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package net.fornwall.jelf;

import java.io.IOException;

public class ElfSymbolStructure implements SymbolLocator {

    private final ElfParser parser;
    private final long offset;
    private final int entrySize;
    private final MemoizedObject stringTable;
    private final MemoizedObject hashTable;

    ElfSymbolStructure(final ElfParser parser, long offset, int entrySize, MemoizedObject stringTable, MemoizedObject hashTable) {
        this.parser = parser;
        this.offset = offset;
        this.entrySize = entrySize;
        this.stringTable = stringTable;
        this.hashTable = hashTable;
    }

    /** Returns the symbol at the specified index. The ELF symbol at index 0 is the undefined symbol. */
    @Override
    public ElfSymbol getELFSymbol(int index) throws IOException {
        return new ElfSymbol(parser, offset + index * entrySize, -1).setStringTable(stringTable.getValue());
    }

    @Override
    public ElfSymbol getELFSymbolByAddr(long addr) throws IOException {
        if (hashTable == null) {
            throw new UnsupportedOperationException("hashTable is null");
        }
        HashTable hashTable = this.hashTable.getValue();
        for (int i = 0; i < hashTable.getNumBuckets(); i++) {
            ElfSymbol symbol = getELFSymbol(i);
            if (addr >= symbol.value && addr < symbol.value + symbol.size) {
                return symbol;
            }
        }
        return null;
    }

    @Override
    public ElfSymbol getELFSymbolByName(String name) throws IOException {
        if (hashTable == null) {
            return null;
        }
        return hashTable.getValue().getSymbol(this, name);
    }

}