com.gitlab.mvysny.konsumexml.Utils.kt Maven / Gradle / Ivy

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Konsume-XML: A simple functional XML parser with no annotations

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package com.gitlab.mvysny.konsumexml

import java.io.Closeable
import javax.xml.namespace.QName

/**
 * Tries to run given block on a [Closeable]. If the block fails, this closable is closed; if the block succeeds,
 * this closeable is not closed since it's expected that the closeable will be used further.
 *
 * Used when the Closeable is closed elsewhere, for example:
 * ```kotlin
 * fun File.buffered(): BufferedInputStream = inputStream().andTry { it.buffered() }
 * ```
 */
public inline fun  T.andTry(block: (T) -> R): R = try {
    block(this)
} catch (e: Exception) {
    try {
        close()
    } catch (ce: Exception) {
        // we don't depend on slf4j so we can't use that;
        // we need to run on older Androids and therefore we can't use Throwable.addSuppressed()
        // JUL is not supported properly on Androids
        // the safest thing is to fall back and call printStackTrace()
        ce.printStackTrace()
    }
    throw e
}

/**
 * Returns the tag name. The tag name is [QName.localPart] but it includes a
 * prefix if not null, for example `atom:link`.
 */
public val QName.tagName: String get() = buildString {
    if (prefix.isNotBlank()) {
        append(prefix)
        append(':')
    }
    append(localPart)
}

/**
 * Formats this QName in the form of `{namespace}prefix:localName`.
 */
public fun QName.getFullName(): String = buildString {
    if (namespaceURI.isNotBlank()) {
        append('{')
        append(namespaceURI)
        append('}')
    }
    append(tagName)
}

public val QName.hasNamespace: Boolean get() = namespaceURI.isNotEmpty()

internal fun existsClass(className: String): Boolean = try {
    Class.forName(className, true, Konsumer::class.java.classLoader)
    true
} catch (e: ClassNotFoundException) {
    false
}