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Java example source code file (IntType.java)

This example Java source code file (IntType.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

booleantype, branchhandle, branchinstruction, constantpoolgen, errormsg, ifeq, instruction, instructionlist, inttype, methodgenerator, numbertype, realtype, referencetype, stringtype

The IntType.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2004 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.
 */
/*
 * $Id: IntType.java,v 1.2.4.1 2005/09/05 11:14:44 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler.util;

import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.BranchInstruction;
import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GOTO;
import com.sun.org.apache.bcel.internal.generic.IFEQ;
import com.sun.org.apache.bcel.internal.generic.IFGE;
import com.sun.org.apache.bcel.internal.generic.IFGT;
import com.sun.org.apache.bcel.internal.generic.IFLE;
import com.sun.org.apache.bcel.internal.generic.IFLT;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPGE;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPGT;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPLE;
import com.sun.org.apache.bcel.internal.generic.IF_ICMPLT;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionConstants;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public final class IntType extends NumberType {
    protected IntType() {}

    public String toString() {
        return "int";
    }

    public boolean identicalTo(Type other) {
        return this == other;
    }

    public String toSignature() {
        return "I";
    }

    public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
        return com.sun.org.apache.bcel.internal.generic.Type.INT;
    }

    /**
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#distanceTo
     */
    public int distanceTo(Type type) {
        if (type == this) {
            return 0;
        }
        else if (type == Type.Real) {
            return 1;
        }
        else
            return Integer.MAX_VALUE;
    }

    /**
     * Translates an integer into an object of internal type <code>type.
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            final Type type) {
        if (type == Type.Real) {
            translateTo(classGen, methodGen, (RealType) type);
        }
        else if (type == Type.String) {
            translateTo(classGen, methodGen, (StringType) type);
        }
        else if (type == Type.Boolean) {
            translateTo(classGen, methodGen, (BooleanType) type);
        }
        else if (type == Type.Reference) {
            translateTo(classGen, methodGen, (ReferenceType) type);
        }
        else {
            ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                        toString(), type.toString());
            classGen.getParser().reportError(Constants.FATAL, err);
        }
    }

    /**
     * Expects an integer on the stack and pushes a real.
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            RealType type) {
        methodGen.getInstructionList().append(I2D);
    }

    /**
     * Expects an integer on the stack and pushes its string value by calling
     * <code>Integer.toString(int i).
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            StringType type) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        il.append(new INVOKESTATIC(cpg.addMethodref(INTEGER_CLASS,
                                                    "toString",
                                                    "(I)" + STRING_SIG)));
    }

    /**
     * Expects an integer on the stack and pushes a 0 if its value is 0 and
     * a 1 otherwise.
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            BooleanType type) {
        final InstructionList il = methodGen.getInstructionList();
        final BranchHandle falsec = il.append(new IFEQ(null));
        il.append(ICONST_1);
        final BranchHandle truec = il.append(new GOTO(null));
        falsec.setTarget(il.append(ICONST_0));
        truec.setTarget(il.append(NOP));
    }

    /**
     * Expects an integer on the stack and translates it to a non-synthesized
     * boolean. It does not push a 0 or a 1 but instead returns branchhandle
     * list to be appended to the false list.
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateToDesynthesized
     */
    public FlowList translateToDesynthesized(ClassGenerator classGen,
                                             MethodGenerator methodGen,
                                             BooleanType type) {
        final InstructionList il = methodGen.getInstructionList();
        return new FlowList(il.append(new IFEQ(null)));
    }

    /**
     * Expects an integer on the stack and pushes a boxed integer.
     * Boxed integers are represented by an instance of
     * <code>java.lang.Integer.
     *
     * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            ReferenceType type) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        il.append(new NEW(cpg.addClass(INTEGER_CLASS)));
        il.append(DUP_X1);
        il.append(SWAP);
        il.append(new INVOKESPECIAL(cpg.addMethodref(INTEGER_CLASS,
                                                     "<init>", "(I)V")));
    }

    /**
     * Translates an integer into the Java type denoted by <code>clazz.
     * Expects an integer on the stack and pushes a number of the appropriate
     * type after coercion.
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                            Class clazz) {
        final InstructionList il = methodGen.getInstructionList();
        if (clazz == Character.TYPE) {
            il.append(I2C);
        }
        else if (clazz == Byte.TYPE) {
            il.append(I2B);
        }
        else if (clazz == Short.TYPE) {
            il.append(I2S);
        }
        else if (clazz == Integer.TYPE) {
            il.append(NOP);
        }
        else if (clazz == Long.TYPE) {
            il.append(I2L);
        }
        else if (clazz == Float.TYPE) {
            il.append(I2F);
        }
        else if (clazz == Double.TYPE) {
            il.append(I2D);
        }
         // Is Double <: clazz? I.e. clazz in { Double, Number, Object }
       else if (clazz.isAssignableFrom(java.lang.Double.class)) {
           il.append(I2D);
           Type.Real.translateTo(classGen, methodGen, Type.Reference);
        }
        else {
            ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                        toString(), clazz.getName());
            classGen.getParser().reportError(Constants.FATAL, err);
        }
    }

    /**
     * Translates an object of this type to its boxed representation.
     */
    public void translateBox(ClassGenerator classGen,
                             MethodGenerator methodGen) {
        translateTo(classGen, methodGen, Type.Reference);
    }

    /**
     * Translates an object of this type to its unboxed representation.
     */
    public void translateUnBox(ClassGenerator classGen,
                               MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();
        il.append(new CHECKCAST(cpg.addClass(INTEGER_CLASS)));
        final int index = cpg.addMethodref(INTEGER_CLASS,
                                           INT_VALUE,
                                           INT_VALUE_SIG);
        il.append(new INVOKEVIRTUAL(index));
    }

    public Instruction ADD() {
        return InstructionConstants.IADD;
    }

    public Instruction SUB() {
        return InstructionConstants.ISUB;
    }

    public Instruction MUL() {
        return InstructionConstants.IMUL;
    }

    public Instruction DIV() {
        return InstructionConstants.IDIV;
    }

    public Instruction REM() {
        return InstructionConstants.IREM;
    }

    public Instruction NEG() {
        return InstructionConstants.INEG;
    }

    public Instruction LOAD(int slot) {
        return new ILOAD(slot);
    }

    public Instruction STORE(int slot) {
        return new ISTORE(slot);
    }

    public BranchInstruction GT(boolean tozero) {
        return tozero ? (BranchInstruction) new IFGT(null) :
            (BranchInstruction) new IF_ICMPGT(null);
    }

    public BranchInstruction GE(boolean tozero) {
        return tozero ? (BranchInstruction) new IFGE(null) :
            (BranchInstruction) new IF_ICMPGE(null);
    }

    public BranchInstruction LT(boolean tozero) {
        return tozero ? (BranchInstruction) new IFLT(null) :
            (BranchInstruction) new IF_ICMPLT(null);
    }

    public BranchInstruction LE(boolean tozero) {
        return tozero ? (BranchInstruction) new IFLE(null) :
            (BranchInstruction) new IF_ICMPLE(null);
    }
}

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