
+ * must be:
+ *
+ * <ul><code>Object method(Object[] params)</code></ul>
+ *
+ * <p>The method body copied from <code>body</code> is wrapped in
+ * parameter-conversion code, which converts parameters specified by
+ * <code>parameterTypes</code> into an array of <code>Object</code>.
+ * The returned value is also converted from the <code>Object</code>
+ * type to the type specified by <code>returnType</code>. Thus,
+ * the resulting method body is as follows:
+ *
+ * <ul><pre>Object[] params = new Object[] { p0, p1, ... };
+ * &lt;<i>type</i>&gt; cvalue = &lt;<i>constant-value</i>&gt;;
+ * <i>... copied method body ...</i>
+ * Object result = &lt;<i>returned value</i>&gt;
+ * return (<i>&lt;returnType&gt;</i>)result;
+ * </pre></ul>
+ *
+ * <p>The variables <code>p0</code>, <code>p2</code>, ... represent
+ * formal parameters of the created method.
+ * The value of <code>cvalue</code> is specified by
+ * <code>constParam</code>.
+ *
+ * <p>If the type of a parameter or a returned value is a primitive
+ * type, then the value is converted into a wrapper object such as
+ * <code>java.lang.Integer</code>. If the type of the returned value
+ * is <code>void</code>, the returned value is discarded.
+ *
+ * <p><i>Example:</i>
+ *
+ * <ul><pre>ClassPool pool = ... ;
+ * CtClass vec = pool.makeClass("intVector");
+ * vec.setSuperclass(pool.get("java.util.Vector"));
+ * CtMethod addMethod = pool.getMethod("Sample", "add0");
+ *
+ * CtClass[] argTypes = { CtClass.intType };
+ * CtMethod m = CtNewMethod.wrapped(CtClass.voidType, "add", argTypes,
+ * null, addMethod, null, vec);
+ * vec.addMethod(m);</pre></ul>
+ *
+ * <p>where the class <code>Sample</code> is as follows:
+ *
+ * <ul><pre>public class Sample extends java.util.Vector {
+ * public Object add0(Object[] args) {
+ * super.addElement(args[0]);
+ * return null;
+ * }
+ * }</pre></ul>
+ *
+ * <p>This program produces a class <code>intVector</code>:
+ *
+ * <ul><pre>public class intVector extends java.util.Vector {
+ * public void add(int p0) {
+ * Object[] args = new Object[] { p0 };
+ * // begin of copied body
+ * super.addElement(args[0]);
+ * Object result = null;
+ * // end
+ * }
+ * }</pre></ul>
+ *
+ * <p>Note that the type of the parameter to <code>add()</code> depends
+ * only on the value of <code>argTypes</code> passed to
+ * <code>CtNewMethod.wrapped()</code>. Thus, it is easy to
+ * modify this program to produce a
+ * <code>StringVector</code> class, which is a vector containing
+ * only <code>String</code> objects, and other vector classes.
+ *
+ * @param returnType the type of the returned value.
+ * @param mname the method name.
+ * @param parameters a list of the parameter types.
+ * @param exceptions a list of the exception types.
+ * @param body the method body
+ * @param constParam the constant parameter
+ * (maybe <code>null</code>).
+ * @param declaring the class to which the created method is
+ * added.
+ */
+ public static CtMethod wrapped(CtClass returnType,
+ String mname,
+ CtClass[] parameterTypes,
+ CtClass[] exceptionTypes,
+ CtMethod body, ConstParameter constParam,
+ CtClass declaring)
+ throws CannotCompileException
+ {
+ return CtNewWrappedMethod.wrapped(returnType, mname, parameterTypes,
+ exceptionTypes, body, constParam, declaring);
+ }
+}