com.opengamma.strata.report.framework.format.CurrencyParameterSensitivityValueFormatter.java Source code

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Here is the source code for com.opengamma.strata.report.framework.format.CurrencyParameterSensitivityValueFormatter.java

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/**
 * Copyright (C) 2015 - present by OpenGamma Inc. and the OpenGamma group of companies
 * 
 * Please see distribution for license.
 */
package com.opengamma.strata.report.framework.format;

import java.util.List;
import java.util.Objects;
import java.util.function.DoubleFunction;
import java.util.function.IntFunction;

import com.google.common.base.Strings;
import com.opengamma.strata.market.param.CurrencyParameterSensitivity;
import com.opengamma.strata.market.param.ParameterMetadata;

/**
 * Formatter for currency parameter sensitivity.
 */
class CurrencyParameterSensitivityValueFormatter implements ValueFormatter<CurrencyParameterSensitivity> {

    /**
     * The single shared instance of this formatter.
     */
    static final CurrencyParameterSensitivityValueFormatter INSTANCE = new CurrencyParameterSensitivityValueFormatter();

    private static final int PADDED_FIELD_WIDTH = 15;

    private final DoubleValueFormatter doubleFormatter = DoubleValueFormatter.INSTANCE;

    // restricted constructor
    private CurrencyParameterSensitivityValueFormatter() {
    }

    //-------------------------------------------------------------------------
    @Override
    public String formatForCsv(CurrencyParameterSensitivity sensitivity) {
        return getSensitivityString(sensitivity, doubleFormatter::formatForCsv, false);
    }

    @Override
    public String formatForDisplay(CurrencyParameterSensitivity sensitivity) {
        return getSensitivityString(sensitivity, doubleFormatter::formatForDisplay, true);
    }

    private String getSensitivityString(CurrencyParameterSensitivity sensitivity, DoubleFunction<String> formatFn,
            boolean pad) {

        StringBuilder sb = new StringBuilder();
        List<ParameterMetadata> parameterMetadata = sensitivity.getParameterMetadata();
        IntFunction<String> labelProvider = i -> Objects
                .toString(Strings.emptyToNull(parameterMetadata.get(i).getLabel()), String.valueOf(i + 1));

        for (int i = 0; i < sensitivity.getSensitivity().size(); i++) {
            String formattedSensitivity = formatFn.apply(sensitivity.getSensitivity().get(i));
            String field = labelProvider.apply(i) + " = " + formattedSensitivity;
            if (pad) {
                field = Strings.padEnd(field, PADDED_FIELD_WIDTH, ' ');
            }
            sb.append(field);
            if (i < sensitivity.getSensitivity().size() - 1) {
                sb.append(" | ");
            }
        }
        return sb.toString();
    }

}