/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2007 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.glassfish.pfl.objectweb.asm.util;

import org.glassfish.pfl.objectweb.asm.AnnotationVisitor;
import org.glassfish.pfl.objectweb.asm.Attribute;
import org.glassfish.pfl.objectweb.asm.Type;

import java.util.Map;

/**
 * An abstract ASMifier visitor.
 * 
 * @author Eric Bruneton
 */
public class ASMifierAbstractVisitor extends AbstractVisitor {

    /**
     * The name of the variable for this visitor in the produced code.
     */
    protected String name;

    /**
     * The label names. This map associates String values to Label keys. It is
     * used only in ASMifierMethodVisitor.
     */
    Map labelNames;

    /**
     * Constructs a new {@link ASMifierAbstractVisitor}.
     * 
     * @param name the name of the variable for this visitor in the produced
     *        code.
     */
    protected ASMifierAbstractVisitor(final String name) {
        this.name = name;
    }

    /**
     * Prints the ASM code that generates the given annotation.
     * 
     * @param desc the class descriptor of the annotation class.
     * @param visible <tt>true</tt> if the annotation is visible at runtime.
     * @return a visitor to visit the annotation values.
     */
    public AnnotationVisitor visitAnnotation(
        final String desc,
        final boolean visible)
    {
        buf.setLength(0);
        buf.append("{\n")
                .append("av0 = ")
                .append(name)
                .append(".visitAnnotation(");
        appendConstant(desc);
        buf.append(", ").append(visible).append(");\n");
        text.add(buf.toString());
        ASMifierAnnotationVisitor av = new ASMifierAnnotationVisitor(0);
        text.add(av.getText());
        text.add("}\n");
        return av;
    }

    /**
     * Prints the ASM code that generates the given attribute.
     * 
     * @param attr an attribute.
     */
    public void visitAttribute(final Attribute attr) {
        buf.setLength(0);
        buf.append("// ATTRIBUTE ").append(attr.type).append('\n');
        if (attr instanceof ASMifiable) {
            buf.append("{\n");
            ((ASMifiable) attr).asmify(buf, "attr", labelNames);
            buf.append(name).append(".visitAttribute(attr);\n");
            buf.append("}\n");
        }
        text.add(buf.toString());
    }

    /**
     * Prints the ASM code to end the visit.
     */
    public void visitEnd() {
        buf.setLength(0);
        buf.append(name).append(".visitEnd();\n");
        text.add(buf.toString());
    }

    /**
     * Appends a string representation of the given constant to the given
     * buffer.
     * 
     * @param cst an {@link Integer}, {@link Float}, {@link Long},
     *        {@link Double} or {@link String} object. May be <tt>null</tt>.
     */
    void appendConstant(final Object cst) {
        appendConstant(buf, cst);
    }

    /**
     * Appends a string representation of the given constant to the given
     * buffer.
     * 
     * @param buf a string buffer.
     * @param cst an {@link Integer}, {@link Float}, {@link Long},
     *        {@link Double} or {@link String} object. May be <tt>null</tt>.
     */
    static void appendConstant(final StringBuffer buf, final Object cst) {
        if (cst == null) {
            buf.append("null");
        } else if (cst instanceof String) {
            appendString(buf, (String) cst);
        } else if (cst instanceof Type) {
            buf.append("Type.getType(\"");
            buf.append(((Type) cst).getDescriptor());
            buf.append("\")");
        } else if (cst instanceof Byte) {
            buf.append("new Byte((byte)").append(cst).append(')');
        } else if (cst instanceof Boolean) {
            buf.append(((Boolean) cst).booleanValue() ? "Boolean.TRUE" : "Boolean.FALSE");
        } else if (cst instanceof Short) {
            buf.append("new Short((short)").append(cst).append(')');
        } else if (cst instanceof Character) {
            int c = ((Character) cst).charValue();
            buf.append("new Character((char)").append(c).append(')');
        } else if (cst instanceof Integer) {
            buf.append("new Integer(").append(cst).append(')');
        } else if (cst instanceof Float) {
            buf.append("new Float(\"").append(cst).append("\")");
        } else if (cst instanceof Long) {
            buf.append("new Long(").append(cst).append("L)");
        } else if (cst instanceof Double) {
            buf.append("new Double(\"").append(cst).append("\")");
        } else if (cst instanceof byte[]) {
            byte[] v = (byte[]) cst;
            buf.append("new byte[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof boolean[]) {
            boolean[] v = (boolean[]) cst;
            buf.append("new boolean[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof short[]) {
            short[] v = (short[]) cst;
            buf.append("new short[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append("(short)").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof char[]) {
            char[] v = (char[]) cst;
            buf.append("new char[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",")
                        .append("(char)")
                        .append((int) v[i]);
            }
            buf.append('}');
        } else if (cst instanceof int[]) {
            int[] v = (int[]) cst;
            buf.append("new int[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]);
            }
            buf.append('}');
        } else if (cst instanceof long[]) {
            long[] v = (long[]) cst;
            buf.append("new long[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('L');
            }
            buf.append('}');
        } else if (cst instanceof float[]) {
            float[] v = (float[]) cst;
            buf.append("new float[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('f');
            }
            buf.append('}');
        } else if (cst instanceof double[]) {
            double[] v = (double[]) cst;
            buf.append("new double[] {");
            for (int i = 0; i < v.length; i++) {
                buf.append(i == 0 ? "" : ",").append(v[i]).append('d');
            }
            buf.append('}');
        }
    }
}
