/*
* Copyright (c) 2009-2012 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of 'jMonkeyEngine' 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 com.jme3.scene.plugins.blender.file;
import com.jme3.scene.plugins.blender.BlenderContext;
import java.util.HashMap;
import java.util.Map;
/**
* The data block containing the description of the file.
* @author Marcin Roguski (Kaelthas)
*/
public class DnaBlockData {
private static final int SDNA_ID = 'S' << 24 | 'D' << 16 | 'N' << 8 | 'A'; // SDNA
private static final int NAME_ID = 'N' << 24 | 'A' << 16 | 'M' << 8 | 'E'; // NAME
private static final int TYPE_ID = 'T' << 24 | 'Y' << 16 | 'P' << 8 | 'E'; // TYPE
private static final int TLEN_ID = 'T' << 24 | 'L' << 16 | 'E' << 8 | 'N'; // TLEN
private static final int STRC_ID = 'S' << 24 | 'T' << 16 | 'R' << 8 | 'C'; // STRC
/** Structures available inside the file. */
private final Structure[] structures;
/** A map that helps finding a structure by type. */
private final Map<String, Structure> structuresMap;
/**
* Constructor. Loads the block from the given stream during instance creation.
* @param inputStream
* the stream we read the block from
* @param blenderContext
* the blender context
* @throws BlenderFileException
* this exception is throw if the blend file is invalid or somehow corrupted
*/
public DnaBlockData(BlenderInputStream inputStream, BlenderContext blenderContext) throws BlenderFileException {
int identifier;
// reading 'SDNA' identifier
identifier = inputStream.readByte() << 24 | inputStream.readByte() << 16 | inputStream.readByte() << 8 | inputStream.readByte();
if (identifier != SDNA_ID) {
throw new BlenderFileException("Invalid identifier! '" + this.toString(SDNA_ID) + "' expected and found: " + this.toString(identifier));
}
// reading names
identifier = inputStream.readByte() << 24 | inputStream.readByte() << 16 | inputStream.readByte() << 8 | inputStream.readByte();
if (identifier != NAME_ID) {
throw new BlenderFileException("Invalid identifier! '" + this.toString(NAME_ID) + "' expected and found: " + this.toString(identifier));
}
int amount = inputStream.readInt();
if (amount <= 0) {
throw new BlenderFileException("The names amount number should be positive!");
}
String[] names = new String[amount];
for (int i = 0; i < amount; ++i) {
names[i] = inputStream.readString();
}
// reding types
inputStream.alignPosition(4);
identifier = inputStream.readByte() << 24 | inputStream.readByte() << 16 | inputStream.readByte() << 8 | inputStream.readByte();
if (identifier != TYPE_ID) {
throw new BlenderFileException("Invalid identifier! '" + this.toString(TYPE_ID) + "' expected and found: " + this.toString(identifier));
}
amount = inputStream.readInt();
if (amount <= 0) {
throw new BlenderFileException("The types amount number should be positive!");
}
String[] types = new String[amount];
for (int i = 0; i < amount; ++i) {
types[i] = inputStream.readString();
}
// reading lengths
inputStream.alignPosition(4);
identifier = inputStream.readByte() << 24 | inputStream.readByte() << 16 | inputStream.readByte() << 8 | inputStream.readByte();
if (identifier != TLEN_ID) {
throw new BlenderFileException("Invalid identifier! '" + this.toString(TLEN_ID) + "' expected and found: " + this.toString(identifier));
}
int[] lengths = new int[amount];// theamount is the same as int types
for (int i = 0; i < amount; ++i) {
lengths[i] = inputStream.readShort();
}
// reading structures
inputStream.alignPosition(4);
identifier = inputStream.readByte() << 24 | inputStream.readByte() << 16 | inputStream.readByte() << 8 | inputStream.readByte();
if (identifier != STRC_ID) {
throw new BlenderFileException("Invalid identifier! '" + this.toString(STRC_ID) + "' expected and found: " + this.toString(identifier));
}
amount = inputStream.readInt();
if (amount <= 0) {
throw new BlenderFileException("The structures amount number should be positive!");
}
structures = new Structure[amount];
structuresMap = new HashMap<String, Structure>(amount);
for (int i = 0; i < amount; ++i) {
structures[i] = new Structure(inputStream, names, types, blenderContext);
if (structuresMap.containsKey(structures[i].getType())) {
throw new BlenderFileException("Blend file seems to be corrupted! The type " + structures[i].getType() + " is defined twice!");
}
structuresMap.put(structures[i].getType(), structures[i]);
}
}
/**
* This method returns the amount of the structures.
* @return the amount of the structures
*/
public int getStructuresCount() {
return structures.length;
}
/**
* This method returns the structure of the given index.
* @param index
* the index of the structure
* @return the structure of the given index
*/
public Structure getStructure(int index) {
try {
return (Structure) structures[index].clone();
} catch (CloneNotSupportedException e) {
throw new IllegalStateException("Structure should be clonable!!!", e);
}
}
/**
* This method returns a structure of the given name. If the name does not exists then null is returned.
* @param name
* the name of the structure
* @return the required structure or null if the given name is inapropriate
*/
public Structure getStructure(String name) {
try {
return (Structure) structuresMap.get(name).clone();
} catch (CloneNotSupportedException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
/**
* This method indicates if the structure of the given name exists.
* @param name
* the name of the structure
* @return true if the structure exists and false otherwise
*/
public boolean hasStructure(String name) {
return structuresMap.containsKey(name);
}
/**
* This method converts the given identifier code to string.
* @param code
* the code taht is to be converted
* @return the string value of the identifier
*/
private String toString(int code) {
char c1 = (char) ((code & 0xFF000000) >> 24);
char c2 = (char) ((code & 0xFF0000) >> 16);
char c3 = (char) ((code & 0xFF00) >> 8);
char c4 = (char) (code & 0xFF);
return String.valueOf(c1) + c2 + c3 + c4;
}
@Override
public String toString() {
StringBuilder stringBuilder = new StringBuilder("=============== ").append(SDNA_ID).append('\n');
for (Structure structure : structures) {
stringBuilder.append(structure.toString()).append('\n');
}
return stringBuilder.append("===============").toString();
}
}