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Parameter Source

There is a newer version: 1.0

package com.laamella.parameter_source;

import java.util.Optional;
import java.util.function.BiFunction;

import static java.util.Objects.requireNonNull;

/**
 * Supports the "subSource" method.
 */
public class SubParameterSource implements ParameterSource {
    private final ParameterSource delegate;
    private final String keyPart;
    private final BiFunction keyCombiner;

    public SubParameterSource(ParameterSource delegate, String keyPart, BiFunction keyCombiner) {
        requireNonNull(delegate);
        requireNonNull(keyPart);
        requireNonNull(keyCombiner);

        this.delegate = delegate;
        this.keyPart = keyPart;
        this.keyCombiner = keyCombiner;
    }

    @Override
    public Optional getOptionalString(String key) {
        requireNonNull(key);
        return delegate.getOptionalString(combineKeys(keyPart, key));
    }

    @Override
    public Optional getOptionalInteger(String key) {
        requireNonNull(key);
        return delegate.getOptionalInteger(combineKeys(keyPart, key));
    }

    @Override
    public Optional