RandomSec/main/src/com/google/refine/expr/ExpressionUtils.java

/*

Copyright 2010, Google Inc.
All rights reserved.

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modification, are permitted provided that the following conditions are
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
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contributors may be used to endorse or promote products derived from
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.expr;

import java.io.Serializable;
import java.time.OffsetDateTime;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Properties;
import java.util.Set;

import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.refine.model.Cell;
import com.google.refine.model.Project;
import com.google.refine.model.Row;

public class ExpressionUtils {
    
    static final protected Set<Binder> s_binders = new HashSet<Binder>();

    static public void registerBinder(Binder binder) {
        s_binders.add(binder);
    }

    static public Properties createBindings(Project project) {
        Properties bindings = new Properties();

        bindings.put("true", true);
        bindings.put("false", false);
        bindings.put("PI", Math.PI);

        bindings.put("project", project);

        for (Binder binder : s_binders) {
            binder.initializeBindings(bindings, project);
        }

        return bindings;
    }

    static public void bind(Properties bindings, Row row, int rowIndex, String columnName, Cell cell) {
        Project project = (Project) bindings.get("project");

        bindings.put("rowIndex", rowIndex);
        bindings.put("row", new WrappedRow(project, rowIndex, row));
        bindings.put("cells", new CellTuple(project, row));

        if (columnName != null) {
            bindings.put("columnName", columnName);
        }

        if (cell == null) {
            bindings.remove("cell");
            bindings.remove("value");
        } else {
            bindings.put("cell", new WrappedCell(project, columnName, cell));
            if (cell.value == null) {
                bindings.remove("value");
            } else {
                bindings.put("value", cell.value);
            }
        }

        for (Binder binder : s_binders) {
            binder.bind(bindings, row, rowIndex, columnName, cell);
        }
    }

    static public boolean isError(Object o) {
        return o instanceof EvalError;
    }
    
    static public boolean isNumber(Object v) {
        return v != null && (v instanceof Number);
    }
    
    static public boolean isBoolean(Object v) {
        return v != null && v instanceof Boolean;
    }
    
    static public boolean isDateTime(Object v) {
        return v != null && v instanceof OffsetDateTime;
    }
    
    static public boolean isNonBlankData(Object o) {
        return
            o != null &&
            !(o instanceof EvalError) &&
            (!(o instanceof String) || ((String) o).length() > 0);
    }

    static public boolean isTrue(Object o) {
        return o != null &&
            (o instanceof Boolean ?
                ((Boolean) o).booleanValue() :
                Boolean.parseBoolean(o.toString()));
    }

    static public boolean sameValue(Object v1, Object v2) {
        if (v1 == null) {
            return (v2 == null) ;
        } else if (v2 == null) {
            return (v1 == null);
        } else {
            return v1.equals(v2);
        }
    }

    static public boolean isStorable(Object v) {
        return v == null ||
            v instanceof Number ||
            v instanceof String ||
            v instanceof Boolean ||
            v instanceof OffsetDateTime ||
            v instanceof EvalError;
    }

    static public Serializable wrapStorable(Object v) {
        if (v instanceof ArrayNode) {
            return ((ArrayNode) v).toString();
        } else if (v instanceof ObjectNode) {
            return ((ObjectNode) v).toString();
        } else {
            return isStorable(v) ?
                (Serializable) v :
                new EvalError(v.getClass().getSimpleName() + " value not storable");
        }
    }

    static public boolean isArray(Object v) {
        return v != null && v.getClass().isArray();
    }

    static public boolean isArrayOrCollection(Object v) {
        return v != null && (v.getClass().isArray() || v instanceof Collection<?>);
    }

    static public boolean isArrayOrList(Object v) {
        return v != null && (v.getClass().isArray() || v instanceof List<?>);
    }

    @SuppressWarnings("unchecked")
    static public List<Object> toObjectList(Object v) {
        return (List<Object>) v;
    }

    @SuppressWarnings("unchecked")
    static public Collection<Object> toObjectCollection(Object v) {
        return (Collection<Object>) v;
    }
}