io.virtdata.core.BindingsCache Maven / Gradle / Ivy

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With inspiration from other libraries

There is a newer version: 2.12.15

/*
*   Copyright 2017 jshook
*   Licensed under the Apache License, Version 2.0 (the "License");
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*   limitations under the License.
*/
package io.virtdata.core;

import java.util.HashMap;
import java.util.Map;

public class BindingsCache {

    private final Bindings bindings;
    private Map valuesCache = new HashMap<>();

    public BindingsCache(Bindings bindings) {
        this.bindings = bindings;
    }

    public Object getField(String fieldName, long input) {
        Object value = valuesCache.computeIfAbsent(fieldName, k -> getFieldValue(fieldName, input));
        return value;
    }

    private Object getFieldValue(String fieldName, long coordinate) {
        int i = bindings.getTemplate().getBindPointNames().indexOf(fieldName);
        if (i<0) {
            throw new RuntimeException("field name '" + fieldName + "' does not exist in bindings:" + bindings);
        }
        Object o = bindings.get(i, coordinate);
        return o;
    }

    public Map getCachedMap() {
        return this.valuesCache;
    }
}