Android Open Source - NexusData Field Path Expression

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCT...

Java Source Code

package com.github.dkharrat.nexusdata.predicate;
//from w  w  w . j a va  2 s.  c om
import java.lang.reflect.Field;

import com.github.dkharrat.nexusdata.core.ManagedObject;

public class FieldPathExpression implements Expression<Object> {

    private final String fieldPath;

    public FieldPathExpression(String fieldPath) {
        this.fieldPath = fieldPath;
    }

    public String getFieldPath() {
        return fieldPath;
    }

    @Override
    public <T> T accept(ExpressionVisitor<T> visitor) {
        return visitor.visit(this);
    }

    @Override
    public Object evaluate(Object object) {
        try {
            if (object instanceof ManagedObject) {
                return ((ManagedObject)object).getValue(fieldPath);
            } else {
                Field field = object.getClass().getDeclaredField(fieldPath);
                field.setAccessible(true);
                return field.get(object);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String toString() {
        return fieldPath;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        FieldPathExpression that = (FieldPathExpression) o;

        if (!fieldPath.equals(that.fieldPath)) return false;

        return true;
    }

    @Override
    public int hashCode() {
        return fieldPath.hashCode();
    }
}

Java Source Code List

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