org.apache.pdfbox.cos.COSFloat.java Source code

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Here is the source code for org.apache.pdfbox.cos.COSFloat.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.pdfbox.cos;

import java.io.IOException;
import java.io.OutputStream;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;

/**
 * This class represents a floating point number in a PDF document.
 *
 * @author Ben Litchfield
 * 
 */
public class COSFloat extends COSNumber {
    private BigDecimal value;
    private String valueAsString;

    /**
     * Constructor.
     *
     * @param aFloat The primitive float object that this object wraps.
     */
    public COSFloat(float aFloat) {
        // use a BigDecimal as intermediate state to avoid 
        // a floating point string representation of the float value
        value = new BigDecimal(String.valueOf(aFloat));
        valueAsString = removeNullDigits(value.toPlainString());
    }

    /**
     * Constructor.
     *
     * @param aFloat The primitive float object that this object wraps.
     *
     * @throws IOException If aFloat is not a float.
     */
    public COSFloat(String aFloat) throws IOException {
        try {
            valueAsString = aFloat;
            value = new BigDecimal(valueAsString);
            checkMinMaxValues();
        } catch (NumberFormatException e) {
            if (aFloat.startsWith("--")) {
                // PDFBOX-4289 has --16.33
                valueAsString = aFloat.substring(1);
            } else if (aFloat.matches("^0\\.0*\\-\\d+")) {
                // PDFBOX-2990 has 0.00000-33917698
                // PDFBOX-3369 has 0.00-35095424
                // PDFBOX-3500 has 0.-262
                valueAsString = "-" + valueAsString.replaceFirst("\\-", "");
            } else {
                throw new IOException("Error expected floating point number actual='" + aFloat + "'", e);
            }
            try {
                value = new BigDecimal(valueAsString);
                checkMinMaxValues();
            } catch (NumberFormatException e2) {
                throw new IOException("Error expected floating point number actual='" + aFloat + "'", e2);
            }
        }
    }

    private void checkMinMaxValues() {
        float floatValue = value.floatValue();
        double doubleValue = value.doubleValue();
        boolean valueReplaced = false;
        // check for huge values
        if (Float.isInfinite(floatValue)) {
            if (Math.abs(doubleValue) > Float.MAX_VALUE) {
                floatValue = Float.MAX_VALUE * (Float.compare(floatValue, Float.POSITIVE_INFINITY) == 0 ? 1 : -1);
                valueReplaced = true;
            }
        }
        // check for very small values
        else if (Float.compare(floatValue, 0) == 0 && Double.compare(doubleValue, 0) != 0
                && Math.abs(doubleValue) < Float.MIN_NORMAL) {
            floatValue = Float.MIN_NORMAL;
            floatValue *= doubleValue >= 0 ? 1 : -1;
            valueReplaced = true;
        }
        if (valueReplaced) {
            value = BigDecimal.valueOf(floatValue);
            valueAsString = removeNullDigits(value.toPlainString());
        }
    }

    private String removeNullDigits(String plainStringValue) {
        // remove fraction digit "0" only
        if (plainStringValue.indexOf('.') > -1 && !plainStringValue.endsWith(".0")) {
            while (plainStringValue.endsWith("0") && !plainStringValue.endsWith(".0")) {
                plainStringValue = plainStringValue.substring(0, plainStringValue.length() - 1);
            }
        }
        return plainStringValue;
    }

    /**
     * The value of the float object that this one wraps.
     *
     * @return The value of this object.
     */
    @Override
    public float floatValue() {
        return value.floatValue();
    }

    /**
     * The value of the double object that this one wraps.
     *
     * @return The double of this object.
     */
    @Override
    public double doubleValue() {
        return value.doubleValue();
    }

    /**
     * This will get the long value of this object.
     *
     * @return The long value of this object,
     */
    @Override
    public long longValue() {
        return value.longValue();
    }

    /**
     * This will get the integer value of this object.
     *
     * @return The int value of this object,
     */
    @Override
    public int intValue() {
        return value.intValue();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object o) {
        return o instanceof COSFloat && Float.floatToIntBits(((COSFloat) o).value.floatValue()) == Float
                .floatToIntBits(value.floatValue());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return value.hashCode();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "COSFloat{" + valueAsString + "}";
    }

    /**
     * visitor pattern double dispatch method.
     *
     * @param visitor The object to notify when visiting this object.
     * @return any object, depending on the visitor implementation, or null
     * @throws IOException If an error occurs while visiting this object.
     */
    @Override
    public Object accept(ICOSVisitor visitor) throws IOException {
        return visitor.visitFromFloat(this);
    }

    /**
     * This will output this string as a PDF object.
     *
     * @param output The stream to write to.
     * @throws IOException If there is an error writing to the stream.
     */
    public void writePDF(OutputStream output) throws IOException {
        output.write(valueAsString.getBytes(StandardCharsets.ISO_8859_1));
    }
}