org.sfm.tuples.GenerateTuples Maven / Gradle / Ivy
package org.sfm.tuples;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
public class GenerateTuples {
public static void generateTuple(Writer writer, int from, int size, boolean upward) throws IOException {
writer.append("package org.sfm.tuples;\n\n");
writer.append("public class Tuple").append(Integer.toString(size)).append("<");
for(int i = 0; i < size; i++) {
if (i != 0) writer.append(", ");
writer.append("T").append(Integer.toString(i+1));
}
writer.append(">");
if (from > 0) {
writer.append(" extends Tuple").append(Integer.toString(from)).append("<");
for(int i = 0; i < from; i++) {
if (i != 0) writer.append(", ");
writer.append("T").append(Integer.toString(i+1));
}
writer.append(">");
}
writer.append(" {\n");
// variable
writer.append("\n");
for(int i = from; i < size; i++) {
writer.append(" private final T").append(Integer.toString(i+1)).append(" element").append(Integer.toString(i)).append(";\n");
}
writer.append("\n");
// constructor
writer.append(" public Tuple").append(Integer.toString(size)).append("(");
for(int i = 0; i < size; i++) {
if (i != 0) writer.append(", ");
writer.append("T").append(Integer.toString(i + 1)).append(" element").append(Integer.toString(i));
}
writer.append(") {\n");
if (from >0) {
writer.append(" super(");
for(int i = 0; i < from; i++) {
if (i != 0) writer.append(", ");
writer.append("element").append(Integer.toString(i));
}
writer.append(");\n");
}
for(int i = from; i < size; i++) {
writer.append(" this.element").append(Integer.toString(i)).append(" = element").append(Integer.toString(i)).append(";\n");
}
writer.append(" }\n\n");
// accessor
for(int i = from; i < size; i++) {
writer.append(" public final T").append(Integer.toString(i + 1)).append(" getElement").append(Integer.toString(i)).append("() {\n");
writer.append(" return element").append(Integer.toString(i)).append(";\n");
writer.append(" }\n\n");
String thName = getThName(i);
if (thName != null) {
writer.append(" public final T").append(Integer.toString(i + 1)).append(" ").append(thName).append("() {\n");
writer.append(" return getElement").append(Integer.toString(i)).append("();\n");
writer.append(" }\n\n");
}
}
// equals
writer
.append(" @Override\n")
.append(" public boolean equals(Object o) {\n")
.append(" if (this == o) return true;\n")
.append(" if (o == null || getClass() != o.getClass()) return false;\n");
if (from > 0) {
writer.append(" if (!super.equals(o)) return false;\n");
}
writer.append("\n");
writer
.append(" Tuple").append(Integer.toString(size)).append(" tuple").append(Integer.toString(size))
.append(" = (Tuple").append(Integer.toString(size)).append(") o;\n");
writer.append("\n");
for(int i = from; i < size; i++) {
writer
.append(" if (element")
.append(Integer.toString(i))
.append(" != null ? !element")
.append(Integer.toString(i))
.append(".equals(tuple")
.append(Integer.toString(size))
.append(".element")
.append(Integer.toString(i))
.append(") : tuple")
.append(Integer.toString(size))
.append(".element")
.append(Integer.toString(i))
.append(" != null) return false;\n");
}
writer
.append("\n return true;\n }\n\n");
// hashcode
writer
.append(" @Override\n")
.append(" public int hashCode() {\n");
if (from > 0) {
writer.append(" int result = super.hashCode();\n");
}
for(int i = from; i < size; i++) {
writer.append(" ");
if (i == 0) {
writer.append("int ");
}
writer.append("result = ");
if (i == 0) {
writer.append("element0 != null ? element0.hashCode() : 0;\n");
} else {
writer.append("31 * result + (element").append(Integer.toString(i)).append(" != null ? element").append(Integer.toString(i)).append(".hashCode() : 0);\n");
}
}
writer
.append(" return result;\n")
.append(" }\n\n");
// to string
writer
.append(" @Override\n")
.append(" public String toString() {\n");
writer
.append(" return \"Tuple").append(Integer.toString(size)).append("{\" +\n");
for(int i = 0; i < size; i++) {
writer
.append(" \"");
if (i > 0) {
writer.append(", ");
}
writer
.append("element")
.append(Integer.toString(i))
.append("=\" + getElement")
.append(Integer.toString(i))
.append("() +\n");
}
writer
.append(" '}';\n");
writer.append(" }\n");
if (upward) {
writer.append("\n");
writer.append(" public Tuple").append(Integer.toString(size + 1)).append("<");
for (int i = 0; i <= size; i++) {
if (i != 0) writer.append(", ");
writer.append("T").append(Integer.toString(i + 1));
}
writer.append("> tuple").append(Integer.toString(size + 1)).append("(T").append(Integer.toString(size + 1)).append(" element").append(Integer.toString(size)).append(") {\n");
writer.append(" return new Tuple").append(Integer.toString(size + 1)).append("<");
for (int i = 0; i <= size; i++) {
if (i != 0) writer.append(", ");
writer.append("T").append(Integer.toString(i + 1));
}
writer.append(">(");
for (int i = 0; i < size; i++) {
if (i != 0) writer.append(", ");
writer.append("getElement").append(Integer.toString(i)).append("()");
}
writer.append(", element").append(Integer.toString(size));
writer.append(");\n");
writer.append(" }\n");
}
writer.append("}\n");
}
private static String getThName(int i) {
switch (i) {
case 0: return "first";
case 1: return "second";
case 2: return "third";
case 3: return "forth";
case 4: return "fifth";
case 5: return "sixth";
case 6: return "seventh";
case 7: return "eighth";
case 8: return "ninth";
case 9: return "tenth";
}
return null;
}
public static void main(String[] args) throws IOException {
for(int i = 2; i <= 32; i++) {
write(i);
}
}
private static void write(int i) throws IOException {
FileWriter writer = new FileWriter("src/main/java/org/sfm/tuples/Tuple" + i + ".java");
try {
generateTuple(writer, i == 2 ? 0 : i - 1, i , i != 32);
} finally {
writer.close();
}
}
}