valuehelper.java

jsr170接口的java实现。是个apache的开源项目。

/*
 * 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.jackrabbit.value;

import org.apache.jackrabbit.util.Base64;
import org.apache.jackrabbit.util.Text;
import org.apache.jackrabbit.util.TransientFileFactory;

import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.ValueFormatException;
import javax.jcr.ValueFactory;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.FilterInputStream;

/**
 * The <code>ValueHelper</code> class provides several <code>Value</code>
 * related utility methods.
 */
public class ValueHelper {

    /**
     * empty private constructor
     */
    private ValueHelper() {
    }

    /**
     * Same as {@link #convert(String, int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.
     *
     * @param srcValue
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @deprecated Use {@link #convert(String, int, ValueFactory)} instead.
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value convert(String srcValue, int targetType)
            throws ValueFormatException, IllegalArgumentException {
        return convert(srcValue, targetType, ValueFactoryImpl.getInstance());
    }

    /**
     * @param srcValue
     * @param targetType
     * @param factory
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value convert(String srcValue, int targetType, ValueFactory factory)
        throws ValueFormatException, IllegalArgumentException {
        if (srcValue == null) {
            return null;
        } else {
            return factory.createValue(srcValue, targetType);
        }
    }

    /**
     * Same as {@link #convert(InputStream, int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.
     *
     * @param srcValue
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @deprecated Use {@link #convert(InputStream, int, ValueFactory)} instead.
     */
    public static Value convert(InputStream srcValue, int targetType)
            throws ValueFormatException, IllegalArgumentException {
        return convert(srcValue, targetType, ValueFactoryImpl.getInstance());
    }

    /**
     * @param srcValue
     * @param targetType
     * @param factory
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     */
    public static Value convert(InputStream srcValue, int targetType, ValueFactory factory)
        throws ValueFormatException, IllegalArgumentException {
        if (srcValue == null) {
            return null;
        } else {
            return convert(factory.createValue(srcValue), targetType, factory);
        }
    }

    /**
     * Same as {@link #convert(String[], int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.
     *
     * @param srcValues
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @deprecated Use {@link #convert(String[], int, ValueFactory)} instead.
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value[] convert(String[] srcValues, int targetType)
            throws ValueFormatException, IllegalArgumentException {
        return convert(srcValues, targetType, ValueFactoryImpl.getInstance());
    }

    /**
     * Same as {@link #convert(String[], int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.
     *
     * @param srcValues
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value[] convert(String[] srcValues, int targetType, ValueFactory factory)
            throws ValueFormatException, IllegalArgumentException {
        if (srcValues == null) {
            return null;
        }
        Value[] newValues = new Value[srcValues.length];
        for (int i = 0; i < srcValues.length; i++) {
            newValues[i] = convert(srcValues[i], targetType, factory);
        }
        return newValues;
    }

    /**
     * @param srcValues
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value[] convert(InputStream[] srcValues, int targetType,
                                  ValueFactory factory)
            throws ValueFormatException, IllegalArgumentException {
        if (srcValues == null) {
            return null;
        }
        Value[] newValues = new Value[srcValues.length];
        for (int i = 0; i < srcValues.length; i++) {
            newValues[i] = convert(srcValues[i], targetType, factory);
        }
        return newValues;
    }

    /**
     * Same as {@link #convert(Value[], int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.
     *
     * @param srcValues
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @deprecated Use {@link #convert(Value[], int, ValueFactory)} instead.
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value[] convert(Value[] srcValues, int targetType)
        throws ValueFormatException, IllegalArgumentException {
        return convert(srcValues, targetType, ValueFactoryImpl.getInstance());
    }

    /**
     * @param srcValues
     * @param targetType
     * @param factory
     * @throws ValueFormatException
     * @throws IllegalArgumentException
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value[] convert(Value[] srcValues, int targetType,
                                  ValueFactory factory)
            throws ValueFormatException, IllegalArgumentException {
        if (srcValues == null) {
            return null;
        }

        Value[] newValues = new Value[srcValues.length];
        int srcValueType = PropertyType.UNDEFINED;
        for (int i = 0; i < srcValues.length; i++) {
            if (srcValues[i] == null) {
                newValues[i] = null;
                continue;
            }
            // check type of values
            if (srcValueType == PropertyType.UNDEFINED) {
                srcValueType = srcValues[i].getType();
            } else if (srcValueType != srcValues[i].getType()) {
                // inhomogeneous types
                String msg = "inhomogeneous type of values";
                throw new ValueFormatException(msg);
            }

            newValues[i] = convert(srcValues[i], targetType, factory);
        }
        return newValues;
    }

    /**
     * Same as {@link #convert(Value, int, ValueFactory)} using
     * <code>ValueFactoryImpl</code>.

     * @param srcValue
     * @param targetType
     * @throws ValueFormatException
     * @throws IllegalStateException
     * @throws IllegalArgumentException
     * @deprecated Use {@link #convert(Value, int, ValueFactory)} instead.
     * @see #convert(Value, int, ValueFactory)
     */
    public static Value convert(Value srcValue, int targetType)
        throws ValueFormatException, IllegalStateException,
        IllegalArgumentException {
        return convert(srcValue, targetType, ValueFactoryImpl.getInstance());
    }

    /**
     * Converts the given value to a value of the specified target type.
     * The conversion is performed according to the rules described in
     * "6.2.6 Property Type Conversion" in the JSR 170 specification.
     *
     * @param srcValue
     * @param targetType
     * @param factory
     * @throws ValueFormatException
     * @throws IllegalStateException
     * @throws IllegalArgumentException
     */
    public static Value convert(Value srcValue, int targetType, ValueFactory factory)
            throws ValueFormatException, IllegalStateException,
            IllegalArgumentException {
        if (srcValue == null) {
            return null;
        }