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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.slime;
/**
* @author havardpe
*/
final class ArrayValue extends Value {
static final int initial_capacity = 16;
static final Impl initial_impl = new EmptyImpl();
private interface Impl {
public void prepareFor(ArrayValue self, Type type);
public Value add(Value value, int used);
public Value get(int index);
}
private static final class EmptyImpl implements Impl {
public void prepareFor(ArrayValue self, Type type) {
if (type == Type.LONG) {
self.impl = new LongImpl();
} else if (type == Type.DOUBLE) {
self.impl = new DoubleImpl();
} else {
self.impl = new GenericImpl(this, 0);
}
}
public Value add(Value value, int used) { return NixValue.invalid(); }
public Value get(int index) { return NixValue.invalid(); }
}
private static final class LongImpl implements Impl {
private long[] values = new long[initial_capacity];
public void prepareFor(ArrayValue self, Type type) {
if (type != Type.LONG) {
self.impl = new GenericImpl(this, self.used);
}
}
public Value add(Value value, int used) {
if (used == values.length) {
long[] v = values;
values = new long[v.length << 1];
System.arraycopy(v, 0, values, 0, used);
}
values[used] = value.asLong();
return get(used);
}
public Value get(int index) { return new LongValue(values[index]); }
}
private static final class DoubleImpl implements Impl {
private double[] values = new double[initial_capacity];
public void prepareFor(ArrayValue self, Type type) {
if (type != Type.DOUBLE) {
self.impl = new GenericImpl(this, self.used);
}
}
public Value add(Value value, int used) {
if (used == values.length) {
double[] v = values;
values = new double[v.length << 1];
System.arraycopy(v, 0, values, 0, used);
}
values[used] = value.asDouble();
return get(used);
}
public Value get(int index) { return new DoubleValue(values[index]); }
}
private static final class GenericImpl implements Impl {
private Value[] values;
GenericImpl(Impl src, int len) {
int capacity = initial_capacity;
while (capacity < (len + 1)) {
capacity = capacity << 1;
}
values = new Value[capacity];
for (int i = 0; i < len; i++) {
values[i] = src.get(i);
}
}
public void prepareFor(ArrayValue self, Type type) {}
public Value add(Value value, int used) {
if (used == values.length) {
Value[] v = values;
values = new Value[v.length << 1];
System.arraycopy(v, 0, values, 0, used);
}
values[used] = value;
return get(used);
}
public Value get(int index) { return values[index]; }
}
private Impl impl = initial_impl;
private int used = 0;
private final SymbolTable names;
public ArrayValue(SymbolTable names) { this.names = names; }
public Type type() { return Type.ARRAY; }
public int children() { return used; }
public int entries() { return used; }
public Value entry(int index) {
return (index >= 0 && index < used) ? impl.get(index) : NixValue.invalid();
}
public void accept(Visitor v) { v.visitArray(this); }
public void traverse(ArrayTraverser at) {
for (int i = 0; i < used; i++) {
at.entry(i, impl.get(i));
}
}
protected Value addLeaf(Value value) {
impl.prepareFor(this, value.type());
return impl.add(value, used++);
}
public Value addArray() { return addLeaf(new ArrayValue(names)); }
public Value addObject() { return addLeaf(new ObjectValue(names)); }
}
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